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Those flakes just beneath the bolt head in your picture; are they loose? If those and others like them are loose inside your engine that would be cause for concern.
440bb 40psi cyl6 not firing help!!
- Thread starter TruckManiaMike
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TruckManiaMike
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Crust flakes that fell from old valve cover cork gasket. Driver valve cover won’t come off! Either got to move the motor or the brake booster
TruckManiaMike
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Pic^
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Put it back on at the front, slide it forward then tip the other way or roll up. The only rocker I had to unbolt a motor for was a 70's straight six Rambler.
TruckManiaMike
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Just tried, no luck….brake booster coming out..
TruckManiaMike
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Removed brake booster and got the cover off. Found these shims between the rocker shaft and the head. Why would that be there? doesn’t look right
TruckManiaMike
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Pulled the lifter out with a magnet, inspected, looked good to me, re-inserted. Cam lobe looked good. Got pics
Someone was trying to correct the valve train geometry.
Even if the cam is wore down to the base circle the pushrod shouldn't just pop out.
Likely it was never installed correctly.
TruckManiaMike
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Should I just throw it all back together with the shims and see how she acts? What about the low cyl pressure in #3 anything I can do to diagnose while covers are off? I am done working on it for the night! Will continue tomorrow, thanks everyone
You can put a tablespoon of oil in #3 and redo the compression test but from the sound of it it's likely a valve leaking.
It may clear up after running it otherwise the head needs to come off. It won't make much power at 90 psi.
It may clear up after running it otherwise the head needs to come off. It won't make much power at 90 psi.
You can. Then with the covers off just crank it for a while and watch every rocker. If it all looks ok put the covers on and run it.
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I think I would have moved the throttle linkage and kick down before I moved the booster, and flipped the cover the other way......
TruckManiaMike
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I tried moving the linkage before moving booster…. No go…
TruckManiaMike
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Anything I should be looking for while observing rockers?
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Lack of movement, or not as much as the others.
Just that they are opening and closing the valves correctly.
It's all alluding to a possible stuck valve, pushrod fell out, lifter popped up. Side benefit; the other bad cylinder has stuck valve issues. Pull both rocker shish kabobs and check valve heights with a straight edge
TruckManiaMike
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Will do when I get home this afternoon….might I add that this truck had sat for about 4-5 years without running.
The lifter plunger may have leaked down. On start up there could be enough clearance to allow the pushrod to come out. How long had the engine been setting since run?
Doug
Doug
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