OM603 to OM606 Fan Clutch Mod ???? - Page 3 - PeachParts Mercedes-Benz Forum

a2t · #31 05-11-2009, 07:28 PM

so how do i get "JimF" 's mod on my 87 ?? or am i just F'd?

couple more days driving, it hasnt passed 100C yet. 80-90-100 mph uphill, full throttle, ill keep trying.

you can really HEAR that fan spinning now, sounds like an old chevy blazer. i guess fan speed does make a difference even at hwy speeds.

Bio300TDTdriver · #32 05-11-2009, 11:03 PM

Quote:

Originally Posted by a2t

so how do i get "JimF" 's mod on my 87 ?? or am i just F'd?

couple more days driving, it hasnt passed 100C yet. 80-90-100 mph uphill, full throttle, ill keep trying.

you can really HEAR that fan spinning now, sounds like an old chevy blazer. i guess fan speed does make a difference even at hwy speeds.

100mph uphill and it is not over 100.

You don't need any further mods. Your car will be fine.

gsxr · #33 05-12-2009, 09:46 AM

Quote:

Originally Posted by a2t

so how do i get "JimF" 's mod on my 87 ?? or am i just F'd?

No need, really... just make sure the 3-prong switch is working that triggers the fan at 105°C.

Quote:

Originally Posted by a2t

couple more days driving, it hasnt passed 100C yet. 80-90-100 mph uphill, full throttle, ill keep trying.

Sounds to me like it's fixed!

Quote:

Originally Posted by a2t

you can really HEAR that fan spinning now, sounds like an old chevy blazer.

When engaged, you can tell from outside the car, but not usually inside... unless the metal fan is significantly louder. Perhaps that's one of the benefits of the plastic fan - reduced noise. (?)

Quote:

Originally Posted by a2t

I guess fan speed does make a difference even at hwy speeds.

It absolutely DOES make a difference at freeway speeds! Many people have the misconception that at freeway speeds, the "ram air" effect takes over and the fan isn't required. This is wrong, wrong, wrong... as you have just discovered. I learned the same thing myself back in 1998 when I was chasing down my temp issues, and a new clutch dropped freeway engine temps a solid 5-10°C with no other changes. When the change is this dramatic, the old clutch was likely totally dead, empty of silicone fluid, and just barely freewheeling. You can refill the old clutches, btw, if you really want to save some $$. I fixed two of 'em that way, but the process takes hours.

compu_85 · #34 05-12-2009, 09:51 AM

Quote:

{the fan} absolutely DOES make a difference at freeway speeds! Many people have the misconception that at freeway speeds, the "ram air" effect takes over and the fan isn't required. This is wrong, wrong, wrong...

I noticed the same thing, especially when running the air con! The fan is 100% important to have working under all driving conditions.

-Jason

a2t · #35 05-12-2009, 09:37 PM

yeah good point, plastic fan is probably quieter. But i lost the under hood mat some time ago so maybe thats it.

Running like a top, AC is too cold (smack me twice for saying that in May...) I gotta spin the temp wheel up to 22-24C to keep from freezing my ass off.

I guess with a dead fan clutch at hwy speeds the fan actually impedes airflow since its not spinning fast enough.

Thanks for all help. I *should* be ready for July...knock on aluminum #14 head.

Now all I gotta do is call worldpac and return this useless lower rad hose and go buy new 1 at dealer. B!tch to install that thing but the one in there is a relic. oh yeah and get a new 3 pin for good measure.

Ether · #36 05-26-2009, 07:07 PM

I installed the 606 fan clutch (thanks Paul!) on my 87 SDL yesterday with no modification required.

Can't say that I notice the fan being louder now but it certainly stops much quicker than the replaced clutch when I turn off the engine so I'm sure I'm getting better air flow. Will need some warmer days here in Atlanta before I can tell if it helps keep my running temp below 100.

a2t · #37 05-27-2009, 06:44 PM

and warmer days are ahead

nice 300SDL Joe. Man I want one of those...

I measured rear seats in my 87 300D, yours are about 2-3" wider across. Doubt its enough for 3 car seats across, but I still want 1!!

Ether · #38 05-27-2009, 10:19 PM

Paul,

You tell me when you want to try 3 car seats for fit and I'll swing by.

a2t · #39 05-29-2009, 10:57 AM

thanks man, im sure i can make it work!

i dont know what you'd have to drive to be in a more safe vehicle than a 300 sdl, maybe an H2 or something...that thing is a rolling bank vault

would be good choice for toting around 3 kids.

babymog · #40 05-29-2009, 08:35 PM

An H2 (aka: Housewife Hummer)? You're kidding right? A suburban with square corners, ... and slightly less fuel mileage from the wonderful aerodynamics added to the suburban.

Get a 140 if you want solid.

compu_85 · #41 05-30-2009, 11:57 AM

Ya, and safety technology has improved a lot since 1979. It would be interesting to know how a W126's safety compares to a modern car, or something from the 2000s.

Hit Man X · #42 05-30-2009, 01:13 PM

Hell, even an M103 clutch works on the OM603. I had that setup with the plastic 606 clutch for a while, then I bought my 300sel so I put the proper clutch back there and the 606 on my 603.

I may put a 606 fan blade on my 103 for more flow.

Kurt Smith · #43 06-08-2009, 04:08 PM

I ordered a 603 fan clutch from Parts Express for $104 today. Peter read the part description back to me. Maybe the pricing descrepancy is non-issue now?

gsxr · #44 06-08-2009, 05:36 PM

Quote:

Originally Posted by Kurt Smith

I ordered a 603 fan clutch from Parts Express for $104 today. Peter read the part description back to me. Maybe the pricing descrepancy is non-issue now?

Or possibly it's an aftermarket (non-OEM) brand...? Let us know what arrives, maybe post a photo or two...

Kurt Smith · #45 06-08-2009, 06:18 PM

Baha I got the order confirmation and it is for a 606 and not 603. Also it is Phil and not Peter so there you go. I am traveling in another plane and dimension. sorry