Re: Bevel Gears Binding
Posted: Sat Jul 24, 2010 1:05 am
By: matzb...
" With the head and cam tower removed, I can turn the crankshaft with a socket continously and the gears seem to mesh fine. When I put the head and cam tower back on and tork the head bolts , I get the binding that I was talking about previously ( after 8 or 9 full revolutions of the crankshaft . "
____ Previously it had not occurred to me that you would've indicated your binding-issue was seemingly due to just the LOWER bevel-pair, while the cyl.head was still left installed & to be suspected.
Now that you've seemingly found that the tower-shaft/cyl.head is the likely location of your binding-issue, it's still a seemingly strange occurrence to have encountered !
How exactly did you run-into this binding-issue? _ What were you doing when you discovered it for the first time?
__ I would've suspected that the cyl.head has been installed out-of-time with the crankshaft (by an amount that allows the piston to make contact with one of the valves), if you hadn't been able to turn the crankshaft more than just two turns. _ But in this case of yours, I'd first suspect that the bearing for the upper tower-shaft has gone-bad, (assuming that all the teeth on the upper bevel-pair are still good!).
__ Rather than tackle your issue with the overwhelming shot-gun approach as has already been suggested by 'bevel-bob' - (although definitely not to imply that any of his suggestions should not be tried-out anyway, regardless of first solving your issue !),
if your upper bevel-bearing checks-out to be perfectly good, then remove one rocker-arm at a time and check to see if your binding-issue goes away, after each change you make. - (You should be able to do so with the cyl.head off the engine.) _ And if your binding-issue still remains after both rockers have been removed, I'd then only suspect that the right-side cam-bearing has gone bad & allows a lock-up situation to occur.
" I just noticed some small metal chips laying in the bottom of the case from the horizontal bevel gear. "
____ You mean the driven bevel-gear down within the motor-case?
How is it that you NOW seem to be sure that chips have been broken from that particular bevel-gear?
At this point, it would seem more likely that the upper bevel-pair would have some chipped-teeth (to find the pieces of, and also possibly get jammed between teeth).
__ It seems that you need to closely inspect all the teeth of both bevel-pairs, to make sure that they are all as perfect as those of an original set, and that no tiny pieces (of anything) are getting between any of those bevel-teeth.
____ Please keep us updated !
Hopeful-Cheers,
-Bob
" With the head and cam tower removed, I can turn the crankshaft with a socket continously and the gears seem to mesh fine. When I put the head and cam tower back on and tork the head bolts , I get the binding that I was talking about previously ( after 8 or 9 full revolutions of the crankshaft . "
____ Previously it had not occurred to me that you would've indicated your binding-issue was seemingly due to just the LOWER bevel-pair, while the cyl.head was still left installed & to be suspected.
Now that you've seemingly found that the tower-shaft/cyl.head is the likely location of your binding-issue, it's still a seemingly strange occurrence to have encountered !
How exactly did you run-into this binding-issue? _ What were you doing when you discovered it for the first time?
__ I would've suspected that the cyl.head has been installed out-of-time with the crankshaft (by an amount that allows the piston to make contact with one of the valves), if you hadn't been able to turn the crankshaft more than just two turns. _ But in this case of yours, I'd first suspect that the bearing for the upper tower-shaft has gone-bad, (assuming that all the teeth on the upper bevel-pair are still good!).
__ Rather than tackle your issue with the overwhelming shot-gun approach as has already been suggested by 'bevel-bob' - (although definitely not to imply that any of his suggestions should not be tried-out anyway, regardless of first solving your issue !),
if your upper bevel-bearing checks-out to be perfectly good, then remove one rocker-arm at a time and check to see if your binding-issue goes away, after each change you make. - (You should be able to do so with the cyl.head off the engine.) _ And if your binding-issue still remains after both rockers have been removed, I'd then only suspect that the right-side cam-bearing has gone bad & allows a lock-up situation to occur.
" I just noticed some small metal chips laying in the bottom of the case from the horizontal bevel gear. "
____ You mean the driven bevel-gear down within the motor-case?
How is it that you NOW seem to be sure that chips have been broken from that particular bevel-gear?
At this point, it would seem more likely that the upper bevel-pair would have some chipped-teeth (to find the pieces of, and also possibly get jammed between teeth).
__ It seems that you need to closely inspect all the teeth of both bevel-pairs, to make sure that they are all as perfect as those of an original set, and that no tiny pieces (of anything) are getting between any of those bevel-teeth.
____ Please keep us updated !
Hopeful-Cheers,
-Bob