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pcdarks
Dodge Dakota
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8/27/2006
11:55:53
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 Subject: timing chain damage
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I have a 94 3.9 v6 and the timing chain has jumped teeth. I don't know how far it has gone other than it won't start and turns over like there is no compression. I still get oil pressure which I believe runs off of the distributor which runs off the cam which must still be turning just not in the right sequence. Did I damage the valves and pistons by being out of time??? I know some engines are designed to not make contact with the two but is this one of them??
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Obio3
Dodge Dakota
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8/27/2006
14:58:45
| RE: timing chain damage
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Message:
You need to read the specks on your engine. Maybe someone in here knows this answer (NO GUESSING). I don't off hand never having had a reason to investigate it. I do know this. If you have overlaping valves then yes. You have a lot of bent valves. Nobody has ever mentioned this problem in here so I really think your ok. My opinion only. I assume you could hear the chain rubbing on metal for some time. I'd be more concerned about the metal that rubbed off the block and dumped into your oil. There are those that run like this a long spell and things seem to be ok or so they say. Far as I'm concerned even if it does run ok dammage had to occure. Common sense says so. I would expect shorter engine life to be the desiding factor.
So many problems .... So little time
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pcdarks
Dodge Dakota
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8/27/2006
16:41:04
| RE: timing chain damage
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Message:
There was no noise or warning except for it running rough two days earlier. It smoothed out then and in hindsight it was probabaly trying to jump a tooth then. I've had a rattle when the engine idles for years but it sounded like it was a clutch issue. I assume it only went one tooth as then I would have no compression. which is the case. No real loud noises when I cranked it over. and if I'm lucky the chain strecth did not deposit alot of metal in the engine. 208,000 by the way. I'll keep posting what I find for future.
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J and J Auto
GenII
8/28/2006
23:03:29
| RE: timing chain damage
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Message:
no they will not hit
new chain sprokets and use the tensioner
just put the damper on 0 and see where the dist
rotor is amed there is a cyl line on the injector
pickup should be near this line
Larry
J&J Auto
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Miker281
Dodge Dakota
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8/29/2006
16:29:33
| RE: timing chain damage
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Message:
Hay guys ive got a 93 with 176,000. My timing gear striped out and the cam stoped. when this happened i lost compression bent all 12 valves and cracked both heads. for me the pistons DID hit the valves. now im installing a new long block. I hope you have better luck than i did. mike
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pcdarks
Dodge Dakota
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8/29/2006
18:43:57
| RE: timing chain damage
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Message:
The timing chain jumped two teeth. The chain was loose enough to take off without removing the cam sprocket. shoud be running tommorrow then I will know if I bent some valves, but all indications ars that they are ok.
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pcdarks
Dodge Dakota
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8/30/2006
22:51:15
| RE: timing chain damage
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Message:
Bad news, the valves are bent, it smokes and runs rough. Oh well, looks like old blue has died. R.I.P., you were a good old boy.
Found a 94 in pretty good shape but with a bad tranny. bought it for less than a rebuilt engine. old blue's tranny will go into it along with many other parts, I guess he'll be an organ donor.
Thanks for all of your input.
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J and J Auto
GenII
8/30/2006
23:45:06
| RE: timing chain damage
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Message:
This is a first I have herd of valve damage in
these motors
I have never seen it happen before
a black cloud must have blowen over you
Larry
J&J Auto
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pcdarks
Dodge Dakota
JOIN HERE
9/01/2006
09:16:32
| RE: timing chain damage
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Message:
Small block Mopar engines are known as "interference" engines. What this means is that if the cam & pistons are not where they are supposed to be, they will collide with serious effects.
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