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Old 02-07-2013, 03:54 PM   #1 (permalink)
racer55
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6.5 Cooling system Parts and pieces for upgrade

I will try and condense one of the most commonly asked questions about cooling system upgrades into a thread with the correct part #'s currently available.

96 1/2 - 98 130GPM 4 bolt waterpump AC Delco :# 252717,GM # 88926231
2000 spin on clutch 130GPM waterpump AC Delco:# 252776,GM #88926290

Single thermostat:AC Delco:# 13191,12559338
Dual thermostat: AC Delco:# 131103,12559336

Fan 20" steel:AC Delco:# 1580730,15992650
Dmax fan:AC Delco:# 1580690, 15010202, 15228374, 1580920

My preference for the 4 bolt fan clutch is the special calibration clutch from Kennedy Diesel:http://www.kennedydiesel.com/categor...ubCategory2=10

4 bolt fan clutch AC Delco:# 154674,15022302 (stock engagement)
Hayden severe duty:# 2839 (stock engagement)

Spin on fan clutch AC Delco:# 154691,15029405 (stock engagement)
Haydon Severe Duty spin on Fan clutch: #2840 (stock engagement)

Rad cap AC Delco:# RC81,25661994 (without turning ears)
Rad cap AC Delco:# RC27,10409635, 25060216, RC36B (with turning ears)

Radiator AC Delco:# 21380, 89018624 (auto trans)
Radiator Delphi:# RA1216 (auto trans)
Radiator AC Delco:# 21027,52477775, 89018623 (manual trans)

Water crossover bleed screw AC Delco:#10070107

Anything I may have left out please feel free to add or correct.

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Last edited by racer55; 02-07-2013 at 03:55 PM.
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Old 02-07-2013, 04:11 PM   #2 (permalink)
Diaric
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Added into the FAQ's under Engine Cooling


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1987 6.2l Jimmy , being restored,4" lift, 35 mudders 1993 W350 5.9 , custom stretched cab, duelly flatdeck
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well to make your pump retarded, you could let it hang out with me for a day
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Diaric wins thread derailment......
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Yeah Diaric, I gotta say, I'm afraid I'm going to have to give you an official warning on that.
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Old 08-28-2013, 06:41 PM   #3 (permalink)
dixiepc
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I'm finding some other numbers for water pumps that might be helpful.

The AC Delco #251-603 and GM numbers 12456231, 19168609, and 88894035 are suppose to have a more balanced flow between the left and right heads.
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37 x 12.50R16.5LT HUMMV tires (rolls out at 35")
2.5" true duals with Flowmaster SUV 50's with a 2.5" H-pipe just in front of the mufflers bent over the driveshaft.
Averages 18+ mpg around town.

1997 K2500 Silverado 6.5 TD, 2000 GM enhanced block, Extend Cab, Short Box, with a NV4500. 4" Diamond Eye straight exhaust. Holset H1C turbo with 60mm compressor wheel and 14 cm exhaust housing. Converted to a 5149 DB2 set to 4911 specs by Tim at Accurate Diesel.
Averages 18+ mpg around town and 14+ mpg towing my crawler on the highway.
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Old 08-28-2013, 06:49 PM   #4 (permalink)
racer55
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There was an article from Heath that showed a civilian H1 waterpump that was supposed to be best-forget the number but IIRC is a spin on fan clutch.
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Last edited by racer55; 08-28-2013 at 06:49 PM.
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Old 09-17-2013, 05:28 PM   #5 (permalink)
turbovanman
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So for a 98 with dual stats, what's the best combination of parts, IE fan, clutch and waterpump?
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1984 G20 Diesel Get a Way Van, 6.2L turbo. Rebuilt 1989 700R4, 3.08 gears. Fluidamper, modified hummer headers, 2.5" mandrel Y-pipe to 3 inch single system, Hooker Max Flo muffler, 3 inch F350 mandrel bent tailpipe-passenger side exit, 6.5L turbo lower intake, 6.5 military IP-5149, Turbonator open faced injectors set to 2500 psi, HX35W with a 60x86mm cast wheel at 15psi, ARP studs, .010" head gaskets, bypass oil system, Dmax van fuel pump/filter combo, Aeromotive fuel pump. REMOTE MOUNT TURBO INSTALLED!!!! Burning hydraulic fluid, jet fuel, WMO.
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2004 VW Wagon TDI 5 speed-blue-also modified-Mine!

1989 Dodge Caravan ex daily driver, 2.5L TIII DOHC Turbo, GT35R, [email protected] mph.

2002 Gold Dmax 4 door, 2500HD 4x4-new camper/trailer hauler-minor mods and a small tow tune!
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Old 09-17-2013, 05:39 PM   #6 (permalink)
racer55
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Nothing wrong with what it came with other than the fan clutch-it was designed to engage too late.

A fan clutch mod or replacement with a Kennedy clutch would be my approach.
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Last edited by racer55; 09-17-2013 at 05:39 PM.
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Old 09-17-2013, 05:47 PM   #7 (permalink)
turbovanman
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I've gone buggy reading thru all the threads, different fan clutchs, fan's-2 Dmax choices, lol.

He tows 12K and just mentioned this trip its overheating, the fan clutch is original and has 200,000 km's on it. I have to reseal the timing cover so might as well put the 2000 waterpump in, do the bypass mod, now have to replace the fan clutch-2886 and 2840 are options and do the fan if needed.
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1984 G20 Diesel Get a Way Van, 6.2L turbo. Rebuilt 1989 700R4, 3.08 gears. Fluidamper, modified hummer headers, 2.5" mandrel Y-pipe to 3 inch single system, Hooker Max Flo muffler, 3 inch F350 mandrel bent tailpipe-passenger side exit, 6.5L turbo lower intake, 6.5 military IP-5149, Turbonator open faced injectors set to 2500 psi, HX35W with a 60x86mm cast wheel at 15psi, ARP studs, .010" head gaskets, bypass oil system, Dmax van fuel pump/filter combo, Aeromotive fuel pump. REMOTE MOUNT TURBO INSTALLED!!!! Burning hydraulic fluid, jet fuel, WMO.
2003 VW Wagon 2.0L TDI auto, silver, heavily modified-Wife's.
2004 VW Wagon TDI 5 speed-blue-also modified-Mine!

1989 Dodge Caravan ex daily driver, 2.5L TIII DOHC Turbo, GT35R, [email protected]04 mph.

2002 Gold Dmax 4 door, 2500HD 4x4-new camper/trailer hauler-minor mods and a small tow tune!
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Old 09-17-2013, 06:49 PM   #8 (permalink)
racer55
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I would stick with the 4 bolt waterpump and Kennedy clutch myself-even the spin on clutches are too late engaging IMHO.

You should already have the good steel fan.

Cleaning the cooling stack is real important and with 200k on the clock the fan clutch is almost certainly toast.
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2005 Chev K3500 CCLB Dmax

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Last edited by racer55; 09-17-2013 at 06:50 PM.
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Old 09-17-2013, 07:02 PM   #9 (permalink)
turbovanman
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Quote:
Originally Posted by racer55 View Post
I would stick with the 4 bolt waterpump and Kennedy clutch myself-even the spin on clutches are too late engaging IMHO.

You should already have the good steel fan.

Cleaning the cooling stack is real important and with 200k on the clock the fan clutch is almost certainly toast.

I'll be doing the stack, did it a few years ago.

The Hayden 2886 is supposed to come on at 170, 30 deg cooler according to their specs. Couldn't find anything for the 4 bolt unit.
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1984 G20 Diesel Get a Way Van, 6.2L turbo. Rebuilt 1989 700R4, 3.08 gears. Fluidamper, modified hummer headers, 2.5" mandrel Y-pipe to 3 inch single system, Hooker Max Flo muffler, 3 inch F350 mandrel bent tailpipe-passenger side exit, 6.5L turbo lower intake, 6.5 military IP-5149, Turbonator open faced injectors set to 2500 psi, HX35W with a 60x86mm cast wheel at 15psi, ARP studs, .010" head gaskets, bypass oil system, Dmax van fuel pump/filter combo, Aeromotive fuel pump. REMOTE MOUNT TURBO INSTALLED!!!! Burning hydraulic fluid, jet fuel, WMO.
2003 VW Wagon 2.0L TDI auto, silver, heavily modified-Wife's.
2004 VW Wagon TDI 5 speed-blue-also modified-Mine!

1989 Dodge Caravan ex daily driver, 2.5L TIII DOHC Turbo, GT35R, [email protected] mph.

2002 Gold Dmax 4 door, 2500HD 4x4-new camper/trailer hauler-minor mods and a small tow tune!
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Old 09-17-2013, 07:19 PM   #10 (permalink)
racer55
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Kennedy Diesel

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Diagnostic Checklist 2.0
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