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Old 08-18-2019, 07:17 PM   #1 (permalink)
88blazer
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water pump differences

Can anyone tell me the differences in water pumps and what years are different?I have an engine that needs a water pump and would like to know how to identify which one I need before I tear it apart.

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84 stepside with 3-53T Detroit 5 spd O/D Spicer
88 K5 was 350 TBI now 6.2L with GM3 turbo
84 dually crew cab 350 4spd 2wd
83 K5 6.2 diesel plow truck
98 3500HD 6.5L turbo diesel NV4500 going to be extend cab with 6V-53T, ZF 6spd and Mitchell aux. overdrive

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Old 08-18-2019, 07:18 PM   #2 (permalink)
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I should ad that it's a v-belt setup

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84 stepside with 3-53T Detroit 5 spd O/D Spicer
88 K5 was 350 TBI now 6.2L with GM3 turbo
84 dually crew cab 350 4spd 2wd
83 K5 6.2 diesel plow truck
98 3500HD 6.5L turbo diesel NV4500 going to be extend cab with 6V-53T, ZF 6spd and Mitchell aux. overdrive

Lots of parts trucks to keep the fleet going
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Old 08-19-2019, 02:10 AM   #3 (permalink)
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Quote:
Originally Posted by 88blazer View Post
I should ad that it's a v-belt setup
Use a marine one
they shift more water if you have overheating problems with twin thermo housing on fresh water side
My chevys are marine and shift 70 per gallons per minute through cooling raw water system i had a burst pipe on it and had 3 x2000ltr per minute bilge pumps running to keep up with flood !

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Old 08-19-2019, 04:34 AM   #4 (permalink)
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Thanks for the reply. I don't have the twin thermostat mods and I don't have an over heating issue either. In fact just the opposite. I can't seem to get enough heat out of my K5 during the Winter mos. But that's a whole different thread. I replace the w pump 3 yrs ago . The engine is a '91 so I ordered a pump for a '91. When I got it it had a bolt pattern different to the one on the engine. So, I went back and got one for an '84. That one fit. The felpro engine gasket kit I have has 2 different gaskets . I have since gotten a timing cover gasket kit ( for other work that needed to be done) and it also has 2 different gaskets.
I want to order a new pump from Rock Auto but there are at least 3 different Delco part numbers between an '84 and '91. For a '91 their listing says there's 2 different pumps and to verify which one I need . Unfortunately they don't say how.
I just want to get the right one ahead of time.
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84 stepside with 3-53T Detroit 5 spd O/D Spicer
88 K5 was 350 TBI now 6.2L with GM3 turbo
84 dually crew cab 350 4spd 2wd
83 K5 6.2 diesel plow truck
98 3500HD 6.5L turbo diesel NV4500 going to be extend cab with 6V-53T, ZF 6spd and Mitchell aux. overdrive

Lots of parts trucks to keep the fleet going
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Old 08-19-2019, 08:16 AM   #5 (permalink)
legendman
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What thermostat are you using? It might be opening too soon,
get a stant if you can.
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Old 08-20-2019, 12:37 AM   #6 (permalink)
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Quote:
Originally Posted by 88blazer View Post
Thanks for the reply. I don't have the twin thermostat mods and I don't have an over heating issue either. In fact just the opposite. I can't seem to get enough heat out of my K5 during the Winter mos. But that's a whole different thread. I replace the w pump 3 yrs ago . The engine is a '91 so I ordered a pump for a '91. When I got it it had a bolt pattern different to the one on the engine. So, I went back and got one for an '84. That one fit. The felpro engine gasket kit I have has 2 different gaskets . I have since gotten a timing cover gasket kit ( for other work that needed to be done) and it also has 2 different gaskets.
I want to order a new pump from Rock Auto but there are at least 3 different Delco part numbers between an '84 and '91. For a '91 their listing says there's 2 different pumps and to verify which one I need . Unfortunately they don't say how.
I just want to get the right one ahead of time.

Ya the reason is there is V belt used in real 1 tons, Blazers and Suburbans till 91 annnd serpentine belt used in the 1/2T, 3/4T and low spec 1 T all on the GMT 400 chassis from 88 on up .... and throw in 2 different power steering pumps ... now you see the issue...


Quote:
Originally Posted by legendman View Post
What thermostat are you using? It might be opening too soon,
get a stant if you can.

Yes, get a Geni GM or Stant stat and you may change it in 7-8 years...


As for dual stat's, most just find them a PITA cause 1 will fail and can cook one side of the engine while the temp gauge doesn't move cause it's on the other side of the block ...


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Old 08-20-2019, 04:48 AM   #7 (permalink)
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thermostat

Ah, ok that explains it. Thanks.




I'm running a Napa # 381-190 at 195*. I tested it in some hot water on the stove and it worked fine. I'm confident it 's the right one but if someone can correct me by all means please tell me. When I rebuilt the engine the block was hot tanked and the entire cooling system was new and I mean everything. I checked the HVAC controls and the blend door . All ok. I even run a factory squarebody winterfront and the heat still leaves a lot to be desired.
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84 stepside with 3-53T Detroit 5 spd O/D Spicer
88 K5 was 350 TBI now 6.2L with GM3 turbo
84 dually crew cab 350 4spd 2wd
83 K5 6.2 diesel plow truck
98 3500HD 6.5L turbo diesel NV4500 going to be extend cab with 6V-53T, ZF 6spd and Mitchell aux. overdrive

Lots of parts trucks to keep the fleet going
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Old 08-20-2019, 08:14 AM   #8 (permalink)
legendman
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Tell us more about this



84 stepside with 3-53T Detroit 5 spd O/D Spicer




Also any chance you can see any part #'s on the water pump that's currently on the K5?


Quote:
Originally Posted by 88blazer View Post
All ok. I even run a factory squarebody winterfront and the heat still leaves a lot to be desired.
Maybe it's not working hard enough, when I had my plow trucks they would get so warm I'd have to roll the windows down.
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Quote:
Originally Posted by Diaric View Post
What your saying happened, should never be able to happen.
Quote:
Originally Posted by smackzed View Post
I put a chevrolet tailgate on my last truck and it started acting like a girl...love me, need me, want me pay attention to me. Took it off and put the GMC back on (fixed the latch) and it went back to being the same old dirty bastard it used to be
~ Bob
1987 K20 5.7 TBI 700r4 np208
1999 Chevrolet K2500 5.7L Auto
2006 Jetta TDI 5sp
2002 Golf TDi 4dr 5sp

Do yourself a favor and read the 6.2 Diesel Student Training Manual ... lots of good info...it's in PDF format located here >> PDF Manuals

Last edited by legendman; 08-20-2019 at 08:17 AM.
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Old 08-20-2019, 02:57 PM   #9 (permalink)
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I get all the heat I need through the unshielded floorboards, the hacked up doghouse and the holes in the firewall.
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Old 08-20-2019, 06:58 PM   #10 (permalink)
redpepper
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Quote:
Originally Posted by Bigboytoys View Post
Ya the reason is there is V belt used in real 1 tons, Blazers and Suburbans till 91 annnd serpentine belt used in the 1/2T, 3/4T and low spec 1 T all on the GMT 400 chassis from 88 on up .... and throw in 2 different power steering pumps ... now you see the issue...





Yes, get a Geni GM or Stant stat and you may change it in 7-8 years...


As for dual stat's, most just find them a PITA cause 1 will fail and can cook one side of the engine while the temp gauge doesn't move cause it's on the other side of the block ...


They run best @180°stats mine run @195°

Sent from my SM-G965F using Tapatalk

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