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Crank Seal
I have oil coming from behind the crank pulley, but can't find a listing for a crank seal. The diagram shows the damper, crank pulley, and then a "companion flange". I just did the timing belt and cam seals, and wonder if I may have upset something behind the crank. Anybody dealt with this before?
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1985 744 D24T M46 49mm t3 @20psi 280k Last edited by adamdrives; 02-11-2017 at 05:53 PM. |
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mods can delete this thread. paper catalog shows seal.
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1985 744 D24T M46 49mm t3 @20psi 280k |
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Is there oil slung all over the place, as thrown from the rear edges of the cogged crank gear and damper pulley? Oil slung out from the pulleys indicate a leaky front crankshaft main seal. If not, suspect a leaking oil pump gasket, or (less likely) a leaking oil pump (possible cracked or damaged housing).
See Leaking Front (oil pump) Cover Oil Pump (less likely)
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1985 744 gle d24t 1985 745 gle d24t |
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It's the oil pump gasket, I can see it bubbling out behind idler It also collects down in pulleys and sprays all over, I think I will do crank seal while I have the pump out. The odd thing is the bolt holding in the old idler was a long 6mm bolt. The threads in the back of the idler/head are 8-10mm. So someone either lost the bolt or messed something up, and threaded a longer one in. Not sure what to make of that.
Hard part now is finding an oil pan gasket for less than $50 shipped that can come in a reasonable amount of time. Does the crank seal get pressed in oil pump housing from behind? Thanks for linking the writeup!
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1985 744 D24T M46 49mm t3 @20psi 280k |
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The 6mm bolt is correct for the idler, it's long. It goes through the idler, through the oil pump housing and threads into the block. The larger threads on the idler itself are for using the puller to remove it.
The crank seal is R&Red from the front. Make sure to get the crank bolt torqued down with locktight!
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12mm pump heads, ARP stud kits and GTD nozzles available! http://d24t.com/showthread.php?t=1646 NA intake manifolds and 240 turbo pans for sale. Need d24 or d24t parts? PM me! Shipments done on fridays! 1982 242 D24+T/M46- Super pumped! Build thread: http://www.d24t.com/showthread.php?t=1545 1984 764 D24T/ZF build thread: http://www.d24t.com/showthread.php?t=1734 Diesel parts cars: 82 244,83 244, 84 244, 84 245, 85 745 |
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Is the idler bolt removed right now? Sounds like maybe you just need to put it back in, if it was removed and not put back in, that could be what started the leak.
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86 745 D24T/ZF 345k lifted 2.5" 83 764 D24T/M46 155k |
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Yep, Right now it is held in with what I thought would be the correct bolt, but if it is the 6mm I'm sure that's why it's leaking. This is good news, I will try with the correct bolt and see what happens. It seems to be leaking only from the flange around where that bolt would go. It looked so spindly I couldn't believe it would be the correct bolt. Thank you anders!
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1985 744 D24T M46 49mm t3 @20psi 280k |
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Got the correct bolt back in and no leaks! It looks like a very small bit of wetness where it was leaking, could be oil squeezing out of gasket. I should probably plan on doing it when the weather gets better.
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1985 744 D24T M46 49mm t3 @20psi 280k |
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