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#1
02-27-2008, 07:28 PM
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Bosch Alternator - Brushes Squeaking
I've been trying to track down an annoying squeak from my car for about 6 months. I finally narrowed it down to the alternator.
This afternoon, I removed the alternator from the car and spun it by hand. It squeaked from the back. I figured the bearing was bad, but then I removed the voltage regulator & brush assembly from it, and the squeak stopped! The voltage regulator is only a couple of years old (I replaced it in March '05). When I replaced it, I kept the old one. So, just to see what would happen, I installed the original regulator. It doesn't squeak. Then I put the new one back in. It definitely squeaks. I repeated this about 5 more times just to confirm that the brushes on the new voltage regulator were the cause of the squeak. As a final test, I left the old regulator on and reinstalled the alternator back in the car. Sure enough, no more squeak! While I'm very happy that the squeak is gone, the brushes on the old regulator are almost worn out so this isn't a permanent fix. I'm hesitant to buy a new regulator in case it squeaks too. Is there something I can do about the squeaking brushes? Has anyone else had the same problem?
__________________
 1989 250TD Wagon 5-speed, 160,000mi ::: Dark gray metallic / black cloth 1984 190D-2.2 5-speed, 287,000mi ::: Silver-blue metallic / black MB-tex ::: SOLD 
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#2
02-27-2008, 07:43 PM
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You could gently file/rough up off the surface of the brushes on the new regulator so it "Sets" again on the rings again. Maybe it won't squeak.
__________________
-diesel is not just a fuel, its a way of life-  '15 GLK250 Bluetec 118k - mine - (OC-123,800) '17 Metris(VITO!) - 37k - wifes (OC-41k) '09 Sprinter 3500 Winnebago View - 62k (OC - 67k) '13 ML350 Bluetec - 95k - dad's (OC-98k) '01 SL500 - 103k(km) - dad's (OC-110,000km) '16 E400 4matic Sedan - 148k - Brothers (OC-155k)
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#3
02-28-2008, 06:23 PM
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Go to an electrical automotive or even an appliance rebuilder and get them to supply you a set of brushes of suitable size and spring. They'll be very expensive,(maybe $2.00) and install them in your old or new regulator. Give it a try. If you're up to remonign and replacing the regulator as often as you've done you can certainly manage this. Take your remaining regulator and fit it up similarily and hold for a spare.
__________________
Retired Marine Engineer 2005 E320 CDI 1987 300 Turbo Diesel @ 300,000 kM going 1974 240 D 300,K Miles when given away gone 1970 200 D gone 1969 190 D gone
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#4
02-28-2008, 09:37 PM
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If you do decide to buy a new V-Regulator spend the extra little bit of cash to get a Bosch don't go cheap on strategic parts. For instance things like Glow plugs Bosch---'No Brainer' !
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#5
02-28-2008, 10:17 PM
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Quote:
Turn off the headlights. 
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#6
02-28-2008, 10:27 PM
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you could upgrade your alternator to an 80 amp or to the 115 from a saab 900...
__________________
John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread "as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do! My drivers: 1987 190D 2.5Turbo 1987 560SL convertible 1987 190D 2.5-5SPEED!!!  1987 300TD 2005 Dodge Sprinter 2500 158"WB 1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!
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