Knocking sound at idle - Defender Source
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  #1  
Old March 11th, 2012, 10:04 PM
slatelacy
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Knocking sound at idle

I recently bought a 94 d90 with 109xxx miles. When I bought it, it had about 250 miles on a brand new Bosch 4.6 installed by the guys at West Coast Rovers. After about 300 miles (and two broken belts) I finally figured out that they never installed the spacer on the crankshaft, causing the whole pulley assembly to move forward. Luckily, Will Tillery fixed that problem, by installing a spacer. The truck seems to run fine at normal Rpms, but at warm idle, which reads at around 800rpms, there is a good deal of vibration and a knocking sound. Any ideas????
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  #2  
Old March 12th, 2012, 01:49 PM
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Ehaust leak? I had a knocking/ticking sound to one side and found a bolt had backed out. I installed a new bolt and the ticking has all gone away. Easiest fixed I could have imagined.
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Old March 12th, 2012, 02:00 PM
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That was a thought, but it sure sounds like its inside the engine itself. Plus, I don't hear it during normal driving. I guess it still could be. I would have hoped after a new engine install, that wouldn't be an issue.
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Old March 12th, 2012, 02:02 PM
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It could also be valve tap as well. an experienced person could tell the difference in sound between valve and exhaust leak. if it's valve, you might have a bad hydraulic lifter or valve spring.
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  #5  
Old March 12th, 2012, 02:04 PM
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that sux, good luck. you want it to be a simple exhaust leak and not something sexier. mine didnt knock at driving speeds either, nor did it overheat. run the engine cold in the pitch dark and look for flashing light maybe too.
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  #6  
Old March 12th, 2012, 03:43 PM
slatelacy
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I'll give it a try. I sure wouldn't think that a brand new engine would have valve problems, but given the fact that they left the spacer off of the crankshaft, anything is possible. Would a valve issue explain the rough vibration at idle?
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  #7  
Old March 12th, 2012, 03:44 PM
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Why didnt you take it back to the people that "built" the engine?
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  #8  
Old March 12th, 2012, 03:56 PM
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I would love too, but they are in Ca and I am in Nc. Long drive.
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  #9  
Old March 12th, 2012, 04:30 PM
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try posting a video with sound on youtube so whe know what your talking about
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  #10  
Old March 12th, 2012, 05:51 PM
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I hope this works.

<iframe width="480" height="360" src="http://www.youtube.com/embed/hnmqoFuARMM?rel=0" frameborder="0" allowfullscreen></iframe>
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  #11  
Old March 12th, 2012, 05:57 PM
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Try this instead.

http://www.youtube.com/v/hnmqoFuARMM
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  #12  
Old March 12th, 2012, 06:03 PM
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Thanks you sir. Computers scare me.
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  #13  
Old March 12th, 2012, 06:04 PM
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There's new and then there's new. Is it new like came from the factory never installed or even run ever before? Or is it new like we took it apart, put all new gaskets and bearings and rings and put it back together new?
Thing is, that if it's the latter, there is a possibility that you are hearing a wrist pin or some other thing that was not discovered in the course of the engine rebuild. If that's the case then I'd have the people who sold you the engine bear the response.
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  #14  
Old March 12th, 2012, 06:18 PM
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Brand new, never installed 4.6L short block, GEMS types 1996-1998. $4750 according to the receipt that I have from West Coast British.
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  #15  
Old March 12th, 2012, 06:47 PM
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youch,

does the knocking instantly go away just slightly above idle? Is the truck a manual or auto? aLso have you checked the oil level and quality? any metal or sparkles in the oil?
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  #16  
Old March 12th, 2012, 07:05 PM
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It does go away just above idle. It is a manual R380. Just did the initial 1k oil change with Mobil 1 15w-50. I had it done at a shop, so I didn't see the oil. I got the truck with about 300 miles on the new motor and broke it in by the book. Never exceeded 3000rpms and varied engine load for the first 1000 miles.
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  #17  
Old March 12th, 2012, 07:32 PM
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I'd be on the phone with those guys first thing tomorrow.
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1966 109 5 door wagon 300Tdi "spermaceti fueled"
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  #18  
Old March 12th, 2012, 08:18 PM
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No expert but sounds like computer not set up for engine. Serious spark and timing issues.

Why does intake plenum still say 3.9? Js
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  #19  
Old March 12th, 2012, 08:30 PM
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I thought that as well. At least that would be an easy fix. I was told that the 3.9 cover was left on the engine to deal with Cali laws for some reason.
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  #20  
Old March 13th, 2012, 04:21 PM
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The sound of the exhaust is a miss fire for sure, as far as the 3.9 intake ? what would you like it to say? your other option is to say 4.2.

Mine still has the 3.9 intake not a problem at all but you do need proper chip to run the 4.6, some use the 4.2 chip Mine is a RPI chip if I remember correctly.

Hard to tell from video the knock sound but you may have better luck from under the truck near the oil pan. you can also take a long screw driver and place the tip on the valve covers etc. and your ear on the other end and listen to see if you can tell if its internal and which side etc.
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