1986 MGM 5.0 Master Cylinder Cao-n-gasket

[Toploader]

Greetings!

Anyone have or know where I can get a new cap and gasket for my master??
Dorman does not show cap, only some gaskets and many of them look identical but have different p/ns, which tells me there is a difference DUH!

Thanks gents

[friskyfrankie]

Is it the OEM MC?

[Toploader]

AFAIK it is, I purchased the car from the original owner, and LOL it looks like its been in there since '86

[friskyfrankie]

Does this work for you? Says Cougar and Mustang but looks right!!

https://secure.cougarpartscatalog.co...sionthemeid=26

[87gtVIC]

Id be careful. The mustang stuff is smaller iirc.

[friskyfrankie]

Id be careful. The mustang stuff is smaller iirc.

Very possible but it is a lead that needs verification.

[87gtVIC]

Just did a quick search on rock auto. Different part number on the gaskets.

[Toploader]

Many thanks gents, no use ordering stuff that will be incorrect!

[gadget73]

From the master parts manual



looks like the only other things with the D9AZ part are the Town Car and the 80-83 Mark VI, which is what I'd expect.



just in case that helps track down the proper thing.

this may be shared with the F150, don't honestly know.

[Toploader]

Thain what is the FoMoCo p/n for a new Master Cylinder?

[gadget73]

I think the 2004 part number is the rebuild kit, you want the 2140 for the whole assembly.

[Toploader]

Thain do you see any potential problem purchasing an original MS NOS/Ford as opposed to current aftermarket?
Meaning, would an NOS in the box present a situation of dry/cracked internal rubber parts? I always like to purchase factory original if at all possible.

[friskyfrankie]

Agreed in theory. However, who knows how long the aftermarket ones are sitting on a shelf. I always tend to go OEM but now a days, who knows how long they are sitting?

[Toploader]

Found two on line that claim to be Ford NOS, one of which is in the Ford box. Both are just about the same asking price of $49.00
This begs the question: Is there anything internal that will "go bad" just sitting in the box, from aging?

[sly]

Yeah... problem with NOS stuff is dry/brittle rubber bits. Problem with new/reman stuff is quality of build/rebuild components. You kinda roll the dice either way. I've had no issues with the 2 masters I've reaplaced in the last 20 years with parts store new stock... but that's a very small sample. YMMV