You might try reading the FSM.
maybe that bolt more easily accessible from underneath?1. Remove the engine cooling fan. Refer to Fan Replacement (LH2) on pg 6-1078...
2. Remove the fan bracket to crankshaft balancer bolts.
3. Remove the fan bracket to engine block bolts.
4. Remove the fan bracket from the vehicle.
Lolsapien said:As usual the resident troll was of no help. Besides showing a diagram of where the bolts are, here's what the FSM says: maybe that bolt more easily accessible from underneath?
My FSM says you remove the fan as a first step using a special tool then remove the bolts.nwjones 18, sapien, and 1BadCad, thanks. This helps, actually, because it's the fan which is just the wrong distance from the third bolt which makes it impossible to reach with any of the three short, but different length, extensions, or any of those and a deep socket.
I figured I might have to get underneath it to reach it, but I really don't want to, because that means taking even more apart, and it's plenty funky under there.
Last time I removed a fan from a crankshaft-driven fan clutch, I wound up having to get threaded studs made so I could get it back on because Freightliner didn't expect to have a motorcoach bed constructed around the engine...and I'm not triple-jointed.
Looks like the fan comes off, Friday, as the long serpentine belt will be here, I know I'm on borrowed time, and I have until Sunday afternoon to finish it.
My motivation for getting it done is the 12 MPG of our third car, the '98 Grand Cherokee 5.9L. I really like that truck, but man, is it thirsty.
Hope that helps a little... the torque spec for the bracket bolts is 24 N-m (18 lb-ft). Install loosely to the engine block first and then to the crankshaft balancer to make sure everything lines up, then tighten.Pg 6-1078 said:Fan Replacement (LH2)
Tools Required: J-41240 Fan Clutch Remove and Installer
1. Remove the air cleaner intake duct.
Important: Do not completely remove the fan from the crank adapter shaft.
2. Loosen the fan nut from the crank adapter shaft using J-21240.
3. Remove the fan shroud.
4. Continue to loosen the fan nut and disconnect the fan from the crank adapter shaft.
5. Remove the fan from the vehicle.
1. Install the fan to the vehicle.
2. Connect the fan to the crank adapter shaft.
3. Install the fan shroud.
4. Tighten the fan nut to the crank adapter shaft using J-21240. Tighten the nut to 100 N-m (74 lb-ft).
5. Install the air cleaner intake duct.
According to a GM engineer who used to frequent the forum the HD setup will cool the engine at 100MPH on a 100 degree day with a 100MPH following wind.Nice touch, but I'd wager it could do as well with dual electrics.
Heavy duty cooling also got 2 frontal electrical fans and an optional electric secondary water pump as well as the clutch driven fan... I'll wager it runs a lot cooler than any pure electric fan set up...mckellyb said:Nice touch, but I'd wager it could do as well with dual electrics.