Torque of CAM sprocket?

HD2424

MEMBER
2003 CHEVROLET SILVERADO
5.3L
V8
4WD
AUTOMATIC
266,000 MILES

I’ve torqued the 3 cam sprocket bolts to 18 foot pounds. I try and turn crank it won’t turn. I loosen cam sprocket bolts snug them up and it turns fine? Why could it be when I torque to 18 foot pounds it will not turn? Cylinder heads are off.

I don’t know if my torque wrench is off, but I can torque the 3 bolts down to 4 foot pounds and it will turn.

Thanks

Monday, October 3rd, 2022 AT 6:18 AM

5 Replies

KEN L

MASTER CERTIFIED MECHANIC
54,137 POSTS

So, there are many different versions of timing chain sets, if you have the wrong one then the engine will not turn over because the clearance between the cam gears the cam thrust plate is not correct.

Here is a video of the job being done so you can see what's going on:

https://youtu.be/QOr3m815pIQ

Please let us know if you need anything else to get the problem fixed.

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Monday, October 3rd, 2022 AT 3:40 PM

HD2424

MEMBER
191 POSTS

I think I figured it out it’s got to be the new cam. I put my old cam back in and it spins fine. I laid the old one next to the new one and it’s slightly different ground in front than the old one. Got on eBay trying to save money. Can you recommend a good stock cam?

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Monday, October 3rd, 2022 AT 3:54 PM

KEN L