1977 R100 oil leak

TIMRFO · May 4, 2009

I have a 1977 R100 and on the left cylinder its starting to seep a little oil between the block and cylinder , it that normal? it doesn't leave drips on the gound. Tim

Bill Burke · May 4, 2009

Normal. The block/jug joint can be resealed, and should be done at the same time that you install new pushrod seals. So wait until your pushrod seals start leaking. I've had very good results with Yamabond grey sealant.

RandyB · May 4, 2009

Wander over to airheads.org and read the various tech articles. There is danger in too much sealant. I was amazed at how little it took.

mymindsok · May 4, 2009

Yep!

You can clean the bases and base shims, add a little smear of sealent and it should stop the seeping.

It also helps tp keep your studs torqued to spec. The jugs usually begin leaking after the bolts on the studs get a little loose. Once they begin leaking, sometimes torquing them stops the seepage, sometimes not.

44006 · May 5, 2009

.............."It also helps tp keep your studs torqued to spec. ".................

Resist the temptation to stop this minor leaking by torquing or overtorquing
the long studs that pass through the cyl and heads. It is quite easy to
strip these studs out of the block and if you do not know what the PO may
have done before you never mess with them for something as trivial as
minor seeping. spray can engine cleaner from WMT about $1.50 will keep
this area clean for a year/can.

crazydrummerdude · May 5, 2009

44006 said:
never mess with ... something as trivial as
minor seeping.

That's my philosophy for the whole bike. Haha.

RandyB · May 5, 2009

crazydrummerdude said:
That's my philosophy for the whole bike. Haha.

The Airheads List had a bit on this. They recommended Gunk and water, twice a year....

1977 R100 oil leak

TIMRFO

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Bill Burke

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RandyB

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