2000 Jimmy Waterpump troubles

[RI1470]

I'm looking for a little assistance in getting the water pump seperated from the fan clutch.

I've been using the haynes (24071) manual for the guidance and procudure, it's a little different than my 94 S-10 Pickup - but I can not get the fan clutch off the pully.

Any kind of guidance or assistance to get this apart would be appreciated.

[blazee]

I just did mine. The fan clutch and pulley don't connect together. The end of the water pump shaft is threaded, the clutch screws on to the water pump shaft. The end of the water pump shaft also has 4 bolt holes the pulley attaches to these. Here's a walkthrough I just posted in the Blazer forum:

1)Drain the coolant:

2)Remove the shroud:
7-10 mm bolts

3)Remove the fan and clutch:
There is no need to separate the fan from the clutch. The whole thing threads on to the end of the water pump. I don't know the size, because rather than break out all my wrenches, I just grabbed an 18 inch crescent wrench. Place the wrench on the nut and tap loose with a hammer. the tapping will break it loose. You have to tap it, if you just try to loosen it, the belt won't hold it and the whole thing will turn. After it breaks loose just spin it off.

4)Break loose the bolts holding the pulley on:
4- 13 mm or 1/2" bolts
Just break them loose, don't remove them

5) Remove the serpentine belt

6) Remove the pulley:
Finish removing the bolts holding the pulley and remove the pulley

7) Disconnect the hoses

8) Remove the old pump:
4-14 mm or 9/16" bolts

9) Clean the surface:
Remove all traces of the old gasket.

10) Install new pump:
Apply a bead of blue Permatex around the holes on both sides of the gaskets, put them on the pump and insert the bolts through the holes to hold the gaskets in place. Carefully lower the pump in to position. Thread the bolts into the block and snug them. Then remove the bolts one at a time, add the permatex to the threads, and then reinsert. (only do one at a time so that the pump doesn't shift and disturb the mating surfaces) Then tighten all the bolts.

11) Reinstall everything in reverse.

There will be a lot of air trapped in the system, so after you fill it, get the engine to operating temperature, shut it off, let it cool, then add more. The air trapped in the system can cause your engine to over heat if left unattended.
I suggest filling the system with water only and run it like that for a day or two just to make sure there are no leaks. That way you don't waste your antifreeze if you have to do further repairs.

[RI1470]

Thanks for the tip on the fan / fan clutch assembly - the C Wrench and hammer did the trick. Now if only the water pump had solved my problem. After I got it all back together there was still a major leak so I had to take it in. I don't have the time / skills to track this down quickly enough.

I do have a couple of questions though. When I took the old water pump off, and took out the lower bolt on the drivers side I had a large amount of fluid comming out of the mounting bolt hole, not from around the seal/gasket, but directly out of the threaded hole.

A) How bad of a problem is this? B) Is this somewhat normal? C) Am I looking at the possibility of a cracked Block? I'm just trying to get prepared for what the mechanic might tell me. Thanks again.

Rob

Originally Posted by RI1470

I'm looking for a little assistance in getting the water pump seperated from the fan clutch.

I've been using the haynes (24071) manual for the guidance and procudure, it's a little different than my 94 S-10 Pickup - but I can not get the fan clutch off the pully.

Any kind of guidance or assistance to get this apart would be appreciated.

[blazee]

Water coming from the bolt hole is completely normal, there is no seperation between the bolt hole and the water port, that is why you have to use some type of thread sealer on the bolts.

As far as the leak...is it possible that you didn't get all the old gasket material off? I guess if you already took it in, it doesn't reallly matter anyway, though.

A cracked block is pretty rare. I wouldn't worry about that. There is a possibilty of a leaking intake gasket, though. Intake gasket failure is a common problem, but it usually leaks internally or at the back of the engine.

[blazee]

I just remembered, my new water pump had a tag with it that said some initial leakage from the weep holes is normal and it will clear up. Mine didn't leak so I don't know how much leakage would be considered normal.