V6 Discussion and questions about the base carbureted or MPFI V6's and the rare SFI Turbo V6.

Timing Chain Snapped (Bent Valves?)

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Old Jul 26, 2006 | 11:30 PM
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White_russian5's Avatar
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Timing Chain Snapped (Bent Valves?)

My timing chain snapped recently I was cranking down the road at 35 I lightly accelerated and the thing snapped I rolled it into a parking lot and tried cranking it it wouldnt start had it towed home took it all apart got the new timing chain and waiting on a water pump gasket. Now what I am wondering would I have any bent valves? I also wanted to make sure that I have the crank and the cam alligned the way I was told to do it is turn the crank so that the little guide notch is up and the little notch on the cam is facing down I really hope I get a reply before I put it all back together and fudge it all up again.
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Old Jul 26, 2006 | 11:39 PM
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daves12secV6's Avatar
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From: Sayreville NJ
the v6's are non interference engines so u shouldnt have any bent valves,
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Old Jul 27, 2006 | 08:05 AM
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From: South Florida (NW_Broward)
Car: 1989 Firebird
Engine: 2.8L V6 MPFI
Transmission: Beat to heck 700R4
You don't have any valve problems as a result.

Find out where the dizzy is pointed, then rotate the engine until that cylinder is at TDC on the *COMPRESSION* stroke. Real easy to see if you pull the valve covers and ID the intake/exhaust lifters. That'll get you close. Now move the cam until the timing mark is down, that'll set your cam at #1 TDC. If you watch the valves you should see the progression. Its possible to set this to #1 TDC on the exhaust stroke, so make sure.

Then simply rotate the engine until the #1 piston is at TDC - your timing mark should be UP. If its any other direction, then your not on the piston compression stroke, go to the next upwards motion - which should now be UP. Get the chain on and button her up.
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Old Jul 27, 2006 | 05:03 PM
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I was told to align the two notches on the crank and the cam gears so they match up to the notches of tensioner here's a pic to show what I mean is this not correct?


Originally Posted by bobdole369
You don't have any valve problems as a result.

Find out where the dizzy is pointed, then rotate the engine until that cylinder is at TDC on the *COMPRESSION* stroke. Real easy to see if you pull the valve covers and ID the intake/exhaust lifters. That'll get you close. Now move the cam until the timing mark is down, that'll set your cam at #1 TDC. If you watch the valves you should see the progression. Its possible to set this to #1 TDC on the exhaust stroke, so make sure.

Then simply rotate the engine until the #1 piston is at TDC - your timing mark should be UP. If its any other direction, then your not on the piston compression stroke, go to the next upwards motion - which should now be UP. Get the chain on and button her up.
Reply
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