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HELP!! Rear main seal replace on 400

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Kelly C

12-06-2003 09:10:17

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Can some one give me the poop on this? I have a kit for this with the seals, plugs some gaskets ect.

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Greasy John

12-06-2003 11:58:40

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Re: HELP!! Rear main seal replace on 400 in reply to Kelly C, 12-06-2003 09:10:17

Cant say for sure but if your 400 is like my c175 engine in the 350 you must remove the pan to get that flat filler bar under the bottom half of the seal holder to be able to slip that half down to clear the flywheel mounting flange. I just put my rebuild job back together 2 wks ago. Took the advise of a local so called tractor mech-and will break it in half again in the near future to do it over. I oiled the seal lightly and left the ends up a slight amount as per his advise. and it leaks. Seems to be getting better but I dont have much hope for it. Next time will soak the seal overnight--maybe 3 days .LOL John

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Aces

12-06-2003 09:32:25

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Re: HELP!! Rear main seal replace on 400 in reply to Kelly C, 12-06-2003 09:10:17

You will have to pull the pan. Then the two screws in the bottom half the four screws in the top half and the two screws that go from the top half down into the bottom half and then it should come off. Dig the old felt out of each half. After you clean it up good hold the two halfs together as they are on the block and see how much warped they are where they fit together. If much warage I would get new, because is a bad place for leak when you put it back together. Stuff as much new felt as you can in the groove as you can. I understand from some on this forum that some new felts are to long. When I was doing this therty years ago the felt was the right length and we used it all. After you stuf the felt in the grooves but some oil on it and reinstall on block. Tighten the two screws that go down through to the bottom half first, but after you have all screws started. Use a good gasket sealer on all parts. Hope this helps.

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49 Cubber!

12-06-2003 09:26:33

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Re: HELP!! Rear main seal replace on 400 in reply to Kelly C, 12-06-2003 09:10:17

WHat CNKS said!Just take it apart,clean it up and put it back together.Ive heard saok the seal and not soak the seal so Ill leave that up to others to decide for you.Ive heard soaking the seal and then putting it all back together with the seal wicked in oil can cause the housing to crack.Ive done it like this with good result.Soak it good like overnite,then ring out the excess and put it in.I have only done this a couple of times or so and have never had any problems with anything breaking or wearing out quicker.

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49 Cubber! One more thing

12-06-2003 09:29:49

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Re: Re: HELP!! Rear main seal replace on 400 in reply to 49 Cubber! , 12-06-2003 09:26:33

I didnt let the seal ends meet at the seam between the two housings.I left one end long so that the end of the bottom seal was in the top housing and one eand of the top seal was in the bottom housing.Understand?

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Kelly C

12-06-2003 09:36:04

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Re: Re: Re: HELP!! Rear main seal replace on 400 in reply to 49 Cubber! One more thing, 12-06-2003 09:29:49

Yup. Thanks.
looks like in the kit I have like a 1/4 of a pan gasket.

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justin

12-06-2003 10:58:42

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Re: Re: Re: Re: HELP!! Rear main seal replace on 4 in reply to Kelly C, 12-06-2003 09:36:04

do you mean the U shaped gasket that has two 1/2 holes cut in the outside of the two short sides? this is the gasket that has to be replaced by removing the oil pan. Kinda confusing to explain, but if you look in a parts book I think you will understand how it goes. The same basic rear seal design was used on the H thru the 450.

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CNKS

12-06-2003 09:19:32

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Re: HELP!! Rear main seal replace on 400 in reply to Kelly C, 12-06-2003 09:10:17

I've done this once, and don't remember much about it, so there must not have been much to it -- so that makes me an expert? Not trying to be funny, but take it apart and put it back together. Soak the seal in engine oil before installation.

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Kelly C

12-06-2003 09:25:35

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Re: Re: HELP!! Rear main seal replace on 400 in reply to CNKS, 12-06-2003 09:19:32

It does not appear that I need to remove the whole oil pan. Did you have too?

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CNKS

12-06-2003 09:33:39

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Re: Re: Re: HELP!! Rear main seal replace on 400 in reply to Kelly C, 12-06-2003 09:25:35

Mine was off, but I had it off for other reasons, and can't remember if it was really necessary. Try it without removing it -- nothing to lose, unless there is danger of getting crud into the pan.

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