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healeynut
Jedi Knight
Offline
Hi -
The head and motor for my A90 is running and back together. The motor is identical to the BN1 and BN2 except it only uses one valve spring.
Anyway, we replaced the inlet valves while it was all apart but the guides were fine. Put it all back together with the only change putting top hat seals on the valve. We replaced the exhaust guides & valves and have no problems with them.
The problem: the car runs fine and warms up fine, but after running, stop the engine, then let the whole business cool down, the inlet valves will stick open (we think only the ones that are down when the engine is switched off). A little tapping with a mallot or pulling with pliers and they are free.
Is it being caused by:
1) The top hat seals not allowing enough lubrication? Shall I remove them and just use the o rings?
2) The old single valve springs aren't strong enough shall I put 3000 double valve springs on them?
3) Should I replace the inlet guides too (I'd rather not take the head off again). The inlet guides look like steel but maybe the PO put annoying bronze ones on there? Ideas?
Help!
The head and motor for my A90 is running and back together. The motor is identical to the BN1 and BN2 except it only uses one valve spring.
Anyway, we replaced the inlet valves while it was all apart but the guides were fine. Put it all back together with the only change putting top hat seals on the valve. We replaced the exhaust guides & valves and have no problems with them.
The problem: the car runs fine and warms up fine, but after running, stop the engine, then let the whole business cool down, the inlet valves will stick open (we think only the ones that are down when the engine is switched off). A little tapping with a mallot or pulling with pliers and they are free.
Is it being caused by:
1) The top hat seals not allowing enough lubrication? Shall I remove them and just use the o rings?
2) The old single valve springs aren't strong enough shall I put 3000 double valve springs on them?
3) Should I replace the inlet guides too (I'd rather not take the head off again). The inlet guides look like steel but maybe the PO put annoying bronze ones on there? Ideas?
Help!
