CAT C9 Valve lash/Injector height question. Thanks in advance.

[Jimmy Garcia]

Hope everyone is well.  Looking for some clarification for 05 Monterey.  I am coming up on 100k miles (not sure if it has been previously checked) and was researching doing the valve lash check and adjustment.  I was wondering if you could tell me as my research has not been clear do you also have to do anything about injector height adjustments like on the bigger engines?  My understanding is you pin the engine and check which piston is TDC by the rocker arms being loose on 1 vs 6.  if starting on 1 Then intake and exhaust, 2 intake, 3 exhaust, 4 intake, 5 exhaust remove pin.  Rotate 360 repin and reverse piston 6 intake exhaust, 5 intake, 4 exhaust, 3 intake, 2 exhaust. Can you verify torques please. Add new gasket tighten valve cover.  Thanks again.  Hope you have a pleasant day.  Cheers. 

[Dave Atherton]

Hi, want to relate from Caterpillar service manual after 5 tanks of fuel when new check valve lash and
adjustment if needed . This does not state adjustment of all valves, than 150,000 miles check valve lash.
The reason caterpillar is stating check valve lash with electronic 3100 series engines because of incorrect valve adjustment. The correct valve setting is intake valve .015 plus or minus .003  than the exhaust
valve .025 plus or minus .003. What this is telling us that if you can slide a .006 window for valve clearance. Yes I always heard yes all your valves were fine because with the plus/minus clearance is why the long adjustment time between checking valve lash.
In closing sounds like your setup with the engine pin lock but before anything or
change valve setting be sure to understand what I posted above. Tighten a valve like the older non-electronic engines with a slight drag to make sure of tightness measurements.
Correct torque of adjustment nut is extremely important. Dave Atherton Retired Cat Mechanic

[Jimmy Garcia]

Good day Dave,
As always thanks for coming thru with the information.  Say do you know will CAT be able to look up service history on an engine as I am not the original owner and not sure if the valves were every checked?  So for the C9 valve lash check would be at 150K?  Also is there a injector height procedure that should be done when doing the lash check?  Thanks again.  Have a pleasant day.  Cheers.

Hi, want to relate from Caterpillar service manual after 5 tanks of fuel when new check valve lash and
adjustment if needed . This does not state adjustment of all valves, than 150,000 miles check valve lash.
The reason caterpillar is stating check valve lash with electronic 3100 series engines because of incorrect valve adjustment. The correct valve setting is intake valve .015 plus or minus .003  than the exhaust
valve .025 plus or minus .003. What this is telling us that if you can slide a .006 window for valve clearance. Yes I always heard yes all your valves were fine because with the plus/minus clearance is why the long adjustment time between checking valve lash.
In closing sounds like your setup with the engine pin lock but before anything or
change valve setting be sure to understand what I posted above. Tighten a valve like the older non-electronic engines with a slight drag to make sure of tightness measurements.
Correct torque of adjustment nut is extremely important. Dave Atherton Retired Cat Mechanic