Power Driven Stock+ Cylinder Head for 89-98 12v Cummins

General Pre Break-in Instructions:

1.      
When installing a new Colt flat tappet camshaft, we strongly recommend that the cam lobes and lifter faces are coated with a high viscosity extreme pressure assembly lube such as Driven Engine Assembly Grease.  Engine oil, assembly lube, or Driven Engine Assembly Grease can be used to lubricate the camshaft journals, lifter bores, lifter cups, pushrod ends, rocker shafts/trunnions, and rocker arm ball/cup at the valve bridges.     

2.      
For all Cummins applications, 12v 5.9L and 24v 6.7L, we recommend cold intake valve lash is set to 0.010” (0.254mm) and cold
exhaust valve lash is set to 0.020” (0.508mm). For larger than stock camshafts, we recommend the companion cylinder
method for setting valve lash i.e. #6 cylinder in valve overlap to set #1 valve
lash, 2 & 5, 3 & 4.  After initial valve lash setting, it is recommended to rotate the engine one full revolution and then recheck valve lash to ensure that the thick viscosity
assembly grease did not cause an error in valve lash adjustment.

3.      
Fill the engine with a high zinc and phosphorus conventional engine oil with greater than 1,500 ppm ZDDP.  We recommend oils such as: Power Driven 15w-40, Driven DBR 15w-40, Motul 10w-40 Break-In, Amsoil SAE30 Break-In, Valvoline VR1 10w-40, Lucas SAE30 Break-in, etc. 

We do not recommend additives to spike
standard oil for break-in, neither you nor Colt are tribologists or oil chemists.       

Camshaft Break-In

1.      
For first start-up, quickly check for leaks, if
all looks good, immediately proceed to camshaft break-in.

2.      
Run the engine with the vehicle stationary (in park) for 20 minutes maintaining an elevated engine speed between 1,500 and
2,200 RPM.  During break-in, slowly oscillate the RPM between the minimum of 1,500 and maximum of 2,200 RPM.  Camshaft lobes are splash lubricated, elevated engine speed is utilized to increase oil splash to facilitate proper break-in.  RPM oscillation helps to alter the splash zones, tappet rotation speed, and camshaft dynamics.

3.      
After the 20-minute break-in, shut off engine; if this is a new build, we recommend a hot retorque immediately after cam break-in.

4.      
Change the engine oil and filter.  Refill the engine with proper oil for your engine: CI4plus, CJ4, CK4, etc.  Although high zinc oils like PDD 15w-40 are great for flat tappet camshafts and provide an extra boundary layer of protection from the ZDDP, specialty oil may not be compatible long-term with factory emissions equipment.  Special oil is not required for Colt flat tappet camshafts.  

5.      
After the engine has cooled off, check and
verify valve lash.  If this is a new build and you are doing a hot re-torque, complete the hot re-torque before verifying and/or resetting valve lash. 
It is normal for new head gaskets/retorqued heads to compress and tighten up valve lash a few thousandths. 
Conversely, it is normal for new cams, tappets/lifters, pushrod ends, and rocker arms to “break-in” and open up valve lash a few thousandths.