Ac185 oil streaming out bell housing vent hole

Geralddean

New User
On my AC 185, oil is streaming out the bottom of the bell housing through the vent hole. Can't tell if it is from xmsn or engine? Any ideas what seal could have failed? Thanks, Gerald
 
Makes no difference which seal is leaking. REPLACE REAR SEAL AND CLUTCH SHAFT SEALS WHILE SPLIT APART. ALSO REPLACE THROWOUT AND PILOT BEARING.
 
Great point,I bought a David Brown 990 at auction that was throwing oil everywhere out of the bell housing turned out the lift pump was putting diesel in the motor, think I drained about 5 gallons of the diesel/oil mix out the oil pan.Oil change and new lift pump runs and operates just fine.
 
You may be on to something. I captured some of the oil streaming out and it is thinner than just motor oil, so some diesel could be mixed in. Also, the crankcase is over full by some degree. Will change the oil and go from there. Thank y'all so much for your expertise!
 
Now I know who to turn to for tractor assistance, Traditional Farmer and Dr Allis. Y'all deserve the Nobel Peace prize. I drained the oil out of the crankcase. Filled up completely a 5 gallon bucket. That's 3 gallons engine oil and 2 gallons diesel. Filled back with 3 gallons engine oil and drove it around for about 20 minutes and guess what? No more streaming or even leaks out the vent hole. Now for the leak source of diesel into the crankcase, I had the injector pump rebuilt a year ago so I called the company that rebuilt it. Asked if the injector pump could be a leak path into the crankcase. He said absolutely if the front seal was bad. This tractor has been sitting unused for the past few months, so guess fuel could leak thru the pump into the crankcase w/o the engine running, as it does on small engines sometimes. So now I'm removing the injector pump to ship back to the overhaul place to replace the front seal. Hopefully, this will mfix my problem. Thanks again for y'all taking out your time to help me.
 
The shaft seal that drives the injection pump isn't part of the pump. It's on the driveshaft which is part of the engine. The umbrella type seal will be rolled over.
 
Right, there are two of those umbrella cup seals on the tractor shaft. One cupped toward the front and the other cupped toward the rear. When I removed the pump this time, the one to the rear was somewhat partially folded back out of position which was probably the leak source. Do you know an installation procedure, other than grease, to keep this very thin cup seal from folding wrong. The front one, no problem. The two or three times I have reinstalled this pump over the years, I have always had trouble with this rear umbrella cup seal. The overhaul man asked me to send the pump back so he could check it out, so I just did. Thanks, Gerald
 
I have a cotter pin puller that I use, or take a piece of coat hanger wire and bend it in an "L" with a long handle. Dull the end so it won't cut the seal when you try and tuck it in place. I use WD40 or the like, not grease. Tuck it in and slide it on an inch or so and pull the pump back to unroll it if it started to roll. Do this a couple of times while sliding it on deeper.
 

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