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Technical Support / Re: CAT C9 Valve lash/Injector height question. Thanks in advance.
« Last post by Dave Atherton on September 27, 2023, 07:03:09 PM »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
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