2007 at the Hammond Barn

[Pete Ashby]

Originally posted by Richard Farrant
Bob,

I use a sealant that was developed by Rolls Royce for their aircraft engines originally, called Wellseal. It is a type of shellac and only needs a very thin coat, then allowed to go off for about 10 mins. when it gets sticky. You set up your shimming first, then strip and apply the sealant between each shim. Experience will tell you how to compensate for it on the shimming, dependant on how many shims are used. If you were using brand new shims, there is often no problem, it is old ones with the odd wrinkle in them, that cause the problems. Re. the remark from your bearing guy about the bolts should pull the shims tight, not always possible if the item has relatively small diameter studs or bolts.

Use the same Richard if required, usually only a problem with re-used dinged shims.

Bob

Don’t feel bad about doing the job twice, it's well worth spending time getting the preload right on the centre transfer gear bearing, get it wrong and it will howl like a banshee on overrun

Pete