Mred355

Hi guys. I just recieved the rear main seal for my 1976 350 and aren't sure where all the parts go. The kit has 6 pieces and I am not sure how they go. Any help would be appreciated. Thanx in advance.
Ps: a video would be kool. this is a Victor Reinz JV 748 seal

Oldsmaniac

I would have to ask what the 6 pieces are? Normally there are 2 pieces and they are rope (factory) or possibly the neoprene (after markets/ford)

edzolz

I'm not familiar with that brand but the other aftermarket seals that I have used had the two neoprene half circle seals that fit into the rear main cap and block area that they are made to fit. Insert them with the lip facing inward so pressure will force the seal tighter. Don't know what the extra pieces are for in your kit, diesel block, maybe?

Nufo

Not really... the two straight pieces are for the side rails and I'm guessing the two narrow pieces are made of metal... they go with the side rails into the real main seal cap. Well, at least that's how it works on a Ford Y block

Others will jump in to correct me or confirm

Nufo (Fred)

MDchanic

Correct, Fred. That's a F_rd Y-block seal.

When used on the Olds 350, you throw out the four straight pieces and use the two curved pieces.

The installation orientation of the seal can be seen here:



See this thread for more information. There is more general gasket information here.

- Eric

Mred355

Thanx Guys for all the help. The directions that came with the seal were very misleading. They said to use all the parts. I just tossed 4 pieces and used the 2 correct ones. Thanx again Ed

Octania

So, was this bought as an Olds seal, or as a Ford seal.

If a person sells the seal an "for an Olds" then they ought to
1) remove the extra pcs
2) Print a %$#% instruction clue sheet, assuming that the buyer is not stupid but not well versed in the installation process either. If they DON'T need the clue sheet, fine. If they DO need it, all is well. In this day and age of easy printing, there's no excuse to not supply instructions like that.

MDchanic

This is a F_rd seal.
The instructions were for a F_ord.
On a F_ord, you have to use all the parts.

Your car is an Oldsmobile.
This seal was not made for it.
Of course the instructions didn't apply.

- Eric

costpenn

On the 350's the story with that Victor number is that the original application for that seal is not for Fords but for the Buick 231 V-6's which utilize the side seals. (not that all engine builders ever used them!)


My company offers the same seal - it's our P/N S1389.

http://www.enginetechcatalog.com/Int...Rear+Main+Seal


We also offer the 455 seal - it's our S3502 made out of Viton with an offset lip design to help fight weeping. As mentioned, the original application for this part is Ford 429/460. Full specs on the link


http://www.enginetechcatalog.com/Int...Rear+Main+Seal

JAMCAR223

Was doing some research on the JV748 rear main seal, and figured I would post this for future reference.