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#830640 11/22/20 6:24 pm
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Mark. L Offline OP
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69 bonneville outer gear box cover, do they use a gasket?

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Mark. L #830648 11/22/20 7:35 pm
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No.


Bruce Miller
aka The Hermit
The Bonnie Ref: https://www.hermit.cc/tmc/om/manual.htm
Hermit #830649 11/22/20 7:42 pm
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Mark. L Offline OP
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Ok, so is anything used to help seal it?

Mark. L #830654 11/22/20 8:25 pm
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1968 T120R
1972 T120RV
Any advice given is without a warranty expressed or implied.
1 member likes this: Hermit
Mark. L #830658 11/22/20 8:42 pm
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Thanks guys!

Mark. L #830661 11/22/20 8:58 pm
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Hi Mark, '69 did not use gasket for inner or outer covers from factory, yet some parts books shows them.

The inner cover locates the clutch in/out position & also controls end play of the gears. If you use gasket on the inner cover you are effectively moving clutch to right which effects primary chain line & giving gears too much side play, plus this can effect the depth of dog engagement of gears. Don't use a gasket on inner cover either.

Outer cover when you use gasket gives more end play to kicker shaft, & shifter shaft. That doesn't help things.

My sealant of choice for both these covers is Loctite 518. Put on dry surfaces it can fill gaps of even .010". Yet it allows you to remove covers later without a fight & can be removed from sealing surfaces without a fight. Trust me, it will no leak when put on dry surfaces. Put on one side only. Not both sides which would give double thickness of 518. That's too much. I use a acid brush from Hardware store & apply light coat with brush marks going long ways on case. Think how a notched adhesive trowel works. Like that. You don't have to assemble quickly, but don't wait hours. Be ready to assemble. Apply sealant & assemble promptly. I let cure 24 hours to be on safe side before adding oil.

Some threads go through to the outside of motor (not blind) it is common for oil to seep along the threads & leak. Put a thin smear of 518 on threads & washer to prevent this seepage. I've been using 518 for 3 years now to perfect results. I don't know how long it will last, but not a trace of seepage so far on a few motors now.
Don


1973 Tiger 750
Mark. L #830763 11/23/20 11:11 am
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+1 for 518, the spec sheet shows that it gets significantly STRONGER when exposed to oil, but not in high temp situations like around the head. It also is more tolerant of surface preparation / contamination.


3D TV: A format that lost a format war without even having an opponent.
Bikes: '69 T120 on average (1967 rolling frame and 1971 Bonnie engine) + '56 1/2 T110 on average (58 rolling frame - with 55 iron head engine) + 74 T150 Home model.
Mark. L #830784 11/23/20 2:44 pm
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Mark. L Offline OP
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I have some 515 loctite here, would that work, or should I get some 518?

Mark. L #830806 11/23/20 8:06 pm
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Hi Mark, 515 will seal perfectly. However it holds strongly. It may be very difficult to separate later some of our aluminum oil pans were sealed with 515. Great care was needed to remove pan without breaking it. Factory didn’t care about disassembly. It was on the dealer.
I would use 518 as it specifically designed for easy separation. Originally for air craft motors to replace silk thread & shellac. Easy damage free separation of cases is a key feature of 518.
Hate to say it but Triumphs need to be taken apart more often than we’d like.
I use 518 for case halves, timing cover to very good results.
518 will seal alloy & copper washers nicely also.
Do not use 518 on gaskets or fiber washers.
Don


1973 Tiger 750
Mark. L #830811 11/23/20 8:30 pm
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Ok, 518 it is then, thanks for the info guys


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