Picture and diagram of How to Replace Belt on GM 3.4L 3400 V6 in cars and minivans
This is the routing of the serpentine belt on the GM 3400 V6 engine.
It is used in many Buick, Pontiac, Chevrolet and Oldsmobile cars.
3400 3.4L V6 GM engine used on many chevy, Buick, Pontiac and Oldsmobile cars belt routing picture diagram.
A friend put on a tension pulley for me. It came off and now the bolt will not screw in?
Maybe the treads are stripped.
Auto Zone gave my husband the wrong diagram thats for this diagram, he got it on the
right way.
The tension pulley on my 3400 is in a different place y is that?
Depending on what year, version of the
engine, the pulleys can be a little different. IE-
an older 3.1L is a little different than the 3100
or 3400.
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Engine Operation
2.2L  3100 / 3400 
3.5L  3800 
4200  4.3L Vortec

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GM 3.4L Engine Belt Routing Diagram