Loose timing chain? - JeepForum.com

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post #1 of 6 Old 07-01-2003, 12:15 PM Thread Starter
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1984 CJ7 
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Loose timing chain?

I have a 1985 CJ-7 with a 258 in it that has 187k on the motor.

Thing runs well, smokes a tad, but i was curious. I have a clanking sound in the front of the engine that i think is a loose timing chain hitting the cover.

Obviously this is a bad thing, but how bad exactly?

Should I just pull the timing cover and inspect the chain? Would a loose chain cause any other problems?

I used to own two CJ's...Perhaps a 3rd is in the future?
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post #2 of 6 Old 07-01-2003, 09:02 PM
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well if it is loose it could jump a tooth or more and then you will have to replace it also if it is loose it is probaly very old and needs replaced b4 it breaks on you. If it breaks you will be verry sorry that you didnt spend $30 on chain and gear set( great possibilty that you will bend a valve or two maby even put a hole in piston in extreme case)

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post #3 of 6 Old 07-01-2003, 10:29 PM
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remove dist cap and turn the engine over via large wrench on harm. balancer nut. once you see the rotor turn, stop and go back counterclockwise....if it takes a while before the rotor starts to turn the other way, you have mucho slacko in chain. I just replaced one on a 258 2 days ago.... If you pull the cover at all (even to just inspect it, go ahead and replace it.) If you have a timming light, you can see if the mark jumps around several degrees.

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post #4 of 6 Old 07-01-2003, 11:19 PM
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I know when I rebuilt my engine I noticed the chain very loose, I'm sure that had something to do with it running poorly

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post #5 of 6 Old 07-02-2003, 11:04 PM
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Don't worry about breking a valve or piston....the 258 isn't an "Interference" type motor (like Honda Preludes were). When the chain goes, the motor simply quits, and no damage is done.

But with 187k, I would bet that it is worn and need replacing.....sounds like it is slapping the cover and it will wear a hole eventually if it is.
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post #6 of 6 Old 07-03-2003, 06:02 AM Thread Starter
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Yeah I'm totally with you 4Wheeler...

That's exactly what i thought it was doing.

I used to own two CJ's...Perhaps a 3rd is in the future?
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