I have a 98 Tahoe 5.7 and the water pump is leaking out of the weep hole.
Question is, besides the belt fan and clutch, and radiator shroud does anything
else need to be removed to get to it and replace it.
At quick glance it looks almost like the A/C and alternator brackets need to be
removed/moved to get the pump out.
Also is it still rule of thumb to change the timing chain at the same time??
Any procedures, write ups or advice, tips tricks, unknown pita issues would be
very appreciated as its leaking more every day. I need to make this as easy
and quick as possible..
You dont have to take the fan shroud off. That will just be wasted time. I
just drop the fan down in the bottom of the shroud while i take the pump
off. You shouldnt have to remove anything else. There should be a quick
disconnect in the top of the pump that will have to be taken out and put in
the new one but more than likely you will break it. They are bad about
that. So you may end up buying one of those. They are fairly cheap. $10
or so You do not need to change the timing chain. Belts yes chains no
You can rent a tool at auto zone to help take the fan clutch off but i just
use a long screwdriver in between the bolts on the pulley and a wrench to
take it off. The screwdriver to hold the pulley still. Leave your belt on
until after you get the fan clutch off. Thats helps a little bit. And take
the pulley off while the pump is still on the motor. Its alot easier that
way. 4 bolts holding the pump on. That should be about it. Pretty simple
No, you don't need to remove those brackets. The job is fairly
straight forward, remove the upper shroud (contrary to what another
poster says, I think that removing seven screws and getting the
upper shroud out of the way "saves" time), remove the fan, and
then other then disconnecting the appropriate bypass/heater hoses
and rad hoses (by the way, the bypass hose is quite difficult to remove
from the water pump while the water pump is still attached, so my
advice is to disconnect the bypass hose from the "intake" end of it.)
All you are left with at this point is 4 bolts. I will admit that it seems
quite "tight" in there with the brackets in place, but you can remove
and install the pump with them in place. I would also recommend that
you use some sort of contact cement to hold the water pump gaskets
in place on the water pump....put your four bolts in place in the water
pump....have your 9/16" socket and extension ready so that you can
move the water pump right up to the block and then start the four
bolts. At this point, you will be working almost blind, but if you have
the gaskets securely glued in place, there is little change that they will
go sideways on you.
Thanks Ian and everyone,
One last question, to remove the fan and cluch together there is 1 large "nut"
between the clutch and the pully. I assume this is the right hand thread you
Looks like its about 1 3/8th in size??? Is that the proper part to separate
the fan from the pump..Anyone know of the exact size so I can have the proper
wrench available, since it is quite large???,,, and when trying to break it
free does the belt and crank keep it secure or do you have to hold it some
other way to keep the whole assembly from spinning???
I don't know the exact size...I have the special tool...but I never
look at the size (just lazy, I guess). If you are lucky, you can
put the appropriate size wrench on it, and wack it with a hammer
and it will come loose. If not, you need a special tool that engage
the pump pulley (you can see small holes between the bolts in
the pulley), or you can use a pry bar between two of the bolts
in the pulley to hold it in place. Basically, you use whatever you
have at hand and a bit of ingenuity to get this loose.
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