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Author Topic: 4.0 I6: Changing a water pump  (Read 5789 times)

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dxmedia

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4.0 I6: Changing a water pump
« on: February 17, 2009, 10:29:36 AM »

Had to do this because of a leak (the bottom of the bottom hose was dripping due to a leak at the gasket on the bottom of the water pump), so I thought I'd put a quick how to incase anyone else needs to in the future (and doesn't know how)

Local factors did the water pump and gasket for £35 all in.

1/ Loosen the nut holding the top bolt on the alternator.
2/ Loosen the adjustor on the alternator and slip the serpentine belt off the power steering pump

3/ Undo the 16mm pipe fitting for the power steering pump, unclip the plug from the top of the pump
4/ Undo the spring clip holding on the power steering pump return pipe
5/ With a bolt in hand, pull the rubber pipe off the power steering return pipe and block the rubber pipe with the bolt to stop the fluid being lost

6/ Undo the 2 13mm bolts holding on the plastic shrowd over the fan.
7/ With a long big flat screw driver to jam between the nut and the fan to stop the viscous unit spinning and with a 13mm ratchet spanner, undo the 4 nuts holding on the whole viscous unit (NOT the 4 bolts holding on the fan)
8/ In one go, lift the fan and the shrowd out of the engine bay watching that the fan doesn't hit the rad
9/ Take off the serpintine belt
10/ Take off the pulley from the front of the water pump (it's loose now)
11 / Undo the 15mm bolt on the idler next to the alternator and take it off

12/ With a long reach socket undo the 3 long 13mm bolts holding on the power steering pump
13/ Lift the power steering pump out to one side
14/ Undo the 3 bolts holding on the braket for the power steering pump

15/ Undo the spring clip by the no/1 spark plug for the water pipe heading to the water pump.
16/ Undo the spring clip holding the bottom hose to the water pump.

17/ Undo the 4 bolts (there's one right at the bottom) for the water pump.
18/ Flip off the bottom hose and top hose (from by no.1 spark plug) and remove the water pump. Have a large bucket underneath to catch the antifreeze in.

19/ With a sharp scraper, clean all traces of old gasket from around the block so that it's all nice and clean for the new gasket.

20/ With a vice, undo the top hose from the water pump (19mm)
21/ Using the nuts which were taken off the water pump for the viscous fan, lock 2 nuts together and wind out the studs, these are needed for the new pump.

22/ On the new pump, wind in the 4 studs, and put the top hose on.

23/ smear the surface of the water pump with a small amount of instant gasket, and then put the gasket on, then smear the face of the gasket with a little more.

24/ Put the water pump on, nip all 4 bolts up then tighten evenly to pull the pump against the gasket against the block in an even pull.

25/ Place the pulley back on the water pump, and loosely put the serpentine belt on (it's easier to do this now before the fan is put on)

26/ Stick it all back together

27/ Top up the power steering since a little will have leaked out, and re-fill with a strong mix of antifreeze.

28/ Adjust the serpentine belt so that there's 90 degree twist over the longest run.


All in all, it's, with a cup of tea and no hurrying an hour and a half job, and quite easy to do with minimal tools.

Soooo nice to not have a damp bottom hose :D
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greggmo

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Re: 4.0 I6: Changing a water pump
« Reply #1 on: February 18, 2009, 11:14:23 PM »

well done. good write up too. 8-)  any knuckles lost?
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scrw

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Re: 4.0 I6: Changing a water pump
« Reply #2 on: February 19, 2009, 09:02:46 AM »

is this on a wrangler? as there are a few steps I didn't need to do when swapping one on a WJ & XJ
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eastryjeep

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Re: 4.0 I6: Changing a water pump
« Reply #3 on: February 19, 2009, 03:31:48 PM »

Cripes!
AMC 6/258 much easier, except the ruddy pump costs a fortune!
Good write up, but maybe too many words for me, I got confused when it didn't say reassembly is the opposite of removal  :-D
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Dodster

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Re: 4.0 I6: Changing a water pump
« Reply #4 on: February 19, 2009, 04:03:20 PM »

Nice write up, I did my zg a couple of months ago moreless exactly like this.. those studs were a b!tch to get out.. :-D
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