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 Old 02-28-2019, 07:03 PM   #1
 
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Default Chain Stretch @ 40K

I'm unclear on how the VVT can cause accelerated chain wear or stretch and failure.

Just had the fun of driving on the highway and having the engine cut out. No warning, no noise, just tach goes to zero and I'm coasting down the hwy. Why coasting I thought later, being in 6th, I should have had engine braking, but no difference in gear or out.

Towed home, pull the valve cover and I'm missing a timing chain! VVT looks brand new. Thus my question. Seems the VVT would just change the relationship between intake and exhaust valves. If it failed, it would just quit working, performance would suck, but how does that cause chain failure?

I guess I missed my chance to catch it early. Somehow with no cats, muffler, lightweight flywheel, stiff motors mounts all around, no interior, .... I didn't hear the increased noise of chain hitting valve cover.

Look forward to getting schooled.
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 Old 02-28-2019, 08:19 PM   #2
 
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Even a failed vvt doesn't normally break the timing chain. You sure your tensioner didn't let go.
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 Old 03-01-2019, 02:50 AM   #3
 
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Stick a magnetic pickup down there and grab the chain. If it broke i would think that the chain was just faulty. If it came off without breaking then maby a bad tentioner and a flailing vvt could throw the chain off .TBH people bend valves and that force usally isnt enuf to break a chain. Was it a oem chain ?

Yey for interference motors GL with the rebuild.
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 Old 03-02-2019, 05:52 PM   #4
 
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The chain had been hitting the valve cover, but the vvt looks brand new. I assume the chain had stretched since it was hitting the cover, but it was broken at a single link. didn't seem to damage anything.

Still trying to figure out if I got lucky and don't need to pull the head. I think I made a home made compression tester, compressed air into the spark plug hole, with a gauge to watch pressure. Looks like 2 or 3 out of 4 cylinders seem to hold quite a bit of pressure, couldn't turn the cams to close the others. Just had a thought I'll try, turn the crank (with just the bolt since I removed that gear) and see if it was just the valves hitting the tdc pistons that wouldn't let me turn them past a certain point.

Still don't see anything that should have caused the failure. Fuel pump looked good. Gears are tight, the tensioner seemed to catch a little, but I think I was just hitting something else. Guides are good....

I'll post up again if I have compression on all 4 cylinders (after I go to church and say a couple prayers), but still trying to figure out how the vvt could do anything like this
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 Old 03-02-2019, 06:19 PM   #5
 
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Turning the crank allowed me to turn the camshafts. Looks like issues on cylinders 1 and 2. Guess I get the fun to pull the head and replace valves.

Any guru advice about how to tell how much to replace? Obviously bend valves, but what about guides, seals, ....? Better safe than sorry, or is it obvious what needs replaced.

I assume even thought it looks great, get the vvt rebuild kit with all the guides, tensioners and vvt....

Thanks, guess I should have waited until after church :-(
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 Old 03-08-2019, 06:13 AM   #6
 
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VVT kit with everything including NEW friction washers.

I'd replace all the pistons with valve holes in the tops too
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 Old 03-08-2019, 11:07 AM   #7
 
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interference engine = damages when the chain quit regardless of how lucky you can be...

Valves are weak so all of the bent one need replacement and the seats will be affected too. New valves or seats = new shim needed for different thickness...
In many cases, piston are just marked a bit and valve guide isn't broken but inspection is needed. If you keep pistons, buff out any thin extruded part that could glow and ignite fuel......
At this point finding spare oe pistons is pretty easy. Anyone with a forged engine may have more than 2-3 good ones. Or i did see a picture of Sp63 showing a hill of oe Speed piston for junk....

read the thread: how to vvt to make it fine at the first time, you don't want to mess with it again. especially about parts that shouldn't be re-used:
-Friction washers
-Crank bolts
-Cams bolts
-Head bolts

i got better sealing results with ''Righ stuff'' silicone than the grey stuff provided with the vvt kit for timing cover and oil pan...
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 Old 03-09-2019, 10:43 AM   #8
 
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Pull the head and post pics!! I would just pull the head and send it to the machine shop and have them tell you the bad news. It could just be a few valves and checking for flatness. As for the block if the pistons arent gouged then maby just take down any burrs and you should be good to go. Washers, gaskets, vvt kit and beer. (Headstuds or bolts if you have oem ones in there)

Remember a used oem head full of valves and buckets only cost 350 or so online like ebay ect so it may be cheaper to get one and have it resurfaced and cleaned depending on what needs replacing.
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 Old 04-15-2019, 02:01 PM   #9
 
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Hello, the situation is not very pleasant, very sorry that everything happened. You're right, these things should be controlled, and try to prevent in advance, if possible.
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