Rear main seal on C123 engine

PaulW_NJ · Dec 21, 2008

I"d like to replace the rear main seal on my 240U, which has a C123 engine. According to the I&T manual, you have to split the tractor. I"ve also read that in a number of the archives here. However, a friend told me there may be another way without splitting, where you snake the seal around from below using a wire "fishing line" of sorts. Anyone know anything about that on the C123? Any comments on replacing that rear seal would be appreciated.

P and R Pete · Dec 22, 2008

Here's a pick of where my rear seal sits, and the split-casing that holds it. The flywheel is bolted onto the rear of the crank there. I don't see how you'd get wrenches in there to get that casing off. Otherwise, it's a two-piece felt seal.
Maybe someone else knows aomething I don't.

RickB · Dec 22, 2008

Your friend is dreaming. After you split the 240 and remove the rear seal carrier, make sure it is flat where it bolts to the block. Often the leak is at the gasket surface, not the seal. You can rework the carrier on a flat plate with a brass slug or a other fairly large object with a flat end.

PaulW_NJ · Dec 22, 2008

I appreciate the responses. P and R thanks for that great picture . . . that clears it up for sure!

Anonymous-0 · Dec 22, 2008

Your friend doesent know about the seal on a 123. Youwill have to split to replace. The pic thats posted is great.

bc · Dec 22, 2008

I don't know much about the C123, but its too bad they don't have some type of gasket compound or goo that you could inject through a hypo and tube up around the seal on the inside accessing it from the pan area or snake some kinda string packing around it. May have a counterweight to rotate around to get at it. In this day and age of all kinds of anti-leak compounds out there, it seems like there ought to be something out there for a seal fix. Cut down some two piece hydraulic packing or something similar. I don't know how much room there is on the inside to do much.

I'll just throw this out there and maybe some inventive minds on this board can come up with something or maybe they won't.

P and R Pete · Dec 22, 2008

Paul, one more. Shows the backing gasket, the cork ones that seal the two halves, and one half of the felt seals that fit in a groove in the seal-carrier.

PaulW_NJ · Dec 23, 2008

Thanks for another great photo.

I started out to replace the rings (2 broken oil rings) and discovered the bearings were all worn down to the copper layer. Since I"m going that far, I felt I should replace the rear main seal, even though I hadn"t planned on splitting the tractor, particularly because I didn"t want to remove the loader. I"m going to try splitting by rolling the rear out of the loader frame. Thanks for your help!

Rear main seal on C123 engine

PaulW_NJ

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RickB

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PaulW_NJ

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Anonymous-0

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bc

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P and R Pete

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PaulW_NJ

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