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  #1  
Old 06-08-2010, 01:11 PM
1985 300D Turbo
 
Join Date: Feb 2010
Location: Florida
Posts: 628
alternator burned up belts what to check

I am guessing My alternator burned up the belts and melted them
The fan belt is melted and the alternator belt is melted and stretched.
Something made a noise under the hood and then there was smoke...I thought I was going to have a car on fire ........ Once the car stopped making the noise, and smoking I drove it home, about 10 blocks, by the time I got home, it looked like it was starting to overheat.....never got to the redline........I popped the hood and turned on the heater....and turned off the car...What do I need to check for damage to make sure I do not get stranded.
How hard will this job be?? For a newbie mechanic??

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  #2  
Old 06-08-2010, 01:46 PM
Stretch's Avatar
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You need to make sure that everything is lined up - the centres of each pully - but it could be that something is stuck and not turning round. Your water pump for example or the distributor. If you can get the belts off check to see that all of the pulleys turn easily (except the one attached to the crank shaft!)
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  #3  
Old 06-08-2010, 01:59 PM
rrgrassi's Avatar
mmmmmm Diesel...
 
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The alternator bearings could have siezed also. I have had that happen before. The alternator belts also spin the water pump.
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13 VW JSW 2.0 TDI 193K, Tuned with DPF and EGR Delete.

91 W124 300D Turbo replaced, Pressure W/G actuator installed. 210K

90 Dodge D250 5.9 Cummins/5 speed. 400K
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  #4  
Old 06-08-2010, 02:06 PM
Stretch's Avatar
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I'm daft

Quote:
Originally Posted by Army View Post
You need to make sure that everything is lined up - the centres of each pully - but it could be that something is stuck and not turning round. Your water pump for example or the distributor. If you can get the belts off check to see that all of the pulleys turn easily (except the one attached to the crank shaft!)
What a stupid thing to say about a diesel! I meant alternator...
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  #5  
Old 06-08-2010, 02:31 PM
RML RML is offline
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Did the battery light come on or did you see it flickering on in the past? This would indicate that the alternator was not turning.

This happened to me also. The bearing was going and then it froze one day and burned up the belt. I should have taken the warning signal and fixed it before it froze.

If you were overheating, the water pump is suspect. Like Army said, spin the pulleys and see if one is frozen in position.
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  #6  
Old 06-08-2010, 03:00 PM
1985 300D Turbo
 
Join Date: Feb 2010
Location: Florida
Posts: 628
300D Alternator

I was having a problem w/ the alternator (I think) a few weeks back But thought I fixed it.
the lights on the dash were all lit up even the fuel lite
the belts seemed tight enough.. I replaced the regulator.. Seemed to solve the problem..That was few weeks ago.

The lites went out,after replacing the regulator....

from time to time I would hear a noise under the hood I guess it sounded like kinda metallic sound I dont know if it was the pully or the bearings...but it sounded like it was coming from the alternator....I guess my fault for not investigating further I dont know how to check anyway......other more pressing problems right now...since I live in florida, you can imagine whats going on....

I think it is overheating because the belts are not there anymore.
I was driving it yesterday and had it sitting idle w/ no signs of overheating the extra fan in the front came on too. That was the first time I ever heard the extra front fan come on
so how hard will this be to replace the alt??? Will I just be cussing the whole time?
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  #7  
Old 06-08-2010, 04:20 PM
rrgrassi's Avatar
mmmmmm Diesel...
 
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With no belts, the waterpump is not spinning. You will burn up the engine running like that.

I cussed the entire time while replacing the alternator. Of course it was in 20 degree weather under a car port...
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70's Southern Pacific #5608 Fairmont A-4 MOW car

13 VW JSW 2.0 TDI 193K, Tuned with DPF and EGR Delete.

91 W124 300D Turbo replaced, Pressure W/G actuator installed. 210K

90 Dodge D250 5.9 Cummins/5 speed. 400K
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  #8  
Old 06-08-2010, 04:53 PM
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Quote:
Originally Posted by newtodiesel View Post
so how hard will this be to replace the alt??? Will I just be cussing the whole time?
Have you reliably confirmed that the alternator was the problem? You will be cussing some more if you replace the alternator only to find that the water pump was the culprit.

Quote:
Originally Posted by newtodiesel View Post
The fan belt is melted and the alternator belt is melted and stretched.
Unless you vehicle has been modified, the fan and alternator (and water pump) are driven by the same belts.
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  #9  
Old 06-08-2010, 05:02 PM
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If the Alternator Bearings are messed up it will be easy to hear and even feel if you spin it by hand.
If it is the Water Pump you may be able to feel it but there would obvious side play in the Water Pump Bearing.
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  #10  
Old 06-08-2010, 06:16 PM
1985 300D Turbo
 
Join Date: Feb 2010
Location: Florida
Posts: 628
thanks all for the replies..will check pullys on water pump and alternator

well we have 90 plus degrees right now and very high humidity...no garage or shade.. 20 degrees sounds kinda good right now

what other damage do I need to check for since one belt broke and the other melted.

Am not driving it now dont want to cause further damage...stopped it as soon as I could drove only for a few blocks to get it home and shut it down right away...the temp guage went just barely above 100 no where near redline usually runs around 80 ish

So.... opinions on "new" "Used" "rebuilt"
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  #11  
Old 06-08-2010, 06:44 PM
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Quote:
Originally Posted by newtodiesel View Post

So.... opinions on "new" "Used" "rebuilt"
You need to diagnose the problem before deciding on a treatment.
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  #12  
Old 06-08-2010, 07:12 PM
1985 300D Turbo
 
Join Date: Feb 2010
Location: Florida
Posts: 628
Alternator 300D 85

OK checked pully's

alternator will not turn by hand....I am not a guy and not as strong as y'all are so how hard should it be to turn??? will not budge by hand... the belt was melted into the pully. Removed the 2 belts

Checked the pully behind the fan blade (that is the water pump right??) it will turn by hand and the blades are not damaged there is no apparent noise in the pully that turned it, not lose or wobbly

So my guess is the alternator locked up and is not working
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  #13  
Old 06-08-2010, 07:26 PM
79Mercy's Avatar
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The alternator should spin free as the wind. You need to replace your belts and alternator with a rebuilt unit or have yours rebuilt by a auto electrical shop. I dont know of any auto electrical shops in jax though.

If you cant get a Bosch rebuilt unit, go for a NAPA unit, I hear they have a pretty good quality rebuilt products. I just got a NAPA rebuilt starter 1000 miles ago and so far so good.
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1985 300TD Turbo Euro-wagon
1979 280CE 225,200 miles
1985 300D Turbo 264,000 miles
1976 240D 190,000 miles
1979 300TD 220,000

GONE but not forgotten
1976 300D 195,300 miles
1983 300D Turbo 175,000 miles

http://i42.photobucket.com/albums/e3...e485-1-2-1.jpg
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  #14  
Old 06-08-2010, 08:04 PM
1985 300D Turbo
 
Join Date: Feb 2010
Location: Florida
Posts: 628
So am I right to think that the bearings froze on the altenator?
will check out nappa for the altenator
the ones on nappa site do not have pullys...can I re use mine?
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  #15  
Old 06-08-2010, 08:14 PM
79Mercy's Avatar
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Yes the bearings locked up, its to be expected after so many years.

Yes most rebuilt alternators come without pulleys, I had to re-use my pulley when I replaced my alternator.

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1985 300TD Turbo Euro-wagon
1979 280CE 225,200 miles
1985 300D Turbo 264,000 miles
1976 240D 190,000 miles
1979 300TD 220,000

GONE but not forgotten
1976 300D 195,300 miles
1983 300D Turbo 175,000 miles

http://i42.photobucket.com/albums/e3...e485-1-2-1.jpg
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