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Old 04-10-2012, 01:34 PM
osvaldo osvaldo is offline
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Thrust bearing ?

My Atomic 4 is a direct drive engine. When I switch it to forward it makes a strong grinding noice. In neutral or reverse it does not. Could this be a defective thrust bearing? Is there a way to tell if the bearing is deffective?

Last edited by osvaldo; 04-13-2012 at 12:51 PM.
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Old 04-14-2012, 03:10 PM
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Al Schober Al Schober is offline
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Well, the sure fire way to tell is to replace the bearing. If the noise goes away, you know the old one is bad.
Other than the bearing, well... Any chance you dropped something in the transmission case that's rubbing on the outside of the cluster? The cluster rotates in forward, but not in neutral or reverse. Do you see any rub marks on the outside of the cluster?
If it only grinds while shifting but not when in forward, it's probably the bearing on the shifter.

Last edited by Al Schober; 04-14-2012 at 03:13 PM.
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Old 04-14-2012, 06:24 PM
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Dromo Dromo is offline
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The first thing I would do, if you dont have a reduction gear.
Try crabbing the shaft coulping and try moving it back & forth to see if there is any play in the shaft/ thrust bearing . You should'nt have any.
Also check for oil around the retaining flang oil seal
I dont know if this test would work with a reduction gear assembly .
Cheers Rick

Last edited by Dromo; 04-14-2012 at 11:19 PM.
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Old 04-15-2012, 07:35 AM
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hanleyclifford hanleyclifford is offline
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Another thing to check is the pilot bearing. Remove the gearbox cover and try wiggling the drum.
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Old 04-15-2012, 11:58 AM
ArtJ ArtJ is offline
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Have you tried the adjustment procedure?
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