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Oil Leak


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#1 Jasonsupafly

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Posted 22 November 2010 - 01:13 PM

2001 Z71 5.3

Can anyone tell me from the photo where the oil may be leakng from ? I have started to notice small spots on the driveway.

Thanks in advance !

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#2 ChevyTech77

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Posted 22 November 2010 - 01:15 PM

Very hard to tell by that photo alone but could be rear main bearing seal, seal plate or oil pan.
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#3 twavor

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Posted 22 November 2010 - 01:15 PM

Yep....looks like your starter bolts have started to leak. :rollin:

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#4 coloradoSkiCountry

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Posted 22 November 2010 - 05:11 PM

When was the last time you changed the starter fluid?
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#5 DCSTech

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Posted 22 November 2010 - 05:36 PM

Does the 2001's have the crank position sensor above the starter like the newer ones do.
I know on the GMT900's, oil leaking on the starter bolts is usually coming from the CPS above it.

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#6 twavor

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Posted 22 November 2010 - 06:24 PM

Does the 2001's have the crank position sensor above the starter like the newer ones do.
I know on the GMT900's, oil leaking on the starter bolts is usually coming from the CPS above it.

I've got a '99 on the hoist right now and yep, sure enough the CPS is there above the starter.

Travis
Southern IA farmer and ASE certified master auto technician
'00 Silverado ecsb 4x4, 5.3 and riding on 285's...newest vehicle I've ever owned, loads of fun, and I've got cupholders!
'75 GMC 3/4t 4x4--355, 4spd, 205 t-case, 14 bolt full floater.
Built to haul a load--10+leaves in the rear, 1000lb overload shocks, 5 leaves in the front. Bulletproof and built like a brick sh*thouse!

#7 Jasonsupafly

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Posted 22 November 2010 - 09:50 PM

What's all involved in changing this CPS out if that is where its leaking from ? Is it something that should be left up to a shop ? How much do these run in price ?

Thanks for the replies..

#8 txab

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Posted 22 November 2010 - 10:09 PM

Yep, the CPS is a big culprit for the oil pattern you're seeing

Edited by txab, 22 November 2010 - 10:19 PM.

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