Is it possible?

Thanks

Its possible, but not easy without damaging the alternator. Tried every trick in the book to get my pulley off without using an impact wrench, and it was a no go. Using an electric impact wrench took all of 10 seconds to loosen the nut, and putting it back on was a breeze. Good luck

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96 E300d

Some parts stores have impact wrenches handy. They frequently need to remove pulleys on cores and install them on overhauled units.

Whatever you do, don't ruin your pulley. They are not easy to find.

Alternators with bolt on pulleys have some way to hold the shaft. It will be a Allen socket or a external hex.

If you have a vise, clamp a Allen key short end facing up , place a box wrench over the pulley nut then drop the whole mess on the Allen. Turn the box wrench, the proper direction is clockwise since you are working upside down.

If you don't have a vise, put a long pipe on the Allen then work is against the box wrench.

Great theory. It just happens to be invalid. There are plenty of alternators that don't meet that description.

Not worth the effort. Find an impact wrench. I second the idea of going to a parts store to have it done.

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1977 300d 70k--sold 08
1985 300TD 185k+
1984 307d 126k--sold 8/03
1985 409d 65k--sold 06
1984 300SD 315k--daughter's car
1979 300SD 122k--sold 2/11
1999 Fuso FG Expedition Camper
1993 GMC Sierra 6.5 TD 4x4
1982 Bluebird Wanderlodge CAT 3208--Sold 2/13

NAPA dealers............

We aren't talking about an overrunning alternator pulley that needs a spline drive to remove the pulley or a old style DC generator.

The OP never specified exactly what brand of alternator he has, for alternators in general, my words are based on actual hands on not on theory.

Are there non holdable shafts? Probably. What does the factory manual show for working with your non holdable shafts and what torque rating does it give?

most stores Harbor freight, Wallyworld, Northern Tool... automcparts etc... have a 12v impact wrench for about $30... get one.

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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 190D 2.5Turbo
1987 190D 2.5-5SPEED!!!

1987 300TD
1987 300TD
1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!

I bought my HF 120v impact for about $30.

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1977 300d 70k--sold 08
1985 300TD 185k+
1984 307d 126k--sold 8/03
1985 409d 65k--sold 06
1984 300SD 315k--daughter's car
1979 300SD 122k--sold 2/11
1999 Fuso FG Expedition Camper
1993 GMC Sierra 6.5 TD 4x4
1982 Bluebird Wanderlodge CAT 3208--Sold 2/13

I have Harbor Freight 12 Volt Impact Wrenches in each of my Vehicles.
They are made for changing Wheels/Tires but I have found it is almost as good as Pneumatic Impact Wrench (an I have those at home and have used them at work).

I used one on My Alternator Pulley Nut and it worked the same a Pneumatic Impact.

It speeds up Tire Rotation and gets you off of the sholder of the Road Faster when you need to change a Flat Tire.

It has been over 10 years since I had to drag out My Pneumtic Impact Wrench and then it was the 3/4" drive one. I have been able to use the 12 Volt Harbor Freight ones for all of the other jobs I have done.

Even though it has a Lock Washer when I installed the Pulley Nut I use Loctite.

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84 300D, 82 Volvo 244Gl Diesel

There may be some info on using a Strap Wrench
http://www.peachparts.com/shopforum/diesel-discussion/294656-refreshing-alternator-om617.html

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84 300D, 82 Volvo 244Gl Diesel

I have an HF 12 volt too. It operates by winding up, spinning a while and then whacking. It doesn't seem that powerful. Does yours work like that also, or is mine defective?

__________________
1977 300d 70k--sold 08
1985 300TD 185k+
1984 307d 126k--sold 8/03
1985 409d 65k--sold 06
1984 300SD 315k--daughter's car
1979 300SD 122k--sold 2/11
1999 Fuso FG Expedition Camper
1993 GMC Sierra 6.5 TD 4x4
1982 Bluebird Wanderlodge CAT 3208--Sold 2/13

that's how every 12v impact I've ever seen operates. it's not like an electric or pneumatic, but the whacking is strong, gets the job done.

__________________
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 190D 2.5Turbo
1987 190D 2.5-5SPEED!!!

1987 300TD
1987 300TD
1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!

When I changed the Bosch alternator on my BMW, I did it without an impact.

Just did it very carefully, holding the fan as I recall.

It was 10 years ago, so I dont remember the exact technique, but it WAS possible.

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Current Diesels:
1981 240D (73K)
1982 300CD (169k)
1985 190D (169k)
1991 350SD (113k)
1991 350SD (206k)
1991 300D (228k)
1993 300SD (291k)
1993 300D 2.5T (338k)
1996 Dodge Ram CTD (442k)
1996 Dodge Ram CTD (265k)

Past Diesels:
1983 300D (228K)
1985 300D (233K)