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  #1  
Old 09-13-2011, 09:29 PM
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Viscous fan cut-in temperature? OM606

Hi,

Does anyone know where I might be able to find out what temperature a viscous fan will begin to couple for an OM606? I've had a good search using search engines but mixed results. Nothing in the FSM about temperature -just how to remove and replace

Or, if someone knows it off the top of their head?

Thanks

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  #2  
Old 09-13-2011, 09:36 PM
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Should be about 100*C at the clutch. I don't know what that registers on the temp gauge.

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87 300D
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  #3  
Old 09-13-2011, 10:30 PM
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They leak and fail pretty frequently. Most of the time you wouldn't notice except for a temperature rise when idling.
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  #4  
Old 09-14-2011, 11:03 AM
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100 is pretty much ball park, my cars needle will stick to 85-90 on the highways and regular driving but will rise to 95-100 in traffic and long red lights.

And when moving off you hear the fan roar (its the same sound a boeing makes when it applies its airbrakes on landing). but as said above, the OM606 clutch is leaky and will fail to operate when it runs low on its fluid - you can refill it will toyota 3000 cst fluid but its not everyones game or you can buy a new one $150 or near - there are some on ebay for 50 but idk if they work like they should.
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  #5  
Old 09-14-2011, 06:00 PM
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My paper FSM for the 602/603 engines says (section 20 - Cooling, page 310) that the bimetallic strip "alters its shape" and opens a valve at approximately 71ºC allowing oil to move from the "storage" chamber to the "working chamber." This engages the clutch. The coolant temperature should be 90-95ºC when this happens.

With the clutch disengaged, the maximum fan speed should be 1000 RPM. Clutch engaged, the fan speed will limit at 3300 RPM. Not that fan RPM is not necessarily the same as engine RPM.

The 606 should be similar.

Jeremy
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Our all-Diesel family
1996 E300D (W210) . .338,000 miles Wife's car
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Total. . . . . . . . . . . . 627,762
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  #6  
Old 09-14-2011, 07:22 PM
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Quote:
Originally Posted by KarTek View Post
They leak and fail pretty frequently. Most of the time you wouldn't notice except for a temperature rise when idling.
ya i jsut changed mine a year ago and looks like its fizzling out again. electric fan is going on next.
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  #7  
Old 09-14-2011, 09:03 PM
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Mine starts engaging at around 95C per the idiot gage.

Where are you from that you have a 93' 606??? Didnt know they made them in Europe that early.
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  #8  
Old 09-14-2011, 10:27 PM
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Hi,

I'm in Sydney Australia. Build date on the front of the engine is dated August 1993 and on the data sticker in the boot is dated April 1993.

This was the first of only five to ever be sold here. There was a bad recession here in AUS at that period and it was seen to be a bit extravagant spending $130,000 AUS.

Having so few makes it a challange at times with mechanics only knowing the 603's 12valves. In fact, I'm not sure what I would do without forums like this!
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  #9  
Old 09-15-2011, 01:33 PM
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Quote:
Originally Posted by Jeremy5848 View Post
My paper FSM for the 602/603 engines says (section 20 - Cooling, page 310) that the bimetallic strip "alters its shape" and opens a valve at approximately 71ºC allowing oil to move from the "storage" chamber to the "working chamber." This engages the clutch. The coolant temperature should be 90-95ºC when this happens.

With the clutch disengaged, the maximum fan speed should be 1000 RPM. Clutch engaged, the fan speed will limit at 3300 RPM. Not that fan RPM is not necessarily the same as engine RPM.

The 606 should be similar.

Jeremy
as the water pump pulley is already spinning overdrive related to the crank pulley - how would we measure that the fan is spinning to 3300 rpm, because its downright scary to watch the fan bend backwards at high rpm.
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  #10  
Old 09-15-2011, 01:44 PM
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Fan speed?

Quote:
Originally Posted by Zulfiqar View Post
as the water pump pulley is already spinning overdrive related to the crank pulley - how would we measure that the fan is spinning to 3300 rpm, because its downright scary to watch the fan bend backwards at high rpm.
An optical tachometer is required, a useful tool that no one on the forum seems to have. Yes, the fan bends. As long as it's bending backwards and not forwards into the radiator! The FSM doesn't say anything about measuring fan speed; I'll have to ask my indy, see if he's ever done anything like that.

Jeremy
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"Buster" in the '95

Our all-Diesel family
1996 E300D (W210) . .338,000 miles Wife's car
2005 E320 CDI . . 113,000 miles My car
Santa Rosa population 176,762 (2022)
Total. . . . . . . . . . . . 627,762
"Oh lord won't you buy me a Mercedes Benz."
-- Janis Joplin, October 1, 1970
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  #11  
Old 09-15-2011, 05:30 PM
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Quote:
Originally Posted by Zulfiqar View Post
100 is pretty much ball park, my cars needle will stick to 85-90 on the highways and regular driving but will rise to 95-100 in traffic and long red lights.

And when moving off you hear the fan roar (its the same sound a boeing makes when it applies its airbrakes on landing). but as said above, the OM606 clutch is leaky and will fail to operate when it runs low on its fluid - you can refill it will toyota 3000 cst fluid but its not everyones game or you can buy a new one $150 or near - there are some on ebay for 50 but idk if they work like they should.
I find odd that that the cat heat up on highways? Mine cool done???
Goes 75 on highways at 70mph?
My thermostat is new and highter, I got a 85 degres thermostat as I am on WVO, this is OK in town, as soon as I take the highway the temperature drop?
Olivier
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Fourth now... Corroded too...
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  #12  
Old 09-15-2011, 08:07 PM
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how can your engine maintain a lower temperature than the thermostat rating, the usual case is that the engine will be 5 degrees celcius higher than the Tstat installed, meaning 85 degree thermostat would force the engine to run at 85 or 90. - Thats what Ive known - I maybe wrong on this.

Im still on the lookout for a 80 degree Wahler thermostat for my car - cant seem to find one though.

btw its a few magnitudes hotter here in texas than in Scotland.
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  #13  
Old 09-15-2011, 08:46 PM
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I'm sure not all the out of spec thermostats are caught by quality control. And we should compare sender resistance and/or IR thermometer readings to verify that the gauge is accurate.

Sixto
87 300D
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  #14  
Old 09-16-2011, 07:15 AM
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Quote:
Originally Posted by Zulfiqar View Post
how can your engine maintain a lower temperature than the thermostat rating, the usual case is that the engine will be 5 degrees celcius higher than the Tstat installed, meaning 85 degree thermostat would force the engine to run at 85 or 90. - Thats what Ive known - I maybe wrong on this.

Im still on the lookout for a 80 degree Wahler thermostat for my car - cant seem to find one though.

btw its a few magnitudes hotter here in texas than in Scotland.
That could be due to the weather indeed? I have no idea? can only guess that the wind enter the engine bay and cool the engine? As the engine as not much load its not burning much fuel? If I am on the traffic light its 85.

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E300TD year 2000. RUSTY SOLD
cost a fortune to maintain on the road
but run well on WVO
Second Merc died due to corrosion ( NOT rust) How can mercedes get away with that for so long?
Third lasted a month then went away...
Fourth now... Corroded too...
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