Wade T

Hot or cold engine reguardless of weather, the radiator fan will not disengage. This can't be normal. I have driven one other 928 (an 83) and it didn't do this. Between the wimpy sounding exhaust and the roar of the fan, my car sounds like an old pickup truck.

Looked at 928motorsports.com and 928gt.com and don't a replacement.

Any imput would be great.

Thanks.

V8 Man

Hey Wade

What about this ? http://www.928motorsports.com/parts/...eplacement.php

I`m shure buying one of these when it`s time to put the engine in

Dennis Wilson

Wade,

The fan on my 78 US is also locked and appears to have been welded that way. It doesn't make that much noise but that could be due to the 78's have more blades but less pitch.

Dennis

WallyP

It is possible that the clutch has seized, and the two halves are locked together.

You must have just missed the "Fan Clutch, '77-'86, P/N 928.106.112.05" on our web site. Of course, since it costs over $400, buying one isn't too attractive!

You have several choices:
- Live with what you have - noise, lower fuel economy, lower power, but no cost.
- Call Jeannie or Pam at (828) 766-9280 and see if we have a used clutch. A used clutch will be just that - well used. You can often add silicone oil and improve the performance of a used clutch, but the newest used fan clutch is 22 years old...
- Search for a cheap electric fan and adapt it to your car. OK choice if you have more time and expertise than money, but it's not a real simple job to do it right.
- Try to find a used set of S4 fans and adapt them. Still not real easy, more expensive.
- Buy Dave's new twin-screw fan set-up. Best fans, easiest installation, but more expensive. (But a better value than a new fan clutch!)

Hope that this helps.

Jim bailey - 928 International

Turn off the engine and see if you can spin the fan it should have some resistance but after a couple turns it should freewheel. If it has been pinned or welded the fan is been driven much faster than it was designed to be. It should spin about 3,400 rpm then the clutch slips. Reving it to 6,000 might just launch a blade out through the hood The forces /energy increases by the square not linear with speed ...

Imo000

The OEM electric fans from a 2.5L V6 Ford Contour or Mercury Mystique have the same dimesions as the 928 radiator and they are inclose in a shroud too so fitting them would be pretty easy. Being OEM, quality is not much of an issue and there is much more R&D built into them than any afterarket electric fan. AND they are DIRT CHEAP.

Wade T

Jim, it does spin freely - harder at first but then gives a little. Strange thing is, it spins firm, then somewhat lose and back again during a single rotation.

Thanks for the great responses, Wally, v8, Dennis, imo00! I have had terrible luck with electric fans in the past. Most of the problems were, overheating and then fan failure. Looks like i'll try going electric (again) and lose that air ghastly pump in the process.

Probably should upgrade the radiator too since it likes to get hot after 1/2 hour of stop and go traffic - hot meaning the temp needle is 3/4 up..

Imo000

That's why stick with OEM fans (like the Ford untis), unlike the aftermarket fans, they are very durable.

If you only get up to 3/4 in a stop and go traffic, then that's normal. If it gets into the red, then there is something wrong.

Jim bailey - 928 International

Back to the original post ....the fan always spins just spins faster when hot that is how it works.( But never over about 3,400 )The 3/4 mark is usually when the electric front A/C fan kicks in and again is pretty normal. Next time it gets up to the 3/4 mark try putting it in neutral and reving it to 2,500 rpm for a minute or two see if the temp gauge drops....if so then possibly the fan clutch is weak and not spinning fast enough when hot...

PorKen

Sounds like the clutch is OK. The clutch fan lasts for 20+ years, and overall is superior to any electric fan.

You might have the smaller fan pulley (M319, 86mm|3-3/8", standard w/rear air) option. If so, you could try putting in a regular one (106mm|4-3/16").

My '86.5 with a 83C thermostat runs just below mid point normally, but will creep up towards the second line when in traffic, but no higher. The A/C fan controls the upper temp.


thread

dprantl

The smaller pulley (M319) will make the car run cooler. I had it on my former '86 and I loved it. There's no reason to replace it with the standard size unless you are searching for that ever elusive 1-2hp increase.

Dan
'91 928GT S/C 475hp/460lb.ft

Imo000

Here is a pis of the Ford fans. The dimension are the same as the 928 radiator core.