Hello,
Maybe someone has ideas, how in ~1000km exhaust hydraulic lifter can wear like in these pictures:
Also, camshaft lobe for this lifter is also worn, but I don't have pictures of it. Engine has 16 valves, but only one lifter is worn, other lifters and cam lobes are in good condition. I...
3DDave - yes, machine shop replaced exhaust valve guides and exhaust valves, but intake valve guide seals also popped off, and as far as I know, intake valve guides are still original
Tmoose - it's 2000 Alfa 156. When I was rebuilding engine, I sent cylinder head to machine shop to resurface it and they also changed exhaust valve guides and exhaust valves, they removed old valve stem seals, so now I don't know if they were out of place or not. I used non OEM valve seals...
Hello,
After few hundreds km valve stem seals popped off again. First time I used oil to fit them, second time I installed them dry, because I thought that maybe they popped off because of being lubricated inside. Both times I installed them with socket and they fit pretty easy without too much...
Hello to all,
So, as I planned, I changed valve stem seals without removing cylinder head, almost all of them were not "fully seated" and also found intake manifold gasket oil leak (there is variable valve solenoid on intake manifold), so replaced this gasket also.
Assembled everything as it...
3DDave - how You can see valve stem leakage with compressed air in cylinder if valve is closed? Cylinder head was checked before installation, and there was no leakage between valves and valve seats
3DDave - yes, method with air compressor also should work, but I don't have air compressor in my garage and I don't want to buy it just to use it once for this job
Today I saw video on Youtube and decided to try my luck, when it gets warmer outside, and try to change valve stem seals without removing cylinder head. I think simple method with rope/shoelace inserted in cylinder through spark plug hole with piston at TDC should work just fine, so this way I...
Thank You all for answers, I will try to tear down this engine again in spring and inspect where is the problem. And if I'm lucky, maybe new rings will solve my problem. Also I heard few cases, that on these engines valve stem seals can fly off from valve guide boss, if it's my case, then it...
Tmoose - I assembled this engine, machine shop only bored, honed and cleaned cylinder block, polished crank, also they replaced valve guides and resurfaced cylinder head
Engine block was given to machine shop with new pistons, so they said that cylinders were bored to exactly match new pistons size, and all engine was cleaned by them before and after boring and honing. I didn't ask them about clearances, because they anyway done boring to match new pistons and...
Maybe there will be some other things, that causes oil consumption, but if cylinders were honed only few thousand km ago and there is no damage to cylinder walls, is it really necessary to hone again if replacing rings? Or new rings can seat only on freshly honed cylinders?
Hello,
Half year in weekends I was rebuilding my old Alfa Romeo engine. Cylinders were re-bored and honed, new larger pistons with new rings installed, main and conrod bearings replaced, new valves, valve guides, valve stem seals installed, all other seals and gaskets replaced. And, as it was...
