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1987 - 1996 F150 & Larger F-Series Trucks 1987 - 1996 Ford F-150, F-250, F-350 and larger pickups - including the 1997 heavy-duty F250/F350+ trucks

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Old 10-17-2010, 03:02 PM
robjames46 robjames46 is offline
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92 f250 rear main seal

gotta 92 f250 with a 351w in it how do i change out the rear main seal i was lookin around on the internet to find a quick answer somewhere i found older trucks all u have to do is pull the oil pan but wat is the deffintion of older trucks idk am i this lucky?
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Old 10-17-2010, 03:15 PM
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RMS job requires trans. to be dropped........sorry.
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Old 10-17-2010, 03:19 PM
robjames46 robjames46 is offline
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but then what once i get the tranny out is the seal right there
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Old 10-17-2010, 03:31 PM
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Quote:
Originally Posted by robjames46 View Post
but then what once i get the tranny out is the seal right there
Yes, care must be taken when removing old seal to not damage shaft or you will be back at square one in short order. Re-installing seals is a operation in patience, surface cleaning prep, properly driving them in (flat- proper tool) and seating at correct depth.......plenty of prof. mechanics fail at this because they are in a hurry, do it right and you wont have to do it again.
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Old 10-17-2010, 04:00 PM
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Blue Rebel has a good reputation on FTE.Blue Rebel has a good reputation on FTE.
-Remove trans
-Remove flywheel/flexplate
Theres the seal, around the crank. I normally remove them using 2 self tapping screws inserted into the seal 180* apart. But be VERY careful when installing the screws to NOT touch the crank, or you WILL scratch it and it will NEVER seal again. Grab one screw w/ a vice grip, and pull it out, you may need to pry it w/ a prybar, sometimes on the newer trucks you cant just pull it out.
-To install new seal, you will need a seal driver to get it in straight and all the way in. I found a short piece of PVC pipe the same diameter as the seal, w/ one end capped, works well as a home made seal driver.
Tips:
-Make sure to lightly oil the seal lip before sliding it over the crank, helps prevent tearing of the seal in the short time there is no oil on the other side of it at first start up
-also i recommend using permatex ultra black around the OUTSIDE diameter of the seal, ive found if you just install them as is you have a 50-50% chance of oil leaking around the outside diameter after installation.

Hope this helps!
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Old 10-17-2010, 06:01 PM
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Also, sometimes the seal will wear a groove in the crankshaft, which may cause difficulties getting a leak proof seal, but you can get a repair sleeve from an auto parts store, which fits over the crankshaft. May want to check for that too, and maybe replace the front pump seal on your trans while it's out, if it's an automatic.
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Old 10-17-2010, 06:20 PM
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Yes, forgot about the repair sleeve, you may need one if the old seal has dug a groove in the C-shaft. NAPA usually is a good source. The trans pump seal is good thought too, might as well while its down.
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Old 10-17-2010, 07:15 PM
robjames46 robjames46 is offline
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thanks for all the advice and tips
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Old 10-17-2010, 07:15 PM
 
 
 
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