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<H1>Oil Leak at Oil Cooler to Engine Block Mating Surface (Replace O-Rings, Apply Sealant) #02-06-01-023A - (09/18/2002)</H1></TABLE>Oil Leak At Oil Cooler To Engine Block Mating Surface (Replace O-rings, Apply Sealant )

2001-2003 Chevrolet Silverado 2500/3500 Series Pickup Models

2001-2003 GMC Sierra 2500/3500 Series Pickup Models

2003 Chevrolet Kodiak C4500/5500 Series Models

2003 GMC Topkick C4500/5500 Series Models

with 6.6L Duramax™ Diesel Engine (VIN 1 -- RPO LB7)

This bulletin is being revised to add a model year. Please discard Corporate Bulletin Number 02-06-01-023 (Section 06 -- Engine/Propulsion System).<A name=ss1-958679><A href="http://service.gm.com/servlets/BlobShtml?ShtmlFile=958679&pubid=297&evc=sm#ss1-958679" target="_blank">

Some customers may comment on oil leaks at the engine oil cooler.<A name=ss2-958679><A href="http://service.gm.com/servlets/BlobShtml?ShtmlFile=958679&pubid=297&evc=sm#ss2-958679" target="_blank">

Minor imperfections in the engine block machined surfaces at the oil cooler interface may allow oil seepage past the oil cooler O-rings.<A name=ss3-958679><A href="http://service.gm.com/servlets/BlobShtml?ShtmlFile=958679&pubid=297&evc=sm#ss3-958679" target="_blank">

  1. <LI =1>Inspect for other oil leaks that may be perceived as an oil cooler leak. An oil leak from one of the main bearing cap side bolts may appear to be coming from the oil cooler.
    <LI =1>If the oil cooler is leaking oil, remove the oil cooler from the engine. Use care to remove only the five bolts that hold the oil cooler to the engine block. Refer to the Engine Mechanical sub-section in the appropriate Service Manual.

    <MAP name=870004.map>
    <TH align=left></TH></TR>
    <TD align=middle>(1)</TD>
    <TD align=left>Apply sealer to this area</TD></TR>
    <TD align=middle>(2)</TD>
    <TD align=left>O-rings</TD></TR></T></TABLE>
    <LI =1>Remove the O-rings from the oil cooler and discard the O-rings.
    <LI =1>Clean the mating surfaces of the engine block and the oil cooler.
    <LI =1>Install new O-rings (2) to the oil cooler.
    <LI =1>Apply sealant (1), P/N 97720043, to the oil cooler as shown. Do not apply sealant to the O-ring grooves on the oil cooler.
    <LI =1>Install the oil cooler to the engine. Refer to the Engine Mechanical sub-section in the appropriate Service Manual.
    <LI =1>Allow the vehicle to sit for 8 hours at room temperature to allow the sealant to fully cure before initial startup. </LI>
<A name=ss4-958679><A href="http://service.gm.com/servlets/BlobShtml?ShtmlFile=958679&pubid=297&evc=sm#ss4-958679" target="_blank">
<H5>Parts Information</A></H5>
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Part Number</TH>
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