MF35 Oil Leak

Farmer14706

New User
I have a 1961 MF35 that has the tachometer cable connected to a cover on the back of the engine, with the cover held by three bolts. When I'm climbing a steep grade, there is a small hole in the cover that allows engine oil to come out. Since I use the tractor for skidding log on our hills, I'm getting a lot of oil out of the hole. There is also a small groove in the cover the matches a small hole in the engine block, but doesn't seem to do anything. I'd like to plug the small hole in the cover to prevent oil from coming out, will that cause a problem?

Thanks
 
If you are operating a 3 CYLINDER PERKINS DIESEL Engine,(A3.152..AD3.152) then I have the same machine. If you PLUG the weep hole, you shall be allowing engine OIL to pressurize the TACH.DRIVE connector. "OIL SHALL" work it's way up the TACH.Cable and pressurize the TACHCOMETER! The weep hole is telling you, the OIL SEAL on the REAR of the CAMSHAFT requires attention/replacing.
The last seal I replaced,I had to installed a SPEEDY SLEEVE on the CAMSHAFT, as the SEAL had worn a GROOVE in the matting surface of the peripheral of the CAMSHAFT. Here are several PICS. I have NEVER installed a SPEED SLEEVE other than on a COMPLETET overhaul. The seal can be replaced by removing the 3 CAP screws that attach the TACH.CABLE connector to the rear of the engine block. Possibly only the SEAL requires replacing.

Bob...
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Bob,
Thanks for the posting, it's very helpful! My 35 is a Perkins diesel and is the same as the pics. My tach cover looks identical, but when I removed it, I didn't find that thick rubber seal you show in the last picture, just a thin gasket that goes around the edge of the cover. Do you know the name or part number of that seal and I'll order one.

The thin gasket that I have allows the cover to mate up against the engine block. The thick seal shown appears that the cover would not press up against the block, is that correct?

Also, do you know why that cover has a small groove on the bottom (you can see it in the picture)? There is a small hole in the engine block that matches that groove location, but it appears the oil would come out of the engine block hole, go into the small groove, and then stop, since the groove doesn't lead anywhere. The hole that is currently leaking oil when on a steep grade is below the center hole (tach cable), and above the groove. Your explanation of that hole being a weep hole to prevent a pressurized tach cable makes since, but I don't understand the need for the groove, especially if that thick seal will cover it.

Thanks again for your help!!!
Dan
 
Massey Ferguson:#'s
30854, 34058, 636732M1, 636762M1:
Info on supplier and Diams. of SEAL:
Perkins:#'s
30854, 34058
SPAREXS:#'s
S.41371
Oil Seal DIAMS: 7/8" x 1 3/8" x 1/4"
1985, was the last time I had to pay attention, to the OIL SEAL in the TACH:Drive Housing: At that time I purchased a SEAL from a local SEAL,HYDRAULIC SHOP.YES, the housing that the SEAL is installed in, is attached TIGHT /FLUSH to the ENGINE BOCK.
As for the small hole in the ENGINE BLOCK that aligns up with the machined grove in the TACH adaptor, I can not recall, the purpose for this design. Possibly, the hole in the BLOCK allows oil that has passed by the OIL SEAL ,to return back to the engine? Or possibly lubrication is supplied from that small hole?
Someone with a definitive answer may add value on this topic?
Bob..
 
(quoted from post at 10:11:14 01/08/16) Extremely helpful Bob. Thank you very much!!!
Bob,
The new seal seems to be working. Also, I think I figured out why the groove is in the bottom of the tachometer cover plate. Apparently when my tachometer cable broke, the end pushed the seal back into the engine block, allowing the oil easy access to the drip oil. Also, it appears the groove was blocked with old blue RTV, so the oil in the bottom of the tachometer chamber was trapped. That groove allows that oil to drain back into the through the small hole at the bottom of the groove.
After cleaning everything and installing the new seal and tachometer cable, it's running great and no leak/drips. I'll test it on a hill this Spring when the snow melts.

Thanks again for all your comments and pictures.... it really helped me!!!
Dan
 

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