Dd13, where’s the oil leak?

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by wtokhi, Jul 5, 2022.

  1. wtokhi

    wtokhi Light Load Member

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    Nov 3, 2017
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    Hey y’all, dropped a dt12 for a clutch actuator issue and was gonna change the rear main seal since it was dripping from the little hole in between engine and tranny, rear main seal was changed back in February when the split pin bushing was done on the trans so it was weird to me that it was leaking again, after dropping the trans removing clutch and flywheel, the rear main seal looks dry, see picture, the input shaft seal was also replaced in February and is dry as well, I’ve noticed there’s oil behind the rear main seal lip but no traces of it dripping down or on the flywheel, starter has oil buildup by the bendix gear and seems to be from there, how could that happen ? where else could oil be coming in from to leak from there? Bell housing ?
     

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  3. armo

    armo Light Load Member

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    Jun 16, 2022
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    gearhousing gasket is leaking... forget about it. live with it
     
  4. Heavyd

    Heavyd Road Train Member

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    Wow, that is literally nothing. I would not be getting worried about that. If the starter area is worse, I would think it is coming from somewhere else.
     
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  5. Antinomian

    Antinomian Road Train Member

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    Crankcase breather? Put your hand on it and make sure it's spinning. They are about $450 if you have to replace it and they are easy to do yourself.

    You could also have a drip from the turbo oil return tube. You'd probably see evidence of that around where it connects to the block though.
     
  6. wtokhi

    wtokhi Light Load Member

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    Nov 3, 2017
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    yeah i know it aint much its just that i had the tranny down so i thought id get to the bottom of it while i had the chance.
     
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