Savana 1/2 Ton Van V8-5.3L VIN T (2003)
Exhaust Manifold: Technical Service Bulletins
Engine - Revised Exhaust Manifold Bolts/Torque Specs.
Subject:
L59, LR4, LM4, LM7, LQ4, LQ9, LS1, LS6 New Exhaust Manifold Bolts and Torque Specifications for GEN III Vortec Engine
# 06-06-02-026 - (12/22/2006)
Models
A new exhaust manifold bolt and torque specification was introduced to the GEN III Vortec(TM) small block V8 engines beginning with the 2004 model
year. When servicing any GEN III Vortec(TM) small block exhaust manifolds, the exhaust manifold bolts should be replaced.
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P/N 11518860 Exhaust Manifold Bolts
Apply a 5 mm (0.2 in) wide bead of high temperature threadlocker to the threads of the exhaust manifold bolts before installing.
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P/N 12345493 - GM High Temperature High Strength Threadlocker (U.S.)
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P/N 10953488 - GM High Temperature High Strength Threadlocker (Canada)
Important:
When tightening the exhaust manifold bolts it should he done with two passes. First tighten the two center bolts on the exhaust manifold. Then
tighten the rest of the bolts alternating from side to side, while working towards the outside bolts.
Install the exhaust manifold bolts. Refer to the following torque sequence:
Tighten
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Tighten to 10 Nm (89 lb in) on the first pass.
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Tighten to 20 Nm (15 lb ft) on the final pass.
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