Blown Timing Chain - Team Camaro Tech
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post #1 of 19 (permalink) Old Feb 3rd, 07, 08:50 AM Thread Starter
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Smile Blown Timing Chain

Well... I solved the noisy harmonic balancer problem to uncover yet another "issue".

Following warm-up with the new balancer, I could not resist a full throttle run. I did not make out of first gear when I head a dreadful noise and lost power. I discovered a mess... the timing chain had erupted through the timing chain cover.

Aside from the obvious chain malfunction, could I have introduced some sort of problem when I installed the new balancer? I used an installation tool and all went together rather well.

Also, is there any danger of piston to valve interferences during the meltdown? What are my chances of just replacing the chain and cover and it will work well once again?

Thanks for the help...
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post #2 of 19 (permalink) Old Feb 3rd, 07, 09:25 AM
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Re: Blown Timing Chain

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Originally Posted by Cardfan16 View Post
Well... I solved the noisy harmonic balancer problem to uncover yet another "issue".

Following warm-up with the new balancer, I could not resist a full throttle run. I did not make out of first gear when I head a dreadful noise and lost power. I discovered a mess... the timing chain had erupted through the timing chain cover.

Aside from the obvious chain malfunction, could I have introduced some sort of problem when I installed the new balancer? I used an installation tool and all went together rather well.

Also, is there any danger of piston to valve interferences during the meltdown? What are my chances of just replacing the chain and cover and it will work well once again?

Thanks for the help...
Wit out a doubt there will be some bent valves and damaged pistons and maybre some distorted cylinder walls here and there.

What Timing set up was you using??
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post #3 of 19 (permalink) Old Feb 3rd, 07, 11:20 AM
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Re: Blown Timing Chain

In my opinion it is time for a rebuild.

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post #4 of 19 (permalink) Old Feb 3rd, 07, 12:38 PM
 
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Re: Blown Timing Chain

Hope your valves just kissed your pistons...

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post #5 of 19 (permalink) Old Feb 3rd, 07, 12:47 PM Thread Starter
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Re: Blown Timing Chain

The timing chain was a Cloyes double roller.

I will take a shot at removing the timing chain cover and determine if more damage is evident. Also, I will remove the valve covers and check springs and valve movement while turning the cam gear by hand.

I will probably do an engine replacement with a 383 but for now enjoying the trouble shooting and repair work in my spare time.

BTW... the engine seems to turn over rather easily. I noticed while removing the damper bolt I had to put the car in gear to stop the rotation.
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post #6 of 19 (permalink) Old Feb 3rd, 07, 12:50 PM
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Re: Blown Timing Chain

Quote:
Originally Posted by Cardfan16 View Post
The timing chain was a Cloyes double roller.

I will take a shot at removing the timing chain cover and determine if more damage is evident. Also, I will remove the valve covers and check springs and valve movement while turning the cam gear by hand.

I will probably do an engine replacement with a 383 but for now enjoying the trouble shooting and repair work in my spare time.

BTW... the engine seems to turn over rather easily. I noticed while removing the damper bolt I had to put the car in gear to stop the rotation.
I've never seen one of those chains break on their own, will be interesting to see what you find when you pull the cover off.

Jody


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post #7 of 19 (permalink) Old Feb 3rd, 07, 01:58 PM
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Re: Blown Timing Chain

Before you go to far back the valves off and do a leak down test as this will save you a lot of wasted time if there is a problem.
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post #8 of 19 (permalink) Old Feb 3rd, 07, 02:05 PM
 
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Re: Blown Timing Chain

didnt like EVERYONE tell you to look into the chain???lol...sorry...anyway, its turning over easily because theres no compression in the cylinders whose valves are currently open when they should be closed...maybe you lucked out and it only jumped time...doubt it, but hope springs eternal...
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post #9 of 19 (permalink) Old Feb 3rd, 07, 03:49 PM
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Re: Blown Timing Chain

I wonder if the chain broke because of being at its stree limit due to the new balancer either not absorbing vibration or transferring it to the chain along with the load from the valvetrain already on the chain?

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post #10 of 19 (permalink) Old Feb 3rd, 07, 05:32 PM
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Re: Blown Timing Chain

You found the woodruff key to be missing or damaged from the balancer, right?
Maybe the key for the crank sproket was also missing or damaged.

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post #11 of 19 (permalink) Old Feb 3rd, 07, 05:39 PM
 
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Re: Blown Timing Chain

or maybe a piece of the key went into the chain between it and the gears
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post #12 of 19 (permalink) Old Feb 4th, 07, 02:51 PM Thread Starter
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Re: Blown Timing Chain

I completed the cover removal and inspection. It looks like a piece of the old woodruff key caused the chain to implode.

I may try a new chain and cover or bite the bullet and do a total re-build...
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post #13 of 19 (permalink) Old Feb 4th, 07, 02:55 PM
 
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Re: Blown Timing Chain

you can save alot of time and loosten up all the valves, and then pressurize the cylinders with a cheap compression guage with the valve taken out of the end...you will get some air escaping even with valves that are not bent, but the difference between bent and not bent is huge...pressurize the cylinder and then hit the top of each valve squarely with a rubber mallet...u should hear a huge rush of air...if not, then the valves in that cyl are fragged...
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post #14 of 19 (permalink) Old Feb 4th, 07, 04:02 PM Thread Starter
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Re: Blown Timing Chain

I have a compression tester. Couldn't I use that to determine if there is any valve damage?
I.e: Make sure the valves are closed and rotate the crank...
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post #15 of 19 (permalink) Old Feb 4th, 07, 05:02 PM
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Re: Blown Timing Chain

If you undo the valve adjustment and back off the nuts totally, yes. Otherwise, leaving cam in place with rocker arms tight, some valves will be open and bent valves will happen.

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