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  #1  
Old 10-07-2008, 01:29 AM
chetwesley's Avatar
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new sound to worry about - 240D manual transmission

I was out for a test drive this evening and when I came home and pulled into my parking spot, I put on the parking break, and with the engine still idling but the transmission in neutral, I noticed that there was a rattling occurring in sync with the speed of the engine idling. It sounded sort of like a distant jackhammer. When I pushed in the clutch and let it out, it went away. Then it came back, I think after I pressed the clutch in and let it out again.

I looked under the hood to see if I could hear where it was coming from. It sounded like it was maybe from behind the engine (I guess where the transmission is), but I am not sure.

I noticed it once earlier when I parked on the side of the street, also I think with the parking break on (can't remember for sure). Also went away that time when I pressed in the clutch pedal.

Any ideas where to start?

Something to note: the exhaust is held on in one spot by bent coat hangers rather than the rubber donuts (temp fix until I get new donuts), but I don't notice any rattling with it otherwise.

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1979 240D w/4 Speed Manual, Light Blue Estimated 225-275K Miles - "Lil' Chugs"
Sold but fondly remembered: 1981 300TD Turbo Tan 235K miles, 1983 300SD Astral Silver 224K miles

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  #2  
Old 10-07-2008, 01:54 AM
Cervan's Avatar
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Location: olympia washington
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Quote:
Originally Posted by chetwesley View Post
I was out for a test drive this evening and when I came home and pulled into my parking spot, I put on the parking break, and with the engine still idling but the transmission in neutral, I noticed that there was a rattling occurring in sync with the speed of the engine idling. It sounded sort of like a distant jackhammer. When I pushed in the clutch and let it out, it went away. Then it came back, I think after I pressed the clutch in and let it out again.

I looked under the hood to see if I could hear where it was coming from. It sounded like it was maybe from behind the engine (I guess where the transmission is), but I am not sure.

I noticed it once earlier when I parked on the side of the street, also I think with the parking break on (can't remember for sure). Also went away that time when I pressed in the clutch pedal.

Any ideas where to start?

Something to note: the exhaust is held on in one spot by bent coat hangers rather than the rubber donuts (temp fix until I get new donuts), but I don't notice any rattling with it otherwise.
i have that sound as well, i belive that its coming from ISB bearing that is getting a little sloppy.
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Have you ever noticed that anybody driving slower than you is an idiot, and anyone going faster than you is a maniac?

As long as they would add one additional commandment for you to keep thy religion to thyself.
George Carlin (Wonder where he is now..)

1981 240d (engine donor 1983 240d) recently rebuilt engine hurray! - No more.. fought a tree and the tree won.

pearl black 1983 240d 4speed (Converted!@$$%) atleast the tranny was rebuilt.
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  #3  
Old 10-07-2008, 02:09 AM
chetwesley's Avatar
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Originally Posted by Cervan View Post
i have that sound as well, i belive that its coming from ISB bearing that is getting a little sloppy.
What is an ISB bearing, and how much should I worry about it?
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1979 240D w/4 Speed Manual, Light Blue Estimated 225-275K Miles - "Lil' Chugs"
Sold but fondly remembered: 1981 300TD Turbo Tan 235K miles, 1983 300SD Astral Silver 224K miles

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  #4  
Old 10-07-2008, 02:44 AM
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Yeah, sounds like a gearbox bearing , mine does it too, has done for a couple of years now , I just sit on the clutch rather than let it hammer away in neutral. Or switch it off .....
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  #5  
Old 10-07-2008, 02:56 AM
chetwesley's Avatar
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Good to know I could be in for years of worrying about this sound
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1979 240D w/4 Speed Manual, Light Blue Estimated 225-275K Miles - "Lil' Chugs"
Sold but fondly remembered: 1981 300TD Turbo Tan 235K miles, 1983 300SD Astral Silver 224K miles

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  #6  
Old 10-07-2008, 05:24 AM
ForcedInduction
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Yes, nothing to worry about, mine makes the exact same sound.

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