Engine/Transmission (1994 - 1998) Fan blade slop

[stumphumper]

When I grasp the fan blade and pull up there is some movement up and down. I looked in the manual but could not see how this unit is attached to the engine. When I remove the bolts to release the clutch and fan asm. will I then be looking at an idler bearing that can be replaced or will be looking at a shaft going into the engine. Would like to know before I start wrenching. Thanks.

 

[Missouri Mule]

As I recall the shaft goes into a bracket that is bolted to engine next to the timing gear cover.

Here is short version of the instructions from 96 FSM.

1. Disconnect both negative battery cables at batteries. ( don't know why there is nothing electric at fan. )

2. Remove fan shroud bolts, move toward engine.

3. The thermal viscous fan drive unit is attached to fan threaded hub shaft ( this shaft is mounted to a bracket that is bolted to engine as I recall. )

Remove the fan blade/fan drive unit from the fan pulley by turning mounting nut clockwise. Put screwdriver or bar between fan pulley bolts to prevent pulley from rotating( do not unloosen or try take off fan pulley bolts.

4. Remove fan shroud and fan blade/fan drive unit as one item.

5. Remove fan blade to viscous fan drive mounting bolts.

 

[stumphumper]

wowl! someone's up as late as i am. thankyou for the reply. I was thinking that if I took off those fan pulley bolts I'd be able to see a worn bearing in an idler shaft ... but it looks like I'll have to unscrew it from it's mounting asm first. Thanks again, I'll tackle that job this weekend.

 

[MLee]

One big nut attached to the fan hub, and three bolts holding the hub to the block.

With backward turning threads on the nut. (Lefthanded)

 

[stumphumper]

I made a trip to the stealers parts dept. and they provided me a print of the parts required for the fan hub. I could not find this in my big thick truck svc. manual. The fan support (pn 04429660) complete unit is about 6-7 hundred bucks! Thats one expensive idler bearing unit. I am hopeing that I can press out the roller bearing (pn 04429639) and save me some money. Has anyone out there got a better source for parts or have done this job please jump in. Thanks. ken

 

[mwilson]

Please provide your Engine Serial Number, I may have a $40. 00 solution for you.

If you are not comfortable with putting it on here you can PM it to me or e-mail me at

-- email address removed --



Also, Cerb has recently changed his, he will most likely jump in and give you some guidance.



Let me know.



Mike.

 

[mwilson]

Cummins part number is 3910739. Selling right now for $160. 00 or so.



Current NSK equivalent is BD35-12AT12DDU8.



$40. 00 at Motion Industries this summer.



Cerb should be chiming in regarding his experience with pressing it in.



Mike.

 

[stumphumper]

got the bearing on order today. It comes out of Cal. so it will be about 5 days by snail mail. That's ok cus I can do lots of other stuff while waiting for the part. Plus I would like to hear for Cerb because it looks like I will have to pull the hub out of the bearing first before I can press out the bearing. Would like to know if he used a puller or did he put the six longer bolts into the hub and pulled it out that way. Thanks again Mike for you help with that bearing # !! That's the kinda help TDR members are great at... saving $$$.

Ken

 

[cerberusiam]

On the 3rd gens the shaft and hub presses out the front and the bearing presses out the back of the mount. And I mean PRESSES, not some love taps with a light hammer.



You have to somehow hold the mount and and drive that shaft out of the bearing. Be CAREFUL supporting the mount as they will break and then your stuck buying a new one. What is really needed is a bearing puller that allows pulling bearings off a differential, name escapes me at the moment.



Not sure of the 2nd gens use the same setup and press fit. My 1st gens are a LOT looser fitment in that area and work a little differently.