Crankshaft Fit

Tiny
BENIBE
  • MEMBER
  • 2006 HUMMER H3
  • 3.5L
  • 5 CYL
  • 4WD
  • AUTOMATIC
  • 60,000 MILES
Hello, my vehicle listed above crankshaft broke and the part is discontinued. My question is : does the 2007 hummer h3 3.7l crankshaft would fit?
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Wednesday, February 1st, 2017 AT 12:37 AM

6 Replies

Tiny
HMAC300
  • EXPERT
It may, but it probably will not work as it is a different stroke. Your crank can be turned or replaced with a what is called a crank kit either at auto parts or any engine re-builder can handle that.
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Wednesday, February 1st, 2017 AT 7:29 AM
Tiny
BENIBE
  • MEMBER
In both engine mechanical specifications engine manual, stroke is the same. Where did you get the information stroke was different?
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Wednesday, February 1st, 2017 AT 8:10 AM
Tiny
BENIBE
  • MEMBER
Stroke is 4.02 in.
Bore is different but stroke is the same.
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Wednesday, February 1st, 2017 AT 8:14 AM
Tiny
BENIBE
  • MEMBER
Increased bore diameter

Both new engines are based on GM's modular inline engine design, which also serves as the foundation for the award-winning 4.2L I-6 in the Chevrolet Trail Blazer, GMC Envoy and Saab 9-7X. They feature dual overhead camshafts, variable valve timing, electronic throttle control and other features that contribute to high levels of operating efficiency and fuel economy. Balance shafts help ensure smooth operation and reduced vibration of the engines, providing a higher level of refinement.

In addition to their larger displacement - delivered through larger, 3.76-inch (95.5 mm) bores - the 2.9L and 3.7L engines feature improved airflow in and out of the combustion chambers, which helps boost power. They also share additional upgrades and changes, compared to the previous engines:

Larger, 1.52-inch (38.7 mm) intake valves, vs. Previous 1.45-inch (37 mm) intake valves
Larger, 1.32-inch (33.5 mm) exhaust valves, vs. Previous 1.18-inch (30 mm) exhaust valves
Revised camshaft profile optimizes valve lift and duration in accordance with larger valves
Cylinder head airflow increased to match capabilities enabled by larger valves and revised camshaft
New, noise-reducing oiling system uses cylinder wall squirter system enabled by a hole in each connecting rod that delivers a precise oil stream onto the cylinder wall beneath the piston
New aluminum camshaft cover helps reduce noise
Tighter-clearance balance shaft bushings promote quieter operation
New, 2-megabyte power train control module houses new diagnostic information storage
New cartridge-type engine block heater, which fits neatly into a specially machined block orifice; for use with available engine block heater.

This is all the change they made. Crankshaft does not seem to be different. Can anyone confirm?
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Wednesday, February 1st, 2017 AT 8:43 AM
Tiny
STEVE W.
  • EXPERT
Well according to GM they will interchange BUT you have to verify that the crank trigger wheel has the same amount of teeth. 06 was a changeover year, the earlier 3.5s used a gear with 24 teeth, the later 3.7 used 52. Supposedly the 06 used the same 52 tooth gear.
So if the teeth match the crank will work.
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Wednesday, February 1st, 2017 AT 9:13 PM
Tiny
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52 is the right number !
Thank you very much Steve.
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Thursday, February 2nd, 2017 AT 12:52 AM

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