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1G Timing Belt Tightness

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livedsm4g63

15+ Year Contributor
1,214
151
Mar 1, 2008
Auburn Hills, Michigan
Wanting to get your guys thoughts.

I re-timed one of my 4g63 engines and after sitting for a few months I went to place it in the car. After getting placed it in the vehicle I noticed that the timing belt was rather sloppy between the cam gears. Since I just placed the engine in I figured I would rip it back out and check the tensioner. What do you know, the tensioner inner hole for the grenade pin is lower then the outer.

After thinking to myself, I place everything in alignment. Going back to the tensioner I see I can now slide the grenade pin in. Note, when in time, i have more tension between the cam sprockets.

Im was kinda baffled so I ripped off the head to do a valve job, wanted to insure the valves were good. (It was a spare head and I wanted to redo timing anyways.) This has nothing to do with anything. I just got frustrated.

So would there be a reason why at some portions of the cycle you loose tension? Its a new oem tensioner and new pulleys etc.

Thoughts are welcome.
 
Correct, belt slop at rest is normal. The hydraulic tensioner should be spring assisted to prevent slop, but it could be designed to draw extra air in the intake first for quick starting. Who knows

Slop should not be immediate. It should be gradual after more than 15 minutes with engine at rest
 
Same reason you have to hold the cam gears in position while installing the belt. There's certain positions where the force of the valvesprings will rotate the cam. It won't always be slack, just depends on where the engine stops.

Timing belt deflection/tension is measured between the exhaust cam and the tensioner.
 
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