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Old 09-10-2015, 07:09 PM   #1 (permalink)
edzeb
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1996 Water pump Upgrade Question...

I am just starting my water pump upgrade installation. I have a quick question though (as I have not removed the old pump yet). The manual shows studs on top of the pump, and I do see that the top attachment points in the new pump are threaded.
Forgive the silly question, but does the front plate come off with the pump? Or is there access to nuts on the back side of the plate?
Also, I attached a pic of the truck because I finally figured out how to do it (I hope...lol)

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Old 09-10-2015, 07:49 PM   #2 (permalink)
edzeb
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I see that the coolant pump plate does come off with the pump.

Next question: What RTV would you guys use when I reassemble?

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Old 09-10-2015, 08:39 PM   #3 (permalink)
chevy410
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I use permatex copper on everything peersonally
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Old 09-10-2015, 11:17 PM   #4 (permalink)
JMJNet
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The part that is not exposed to air, there is something called Anaerobic RTV.
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Old 09-10-2015, 11:46 PM   #5 (permalink)
alpacalips
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In case you didn't read it here already, make sure to put blue loctite on those bolts that go through the back side of the plate into the water pump. If one falls out it goes into the timing gears and you're screwed.

Also the long stud top bolts on the sides of the plate that go through into coolant need sealant on the threads.

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Old 09-11-2015, 01:07 AM   #6 (permalink)
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Sharp looking truck. New water pump needed at 72 k miles? or did the 96s not have the ho pump?
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Old 09-11-2015, 05:05 PM   #7 (permalink)
edzeb
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Thanks Alpacalips for the info.
Diesel-T, the current pump works fine, but is not the HO pump. It looks original, I just want to upgrade the cooling for towing.
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Old 09-11-2015, 05:23 PM   #8 (permalink)
alpacalips
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when I did my water pump I used an acdelco thermostat as suggested by everyone on this forum. It was good advice. Not sure of the brand of my old one but it was not OE type and it did some weird things. Like every single time I drove from a cold start it would heat up to about 210 before it would open the first time, then it would stabilize somewhat at 195. Even if the truck was warmed up then sat for more than half an hour, first thermostat opening after startup it would go up to 210 before it would open. Acdelco 131-91 along with HO water pump and it holds nice and steady at 190 under normal driving.
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Old 09-14-2015, 03:08 PM   #9 (permalink)
GM Guy
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make sure to try to copy the OEM setup for a model year 2000 (parts lookup: 2000 C3500 6.5L diesel )

The pump has the same GPM as the late 96 through early 99, but balances the flow much better. 52/48 on the 99.5-2000, and about 75/25 on the early 99 and older.

Definitely use OE grade AC Delco.
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