WD-9 Flywheel Housing Oil Leak

WD9ER · Mar 5, 2012

I have been trying to understand an oil leak that I have on my WD-9. There is oil leaking from the two tapped holes directly on the bottom of the flywheel clutch housing. When I first began the project, both of these tapped holes were plugged with gunk so I cleaned them up and a small amount of oil began to run out of them (less than a quart). I then plugged both of them with a bolt. I continued to notice oil dripping oil from the area near the bracket for the rear ball pivot for the front axles (area directly beneath the flywheel). I then removed these bolt and there is still a few drips of oil coming from these holes now being they are the lowest point on that particular casting.

I don’t believe there should be oil in this area being it is the flywheel and clutch housing, but I am not sure how far rearward on the tractor this cavity extends and if there is seal out , possibly the engine rear main?

I can’t find anything in the parts book showing if these two holes should be plugged or open for draining? It seems as if something should be in there being they are tapped.

sflem849 · Mar 5, 2012

To my knowledge you have your rear main seal (fairly common leak) to the front and a couple trans seals to the rear. You may only have one on a 9 series???
Here is a picture I already had. You can't see too much, but it gives you an idea of what is going on in there.

d282 · Mar 5, 2012

Your back main bearing is worn along with the rear main seal which
may be no more than a piece of felt. To completely stop the leak
you will need to have the crank turned and install a new set of
bearings. This is a common problem from letting the engine idle
too slow for too long.

sflem849 · Mar 5, 2012

(quoted from post at 08:46:01 03/05/12) Your back main bearing is worn along with the rear main seal which
may be no more than a piece of felt. To completely stop the leak
you will need to have the crank turned and install a new set of
bearings. This is a common problem from letting the engine idle
too slow for too long.

Doesn't mine have a new rear main seal??? Was the seal retainer flat? I am sure I told you about my MD retainer, but WD-9er may not know about them. The retainer is made out of white metal and it warps like CRAZY. It was 1/8" warped between the bolt holes and NO gasket would stop that kind of warpage leak. Maybe the 9 series had a metal one? I know the 400d/450d had a metal one.

WD9ER · Mar 5, 2012

Yeah, that is what I figured was the case. Honestly, I do not think that I am going to fix it at this point. I guess I still have the question about the tapped holes. Was their originally bolts/plugs in there? I am contemplating just using a sealer on the bolts/plugs to keep oil from dripping and then draining it prior to using the tractor.

d282 · Mar 5, 2012

I would not plug the holes because what ever oil leaks through
as you are running it is going to get thrown around and oil up
your clutch. There is a WD-9 in western MN that belonged to a
road crew before the current owner overhauled it. It would run a
drain pump 24 hours a day, 7 days a week and every Friday they
would make sure the oil was a little overfull and put a 5 gallon
bucket under the rear housing. Monday morning they would
dump the bucket of oil back in the tractor and keep going. I did
not believe the story until I was fortunate enough to meet the
current owner this summer. The tractor is now in its Sunday Best
and enjoys going to the fall plow days.

WD9ER · Mar 26, 2012

Does anyone know a part number and/or source for the rear main seal on the WD-9? I can't seem to find it in the parts book. Is it something I could replace without pulling the engine?

stc · Sep 15, 2015

(quoted from post at 10:20:54 03/26/12) Does anyone know a part number and/or source for the rear main seal on the WD-9? I can't seem to find it in the parts book. Is it something I could replace without pulling the engine?

did you ever get an answer? did you have to pull the engine? thanks where you able to find the seal?

anglo4 · Jan 3, 2016

I don't know where you are on the globe but HistoParts in Holland do the felt type and for quite a lot of money, a neoprene version.

WD-9 Flywheel Housing Oil Leak

WD9ER

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sflem849

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d282

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sflem849

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WD9ER

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d282

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WD9ER

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stc

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anglo4

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