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Question

s-10 oil leak


Sent to Car Experts May 17, 2005 11:08 p.m.
i have a1990 s-10 4x4 with a 4.3 it has the aux. oil filter mounted on the fender. It has been leakin where the lines attach to the block. Any tips on replacin the o-rings and gaskets?
Customer (name blocked for privacy)
Status: Closed   Value: $5   
Answer
May 18, 2005 12:24 a.m. (1 hour and 15 minutes later) 		REPLIED Check Mark

 This is a common failure point that leaks on these engines.  It is a pretty straightforward repair, just unbolt what you see and replace teh gasket behind the mounting boss, as well as the line seals.  there really are no shortcuts that I am aware of.

   You may want to follow and check closely for leaks from the oil cooler lines themselves; we replace a LOT of these in our shop and you will have one end unbolted anyway to reseal the boss.   It seems like about every 4 or 5 years the lines start to leak badly, and need replacement.   If you have 2 line assemblies (engine to filter, and filter to cooler in the radiator) make sure you check them both; as they are prone to leakage as well.

PictureSteve7654  -- Auto Service Technician -- 100% Positive Feedback on 1541 Car Accepts
27 yrs ASE L1 Master Technician, Service manager
Reply to Steve Rapp
Sent May 18, 2005 5:17 p.m. (16 hours and 52 minutes later)
i really appreciate the quick response but its almost impossible to get to the boss.im looking for a response on the easiest possible way to get to the boss cause the front axle is limiting access.
Customer (name blocked for privacy)
Answer
May 18, 2005 5:28 p.m. (11 minutes and 27 seconds later) 		ACCEPTED Check Mark
  < cellSpacing=2 cellPadding=1> < vAlign=top> <>Date: <>June 1990

Corp. Bulletin No: 036102R < cellSpacing=2 cellPadding=1> < vAlign=top> <>Subject: <>ENGINE OIL LEAK AT OIL FILTER ADAPTER BOLTS

< cellSpacing=2 cellPadding=1> < vAlign=top> <>Model and Year: <>1989-91 T TRUCK WITH 4.3L (VIN CODE Z) ENGINECONDITION:

Some 1989-90 and early 1991 T-trucks may exhibit an oil leak at the left rear of the engine coming from the oil filter adapter bolts.

CAUSE:

This condition may be due to the inability of the gasket between the oil filter adapter and engine block to seal properly. This loss of sealing may also result in the adapter bolts losing torque.

CORRECTION:

This condition may be repaired by installing a new oil filter adapter (P/N 10172750) and gasket (P/N 10172754) per the following instructions.

< cellSpacing=2 cellPadding=1> < vAlign=top> <>IMPORTANT: <>Retorquing the bolts with the existing gasket will only result in a temporary fix for the customer.

Parts are currently available from GMSPO.

PROCEDURE:

< cellSpacing=2 cellPadding=1> < vAlign=top> <>1. <>Disconnect negative battery cable and raise vehicle on hoist. < vAlign=top> <>2. <>Remove transfer case and front axle skid plates from vehicle. < vAlign=top> <>3. <>Using a long extension through the opening created by removing the front axle skid plate, remove the remote oil filter adapter line bolt. < vAlign=top> <>4. <>Disconnect the adapter from the engine block by removing both adapter bolts. < vAlign=top> <>5. <>Clean entire block contact area to ensure all old gasket material is removed. < vAlign=top> <>6. <>With the new gasket in place loosely attach the new adapter assembly to the block. It may be helpful to apply a light amount of petroleum jelly to the gasket to hold it in place during installation.

< cellSpacing=2 cellPadding=1> < vAlign=top> <>NOTICE: <>Do not use adhesive to attach the gasket to the adapter, as this can cause gasket damage.

< cellSpacing=2 cellPadding=1> < vAlign=top> <>7. <>Reattach the remote lines to the adapter. Make sure the remote line 0-rings are in place.

< cellSpacing=2 cellPadding=1> < vAlign=top> <>NOTICE: <>Do not overtorque bolts, as this can cause gasket damage.

< cellSpacing=2 cellPadding=1> < vAlign=top> <>8. <>

Torque the remote line bolt to 30-39 N.m (22-29 lbs.ft.) and the adapter bolts to 18- 24 N.m (13-18 lbs.ft.)

Information copyright Alldata
PictureSteve7654  -- Auto Service Technician -- 100% Positive Feedback on 1541 Car Accepts
27 yrs ASE L1 Master Technician, Service manager

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