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Old 05-22-2008, 03:26 PM   #1
classicrr
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Default Crunching sound in engine

My disco (99 series 2, 4.0) has recently started to make a metal crunching sound that is most easily heard when you turn the engine off. Sounds like it comes to a crunching halt. You can also slightly hear it when you turn the car on too.

Otherwise the the truck is great. no problems, just this concerning noise. any thoughts?
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Old 05-22-2008, 03:48 PM   #2
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Default Re: Crunching sound in engine

crunching sounds are rarely a good thing. Any idea of what area of the motor it's coming from?
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Old 05-22-2008, 03:51 PM   #3
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Default Re: Crunching sound in engine

Check for clearance around the radiator shroud.
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Old 05-22-2008, 03:54 PM   #4
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Default Re: Crunching sound in engine

my suggestion is something that is spinning.. bad bearing or something.. when it gets up to speed it balances out per se.
u dont hear it at start up cause other noises are going on..
have someone help u listen while u turn it on and off..
but dont worry too much.. if its something major ull find out very soon what it is
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Old 05-23-2008, 10:40 AM   #5
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Default Re: Crunching sound in engine

Slip the serpentine belt off, and let it run without the accessories & have a good listen. After that, If it still exists, I would slide underneath while its running and listen from front of engine to back of trans, as it could be located in there as well. Last summer I found my alternator bearing making a nice crunchy crunchy sound... new bearings and good to go!. Let me know if you need info on bearings for it.
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Old 05-27-2008, 09:13 AM   #6
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Default Re: Crunching sound in engine

thanks for the ideas. will take a a good look at tonight to try an pinpoint it.
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Old 05-27-2008, 12:24 PM   #7
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Default Re: Crunching sound in engine

My favorite noise is a broken flex-plate.

It sounds like a bunch of marbles are bouncing around in the engine.
yikes!
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Old 05-27-2008, 12:55 PM   #8
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Default Re: Crunching sound in engine

Quote:
Originally Posted by JSQ
My favorite noise is a broken flex-plate.

It sounds like a bunch of marbles are bouncing around in the engine.
yikes!
I had one on a small-block Chevy that for all the world sounded like lifter tick.
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Old 05-30-2008, 12:54 PM   #9
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Default Re: Crunching sound in engine

does not seem belt/ancillary realted. Seems to almost come from the transmission hump. But i only really notice it at low speeds and at idle (in drive or park). sounds like th eflex plate might be the winner
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Old 06-03-2008, 11:34 AM   #10
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Default Re: Crunching sound in engine

Could be the insides of a catalytic that have broken up.. Ceramic inside of steel??..
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Old 06-03-2008, 12:08 PM   #11
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Default Re: Crunching sound in engine

How long does it make the sound after the engine stops?
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