Norm,
All A-series have a scroll seal at the rear main. There are severel issues
related to leaks from the rear of the engine, not all of them having to do
with the scroll seal. If the oil pump cover is not sealed well or if your
read mounting plate gasket is poorly sealed, you can have leaks there too.
There is also a procedure to make sure the half moon seal (block half) is
properly installed. Also, are you sure all your crankcase vents are clear
and working properly. Negative pressure assist from the manifold is a
necessity also, especially if you suffer from too much blow-by. I'll dig up
and old email I wrote about some of the procedures and forward it. Maybe
someone that saved it could post it too.
Gerard
At 10:42 PM -0400 4/27/02, N wrote:
>Finally got the Turner running well enough to have a go At VSCCA Spring
>Sprints at Lime Rock 2 weeks ago. Other than no power, hard, slippery tires
>& trying to learn to deal with RHD, the only major problem was a really bad
>oil leak. Had puddles under the car, on the right-side floor and all over
>the bottom of the engine & chassis. It would seem that the front &/or rear
>seals are leaking. But, are they?
>
>Engine was taken apart and reassembled by the wrenches at New England
>Classics & checked for wear & tear during the last 7 months. The sump is an
>extra-wide custom one that holds lots more oil than stock & makes dropping
>the pan a real bear. NEC's owner tells me the 948's have a screw-type deal
>on the rear of the crank to prevent oil from exiting. Do they?
>
>And, have any of you who race cars with 948 BMC A engines had a problem like
>this? I used 2 quarts of oil in 3 practice/race sessions. I don't use that
>much in my MGB in 3 months of daily driving with 60+ laps of racing thrown
>in. And, the MGB last had a complete engine rebuild in 1986. Only
>crankcase vent on either engine is stock one from side tappet gallery cover.
>I removed 948 oil filler cap & revved engine to check for excessive
>pressure, but there was none to speak of at up to 4,000 rpm's.
>
>Any thoughts will be appreciated.
>
>Norm Sippel
>'59 Turner aka Exxon Valdez
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