Balance Shaft Caution on 2004-2012 GM 3.5 & 3.7L DOHC …
Balance Shaft Caution on 2004-2012 GM 3.5 & 3.7L
DOHC Engines
The AERA Technical Committee offers the following information cautioning technicians performing
balance shaft service on 2004-2012 GM 3.5 & 3.7L DOHC engines. The balance shafts in these
engines install from the rear of the block and generally are serviced after the engine has been removed
from the vehicle.
The caution expressed involves the disassembly process and observing the components prior to
removing any bolts. The timing gears located on the end of the balance shafts are not keyed to the
shafts and removing the timing gear will most certainly affect the proper gear timing. The timing gears
are not available individually and are sold as part of the each balance shaft assembly. The gears do
have timing marks as shown in the Figure 1 below.
The assemblies should be removed as units after removing the chain tensioner and balance shaft
retaining bolts (two for right side and one for left side). As a note, these are a one use bolt and should
be replaced anytime they are removed. Torque the new bolts to 106 IN/LBS (12 Nm) after installing the
balance shaft assemblies. The timing chain should have 3 discolored links used to correctly time the
assemblies during re-assembly.
Figure 1. Balance Shaft Gear Timing Mark
Refer to the illustration in Figure 2 and steps below to correctly assemble the balance shafts while
noting it will take eleven crankshaft revolutions to realign the links with the timing gear marks.
Page 1 of 2
This information is provided from the best available sources. However, AERA does not assume responsibility for data accuracy or
consequences of its application. Members and others are not authorized to reproduce or distribute this material in any form, or issue it to their
branches, divisions, or subsidiaries, etc. at a different location, without written permission.
? AERA Engine Builders Association. All rights reserved.
Figure 2. Timing Chain Installation
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Rotate the crankshaft until the left hand balance shaft sprocket timing mark (1) is at 12:00
position.
The right hand balance shaft sprocket timing mark (3) should be at 2:30 position.
The crankshaft dowel pin hole (2) is at 11:30, and the crankshaft sprocket mark (4) should be at
4:30 position.
Make sure the 3 timing marks on the sprockets line up with a dark link on the chain.
Every 11 crankshaft rotations, 3 of the 5 dark links on the chain will line up with the timing
marks.
Install the timing chain tensioner and torque the mounting bolts to 89 IN/LBS (10 Nm)
Page 2 of 2
This information is provided from the best available sources. However, AERA does not assume responsibility for data accuracy or
consequences of its application. Members and others are not authorized to reproduce or distribute this material in any form, or issue it to their
branches, divisions, or subsidiaries, etc. at a different location, without written permission.
? AERA Engine Builders Association. All rights reserved.
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