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Old 05-11-2019, 09:08 PM   #1
31Abone
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Default 21 stud motor oil leak rear of pan area

1934 21 stud motor leaking oil out of rear pan small hole under flywheel about a half cup when hot after a run ..do I need to pull the motor to fix it ?? oil getting on clutch and chattering ..
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Old 05-11-2019, 10:11 PM   #2
JSeery
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Default Re: 21 stud motor oil leak rear of pan area

That's not really part of the oil pan (as in the part that contains oil). It is the lower flywheel/clutch cover. The hole is to allow any oil that gets past the rear main seal a place to escape. And the rear seals tend to leak. The oil is leaking down between the rear of the block and the flywheel and should not get on the clutch surface. One reason for the rear seal to leak (which is basically just a slinger) is over filling the oil or something else that is increasing the oil escape through the slinger. There should be a cotter pin in the hole that jiggles around to keep it open.

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Old 05-12-2019, 12:56 AM   #3
ford38v8
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Default Re: 21 stud motor oil leak rear of pan area

Too much oil in the crankcase, or parking on an uphill slope will cause oil to run over the slinger into the clutch cover, but the clutch chatter would be caused by loose or worn out motor mounts.
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Old 05-12-2019, 07:55 AM   #4
Adam/Mill Valley CA
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Default Re: 21 stud motor oil leak rear of pan area

I had the same issue with my '36, which has a poured-bearing 21 stud motor. There is a cork gasket strip separating the main oil pan from that rear clutch/flywheel chamber, it had basically corroded to the point where it was no longer keeping oil in the pan. Pulled the oil pan, replaced the seal and all was well.


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Old 05-12-2019, 12:42 PM   #5
31Abone
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Default Re: 21 stud motor oil leak rear of pan area

Good reply's.. I'm familiar with Model A and B oil slingers and the return pipe, does 21 stud have a return pipe as well ? guess I need to drain oil and see how much oil is in pan ,reinstall and add 5 quarts and calibrate dip stick..plugs look good "not perfect" and no exhaust smoke..I started motor on the hoist while running and could see no oil leaks ..but at speed on the road and then stopping oil comes out of clutch cover drain hole at a rapid rate.....fun never ends with old cars.
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Old 05-12-2019, 02:16 PM   #6
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Default Re: 21 stud motor oil leak rear of pan area

Quote:
Originally Posted by 31Abone View Post
Good reply's.. I'm familiar with Model A and B oil slingers and the return pipe, does 21 stud have a return pipe as well?

Some do and some don't, almost need to check to be sure.
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Old 05-12-2019, 03:48 PM   #7
Ken/Alabama
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Default Re: 21 stud motor oil leak rear of pan area

A worn rear main bearing with too much clearance will cause it also.
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