617 fan - Page 3 - PeachParts Mercedes-Benz Forum

BenzTurbo · #31 09-30-2014, 11:41 PM

Quote:

Originally Posted by t walgamuth

Depends which side you are looking from.

lol exactly!

Stretch · #32 10-01-2014, 01:25 AM

Engine cooling by fan isn't always necessary or desirable. It largely depends on the ambient temperature. For example here in Holland I can drive even in heavy traffic in the winter time without an engine cooling fan. I've "made it" through many winters like this at first keeping a very paranoid eye on the temperature gauge and eventually relaxing.

By the time we get a semi-warm summer I've noticed that an electric cooling fan is used only occasionally under normal driving. It is quite apparent that if you race about (or start towing things) the engine requires the extra cooling. Here in Holland where generally speaking high engine revs happen at higher road speeds you get enough of the ram air effect - air flowing through the engine bay cooling as it goes - for the majority of the year.

Driving in other parts of the world with higher ambient air temperatures is different - for example there is no way I'd drive down to the South of France in the summer time without a reliable cooling fan fitted to an engine. However, in winter time in the north a continuously running cooling fan could over cool the engine. People put things in front of the their radiator grills in cold weather to stop the ram air effect and to help their engines get warm!

For the reason of location and my normal use I prefer electric fans because they are intelligent - they switch on when cooling is necessary. The viscous clutched cooling fan is like a jerk who just won't stop pushing.

interzonearts · #33 10-01-2014, 01:44 PM

Quote:

Originally Posted by Stretch

The viscous clutched cooling fan is like a jerk who just won't stop pushing.

Be it as it may, are there viscous clutches that are consider better than others?

Stretch · #34 10-01-2014, 04:12 PM

Quote:

Originally Posted by interzonearts

Be it as it may, are there viscous clutches that are consider better than others?

Er sorry - back to the point of the thread - as far as I know there are no better or worse viscous cooling fans within the Mercedes stable.

eatont9999 · #35 10-01-2014, 04:54 PM

Quote:

Originally Posted by Stretch

Er sorry - back to the point of the thread - as far as I know there are no better or worse viscous cooling fans within the Mercedes stable.

Well, I wouldn't buy a Uro made fan clutch. Stick with OEM and the correct part for the car - is my advice.

leathermang · #36 10-02-2014, 12:25 PM

Quote:

Originally Posted by Stretch

Engine cooling by fan isn't always necessary or desirable. It largely depends on the ambient temperature....

The items you keep talking about are not the only ones determining the cooling ... or heating... as it needs to be a certain hot to function correctly....
The MB water thermostat is a sophisticated design.... which is one reason people needing max cooling should not take it out of the system.... as might be ok with less sophisticated engines...

BillGrissom · #37 10-02-2014, 03:41 PM

I bought a thermal clutch on ebay a year ago for $38, and has been working fine. I saw other prices >$100. PN 10957836, with no manufacturer listed. Perhaps the secret night shift at the Chinese Bosch factory.

update:
I just ran across a post I made at the time and filed away:
www.peachparts.com/shopforum/diesel-discussion/346702-fan-clutch-change.html

I try to post all my repairs, to give others ideas and archive for myself, though that seems to tick off a few people here. Your car, decide what you want to do and care to pay.

MBeige · #38 10-02-2014, 04:20 PM

Quote:

Originally Posted by interzonearts

I'm about to start making a shroud for the fan but i noticed that the fan clutch may be going out - it squeaks. I remember reading somewhere here that the fan could be upgraded to 606 or something like that.

Should the coupling be upgraded to a newer model as well? And is the newer fan the same diameter?

Did the same a while back:

Fan clutch Metal vs Plastic??

Quote:

Originally Posted by MBeige

When I replaced the clutch on my '83 300D, I replaced the fan as well because it started to show cracks on one of the blades. Reason for changing the clutch was overcooling (clutch was seized).

Here is what I purchased:

000-200-04-22 Fan Clutch (Behr)
110-200-03-23 9-Bladed Plastic Fan

Prior to this the clutch on my car was seized, leading to overcooling.

Stretch · #39 10-03-2014, 02:26 AM

Quote:

Originally Posted by eatont9999

Well, I wouldn't buy a Uro made fan clutch. Stick with OEM and the correct part for the car - is my advice.

I should have been clearer by specifying the ones fitted by Mercedes within the Mercedes stable...

Quote:

Originally Posted by leathermang

The items you keep talking about are not the only ones determining the cooling ... or heating... as it needs to be a certain hot to function correctly....
The MB water thermostat is a sophisticated design.... which is one reason people needing max cooling should not take it out of the system.... as might be ok with less sophisticated engines...

The subject of the thread is viscous cooling fans - I feel I broadened the subject enough by suggesting an intelligent electric solution.

I decided against a full on in-depth discussion about the heat engines (Heat engine - Wikipedia, the free encyclopedia).

I decided not to broaden the subject by comparing the much larger (volumetric) oil and coolant quantities within a Mercedes system and that of other manufacturer's.

I refrained from discussing the inner workings of the OM617 cooling system, block heaters and glow plugs. It just didn't seem relevant to me.

leathermang · #40 10-03-2014, 11:28 AM

So you are going to be precise about what others include in their answers... but you totally leave ' viscous fan ' question ..because you want to talk about electric fans... . and that is just fine... LOL
A lot of justification going on there... ever heard the one about ' glass house dwellers'?

interzonearts · #41 10-03-2014, 02:27 PM

Quote:

Originally Posted by MBeige

Did the same a while back:

Fan clutch Metal vs Plastic??

Prior to this the clutch on my car was seized, leading to overcooling.

How did it work for you?

Simpler=Better · #42 10-03-2014, 03:05 PM

Switched from a mechanical fan to eb*y electric in my gas 2.5L DD. The fan only comes on when revving at low speeds(1st gear moving stuff around the yard), hot summer days idling, or excessive idling otherwise. 97% of the time the fan doesn't come on, and my ultragauge reads out 180*-195*F.

Driving to work(20miles), with stoplights and the whole bit, even with a trailer it doesn't get hot enough to engage the fan.

MBeige · #43 10-04-2014, 01:44 AM

Quote:

Originally Posted by interzonearts

How did it work for you?

Compared to the previous situation with overcooling, I'm happier the engine temp is back to 85 - 90 deg C range (it would previously dip below 80 C with a seized clutch + 9 bladed plastic fan).

The plastic fan was cracked so I opted to buy a new one.