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Old Apr 24, 2006 | 08:38 AM
  #1  
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From: old town usa
Question rear main seal

well im bulding another mud truck, 85fordtruck 4spd 4x4 with 289 in it. After installing carb, headers ,battery, oil,etc, and busting it off and warming it up trying to get the carb dialed in i see its leaking oil from the rear main seal. I believe its the seal not the oil pan gasket anyway. well a certified mechanic told me to drain the oil out of the motor and fill it with 4,5 quarts of transmission oil and run it a while and that would swell up the seal and stop the leak,.anyone ever heard of this or tried it? just wondering if this would work.The motor has been in the truck for 8 months i just havn't had time to get back to getting it ready till this past week due to working all the dang time.any thoughts on this. thanks .
 
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Old Apr 24, 2006 | 12:11 PM
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I wouldn't do it.
 
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Old Apr 24, 2006 | 12:39 PM
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That's awful advice. I would never do it.

If the seal leaks, it needs to be replaced.
 
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Old Apr 25, 2006 | 04:55 AM
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I agree thats a short term fix that will cause a major head ache later and doesnt always work. It's like how dealers of old would put saw dust in the pan to seal a leaking seal.
 
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Old Apr 25, 2006 | 09:06 AM
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rear main seal?

Yes i was thinking that too. your reply's just confirmed it. thanks for the quick responses marka, dungeon master and andym. ill go ahead an pull the motor and do it right way.. probably need to replace oil pump in the pan to anyway. thanks aimg]https://www.ford-trucks.com/user_gallery/sizeimage.php?&photoid=83054&.jpg[/img]
 

Last edited by toyota1988; Apr 25, 2006 at 10:01 AM.
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