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John Deere 630

J

Johndeere630farmer

New User
I have a John Deere 630 Gas that is losing oil out of the crankcase.It runs great and has no oil burning issues just after about 4 miles of driving the oil level gets down to the middle mark between 2 quarts and full.
Idk if this problem is the pulley side main bearing seal or the ventilation pump. It does drip motor oil on the inside lip of the clutch. There seems to be alot of crankcase pressure because when this bolt for the
flywheel cover that is drilled all the way into crankcase is off it blows out with a little oil and alot of pressure and this is at the top of the crankcase. Wondering if someone could point me towards the issue.
 
A compression test and a leak down test would tell you how well the piston rings are sealing.
 
I forgot to mention the fact that I did drain out the equivalent of the oil I have lost from the crankcase from trans and ik that because I drained the trans down to the level hole when I changed the oil in it. I was just wondering if there is anything that will cause it to blow out around that seal other than it being bad. I am planning on replacing that crank seal this winter anyways the tractor is rarely used for anything but taking to shows and our ffa drive your tractor to school day so ill just keep adding oil to it for now.
 

If the Seal is leaking, the Main bearing is most likely failing from oil starvation..

The "O-Ring" between the crankcase and the bearing quill will swell up and close the oil passage..

I suggest you find an old electric lamp with the hollow Brass tube at the top, cut a short piece the appropriate length (the threads match the ones in the crankcase).
It should protrude out of the engine block only enough that the Rt Main Bearing quill will not contact it..

This eliminates that possibility of loss of oil pressure to the Rt Main and Rod bearings..
 

Listen closely to what Brush Hog is saying.. Went through this on ours couple years ago & caught it
be for it burn up the crank bearings.. If the Oil Pressure shut had leaked gas into the crank case in the
past it s sure sign the O Rings might be a issue.. PLEASE So BOTH side!!! Flywheel & Pulley/clutch..
 
Tanks so much for the help I will no longer be running it now that I know this and gas has gotten in the crankcase quite often before so I will be replacing the seals.I just took the inspection cover off and the rod bearings have been getting oil but im not risking it. Where do you install this brass tube at?
 
Here's a couple of pictures showing what Ron is talking about.

One picture shows the tubing installed, with another piece of tubing in my hand.

The other picture shows the tubing with the square "O" ring in position around it.

The tubing has to be screwed in enough to allow the main bearing housing to seat properly. You can measure the depth of the recess in the housing to be sure you're ok.
a173863.jpg

a173864.jpg
 
Thanks a bunch when you pull that main bearing off do you need to support the crankshaft or will the other side hold it up? Got the reduction gear cover off today and im gonna have to do alot of cleaning because everything is covered in dried gear oil.
 
I wondered about supporting the crankshaft, but the manuals didn't seem to address the question. I did not support the ones that I've had apart.

You'll probably need a long reach puller of some sort and a little heat to get the PTO drive gear off. A fish fryer setup (hot oil) will heat the gear to help you get it back on. It might need a little bumping with a brass drift. All of these ideas came from guys on this forum.
 
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