Register free!
Search
 
     

The Green Industry's Resource Center


Click for Weather
Reply
 
Thread Tools Display Modes
  #1  
Old 09-07-2012, 12:23 AM
Winnipeg Lawns Winnipeg Lawns is offline
LawnSite Senior Member
 
Join Date: May 2011
Location: Winnipeg, Manitoba
Posts: 299
Help to diagnose Oil leak under truck.

My truck is 92 GMC sierra with a 350.. 2 wheel drive.

I have an oil leak, the oil droplet will form right on the oil pan plug nut and drip to the pavement when parked.

I thought it might be the gasket on the nut so I bought one, nothing changed.

I've been told it's might be either a rear oil seal leak or a Oil pan gasket leak.


Here's the thing. I just filled it up with oil and when I park for 20 minutes like 2 cups of oil will leak out.. *when it's parked*.

Once the oil level gets so low that it's not on the dip stick, it will only drip a couple drops but it freaks me out there's no oil. But there is quit a lot left as I took of the plug, thinking it was empty, and lots came out.


So.. Now I'm thinking it's the Pan Gasket and it leaks like crazy till the oil level gets below the gasket level... would this be right? or Would a rear oil seal leak like crazy while parked?


Last edited by Winnipeg Lawns; 09-07-2012 at 12:29 AM.
Reply With Quote
  #2  
Old 09-07-2012, 01:01 AM
CLARK LAWN's Avatar
CLARK LAWN CLARK LAWN is offline
LawnSite Silver Member
 
Join Date: Oct 2005
Location: youngstown, ohio
Posts: 2,519
First thing, power wash it real good. Get all the old oil off then it will be easier to find. Second is that pan looks really rough, you my be putting a new pan on. Lucky those are a dime a dozen and easy to change.
Posted via Mobile Device
Reply With Quote
  #3  
Old 09-07-2012, 05:57 AM
123hotdog's Avatar
123hotdog 123hotdog is offline
LawnSite Senior Member
 
Join Date: Aug 2012
Location: Bristol TN
Posts: 440
I know this sounds strange but I have the same truck and the valve cover gaskets were shot. Its a thought. I don't know if you can get a pressure washer under your truck to pressure wash it. I would replace the valve cover gaskets and the oil pan gasket ( they are cheap ) and thoroughly inspect that oil pan. I'll bet the metal is thin because of road salt. Make sure to clean off the old gasket really good. I don't have to tell you if it is the rear main seal, that the labor is pricey if you don't do it yourself ( I couldn't do it myself ) .
__________________
Licensed and Insured
Operating since 2007
1993 Isuzu NPR dove tail open bed 4cyl diesel
1978 F-350 Dump Truck
1988 Z-71 Chevy 4x4 Meyers Plow
2005 Chevy HD 2500 6.0
2013 61" Bad Boy Outlaw XP 36 Vanguard
2013 54" Bad Boy Outlaw Stander Kawasaki
2014 48" Wright Walk Behind
1995 36" Scag Walk Behind
Reply With Quote
  #4  
Old 09-07-2012, 07:51 AM
nparish's Avatar
nparish nparish is offline
LawnSite Member
 
Join Date: Sep 2012
Location: KCMO
Posts: 53
Use caution anytime you powerwash the underside of a vehicle.
Reply With Quote
  #5  
Old 09-07-2012, 07:52 AM
Pietro's Avatar
Pietro Pietro is offline
LawnSite Senior Member
 
Join Date: Apr 2006
Location: The Garden State
Posts: 829
Just spray some degreaser on it and hose it down. Then get to the autostore and get some trackdye. Its the dye that you add to the crankcase. Then get a cheapo blacklight. Let it sit, and one night check with the blacklight, it will light up the trackdye showing you where the leak is.
__________________
Pete
Reply With Quote
  #6  
Old 09-08-2012, 12:39 AM
hosejockey2002's Avatar
hosejockey2002 hosejockey2002 is offline
LawnSite Bronze Member
 
Join Date: Jun 2002
Location: Auburn, WA
Posts: 1,192
Quote:
Originally Posted by CLARK LAWN
Second is that pan looks really rough, you my be putting a new pan on.
x2. There could be a corrosion caused leak just about anywhere on that pan. If you pull it to replace the gasket, like others have said just replace the pan, they aren't that expensive IIRC.
Reply With Quote
  #7  
Old 09-08-2012, 03:24 AM
Winnipeg Lawns Winnipeg Lawns is offline
LawnSite Senior Member
 
Join Date: May 2011
Location: Winnipeg, Manitoba
Posts: 299
Let me re-ask the question. Can a diagnosis be made of where the oil is leaking from by the fact that it leaks like crazy when I fill it up with oil but stops when the level is just below the dipstick?

Does oil leak from the rear seal when a vehicle is parked like it would if there was a hole in the oil pan?
Reply With Quote
  #8  
Old 09-08-2012, 09:56 AM
CLARK LAWN's Avatar
CLARK LAWN CLARK LAWN is offline
LawnSite Silver Member
 
Join Date: Oct 2005
Location: youngstown, ohio
Posts: 2,519
like i said, clean it up real good then when it starts to leak you can find where it is coming from. i dont think it is the rear main. when the rear main goes there is oil all over everything rear of the engine. without cleaning it and seeing where it is coming from you are just guessing and may be just throwing parts at it but not fixing it.
__________________
www.clarklawn.com

join us on FACEBOOK www.facebook.com/ClarkLawnMaint
Reply With Quote
  #9  
Old 09-08-2012, 12:58 PM
Winnipeg Lawns Winnipeg Lawns is offline
LawnSite Senior Member
 
Join Date: May 2011
Location: Winnipeg, Manitoba
Posts: 299
Well I was quoted $1000 to change the oil pan, LOL!

Apparently it's 6 hours labour. It's the last nail in the coffin for this truck. Lighting problem with trailer, rust on the wheel wells, broken power window on drivers side, lock doesn't work on the passenger side.
Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump





Powered by vBulletin® Version 3.8.6
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Copyright ©1998 - 2012, LawnSite.comô - Moose River Media
All times are GMT -4. The time now is 10:43 AM.

Page generated in 0.08558 seconds with 9 queries