jamesmartin
Well-Known Member
piston would be engine speed tappet half,i had a piston that deformed when hot and would tap
Looking at some exhaust manifold and coolant leakage problems first, when that's solved I'll start her up and record the sound, maybe that helps.
It's definately half engine speed, so it has to be something to do with the valve train. Some more background, the engine's a 4.6 V8 and has done approx 250k km.
I think I can either look at just the rockers first, or replace rockers+arms, cam followers, cam shaft and timing chain (it's probably a good idea to replace the chain anyway at this mileage?)
It's definately half engine speed, so it has to be something to do with the valve train. Some more background, the engine's a 4.6 V8 and has done approx 250k km.
I think I can either look at just the rockers first, or replace rockers+arms, cam followers, cam shaft and timing chain (it's probably a good idea to replace the chain anyway at this mileage?)
Current plan is to leave the heads on for now, and replace camshaft, tappets and rockers
