The hole in the adapter plate will not fit over the seal. You would need to
look at it on a 1275 because I think it's a little different. I talked to
Bill at Rivergate and sent him the seal kit when I removed it from the car.
He did not seem to think the plate could be machined to work with it. The
problem was the area between the hole for the crank and the hole for the oil
pump was already at it's limit and nothing could be removed.
You might talk to Bill and see if any of this has changed.
Larry
-----Original Message-----
From: Ron Sextro <rsextro@wre.adelphia.net>
To: Larry & Sandi Miller <millerls@ado13.com>
Date: Saturday, February 20, 1999 6:36 AM
Subject: Re: Rear Seal
>Larry,
>
>I'm in the process of rebuilding a1275 that I had hopes of installing the
MM
>crank seal. I'll eventually install the Datsun 5 speed behind the engine.
I'm
>concerned about your comment indicating that the seal could be not be used
with
>the 5 speed. What was the problem? I would think the seal would not
interfere
>with installation of a different transmission since it's behind the
flywheel.
>If it is caused by interference with the adapter plate, couldn't it also be
>machined to work with the newer seal?
>
>Ron
>
>Larry & Sandi Miller wrote:
>
>> The following comments are based on the installation on a 948. The seal
>> worked perfectly but had to be removed when I installed the 5-Speed.
>>
>> The rear main oil seal I used is the one sold by Mini Mania and requires
>> some machining.
>>
>> It comes with a new crankcase rear cover, this is the half moon shaped
piece
>> that completes the circle around the crank with the rear main cap on the
>> bottom and along with the rear main cap acts as the oil seal.
>>
>> The new piece is bolted to the block in place of the old and the upper
half
>> of the seal carrier mounts to it. The lower half of the seal carrier
bolts
>> to the upper half.
>>
>> According to instructions the new crankcase rear cover and the rear of
the
>> main bearing cap should protrude from the block exactly the same amount
(10
>> to 11 mm). When the engine was produced, the rear main cap was cast and
>> then machined in place to fit perfectly(for a while). The rear end of
the
>> cap however was not machined and was left as cast. The lower half of the
>> seal carrier needs to fit flush against the rear main cap and unless it
>> extends exactly 11 mm (the thickness of the new crankcase rear cover)
the
>> seal between the carrier and the rear main cap will not hold, hence the
>> machining.
>>
>> After looking at this thing and talking to a machinist, we decided the
best
>> way to get this to work was to bolt the rear main cap and the new
crankcase
>> rear cover to the block and mill them at the same time to insure that
they
>> are flush with each other.
>>
>> Out of the box, and assembled on the engine one side of the cover was
higher
>> and one side of the cap was higher.
>>
>> Larry Miller
>
>
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