Can anyone step me through a rear main oil seal for my 1977 F250 , its leaking a quart a day since it's been sitting for years. This thing is coming back to life! This is the last major leak to seal.

 

engine is the 351M ... not windsor (I know).. is this a major job or can it be done without removing tranny and lifting engine etc

 

Welcome to FTE!

Here's a link of a thread I started about my rear main seal woes. I ultimately replaced my engine because of my old worn out main bearings but hopefully yours isn't as bad. What do you have?

https://www.ford-trucks.com/forums/1...-with-pix.html

 

hey thanks, ya lots of great articles on here.

I skimmed your thread there, seems like getting in and out wasn't a huge problem, obviously yours turned into more of a can of worms than i am hoping for!

Not sure I'll have the same access on the 351 as you did with the 400. Did you have a step through in a Haynes style book?

I just bought a 77 f250, rebuilt the front and rear ends with all new axles, seals bearings etc, and pretty much all bolt on pumps and filters etc.

I went with new edelbrock valve covers/air filter and eliminated a PCV that that ran from the cover to filter. I noticed something in your thread about that, so maybe I need to rig it back up and it wont leak as bad? Seems like a pretty simple hose to cause such a leak tho.

 

That is a very needed component. Without it you are effectively pressurizing the system causing even more leakage with greater quantity.

You need a PVC valve and line to the back of the carb AND a breather to the air cleaner.

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As soon as you said "rear main is leaking" the first thing I thought of is you need to replace your PCV. Fords it is SUPER critical to have a crank case evacuation system. Put a new pcv and new breather in it and I bet your leaks go down to almost nothing.

 

OK, I should be more specific. I kept the PCV to CARB hook up. I then put a simple edelbrock breather cap over the other valve cover that originally connected to the air filter. So it's getting air and has it's own small filter. Is there any reason that I need to connect a hose to the air filter or does the breather cap serve same purpose? Maybe it's not the regulated amount of air? I should probably stop messing around and set it up right!

 

"Teaching my Son the fine art (And almost lost art) of auto mechanics. Mom wasn't happy about his pants getting trashed. "

Can you leave this info out of the "man" post that you posted? I mean "mom wasnt happy about his pants, etc. Really? The boy wants to grow up and you seem...well..like a wife?...LOL Uhhh, I got dirty datty, waht now...Mommy will be mad...LOL The boy is awsome. Not afraid to get dirty and learn something. Get him in colledge and he will....I'll stop here..LOL

Just kidding here. Awsome post's.

 

The pcv should be hooked up to a vacuum line, not a breather port in the carburetor. So check and make sure that's right. The breather in the valve cover is ok. A vacuum line will be BELOW the throttle plates in the carb, a breather port will be towards the top of the carburetor.

 

I've hooked up everything as it was stock with the new edelbrock valve covers and filter. The vacuum connects to below the throttle plate and the breather hooks up to the filter (above the carb). I havent actually taken it for a proper drive to see if this has helped my leak because I (out of no where) have a steering linkage issue where the wheel jumps when turning harder, .... ENDLESS PROJECT .

Ripping out the steering linkage today....