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06-01-2014, 09:37 AM | #21 |
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Re: Uphill oil leak
Ford knew there was a problem with oil leaking out the rear main when going up hill. There was a modification done to AA trucks because they were the ones that were doing most of the uphill work and leaking. I believe it is in the service bulletins how to fix that.
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06-01-2014, 09:42 AM | #22 |
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Re: Uphill oil leak
John,
Thank you for the information. I have read that passage in the service bulletins and I believe there is something else causing this leak because the leak occurred even when the oil level in the pan was reduced to just above the LOW mark. Bob |
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06-01-2014, 11:46 AM | #23 |
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Re: Uphill oil leak
In the service bulletins (page 306) it says that the new rear main drain pipe with a check ball for trucks that are tipped at angles over 16 degrees (lifted by the ft end to dump the load)
My car had a repro dipstick, it had the marks over 1/4 " higher than the original, and the bend on the short tang was rounded preventing it from seating fully, this added another 1/4" to the oil level The owners book says the level is full if it is up to the "F", I take this to mean that the level should be below the bottom of the F My brothers driveway is about 10 degrees, my car leaves no drip on his driveway if the oil level is midway between the L &F either running, or shut off. |
06-01-2014, 12:43 PM | #24 |
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Re: Uphill oil leak
From my calculation at an angle of 16 degrees the oil level at the back of the engine will be around 1/2 inch below the bottom of the block. This would then allow the oil to pour downwards through the rear main bearing. So a check valve would make sense in that situation. But I am fairly sure my problem is not due to that situation.
Bob |
06-01-2014, 06:52 PM | #25 | |
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Re: Uphill oil leak
Quote:
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06-01-2014, 06:54 PM | #26 |
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Re: Uphill oil leak
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06-01-2014, 11:20 PM | #28 |
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Re: Video of leak
When you said you had an oil leak I didn't know you meant YOU HAVE AN OIL LEAK.
Does it happen to have an early valve cover on it that raises the oil level quite a bit in the valve chamber? Does the rear thrust surfaces meet together at the cap? I have a oil leak I am getting ready to dive into also, its not anywhere as bad as yours. I'm going to keep an eye on this site to see your progress. Are you the Bob Johnson from Marin? Dodge Riedy |
06-01-2014, 11:29 PM | #29 |
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Re: Uphill oil leak
Dodge,
Not an early valve cover, but I do not think that makes much difference in this case. I have tried the thrust surfaces square to each other which gives a 0.008" thrust. I have also tried offsetting the cap to decrease the thrust to 0.005". Both had the same result. Yep Dodge that is me. Bob |
06-02-2014, 02:58 AM | #30 |
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Re: Uphill oil leak
dip stick
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06-02-2014, 11:15 AM | #31 |
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Re: Uphill oil leak
Bob Johnson,
The last time that I observed a rear main leak as profound as what you are showing in your video, was due to the rear main babbitt separating from the cap and was moving back and forth when the clutch was depressed. There was a transverse crack at the rear portion and another at the front, the oil was travelling through the cracks, going between the babbit and the cap and exiting through the rear. Darryl in Fairbanks |
06-02-2014, 12:03 PM | #32 |
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Re: Uphill oil leak
Darryl,
Thank you for the information. It got me thinking. When I looked at the rear main cap (removed from the block) I did notice that the babbitt job had issues. I could see some small voids between the babbitt and the cap along the top of the cap where the shims are. Maybe the oil is going down the void and exiting out the behind the thrust surface? Bob |
07-22-2014, 12:40 AM | #33 |
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Re: Uphill oil leak
Hey Bob,
Any update on your rear main oil leak? Dodge |
07-22-2014, 10:57 AM | #34 |
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Re: Uphill oil leak
Owner decided to have modern seal installed, leak gone.
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07-22-2014, 05:38 PM | #35 |
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Re: Uphill oil leak
For the time being
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07-22-2014, 05:56 PM | #36 | |
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Re: Uphill oil leak
Quote:
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07-22-2014, 06:09 PM | #37 |
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Location: New Hampshire
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Re: Uphill oil leak
Just wondering, what type of oil filler cap is on the engine. Has someone stuffed something in the cap to slow the blow by? Are the baffles bent, causing pressure in the crankcase?
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