Insert Bearings

[Paul_nz]

Seasons greeting to all from New Zealand.
I have several questions regarding the installation of the A-6331 Main Bearings (inserted). The instructions show the use of three thrust washers A6332, is it better to use the A6334 Model A Ford Rear Main Thrust Plate & Oil Seal in brass or do I use the A6335 Aluminum equivalent? Are there any issues with dissimilar metals brass and aluminum being in contact?
Also 1/ what are your thoughts re using a Nitrile Modern Replacement Model A Ford Rear Main Oil Seal and 2/ will it work with the brass thrust plate?

Regards Paul

[James Rogers]

Paul, I use the brass thrusts but, I make my own. I make one ring and cut it in 2 pieces. One half goes in the front block, the other goes in the rear cap. I then make another and increase the diameter by .100 and cut it in half. One half of this thrust goes in the rear block. By being .100 larger the thrust is captured by the cap and the other smaller thrust is captured by the larger one. This eliminates the need to pin any of the thrusts and allows them to float and increases the oil to all.

There is no problem with different metals reacting because there is no contact between them. I use the neoprene/cork seal. I have no confidence in the nitrile lip type seal. Lip seals are for pressure systems.

[George Miller]

Originally Posted by Paul_nz

Seasons greeting to all from New Zealand.
I have several questions regarding the installation of the A-6331 Main Bearings (inserted). The instructions show the use of three thrust washers A6332, is it better to use the A6334 Model A Ford Rear Main Thrust Plate & Oil Seal in brass or do I use the A6335 Aluminum equivalent? Are there any issues with dissimilar metals brass and aluminum being in contact?
Also 1/ what are your thoughts re using a Nitrile Modern Replacement Model A Ford Rear Main Oil Seal and 2/ will it work with the brass thrust plate?

Regards Paul

I make my own thrust. The nitrile seal I tried a couple of times, some times it works some times it does not. Make sure you check the seal dia for runout if it has any it will leak.

[Dave in MN]

Hi Paul,
Just my opinion but I feel it is better to use the combination seal and thrust surface. I have attached an installation overview of the process.
Regarding the use of a modern seal vs the original. I have no leaks with the conventional system. When I first started rebuilding engines, the rare time there was a leak from the original slinger system it was from a leak at the cap surfaces...I use a thin layer of sealant between the mating surfaces. The combination seal and thrust also needs sealant between it and the block. I have used this system on 58 engines over the last 4 years and find it works well.

Photo of combination seal and thrust



The first atttachment is a two page PDF so it may take a bit to load.
PM me if you have specific questions as to the installation.
Good Day!
Dave
www.durableperformance.net

[Paul_nz]

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Hi Guys, many thanks for your replies, most appreciated, it gives me some plans to work to

Regards


Paul