Topic: Engine case bolts, oil leak - washers ?

[greenjeans]

73 CB750K

Leaking oil from 1 or more of the engine case bolts.   At some point the cases were split by the PO.   But, since this thing purrs better/quieter than any other CB I have ever owned, I am reluctant to split them again to reseal.   The oil pan has a new gasket and is dry.   A couple of threads mentioned adding some aluminum crush washers to the engine case bolts.

That brings 2 questions to my feeble mind:

   1.  I was planning on replacing 1 at a time and torquing.  What would the crush washers do to the torque values ?
   2.  What size are those washers - the bolts and their size isn't showing up on the parts fische.   I'm guessing 10mm ? or are they 8's  ?

[MCRider]

I have this problem too. I've been told a fix by a builder here.

IMO: The crush washers won't do anything to the torque value. It will just crush. Just like the Fs and many other models that have hardened washers on some head studs and copper washers on head studs that carry oil.

The lower case studs/main bearing studs are 8mm.
What has happened is that the sealer was not appied on the main bearing saddles up to nearly the main bearing studs. Oil is allowed to wick down the studs (I have studs, you have bolts, same dif) and sneak out past the hardened washers.

I am going to try some copper washers, I bot off eBay. Try putting a little non--hardening sealer on your bolt threads, give it 10 minutes to firm up, then reinsert. Then also put non-hardening (Gasgacinch is my fav) on the bolt heads and on your crush washers, let set, then finish up.

Good luck. You get done before me let us know how it works.

[greenjeans]

Update:  Found some copper washers and added a tiny bit of sealant.   Leaks are gone.  Thanks.

[MCRider]

Update:  Found some copper washers and added a tiny bit of sealant.   Leaks are gone.  Thanks.

Same here it seems. Thank Mike, from who(m?) I got the tip.

[Jerry Rxman Griffin aka MuthaF'er]

Which bolts are you referring to?

[rotortiller]

Stato-seals would work.