Joe Curry wrote:
> Many of the earlier engines had those spirals in the rear of the
> crankshaft. And it is correct that the motion of the crank pulls air
> from the rear of the engine through that channel keeping a positive
> suction on the rear of the engine and the oil inside (no mention here of
> other oil leaks).
> Here is my experience with oil seals inserted in that type engine. The
> engine in question is a 1147 cc Mk2 Spitfire engine (My son's). When he
> bought the car, it literally poured oil out the back end. Taking it
> apart revealed that some dpo had installed a makeshift later type oil
> seal in the rear of the engine. A new gasket set, needless to say did
> not contain a rear seal and checking with British Parts Northwest I was
> advised that none is required. That was verified by the Haynes manual
> that refers to it as a "scroll type oil seal".
> After overhaul, the oil leak susbided substantually.
Joe, et al...
When I rebuilt my 1147 motor, I had the scroll area on the crank
"spray welded", machined & polished, so that I could fit a 1500 Spit
seal plate with a standard lip seal. Therefore, no leaks. Works great!
'63 & '68 Spits