Engine Break In Procedure

1998-2024 Precision Plus and Essential Long blocks

Thank you for your purchase of your new D&J Precision Machine Engine. We have created this break in procedure to ensure optimum performance of your new engine.

Every engine comes pre-lubed with 12 quarts of VR1 20W-50 race oil and a filter. We have found this oil works very well with break in.Your engine has been pressure-checked for oil and crankcase leaks. It has also been pressure checked for coolant leaks. Your engine is ready to start putting on your accessories, wiring harness, turbo, and fuel system. There are a few steps we recommend for proper break in.

Step 1: Install engine in truck. Only hook up fuel system, transmission, turbo with oil supply and return, all electrical plug-ins to run the engine. Install radiator and intercooler piping. Do not fill the radiator at this time.  Install an external mechanical oil pressure gauge, crank the engine with the injectors unplugged, and fuel supply pump off (this helps not to build rail pressure and add more load to the starter) until you start to get oil pressure.  Be careful not to overheat your starter; it may take a few minutes to get oil pressure.   Plug everything in and clear codes.

Step 2: Start the engine with no coolant in it. After the engine is running and reading good oil pressure you are going to increase engine RPM to 1,800 rpm and hold it steady for five minutes. Try not to let the engine idle more than necessary. We have found it causes piston rings to glaze and hinders camshaft break in. There will be a little oil residue coming from the exhaust side of the turbo or smoke out the tailpipe depending if your downpipe is hooked up. This is normal. The oil that is used in assembly is burning off or working its way out of the combustion chamber.  It is a good idea to have a friend watch for leaks.

Step 3: After the five minutes run time is complete you can shut off the engine and check for any leaks. This is a good time to make sure all fuel lines are tight and look for any issue with turbo oil lines. If everything looks good, let the engine cool, and fill the engine with coolant. We recommend leaving the heater core hose off the top of the cylinder head as you are filling the radiator with coolant. This allows air to escape the engine as you are filling it. This also allows the cylinder head to be completely filled with coolant and not have any air trapped in the coolant passages. As you are filling the radiator, watch the fitting for coolant. When the coolant starts to come out of the fitting, install the hose, tighten the clamp. Finish filling the radiator. 

Step 4: After the engine is filled with coolant, a 20 minute run at 1,800 rpm can be done. Once again do not let the engine idle for an excessive amount of time. This helps in bringing the engine up to temperature. We recommend stopping every five to ten minutes and checking for leaks or other issues if you are working by yourself. The engine can be left running during these checks. After the 20 minute run, shut off the engine. 

Step 5: Drain oil and change the filter. A hot re-torque can be done at this time. Remove valve cover, injector wiring harness and rocker box. Intake rockers will also need to be removed at this time to re-torque head studs. We recommend removing intake rockers on the stud being tightened then replaced after torquing to help with checking valve lash in the next step. D&J head studs are re-torqued to 125 ft. lbs starting in the center of the engine and working out towards the ends alternating from side to side.   After re-torque intake rockers can be torqued to 26ft/lbs.

This Privacy Policy governs the manner in which D&J Precision Machine collects, uses, maintains and discloses information collected from users (each, a “User”) of the djprecisionmachine.com website (“Site”). This privacy policy applies to the Site and all products and services offered by D&J Precision Machine.

Personal identification information

We may collect personal identification information from Users in a variety of ways, including, but not limited to, when Users visit our site, register on the site, place an order, subscribe to the newsletter, fill out a form, and in connection with other activities, services, features or resources we make available on our Site. Users may be asked for, as appropriate, name, email address, mailing address, phone number, credit card information. Users may, however, visit our Site anonymously. We will collect personal identification information from Users only if they voluntarily submit such information to us. Users can always refuse to supply personally identification information, except that it may prevent them from engaging in certain Site related activities.

Non-personal identification information

We may collect non-personal identification information about Users whenever they interact with our Site. Non-personal identification information may include the browser name, the type of computer and technical information about Users means of connection to our Site, such as the operating system and the Internet service providers utilized and other similar information.

Web browser cookies

Our Site may use “cookies” to enhance User experience. User’s web browser places cookies on their hard drive for record-keeping purposes and sometimes to track information about them. User may choose to set their web browser to refuse cookies, or to alert you when cookies are being sent. If they do so, note that some parts of the Site may not function properly.

How we use collected information

D&J Precision Machine may collect and use Users personal information for the following purposes:

• – To improve customer service
  Information you provide helps us respond to your customer service requests and support needs more efficiently.
• – To personalize user experience
  We may use information in the aggregate to understand how our Users as a group use the services and resources provided on our Site.
• – To improve our Site
  We may use feedback you provide to improve our products and services.
• – To process payments
  We may use the information Users provide about themselves when placing an order only to provide service to that order. We do not share this information with outside parties except to the extent necessary to provide the service.
• – To run a promotion, contest, survey or other Site feature
  To send Users information they agreed to receive about topics we think will be of interest to them.
• – To send periodic emails
  We may use the email address to send User information and updates pertaining to their order. It may also be used to respond to their inquiries, questions, and/or other requests. If User decides to opt-in to our mailing list, they will receive emails that may include company news, updates, related product or service information, etc. If at any time the User would like to unsubscribe from receiving future emails, we include detailed unsubscribe instructions at the bottom of each email or User may contact us via our Site.

How we protect your information

We adopt appropriate data collection, storage and processing practices and security measures to protect against unauthorized access, alteration, disclosure or destruction of your personal information, username, password, transaction information and data stored on our Site.

Sensitive and private data exchange between the Site and its Users happens over a SSL secured communication channel and is encrypted and protected with digital signatures. Our Site is also in compliance with PCI vulnerability standards in order to create as secure of an environment as possible for Users.

Sharing your personal information

We do not sell, trade, or rent Users personal identification information to others. We may share generic aggregated demographic information not linked to any personal identification information regarding visitors and users with our business partners, trusted affiliates and advertisers for the purposes outlined above.We may use third party service providers to help us operate our business and the Site or administer activities on our behalf, such as sending out newsletters or surveys. We may share your information with these third parties for those limited purposes provided that you have given us your permission.

Changes to this privacy policy

D&J Precision Machine has the discretion to update this privacy policy at any time. When we do, we will revise the updated date at the bottom of this page. We encourage Users to frequently check this page for any changes to stay informed about how we are helping to protect the personal information we collect. You acknowledge and agree that it is your responsibility to review this privacy policy periodically and become aware of modifications.

Your acceptance of these terms

By using this Site, you signify your acceptance of this policy. If you do not agree to this policy, please do not use our Site. Your continued use of the Site following the posting of changes to this policy will be deemed your acceptance of those changes.

Contacting us

If you have any questions about this Privacy Policy, the practices of this site, or your dealings with this site, please contact us at:
D&J Precision Machine
706 Woodlawn Avenue Cambridge, OH 43725
(740) 297-7223
info@djprecisionmachine.com

This document was last updated on May 10, 2016

Step 6: We also recommend rechecking valve lash at this time. Valve lash needs to be checked at top dead center on number one or number six cylinder. Bring the top dead center mark on the harmonic balancer to the 12:00 o'clock position. If both number one cylinder rocker levers are loose, continue to the next step. If both number one cylinder rocker levers are not loose, rotate the crankshaft 360 degrees.
With the engine in this position, valve lash can be measured at the following rocker arms: INTAKE 1-2-4 / EXHAUST 1-3-5  . Measure the valve lash by inserting a feeler gauge between the rocker arm socket and crosshead. Valve lash should be .010” on intake and .020” on exhaust. If the measurement falls within  the limits, adjustment/resetting is not necessary. If measurement finds the lash outside  of the limits, adjustment/resetting is required.

 If adjustment/resetting is required, loosen the lock nut on rocker arms and turn the adjusting screw until the desired lash is obtained. Tighten the lock nut to 24 Nm (18 ft. lbs.) and re-check the valve lash. Using the crankshaft barring tool, rotate the crankshaft   one revolution (360°) to align the damper TDC mark to the 12 o'clock position. With the engine in this position, valve lash can be measured at the remaining rocker arms: INTAKE 3-5-6 / EXHAUST 2-4-6  . Use the same method as above for determining whether valve adjustment is necessary, and adjust those that are found to be outside of the limits.

  If everything checks out you can reinstall rocker box, injector harness, and valve cover.

Step 7: Re-fill engine with oil. We recommend using Hot Shot Secret Green or Blue Diamond full synthetic 15w-40. We have seen good results with these oils. We recommend changing your oil based on usage and horsepower. The more horsepower means more frequent oil change intervals. We have seen oil quality can affect the amount of blow-by an engine can have and ring retention.  Always check engine oil level and also for how clean the oil is. If the oil stains your skin black then it is overdue to be changed. This means the oil is full of soot from combustion and is not going to be as effective in lubricating or cleaning.

These seven steps should ensure a proper break in procedure for your new engine. If you have any further questions, don’t hesitate to call. We will be happy to answer any questions you might have. Thank  you for your purchase.

Engine Break In Procedure

2003-2024 Heavy Hauler, Street Performance, Performance Series, Predator, and Enforcer

Thank you for your purchase of your new D&J Precision Machine Engine. We have created this break in procedure to ensure optimum performance of your new engine.

Every engine comes pre-lubed with 12 quarts of VR1 20W-50 race oil and a filter. We have found this oil works very well with break in.Your engine has been pressure checked for oil and crankcase leaks. It has also been pressure checked for coolant leaks. Your engine is ready to start putting on your accessories, wiring harness, turbo, and fuel system. There are a few steps we recommend for proper break in.

Step 1: Install engine in truck. Only hook up fuel system, transmission, turbo with oil supply and return, all electrical plug-ins to run the engine. Install radiator and intercooler piping. Do not fill the radiator at this time.  Install an external mechanical oil pressure gauge, crank the engine with the injectors unplugged, and fuel supply pump off (this helps not to build rail pressure and add more load to the starter) until you start to get oil pressure.  Be careful not to overheat your starter; it may take a few minutes to get oil pressure.   Plug everything in and clear codes.

Step 2: Start the engine with no coolant in it. After the engine is running and reading good oil pressure you are going to increase engine RPM to 1,800 rpm and hold it steady for five minutes. Try not to let the engine idle more than necessary. We have found it causes piston rings to glaze and hinders camshaft break in. There will be a little oil residue coming from the exhaust side of the turbo or smoke out the tailpipe depending if your downpipe is hooked up. This is normal. The oil that is used in assembly is burning off or working its way out of the combustion chamber.  It is a good idea to have a friend watch for leaks.

Step 3: After the five minutes run time is complete you can shut off the engine and check for any leaks. This is a good time to make sure all fuel lines are tight and look for any issue with turbo oil lines. If everything looks good, let the engine cool, and fill the engine with coolant. We recommend leaving the heater core hose off the top of the cylinder head as you are filling the radiator with coolant. This allows air to escape the engine as you are filling it. This also allows the cylinder head to be completely filled with coolant and not have any air trapped in the coolant passages. As you are filling the radiator, watch the fitting for coolant. When the coolant starts to come out of the fitting, install the hose, tighten the clamp. Finish filling the radiator. 

Step 4: After the engine is filled with coolant, a 20 minute run at 1,800 rpm can be done. Once again do not let the engine idle for an excessive amount of time. This helps in bringing the engine up to temperature. We recommend stopping every five to ten minutes and checking for leaks or other issues if you are working by yourself. The engine can be left running during these checks. After the 20 minute run, shut off the engine. 

Step 5: Drain oil and change the filter. A hot re-torque can be done at this time. Remove valve cover, injector wiring harness and rocker box. Intake rockers will also need to be removed at this time to re-torque head studs. We recommend removing intake rockers on the stud being tightened then replaced after torquing to help with checking valve lash in the next step. D&J 9/16” head studs are re-torqued to 175 ft. lbs starting in the center of the engine and working out towards the ends alternating from side to side.  If your engine has been built with a different stud use their torque spec.  After re-torque intake rockers can be torqued to 26ft/lbs.

This Privacy Policy governs the manner in which D&J Precision Machine collects, uses, maintains and discloses information collected from users (each, a “User”) of the djprecisionmachine.com website (“Site”). This privacy policy applies to the Site and all products and services offered by D&J Precision Machine.

Personal identification information

We may collect personal identification information from Users in a variety of ways, including, but not limited to, when Users visit our site, register on the site, place an order, subscribe to the newsletter, fill out a form, and in connection with other activities, services, features or resources we make available on our Site. Users may be asked for, as appropriate, name, email address, mailing address, phone number, credit card information. Users may, however, visit our Site anonymously. We will collect personal identification information from Users only if they voluntarily submit such information to us. Users can always refuse to supply personally identification information, except that it may prevent them from engaging in certain Site related activities.

Non-personal identification information

We may collect non-personal identification information about Users whenever they interact with our Site. Non-personal identification information may include the browser name, the type of computer and technical information about Users means of connection to our Site, such as the operating system and the Internet service providers utilized and other similar information.

Web browser cookies

Our Site may use “cookies” to enhance User experience. User’s web browser places cookies on their hard drive for record-keeping purposes and sometimes to track information about them. User may choose to set their web browser to refuse cookies, or to alert you when cookies are being sent. If they do so, note that some parts of the Site may not function properly.

How we use collected information

D&J Precision Machine may collect and use Users personal information for the following purposes:

• – To improve customer service
  Information you provide helps us respond to your customer service requests and support needs more efficiently.
• – To personalize user experience
  We may use information in the aggregate to understand how our Users as a group use the services and resources provided on our Site.
• – To improve our Site
  We may use feedback you provide to improve our products and services.
• – To process payments
  We may use the information Users provide about themselves when placing an order only to provide service to that order. We do not share this information with outside parties except to the extent necessary to provide the service.
• – To run a promotion, contest, survey or other Site feature
  To send Users information they agreed to receive about topics we think will be of interest to them.
• – To send periodic emails
  We may use the email address to send User information and updates pertaining to their order. It may also be used to respond to their inquiries, questions, and/or other requests. If User decides to opt-in to our mailing list, they will receive emails that may include company news, updates, related product or service information, etc. If at any time the User would like to unsubscribe from receiving future emails, we include detailed unsubscribe instructions at the bottom of each email or User may contact us via our Site.

How we protect your information

We adopt appropriate data collection, storage and processing practices and security measures to protect against unauthorized access, alteration, disclosure or destruction of your personal information, username, password, transaction information and data stored on our Site.

Sensitive and private data exchange between the Site and its Users happens over a SSL secured communication channel and is encrypted and protected with digital signatures. Our Site is also in compliance with PCI vulnerability standards in order to create as secure of an environment as possible for Users.

Sharing your personal information

We do not sell, trade, or rent Users personal identification information to others. We may share generic aggregated demographic information not linked to any personal identification information regarding visitors and users with our business partners, trusted affiliates and advertisers for the purposes outlined above.We may use third party service providers to help us operate our business and the Site or administer activities on our behalf, such as sending out newsletters or surveys. We may share your information with these third parties for those limited purposes provided that you have given us your permission.

Changes to this privacy policy

D&J Precision Machine has the discretion to update this privacy policy at any time. When we do, we will revise the updated date at the bottom of this page. We encourage Users to frequently check this page for any changes to stay informed about how we are helping to protect the personal information we collect. You acknowledge and agree that it is your responsibility to review this privacy policy periodically and become aware of modifications.

Your acceptance of these terms

By using this Site, you signify your acceptance of this policy. If you do not agree to this policy, please do not use our Site. Your continued use of the Site following the posting of changes to this policy will be deemed your acceptance of those changes.

Contacting us

If you have any questions about this Privacy Policy, the practices of this site, or your dealings with this site, please contact us at:
D&J Precision Machine
706 Woodlawn Avenue Cambridge, OH 43725
(740) 297-7223
info@djprecisionmachine.com

This document was last updated on May 10, 2016

Step 6: We also recommend rechecking valve lash at this time. Valve lash needs to be checked at top dead center on number one or number six cylinder. Bring the top dead center mark on the harmonic balancer to the 12:00 o'clock position. If both number one cylinder rocker levers are loose, continue to the next step. If both number one cylinder rocker levers are not loose, rotate the crankshaft 360 degrees.
With the engine in this position, valve lash can be measured at the following rocker arms: INTAKE 1-2-4 / EXHAUST 1-3-5  . Measure the valve lash by inserting a feeler gauge between the rocker arm socket and crosshead. Valve lash should be .010” on intake and .020” on exhaust. If the measurement falls within  the limits, adjustment/resetting is not necessary. If measurement finds the lash outside  of the limits, adjustment/resetting is required.

 If adjustment/resetting is required, loosen the lock nut on rocker arms and turn the adjusting screw until the desired lash is obtained. Tighten the lock nut to 24 Nm (18 ft. lbs.) and re-check the valve lash. Using the crankshaft barring tool, rotate the crankshaft   one revolution (360°) to align the damper TDC mark to the 12 o'clock position. With the engine in this position, valve lash can be measured at the remaining rocker arms: INTAKE 3-5-6 / EXHAUST 2-4-6  . Use the same method as above for determining whether valve adjustment is necessary, and adjust those that are found to be outside of the limits.

  If everything checks out you can reinstall rocker box, injector harness, and valve cover.

Step 7: Re-fill engine with oil. We recommend using Hot Shot Secret Blue Diamond full synthetic 15w-40, Black Diamond Outlaw Full Synthetic (non emissions trucks), or Hot Shot’s Secret Adrenaline R4 Full Synthetic (race vehicles) . We have seen good results with these oils. We recommend changing your oil based on usage and horsepower. The more horsepower means more frequent oil change intervals. We have seen oil quality can affect the amount of blow-by an engine can have and ring retention.  Always check engine oil level and also for how clean the oil is. If the oil stains your skin black then it is overdue to be changed. This means the oil is full of soot from combustion and is not going to be as effective in lubricating or cleaning.

These seven steps should ensure a proper break in procedure for your new engine. If you have any further questions, don’t hesitate to call. We will be happy to answer any questions you might have. Thank  you for your purchase.