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Drunkace
Dakota Enthusiast
 
4/17/2001
02:47:31
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 Subject: 87 3.9 knock and rattle?
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Message:
What might a rytmic knock at low idle, and a rattle and only high rpm(very offen after easing off hard acceleration)? camshaft? crankshaft?.........bearings? what do you think-thanks
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zach
Unregistered
4/17/2001
16:08:23
| RE: 87 3.9 knock and rattle?
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Message:
Let me know if u find out what it is, I have the
same thing. I just ground the heads and did a
valve job. THe seats of the valves come out of
place really easy. 5 out of 6 exhaust valves
were shot and 1 cracked head on teh one
good one. I f u could also help me on my
truck. im goin to change teh gears to 4.30 and
put a cam in it and headers. help me if u can.
i have a slight sound but im still waitin for the
valves to seat. Let me know?
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Drunkace
Dakota Enthusiast
4/19/2001
03:04:30
| RE: 87 3.9 knock and rattle?
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Message:
I'm a little fuzzy....it makes the same sound after u did all that?
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BlkV6
Dodge Dakota
JOIN HERE
4/26/2002
00:09:24
| RE: 87 3.9 knock and rattle?
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Message:
I have a 97 3.9 and my truck knocks and rattles when it idles but when i give it gas u cant here anything andi was told that it might be my compressor , what do u think?laters
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Aaro
Dodge Dakota
JOIN HERE
4/27/2002
20:06:05
| RE: 87 3.9 knock and rattle?
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Message:
Check the fan clutch , this is common on the 3.9's
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dragrdan
Dodge Dakota
JOIN HERE
4/27/2002
22:54:17
| RE: 87 3.9 knock and rattle?
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Message:
you might also look at the timing chain, there is a tsb on it. the fix is a new chain and gears and a timing chain tensioner
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drunkace
Dodge Dakota
JOIN HERE
4/28/2002
00:41:07
| RE: 87 3.9 knock and rattle?
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Message:
Well, It's been a year since bought my truck/posted this, and I just live with it...has not gotten any worse and still uses a quart of oil every 100-150 miles....has zero leaks though. Milage bites too...12-14mpg. I'm just going to drive it into the ground, then get a new block. It has 128K right now.
Anybody think it's worth fixing at this point?
Also---my honda's ac compressor made a clicking/nocking sound till I cut the belt--AC didn't work anyway. OH, and the fan clutch is A-OK.
Last comment...I tried moving the timming both ways, Knock stayed the same.
Later..
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John Woodington
Dodge Dakota
JOIN HERE
1/02/2004
19:10:00
| RE: 87 3.9 knock and rattle?
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Message:
I know it's been a while from when this post was started but I have the exact same problem as you on my Jeep. I had a few questions about that. First being did you ever get it fixed? If not, did you have an automatic transmission? I'm thinking it boiling down to a few areas. Transmission (torque converter loose maybe) or flywheel loose or maybe even the timing chain loose. Any help would be appreciated.
thanks John
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