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Gear oil leak 69 441 #741349
07/10/18 12:55 am
07/10/18 12:55 am
Joined: Aug 2012
Posts: 171
washington state
7
79T140E Offline OP
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79T140E  Offline OP
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Joined: Aug 2012
Posts: 171
washington state
I have gear box oil leaking from the gear lever shaft. Why would this be happening and what is the cure? The bike has not and is not running but no too far away from being ready to fire up so I filled the gearbox with the correct (I think) amount of 85w90. I also put oil in the engine oil tank. I tried to compare the oil that is leaking out with a sample from the gear oil and the 20w50 engine oil and I think it is gear oil. Any suggestions would be appreciated.

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Re: Gear oil leak 69 441 [Re: 79T140E] #741388
07/10/18 11:05 am
07/10/18 11:05 am
Joined: Dec 2004
Posts: 9,375
Scotland
kommando Online content
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kommando  Online Content
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Scotland
The gearshaft is unlikely to leak gear oil, the correct gear oil level is lower than the hole in the inner timing cover on center stand or side stand, so it's more likely to be engine oil and your engine is wet sumping, the engine oil once it gets high enough leaks out through a tiny breather hole on the inner timing cover and once the level gets high enough then out through the outer timing cover gearshaft hole which is open to this breathing cavity and not the gearbox. To test this take off the sump plate and see how much oil comes out, a lot means its wet sumped and you need to fix the non return valve in the inner timing cover.

Re: Gear oil leak 69 441 [Re: 79T140E] #741428
07/10/18 8:14 pm
07/10/18 8:14 pm
Joined: Aug 2012
Posts: 171
washington state
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79T140E Offline OP
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Thank you for the info kommando, it's a big help. Thanks

Re: Gear oil leak 69 441 [Re: 79T140E] #741468
07/11/18 4:34 am
07/11/18 4:34 am
Joined: Aug 2012
Posts: 171
washington state
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79T140E Offline OP
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79T140E  Offline OP
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When I took the sump plate off about a quart of oil came out. I am looking at my B44 parts book and I see the 1/4" ball bearing, spring and plug. The Rupert Ratio book gives a good explanation on what to do, guess I know what I am doing this weekend.

Re: Gear oil leak 69 441 [Re: 79T140E] #741476
07/11/18 8:09 am
07/11/18 8:09 am
Joined: Dec 2004
Posts: 9,375
Scotland
kommando Online content
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kommando  Online Content
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Scotland
I get 2 1/4 ball bearings, one to be used to knock the seat into shape which is then discarded and the second for fitting in case the first suffers from being knocked..

Re: Gear oil leak 69 441 [Re: 79T140E] #741510
07/11/18 2:18 pm
07/11/18 2:18 pm
Joined: Aug 2012
Posts: 171
washington state
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79T140E Offline OP
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79T140E  Offline OP
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washington state
Sounds like a good idea kommando. Thanks. While reading RR book I read about a ball bearing in the scavenge tube. So that ball bearing lifts up once the oil pump starts pulling oil up from the sump then it drops back down when the engine stops and this stops the oil in the return line from returning to the sump. Is this correct? so I should be able to put a screwdriver or something up the scavenge pipe and feel the ball bearing?

Re: Gear oil leak 69 441 [Re: 79T140E] #741512
07/11/18 3:19 pm
07/11/18 3:19 pm
Joined: Dec 2004
Posts: 9,375
Scotland
kommando Online content
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kommando  Online Content
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Scotland
Yes, but the oil it holds back is a tiny amount, just the contents of the pipe which ends above the oil level in the tank and so cannot draw on it unlike the feedside. As long as the ball lifts nothing more to be done.

Re: Gear oil leak 69 441 [Re: 79T140E] #741585
07/12/18 4:10 am
07/12/18 4:10 am
Joined: Aug 2012
Posts: 171
washington state
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79T140E Offline OP
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79T140E  Offline OP
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Joined: Aug 2012
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washington state
Uh oh. I take the timing cover off and where the parts manual shows a "plug" I see a socket head bolt with a couple of copper washers. I take the bolt out and nothing. I get the flashlight and I can see in about an inch or so a hole with a chamfered seat. Think I will check the pressure relief valve.

Re: Gear oil leak 69 441 [Re: 79T140E] #741599
07/12/18 7:40 am
07/12/18 7:40 am
Joined: Dec 2004
Posts: 9,375
Scotland
kommando Online content
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kommando  Online Content
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Joined: Dec 2004
Posts: 9,375
Scotland
The socket head is a mod for the B25 where the oil pressure loss was critical and this deals better, sounds like when the mod was done the spring and ball were left out. The pressure release valve is redundant on a B44, as the big end is a roller bearing not a shell bearing there is no back pressure created to release.


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