Is it possible to put a Electro magnetic clutch on the 602 ( 1991 300D ) engine's radiator fan ? if so does anyone know the cross reference on application or where I could find such a thing ?

Thankyou

Is your viscous clutch bad? Or do you just want to see if it can be done?

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1993 W124 300D 2.5L Turbo, OM602.962
2000 Chevrolet Cavalier, 2.4L DOHC
2002 Ford Explorer, 4.0L SOHC
2005 Toyota Prius, 1.5L

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It is that I am never sure how well the viscous clutch is working at any given time. Basically I disagree with the premise of the operation of such a critical component the function of which is not easily discernible.

Thankyou

The early 190D had a magnetic clutch, '84-??

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Gone to the dark side

- Jeff

My sister's 190E has the magnetic clutch for the fan, but it doesn't work....car does not overheat however. Very strange. The large aux fan does work though, so its safe from overheating even if that becomes an issue.

I much prefer the mechanical fan setup.

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-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)

I have to ask- Why not just use an electric fan? You can even wire it to run any time the key is on, and it'll draw less power than a mechanical one.

I am sure it could be rigged. the shafts are about the same size, I'll play with the 93 I have... I needed something to don on monday anyway...

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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!

You have an electromagnetic clutch on your aircon compressor.
The viscous clutches work for years without problems, when they are done, just replace it.
How could you be sure an electromagnetic one was working?

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Grumpy Old Diesel Owners Club group

I no longer question authority, I annoy authority. More effect, less effort....

1967 230-6 auto parts car. rust bucket.
1980 300D now parts car 800k miles
1984 300D 500k miles
1987 250td 160k miles English import
2001 jeep turbo diesel 130k miles
1998 jeep tdi ~ followed me home. Needs a turbo.
1968 Ford F750 truck. 6-354 diesel conversion.
Other toys ~J.D.,Cat & GM ~ mainly earth moving

By jumping the sensor and watching it engage.

__________________
-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)

its a bit hard to jump the sensor & look at the fan when you are doing 40 down the road.

__________________
Grumpy Old Diesel Owners Club group

I no longer question authority, I annoy authority. More effect, less effort....

1967 230-6 auto parts car. rust bucket.
1980 300D now parts car 800k miles
1984 300D 500k miles
1987 250td 160k miles English import
2001 jeep turbo diesel 130k miles
1998 jeep tdi ~ followed me home. Needs a turbo.
1968 Ford F750 truck. 6-354 diesel conversion.
Other toys ~J.D.,Cat & GM ~ mainly earth moving

Thanks to all for your replies, vstech please do let me know what you find out sounds interesting... also the issue of how a person might check the functional condition of an electromagnet fan is as another poster here said... just jump the sensor and even at idle you will be able to hear and see the magnet clutch engage... straightforward that is what I am searching for as opposed to the viscous coupling.

Thankyou

the only issue i can think of, is that even cold, the visco fan pulls some air. the em clutch would not pull any air. when off...

This is true - but there is no need for any air flow until the engine reaches the desired temp. That said the argument could be made that when the A/C is on it is good to have some air flow over the condensor regardless of road speed. Well this is true and why it is that MB decided in its infinite wisdom to not run the electric fans continuously when the A/C is on ( at least when the vehicle is under a given road speed ) is a mystery to me. This point can be easily remedied by bridging into the electric fan relay ( leaving the OE wiring intact ) and adding a second relay that takes its control signal from the compressor initiate wire or better yet from the ECU signal that powers up the A/C circuit ( if it is practical to find in the heat/A/C ECU labyrinth ) so that the fans would run continuous regardless of weather the compressor clutch was actually engaged. food for thought anyway...

Thankyou

I would think that a fan clutch controlled by a temp switch on the thermostat housing would result in quieter driving and better fuel economy. It takes some umph to keep that fan spinning all the time.

-J

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1991 350SDL. 230,000 miles (new motor @ 150,000). Blown head gasket

Tesla Model 3. 205,000 miles. Been to 48 states!
Past: A fleet of VW TDIs.... including a V10,a Dieselgate Passat, and 2 ECOdiesels.
2014 Cadillac ELR
2013 Fiat 500E.

The reason is two fold

1) the elctric fan pushes the air through and the mechanical fan pulls the air - the two thereby working together when the utmost is needed

2) as cooling is pivotal in wether or not your engine lives or dies - it is not wise to rely on one system alone as any one system can fail.
* I know many manufacturers do it but most of the time they have two separately initiated electric fans and we have here a system that is designed to have both the mechanical and the electric and I do not think it wise to eliminate one as really all systems should have both

Thankyou