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Oh Dear Oh Deary me Rusty Old Mate!
You will find that the recess for the O ring is shallower on the later model (post '86) than the earlier models (pre '85)s well as being quite a bit bigger in diameter. The post '86 gasket is also thicker as is the O ring and nylon backing washer. It's either or ...
If you omit the gasket, you don't need the nylon backing washer (which is to prevent the gasket blowing out). Sooooooo ... you need a quite thin, larger diameter O ring. The O ring should be a neat fit in the recess, and sit slightly proud. If the O ring is too thick, it will split when you tighten down the front cover.
Sharing a workshop that happens to do LOTS of auto trannies as I do, I usually just use an O ring that is just the right size (diameter and thickness) from an auto tranny overhaul kit. The one in the pic would not be satisfactory. Too small in diameter. I'm surprised that the correct ones are not supplied in the kit. If you didn't get it dead centre, it could slip, and then you will have ALL sorts of low oil pressure problems.
Seeing I can't teleport you one the correct size, you either use the factory front gasket, O ring and nylon backup ring as per your other pic, or go and get one the right size. Most engineering shops have a box that has ALL sorts of O rings. Either that or go and visit your local Auto Tranny Overhaul shop.
Cheers,
Leon
Quoting Russell Duffy <13brv3@bellsouth.net>:
Greetings,
I went out to finish putting on the front cover, but didn't get far.
Attached are several pics of the front housing where the o-ring goes. One
shows just the housing. One shows the old o-ring and nylon backing
washer.
The other shows the washer that came in the overhaul kit. Previously, I had the thicker o-ring with backing washer, and the front
cover used a gasket. The kit instructions say to not use the gasket
(and
none is included), since the included o-ring is thinner. The
instructions
call the nylon washer version 89 and later, so it appears that's what I
have, though I thought I had already determined that my front housing
was an
87-88. Just another mystery. Anyway, the kit instructions say- "Choose the correct o-ring for your
application: small diameter for 86-88 models, larger diameter for 89 and
later". The o-ring in the picture is the only one I see, except for a
tension bolt o-ring that wasn't needed. As you can see, this doesn't
fit
the milled recess in the housing, though I suppose it might still work
OK.
In the video, the o-ring that Bruce installs fits in the outer diameter
of
the recess. Is this the correct o-ring, or the "small" one that should
go
to the 86-88 model? It just doesn't look right to me, and this is
fairly
important. Worst case, I could always get a gasket and put it back the
way
it was, with the old o-ring.
Thanks,
Rusty (no further aircraft purchased since starting this message)
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