Genuine BOSCH Auxilliary Fan

Gave up trying to find a reasonably priced auxilliary fan one day for a 300D I was working on for a customer (A/C work) and decided to take theirs apart.

What I found is that this is a simple and easily repairable pancake motor that has one shortfall.

I've now rebuilt 7 of these and I've found that the bearing they used was not sealed and most are bad.

Here's an old bearing (that's still together, unlike many I've replaced that are in pieces!) next to a new TRULY sealed bearing:



The plain bearing in the magnet housing has been good in all (doesn't have to take the torque or side loading that the main fan bearing does.) So I sourced out a supply of SEALED bearings for this application so I can rebuild the fans as they come in.

The fan I'm selling is one that I purchased at a junkyard for a customers car. It was dis-assy'd, ultrasonically cleaned, armiture polished, plain bearing lubed with hi-temp synthetic motor grease, new sealed SKF bearing installed, re-assy'd and tested. Brushes were "like-new" (not worn to stubs) and it is smooth, tight and quiet. The customer insisted on a new one. When I showed them the bill with MY pricing for the new Bosch fan I installed for him ($202 w/o the screen! That's JUST the part!), he choked, but couldn't complain.

Here's pics of the rebuild process of the fan:








Completed fan:







ASKING $50+Actual Shipping

Will rebuild yours for $25 + shipping.

Attached Thumbnails

         

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1984 300D Turbo - 4-speed manual conversion, mid-level resto

1983 300D - parts car

1979 300TD Auto - Parts car.

1985 300D Auto - Wrecked/Parts.


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"If you don't know where you are going, any road will get you there". Lewis Carrol

Where is BFE(your location). What does a new fan cost...I have a number(3 and maybe more) of fans that need rebuilt...Your price is really a good deal and I will send all of the fans to you in the near future...Jim Harris

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James A. Harris

BFE= "Bum F**k Everywhere" ie; will live any old hick place, but no more cities for me (am rural, but near Boulder, CO.)

"Good" price for a new fan is $174. Dealer price is around $300.

You could also do the build yourself rather than spending the shipping $'s if you have a drill, a way to clean everything really well and a pop-rivet gun and rivets. The bearing is a 6001, but DEMAND a sealed (active rubber seal and not just a metal shield - Designation is 2RS for a double radial shield/seal.)

I can help with tips and such, but it's a straight-forward assy and job that about anyone can do. One thing to be carefull of is the dust from the brushes inside can wreak havoc on your lungs, an evac fan and a breathing mask is encouraged while dis-assy and cleaning.

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1984 300D Turbo - 4-speed manual conversion, mid-level resto

1983 300D - parts car

1979 300TD Auto - Parts car.

1985 300D Auto - Wrecked/Parts.


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"If you don't know where you are going, any road will get you there". Lewis Carrol

TomJ,

Where is a good place to buy bearings? It seems like the internet stores mainly deal in large volume. I tried a local bearing shop and they were asking $16 per bearing. $5 dollars would be reasonable right?

If you have a Applied Industrial Technology store nearby they are an SKF bearing distributor. I have never had any issues purchasing single bearings from them for a good price. I will say we do $100k+ in parts purchases from them a year though (at work).

http://www.applied.com

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Jim

I just want to thank you guys for your help. It's pretty incredible to be a part of this forum.

Darn, just got notice that someone replied to this thread. Yes, Applied, or King Bearing, or even Grainger has/can get the bearings. Don't spend more than $8 on them, more like $5.

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1984 300D Turbo - 4-speed manual conversion, mid-level resto

1983 300D - parts car

1979 300TD Auto - Parts car.

1985 300D Auto - Wrecked/Parts.


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"If you don't know where you are going, any road will get you there". Lewis Carrol

Applied has the 6001 rubber sealed bearing for 15 dolllars and the metal sheilded for 12 dollars.

YIKES!!! That's too much! LMK if you need one soon and I can send send you one for about $10/shipped.

BTW, the metal shielded is just that, shielded, NOT sealed. For a fan exposed to the elements, you want SEALED.

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1984 300D Turbo - 4-speed manual conversion, mid-level resto

1983 300D - parts car

1979 300TD Auto - Parts car.

1985 300D Auto - Wrecked/Parts.


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"If you don't know where you are going, any road will get you there". Lewis Carrol

Damn, I wish I had seen this a few weeks ago....I just replaced the fan on my SD with a working one from a parts car, and threw the old one in the dumpster! I could have fixed it and kept it for a spare.

Oh, well....

Mike

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1979 300 SD
350,000 miles
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1982 300D-gone---sold to a buddy
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1985 300TD
270,000 miles
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1994 E320
not my favorite, but the wife wanted it

www.myspace.com/mikemover
www.myspace.com/openskystudio
www.myspace.com/speedxband
www.myspace.com/openskyseparators
www.myspace.com/doubledrivemusic

TomJ!

Many thanks for your post on repair of that aux fan motor...

I'm in the process of rebuilding mine, and your notes were very useful. As I'm currently suffering with worn brushes, I am hoping to replace them. Have you located a good source for these? They are aporoximately .340" square section, and perhaps 3/4" long, but clearly easily trimmed as necessary.

BTW, my local Sears has a harware 'wall' which includes small bearings. This may be a source for your recommended SKF 6001 unit.

Many thanks in advance, Lou

I was wondering where the brushes might be obtained? Anyone have a specific supplier and part no.? Thanks so much!

Well, having not seen these brushes yet myself, I can possibly give a lead out that may prove useful. The place I work for, likes to use old antiquated equipment they buy cheap @ auction, in their maintenance department. So, being one of the plant electricians we have to find sources for these golden oldies. For a vast variety of brushes on our old DC motors and motorized welders we have found a company called Helwig Carbon. pretty much you tell them what you have, give them some measurements if needed and they usually have it. Might prove useful for the fan motors too, I have one I need to someday rebuild, but have yet to figure out how to get it apart,lol.

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Chris
64 190D R.I.P.
80 240D W/617 engine -for sale
82 240D -for sale

I have at least 4 used working aux fans, from parts cars, in my garage.

Why not just get used aux fans instead of rebuilding them?

The used fans cost no more than $5 each.

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JWJ
1983 MB 300D - > 430,000 miles - Deep Blue - Bilstein Comforts - 0-60 in 24 seconds - 27MPG
1985 MB 300TD (wagon) - > 275,000 miles - Manila Beige - Thule rack - 0-60 in 18 seconds - 22 - 25MPG
Biodiesel, Mobil Delvac 1, and Viton fuel lines!

I know this is an ancient thread, but I just wanted to share a bit if information after attempting this myself. The nut that holds the fan blades to the shaft is left handed threaded, but it is ALSO 20mm, at least on my car. I have never even seen a 20mm socket before, so if you plan on doing this job, you might want to have one on hand. I made due with a SAE wrench - 13/16 I think. You probably wont be able to get a wrench on there.

Thanks for the info on this. If anyone decides to try this and needs help, let me know. Essentially it all disassembles easily, though you need to drill out and replace 4 rivets to replace the bearing that is exposed to the weather. Theres a second bearing inside the housing that I did not try to get out, instead I cleaned it out with electronics cleaner and flooded it with spray lithium grease. Took 3 or 4 hours, although a large portion of that was spent replacing the cord since mine had been spliced. (You can desolder and reuse most of the electrical connectors on these cars, to make nice quality repairs or custom harnesses)