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  #1  
Old 04-10-2015, 03:04 PM
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240d "can of bolts" sound - SOLVED: alt housing bolt loose

Hi all - long time lurker (usually in the Porsche section, got a 928 also) but I just purchased a '83 240d a month ago and have run into a new issue that I don't quite know what it might be yet.

In general the car is an automatic that has been in ok running condition. Flattened motor mounts make the car shake fairly violently when parked, but the idle is steady if not exactly smooth. Shifting is also rough but workable, hard but not feeling like it's going to break anything. Other issues have seemed to be either cosmetic or obvious and fixable (wheel bearing on one wheel, minor oil leaks, etc.)

However, after taking a quick jaunt for lunch and fuel today, we got an ugly noise. The drive was ~40 miles total with the stop in the middle for fuel and food. As we got within about three blocks of the house we heard a metallic clang/rattle. At the time it sounded to me like something dragging, exhaust hanger or such. BUT, when we stopped, we still heard the noise. Not unlike a tin can full of bolts. It is *irregular* not lined up exactly with the tempo of the idle, but it does increase if you rev the engine in park. Nothing jumped out at me when I took a quick look under the hood when we got home.

So - I'm hoping it's not something horrible (piston skirts rattling in the oil pan) and maybe something easier like a chain tensioner? No idea where to start looking. I was planning on doing the motor mounts this weekend, but don't want to spend the time if I've got a live grenade on my hands.

These symptoms sound familiar to anyone?

thanks in advance,
Keith


Last edited by uncre8tv; 04-10-2015 at 05:11 PM.
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  #2  
Old 04-10-2015, 03:14 PM
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Check the air cleaner mounts. They are rubber and known to sheer off and let the air cleaner rattle around. The air cleaner mounting bracket is also a known failure item.
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1992 BMW 525i -traded in
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  #3  
Old 04-10-2015, 03:26 PM
dkr dkr is offline
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Diesels generate a lot of vibration. One possibility is you could have something that should be bolted down that is not. I would try pushing everything under the hood back and forth -- alternator, A/C, power steering reservoir, oil filter housing, etc. and see if anything has substantially more play than it should have.

Dkr.
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Old 04-10-2015, 03:33 PM
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I really have good success with a length of rubber tube, hold one end to my good ear and move the other around to find the source of the noise.
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Old 04-10-2015, 03:36 PM
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Thanks guys. Will take another gander when I can finish up work for the day (the joy/curse of working from home.)
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  #6  
Old 04-10-2015, 04:22 PM
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Better fix your motor mounts...they are simple to do and don't cost too much. All sorts of bad things happen when they collapse.
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..I also have a 427 Cobra replica with an aluminum chassis.
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  #7  
Old 04-10-2015, 05:01 PM
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Yep, we bought it and that was the first thing we ordered. Trans mount just got here this week. On the shelf ready to go on:
Front wheel bearings
front rotors
front pads
motor mounts
trans mount

HOWEVER - SOLVED the issue today. A housing bolt on the alternator had worked itself loose (mounts!) and was bouncing against the alternator fan. chirp chirp chirp smack smack smack.

So, yeah, lots of things can go bad with bad mounts!

Sprayed a bunch of engine degreaser, didn't let it sit too long, and then hosed the whole thing off. This allowed me to see the alternator fan as a distinct part instead of just a piece of the great greaseball mess. Now to button that bolt up and powerwash the whole engine bay. Any tips there? (cover the battery and fuse box... anything else?)

Thanks everyone!

edit: Just noticed your signature, t walgamuth - you've got good taste! My garage:
'03 Dodge Cummins 2500 (6spd, 4dr, long bed, laramie) (daily)
'83 240d (auto) (runs, mostly)
'89 928 S4 (5spd) (runs, usually)
'77 Scout II Terra (196 4cyl, 4spd) (not running at the moment)
'00 TJ (4cyl 5spd) (sunny days and snow storms only)
'15 Golf TDi (6spd) (her daily)
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Old 04-10-2015, 09:50 PM
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A running motor is much warmer than it off.
Warm grease comes off much easier.
Purple Power sure works nicely too.
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  #9  
Old 04-10-2015, 11:46 PM
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If you can remove the air cleaner housing and seal the air intake hole int he manifold beneath it when you do the power wash. I'm int he process of cleaning my engine bay and you can get to a lot of stuff much better with the air cleaner out of the way.

And yes, purple power is fantastic. I'm in the process of doing incredible things with it to my 240D's engine bay and interior. I'll post a thread on it in the near future when I'm finished.

- Peter.
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  #10  
Old 04-11-2015, 08:57 AM
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Vacuum pump failure could make rattling noises...
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  #11  
Old 04-11-2015, 11:25 AM
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Quote:
Originally Posted by vstech View Post
Vacuum pump failure could make rattling noises...

Just starting a 240D could make a rattling noise. LOL


Charlie
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  #12  
Old 04-11-2015, 09:13 PM
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Nine years ago, my first alarming rattle on my first 240D was a loose alternator. So bad it had chewed the bottom alternator bolt in two!
But that was much better than the alternative ideas that went through my mind.

Happy Motoring, Mark
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  #13  
Old 04-12-2015, 07:25 AM
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Make sure that bolt has the proper nut AND washer on the back side or you'll be tightening it up again and again and again.
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  #14  
Old 04-12-2015, 11:01 AM
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Quote:
Originally Posted by charmalu View Post
Just starting a 240D could make a rattling noise. LOL


Charlie
Thanks Charlie, that made my day...

Packman

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