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#1
05-10-2016, 11:55 AM
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Help me figure out my bearing squeal 1980 240D
So over the last week I have started hearing a quick chirp of what sounded like a bearing when i was making sharp turns. So i was thinking that a front wheel bearing might be going out.
However, this morning i started to hear the chirp when i would accelerate from a stop at a red light. It was just a short second of chirping. Then i was able to get the chirping to happen when in neutral (manual transmission) and just throttling the engine a little. This will induce the chirping. Could this be a belt that is fooling me? The belts are all in good shape... Can someone help me. I can do any suggested tests to further help the diagnosis.
__________________
 Grey '91 350SDL 214k Dad's car Beige '81 240D 4 Speed 254k SOLD Blue '82 300D 225k SOLD White '95 E300D 46k SOLD Blue '87 190D 2.5 Turbo 315k SOLD Brown '80 240D 4 Speed 716k SOLD Beige '80 300D N/A 119k SOLD Blue '85 300D Model 186k T-Boned 
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#2
05-10-2016, 12:22 PM
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Remove the belts to check. Best way to eliminate the possibility.
__________________
“Whatever story you're telling, it will be more interesting if, at the end you add, "and then everything burst into flames.” ― Brian P. Cleary, You Oughta Know By Now
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#3
05-10-2016, 01:06 PM
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Mike,
Are you saying to replace the belts, or actually just remove them. If i remove them, i will not be able to drive long, because i wont be powering the water pump and dont want to overheat.
__________________
Grey '91 350SDL 214k Dad's car Beige '81 240D 4 Speed 254k SOLD Blue '82 300D 225k SOLD White '95 E300D 46k SOLD Blue '87 190D 2.5 Turbo 315k SOLD Brown '80 240D 4 Speed 716k SOLD Beige '80 300D N/A 119k SOLD Blue '85 300D Model 186k T-Boned
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#4
05-10-2016, 01:32 PM
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Quote:
You might need to manually shut down the engine doing this test depending on the condition of your vacuum system.
__________________
“Whatever story you're telling, it will be more interesting if, at the end you add, "and then everything burst into flames.” ― Brian P. Cleary, You Oughta Know By Now
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#5
05-10-2016, 01:48 PM
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Quote:
__________________
Grey '91 350SDL 214k Dad's car Beige '81 240D 4 Speed 254k SOLD Blue '82 300D 225k SOLD White '95 E300D 46k SOLD Blue '87 190D 2.5 Turbo 315k SOLD Brown '80 240D 4 Speed 716k SOLD Beige '80 300D N/A 119k SOLD Blue '85 300D Model 186k T-Boned
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#6
05-10-2016, 08:21 PM
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Probably a loose or shot vee belt. Tests are simple. With engine off see if you can move the alternator fan blades by hand. You should not be able to.
More important is the belt for the power steering may have issues.Simply because you heard the chirp on sharp corners when the power steering pump was taking a higher Loading. If you take a bar of household soap and rub it on the exposed vee of the belt with the engine off. If the problem stops you have the culprit. Although the treatment of the belt will not last.
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#7
05-11-2016, 07:29 AM
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I had the "bird chirping" under the hood on my 300sd that was driving me crazy. I shot a quick blast of wd40 on the alternator bearing, behind the pulley/fan. That quieted it down for a couple months.
__________________
Mark in MA 05 MB E320CDI 402k Granite Grey Metallic 05 MB E320CDI 267k Black 05 MB E320CDI 232k White 05 MB E320CDI 209k Tectite Grey 99 Dodge 2500 Cummins 5sp 148k 62 Jeep CJ-6 120k
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#8
05-11-2016, 10:35 AM
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Quote:
__________________
1992 W201 190E 1.8 171,000 km - Daily driver 1981 W123 300D ~ 100,000 miles / 160,000 km - project car stripped to the bone 1965 Land Rover Series 2a Station Wagon CIS recovery therapy! 1961 Volvo PV544 Bare metal rat rod-ish thing I'm here to chat about cars and to help others - I'm not here "to always be right" like an internet warrior  Don't leave that there - I'll take it to bits!
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#9
05-11-2016, 08:14 PM
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Quote:
Here is a video that i took with the belts still on, and the car in the driveway. i think it sounds more like a bearing, so i might just start squirting wd40 around, to see if anything specific quiets down. 20160511_174543_zps6vzyn3yw.mp4 Video by arcticathlon | Photobucket 
__________________
Grey '91 350SDL 214k Dad's car Beige '81 240D 4 Speed 254k SOLD Blue '82 300D 225k SOLD White '95 E300D 46k SOLD Blue '87 190D 2.5 Turbo 315k SOLD Brown '80 240D 4 Speed 716k SOLD Beige '80 300D N/A 119k SOLD Blue '85 300D Model 186k T-Boned
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#10
05-11-2016, 09:56 PM
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Definitely belt. Try adjust the PS pump first
__________________
1978 300D, 373,000km 617.912, 711.113 5 speed, 7.5mm superpump, HX30W turbo...many, many years in the making.... 1977 280> 300D - 500,000km+ (to be sold...) 1984 240TD>300TD 121,000 miles, *gone* 1977 250 parts car 1988 Toyota Corona 2.0D *gone* 1975 FJ45>HJ45 1981 200>240D (to be sold...) 1999 Hyundai Lantra 1.6 *gone* 1980s Lansing Bagnall FOER 5.2 Forklift (the Mk2 engine hoist) 2001 Holden Rodeo 4JB1T 2WD 
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#11
05-12-2016, 03:41 AM
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Sorry - I always have trouble seeing photo bucket videos - so I can't check for myself - however
If NZScott says it is the belt I'd believe him and have a look at that first (He's a reliable chap!)
__________________
1992 W201 190E 1.8 171,000 km - Daily driver 1981 W123 300D ~ 100,000 miles / 160,000 km - project car stripped to the bone 1965 Land Rover Series 2a Station Wagon CIS recovery therapy! 1961 Volvo PV544 Bare metal rat rod-ish thing I'm here to chat about cars and to help others - I'm not here "to always be right" like an internet warrior Don't leave that there - I'll take it to bits!
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#12
05-12-2016, 04:56 AM
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Nice to know I have some "street cred" lol
I had a similar problem once, but it turned out to be a bent alternator bracket. Lucky for me I knew a very kind guy via work at the time who had the keys to a engineering shop
__________________
1978 300D, 373,000km 617.912, 711.113 5 speed, 7.5mm superpump, HX30W turbo...many, many years in the making.... 1977 280> 300D - 500,000km+ (to be sold...) 1984 240TD>300TD 121,000 miles, *gone* 1977 250 parts car 1988 Toyota Corona 2.0D *gone* 1975 FJ45>HJ45 1981 200>240D (to be sold...) 1999 Hyundai Lantra 1.6 *gone* 1980s Lansing Bagnall FOER 5.2 Forklift (the Mk2 engine hoist) 2001 Holden Rodeo 4JB1T 2WD
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#13
05-12-2016, 11:49 AM
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After watching the video, it does sound more like belt squeal than alternator bearing.
Also, be very careful where you're spraying WD40, you can easily make the belt squeal worse!
__________________
Mark in MA 05 MB E320CDI 402k Granite Grey Metallic 05 MB E320CDI 267k Black 05 MB E320CDI 232k White 05 MB E320CDI 209k Tectite Grey 99 Dodge 2500 Cummins 5sp 148k 62 Jeep CJ-6 120k
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#14
05-12-2016, 11:53 AM
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Quote:
...I'll say no more!
__________________
1992 W201 190E 1.8 171,000 km - Daily driver 1981 W123 300D ~ 100,000 miles / 160,000 km - project car stripped to the bone 1965 Land Rover Series 2a Station Wagon CIS recovery therapy! 1961 Volvo PV544 Bare metal rat rod-ish thing I'm here to chat about cars and to help others - I'm not here "to always be right" like an internet warrior Don't leave that there - I'll take it to bits!
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#15
05-12-2016, 11:55 AM
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So i think it is belts for sure, and here is what i was able to do this morning before i left for my commute.
I was hearing a faint squeal that was continuous, but very quiet. this was at regular idle. I could not make it squeal just like in the video by throttling, so this is was all i could go by. I sprayed some Belt squeal stuff on the AC compressor belt and it went away instantly. My AC does not work, and i might as well just cut the belt off, until i am ready to fix my AC properly. However, when driving to work, it started to squeal again when i am applying throttle. All the belts are of unknown age, and I think i really just need to replace all of them (except the AC belt). It could be it is another belt that is making the video squeal and the AC belt was also slightly squealing. thanks for all your help so far. Dan
__________________
Grey '91 350SDL 214k Dad's car Beige '81 240D 4 Speed 254k SOLD Blue '82 300D 225k SOLD White '95 E300D 46k SOLD Blue '87 190D 2.5 Turbo 315k SOLD Brown '80 240D 4 Speed 716k SOLD Beige '80 300D N/A 119k SOLD Blue '85 300D Model 186k T-Boned
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