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#1
08-13-2007, 08:41 PM
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Changing Rear Main Seal on 3.0L 123
Has anybody replaced a rear main seal on a 3.0L 123 engine. I'm sure mine is leaking and leaking bad and I could use some tips and advice on changing it. I know I will have to pull the trans and upper oil pan but will I be able to change it without pulling the crank. Is there a gasket for the upper oil pan? I can't seem to be able to buy one. And do I have to pull the balencer to remove the upper oil pan? Any info would be great. Thanks
Last edited by Forcedes; 08-13-2007 at 08:45 PM. Reason: spelling 
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#2
08-13-2007, 08:48 PM
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Instructions say you need to drop the crank. I have a theory that since the seal is in two halfs, the problem is far more likely to be in the lower half than the top half so it might be worth just doing the lower half.
There are other possibilities for a leak in that vicinity so make sure you rule them out before proceeding. Valve cover and oil filter housing to block gasket come to mind. I believe there's also an oil gallery plug at the back of the block.
__________________
1977 300d 70k--sold 08 1985 300TD 185k+ 1984 307d 126k--sold 8/03 1985 409d 65k--sold 06 1984 300SD 315k--daughter's car 1979 300SD 122k--sold 2/11 1999 Fuso FG Expedition Camper 1993 GMC Sierra 6.5 TD 4x4 1982 Bluebird Wanderlodge CAT 3208--Sold 2/13
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#3
08-13-2007, 08:48 PM
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Quote:
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#5
08-13-2007, 08:57 PM
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Quote:
__________________
1977 300d 70k--sold 08 1985 300TD 185k+ 1984 307d 126k--sold 8/03 1985 409d 65k--sold 06 1984 300SD 315k--daughter's car 1979 300SD 122k--sold 2/11 1999 Fuso FG Expedition Camper 1993 GMC Sierra 6.5 TD 4x4 1982 Bluebird Wanderlodge CAT 3208--Sold 2/13
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