CM-871 Overhead...

[Hammerhead]

(10-21-2017 )ktbtrucking Wrote:  When I made it first time and it is really difficult to put feeler gauge between crosshead and rocker. I had to wobble crosshead a little to get a chance to put feeler gauge. Like oil sticks those two parts together and also tried smaller fillers with .

^^^the bold part!
DO NOT PANIC!!!
You will have a very difficult time attempting to get a 0.014" intake or 0.027 exhaust in before you set the valves on an overhead, and you should!
The why is simple, there will always be a small amount of wear of the valves, seats, crossheads, rocker shafts, rockers, etc. it's inevitable. Also, the engine has been lubricating itself, so there is an oil film that takes up several thou of clearance, making getting the "correct feeler" in damn near impossible even on a recently set overhead, never mind a run in one, so relax, this is NORMAL. In fact, I'd say it should be expected, because if you can get the correct feelers in before you do your overhead, it was arguably set too loose! Unless you're a nerd like me who sets his every 6 months...

This is exactly why I release the jam nuts, back out the adjuster, insert the correct feeler, and compress then release each adjuster 3 times before I do the actual final adjustment. This ensures the oil film has been compressed out of the components to get a correct adjustment. If you don't do this, you are setting the clearance plus a cold oil film, and we all know once the oil heats up it thins out, thus increasing your clearances from the proper setting.

Yes #6 should have one compressed (intake) & one released (exhaust) valve when setting #1 and vice versa. Number 6 is opposite #1, as is 5 & 2, as well as 3 & 4.
The adjustment is made at the end of the injection cycle during the power stroke. This is so the injector is at the end of injection cycle to be in the correct position to adjust the pre-load with no fuel interference, and of course because it's also the power stroke, both valves are closed and can be adjusted. While #1 piston is being forced down for power stroke, #6 is on the intake stroke and so on...

Remember, I said don't hesitate to call me if you need to...