Technical Service Bulletin: 2001-2005 Duramax Head Gasket Markings
Reference Number(s): 07-06-01-009A, Date of Issue: November 02, 2009
|Affected Model(s):||2001-2005 Chevrolet Silverado; 2003-2005 Chevrolet Kodiak C4500/5500 Series; 2001-2005 GMC Sierra; 2003-2005 GMC TopKick C4500/5500 Series; with 6.6L Duramax® Diesel Engine (VINs D, 1, 2 – RPOs LB7, LLY)|
|Supercedes:||This bulletin is being revised to remove the Warranty Information and update the Parts Information. Please discard Corporate Bulletin Number 07-06-01-009 (Section 06 – Engine/Engine Mechanical).|
6.6L LB7, LLY DURAMAX® DIESEL ENGINE CYLINDER HEAD GASKET MISSING THICKNESS GRADE MARKINGS – INSPECT BLOCK FOR STAMPINGS
A small number of remanufactured engines were built using oversized bore or milled deck gaskets that do not have any thickness grade identification markings. These engines may show up in any model year from 2001-2005 if the vehicle has received an engine replacement.
Inspect the block for stampings (1) indicating cylinder overbore and a milled deck. The overbore gasket accommodates all cylinder bores from 0.010-0.030″. All blocks that are milled are also over-bored.
|Stamped ID||Cylinder Bore Size (in)||Top Deck (STD or Milled)|
Crimped Construction Style Head Gasket
First generation head gasket crimped construction (1).
Riveted Construction Style Head Gasket
Second generation head gasket riveted construction (1).
Cylinder Head Bolt Torque Specification For Crimped Construction Head Gasket
Refer to Cylinder Head Replacement in SI. Tighten the cylinder head bolts in the following steps using the sequence below:
- Tighten the M12 bolts a first pass to 50 N.m (37 lb ft).
- Tighten the M12 bolts a second pass to 80 N.m (59 lb ft).
- Tighten the M12 bolts a third pass to 90 degrees, using Torque Angle Meter J 45059.
- Tighten the M12 bolts a final pass to 75 degrees, using Torque Angle Meter J 45059.
- Tighten the M8 bolts to 25 N.m (18 lb ft).
Crimped Cylinder Head Gasket Parts Information
|98040128||Gasket, Cyl Hd, (Oversize Bore) – RH||1|
|97358465||Gasket, Cyl Hd, (Oversize Bore and Milled Deck) – RH||1|
|98040130||Gasket, Cyl Hd, (Oversize Bore) – LH||1|
|97358466||Gasket, Cyl Hd, (Oversize Bore and Milled Deck) – LH||1|