[mgarblik]

The parts I had been waiting for finally came today. Spent a couple hours fitting and testing. I have the heavy duty 2747 clutch not the severe duty 2797. Couple of reasons for the choice. The Hayden tech info recommends the severe duty clutch with fan blades of 2.5" pitch or more. That may be why some people are unhappy with this clutch if they are using a 2" pitch or less fan blade. My 6 blade fan has a 2" pitch. The severe duty clutch has so much viscous clutch surface area compared to the heavy duty one, those blades may not offer enough resistance to declutch them. The clutch valve may be functioning but not enough driving force to clear the channels out. Also I bought the heavy duty clutch so less weight would be hanging out front, especially with the 1" spacer I thought I would be using. Turns out, not using the spacer because the factory shroud is made at an angle when installed. About 75% of the blade is in the shroud from the center to the bottom, and about 30% or so is in the shroud at the top half. That's just the way it's made. Fits the radiator and core support prefect. Now I know why the finger guard for the shroud equip[ped cars is 2" longer. It makes sense now. Anyway I ran the clutch everything stock and it stayed de-clutched too long for my taste. Water temp was 200-205 before it really clutched up tight and moved maximum air. When it's clutched, the 19.5" 6 blade fan really moves tons of air and drops the temperature right back to 180. I took the tang out of the fixed slot and rotated it about 5 minutes of clock position as mentioned in an above post and just let the tang rest against the stop outside of the slot clockwise. Put it back together and ran it some more. Now the clutch begins to clutch at 175-180 water temp and I was never able to really get it to clutch all the way up. These were static tests in the driveway. It's in the mid 90's here every day though and I could not get it to run over 180. That was letting it run at a steady 2500 RPM's for about 1/2 hour. I will do some more testing over the next couple weeks with an infra-red heat gun and get some air temps. Happy so far.