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Username Post: oil pan leak?        (Topic#359609)
rod 
Member #248 Senior Member
Posts: 1735

Loc: kingman,az
Reg: 04-29-00
01-27-20 05:58 AM - Post#2785267    

I have a 2000 Blazer, 2WD with the big V6. it has dripped small drops of oil for years. but now is it is getting worse. I cant tell if it is the rear pan dripping or the rear seal. very tight area, hard to determine.
does the pan have the 'O' ring style gasket? what are the black tubes at the rear of the pan. they have the most 'leaking' oil.
any help will be appreciated.
Thanks Rod in AZ



 




gchemist 
Member #271 Senior Chevytalk Moderator
Posts: 25367
gchemist
Loc: Austin, TX 78748
Reg: 05-09-00
01-27-20 06:06 AM - Post#2785268    
    In response to rod

Is it over the transmission top? If so, then there are other possibilities. Check valve cover rear areas. The upper intake rear area. Finally, the oil pressure sensor. Over time, these areas are prone to leaks too. I've fixed a few. The 4.3 has a one piece rear oil seal. Usually they don't leak. However, old ones do.

On my '96, I fixed an oil cooler line leak. I replaced them. The oil cooler adapter is known to leak too. New o rings on the next oil change will fix it.

'83 Silverardo XST - ZZ4 powered
'95 Jimmy SLT (Bought @131,814)
'96 GMC Jimmy LS Ret. @236651 miles
'08 GMC Acadia 3.6L SLE


 
paulo57509 
Senior Member
Posts: 478

Loc: Tracy, CA
Reg: 07-18-00
01-27-20 07:09 PM - Post#2785316    
    In response to rod

  • rod Said:
I have a 2000 Blazer, 2WD with the big V6. it has dripped small drops of oil for years. but now is it is getting worse. I cant tell if it is the rear pan dripping or the rear seal. very tight area, hard to determine.
does the pan have the 'O' ring style gasket? what are the black tubes at the rear of the pan. they have the most 'leaking' oil.
any help will be appreciated.
Thanks Rod in AZ



My Safari has the same engine.

The cast aluminum pan uses a one-piece molded rubber gasket.

If the oil isn't coming from the top, it could be coming from the pan gasket, rear main seal or the gasket that goes between the engine and the rear main seal "cap".



Those rubber plugs fill the access holes for the oil pan retaining nuts; there's no engine oil behind them. Unless there's a leak back there.



You might try removing the round, metal plug from the bell housing and/or try to remove those rubber plugs (they look kind of hard to remove), and/or remove the starter and use a mirror to get a look back there.

1987 IROC-Z 5.0L
1992 Lumina Euro 3.1L
2003 GMC Safari


 
rod 
Member #248 Senior Member
Posts: 1735

Loc: kingman,az
Reg: 04-29-00
03-29-20 08:20 AM - Post#2789712    
    In response to paulo57509

turns out...the oil filter was leaking past the seal. I bought several Wix filters at the same time. and setting in the garage probably hardened the rubber. I just cranked it a bit tighter. no problem since.
interesting to learn what the black rubber plugs were.
thanks for the replys.
Rod in AZ



 
gchemist 
Member #271 Senior Chevytalk Moderator
Posts: 25367
gchemist
Loc: Austin, TX 78748
Reg: 05-09-00
03-29-20 09:29 AM - Post#2789717    
    In response to rod

If I buy extras on sale, I store them in a sealed bag or air tight container. A lot of humidity here but summers are hot.

'83 Silverardo XST - ZZ4 powered
'95 Jimmy SLT (Bought @131,814)
'96 GMC Jimmy LS Ret. @236651 miles
'08 GMC Acadia 3.6L SLE


 




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