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Thread: rear main seal??

  1. 03-21-2009 02:16 PM #1
    msl85's Avatar
    msl85
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    rear main seal??

    I'm back with some more questions. So i got the 6.0 in and recieved my nelson tune yesterday. was pretty good day until i noticed a oil leak, every time i check my oil it shows good, but every time my truck sits it leaves a pretty decent lil puddle.was pulling into the house earlier and noticed some smoke coming from underneath the truck and jacked it up and there was oil dripping from in between the motor and bell housing of the tranny. thinking its the rear main seal. any help would be greatly appreciated
    02 chevy 1500 ecsb. 02 lq4 6.0, nelson tuned.(sold but still in the family)

    89 chevy 1500 rcsb -under construction-
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  2. 03-21-2009 02:18 PM #2
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    GasGuzzler
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    Gotta pull the trans to fix that. Check the front pump seal on the trans too.
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  3. 03-21-2009 04:05 PM #3
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    msl85
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    Is there anything else i should look for that could possibly be leaking from around the same area?
    02 chevy 1500 ecsb. 02 lq4 6.0, nelson tuned.(sold but still in the family)

    89 chevy 1500 rcsb -under construction-
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  4. 03-22-2009 12:37 AM #4
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    GasGuzzler
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    Yep...I got smoked by a rear main seal like less than three weeks ago. Got worse after I replaced both the rear main and the front pump seal in the trans. Never left my bay. Pulled the trans again and found the rear cover was leaking. I'll never pull one down to put a RMS in without changing that cover gasket too...

    Possible oil pan too since the block, pan, rear cover all meet at the same two corners.
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  5. 03-23-2009 10:07 PM #5
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    msl85
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    well its not the rear main seal. anyone got any ideas what else it could be? oil pan gasket maybe? any help well help out alot, is my daily driver
    02 chevy 1500 ecsb. 02 lq4 6.0, nelson tuned.(sold but still in the family)

    89 chevy 1500 rcsb -under construction-
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  6. 03-26-2009 11:33 AM #6
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    Oil pan or rear cover gasket. Are you sure it's oil?
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  7. 03-26-2009 07:02 PM #7
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    msl85
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    yeah its for sure oil. leaking like crazy and whole underneath is covered.
    02 chevy 1500 ecsb. 02 lq4 6.0, nelson tuned.(sold but still in the family)

    89 chevy 1500 rcsb -under construction-
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  8. 03-26-2009 07:11 PM #8
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    Does your truck have engine oil cooler lines? Could be the oil filter, filter adapter gasket/o-ring, oil cooler line and/or coupler, rear main seal/rear engine cover(these should always be done together, as previously mentioned), or a transmission front pump seal or torque converter seal. I'm trying to remember if these have an oil pressure sending unit at the rear of the intake, you might look for that too.

    Some shops have engine oil dye and a blacklight. Pour in the dye, start the engine, raise the truck and watch the source of the leak identify itself.

    Good luck on the repair.
    2001 ECSB 4x4, 5.3, Radix, 3.0 pulley, VHP Trucker cam, 216/224 .551/.551 115 lsa, 1.8 Crane roller rockers, 4L65E, Yank SC3000, 3.73, Cal-Tracs, HPTuners.
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  9. 03-26-2009 09:41 PM #9
    RedHeartbeat
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    Check the oil pressure sending unit. They leak after time.
    See my truck data in the "My Garage" section here... http://www.ls1truck.com/forums/my-ga...tml#post191709
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  10. 03-26-2009 09:54 PM #10
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    is ur oil pan cracked?? i just cracked mine really bad it was misaligned when i torqued it down and didnt realize it untill it went CRRRRAAAACCCCKKKK!!!!! really loud lol
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