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6.5L Turbo Diesel 1992-00 6.5L Turbo Diesel - Welcome to the Internet's first discussion forum for the 6.5L diesel engine. Tips on performance, upgrades, cooling, fuel economy, troubleshooting and more.

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Old 06-10-2019, 06:17 PM
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Default Bolts for dual thermostat housing

Does anyone know the part number or specific size of the 4 bolts that hold the water outlet to the dual thermostat crossover manifold? Have searched this forum and the internet and cannot find them. Also, is there a gasket between the two or just the 2 t-stat seals? Thanks.
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'95 GMC Sierra 6.5TD C2500, reg cab, long box, 2x4, 4L80E, 3.73 ratio, GVWR 8600, VIN F, L65, 100K. Mods: Diamond Eye 4" exhaust and crossover pipe, Wicked Wheel, PMD relocate, Duramax fan/clutch conversion, performance air induction kit.
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Old 06-11-2019, 05:18 AM
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The bolts are metric... 1.5mm thread pitch x 10mm in diameter, length to suit. It's been a while since I've dealt with a dual stat housing... Jim
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Old 06-11-2019, 06:35 AM
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Default gaskets

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Originally Posted by More Power View Post
The bolts are metric... 1.5mm thread pitch x 10mm in diameter, length to suit. It's been a while since I've dealt with a dual stat housing... Jim
Could you comment on gaskets.....from what I see on these complete kits, it looks like there are several o-rings but no gaskets, except for where the crossover mounts to the block. Am trying to order parts separately to make my own kit to convert my 1995 to a 1997 cooling system. Thanks for the bolt info.
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'95 GMC Sierra 6.5TD C2500, reg cab, long box, 2x4, 4L80E, 3.73 ratio, GVWR 8600, VIN F, L65, 100K. Mods: Diamond Eye 4" exhaust and crossover pipe, Wicked Wheel, PMD relocate, Duramax fan/clutch conversion, performance air induction kit.
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Old 06-11-2019, 08:02 AM
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There are the just two rubber gaskets used around each thermostat. No other gaskets.

Casey
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1995 K1500 Tahoe 2 door, 6.5LTD, NP241, 4L80E, 3.42's, 285/75R16 BFG K02's, Kennedy OPS harness, gauges, and TD-Max chip, Dtech FSD on FSD Cooler, vacuum pump deleted, Turbo Master, 3.5" Kennedy exhaust, F code intake, '97 air box, dual t/stats, HO water pump, Champion radiator, Racor fuel filter, 345K miles and running strong!
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Old 06-11-2019, 09:28 AM
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Originally Posted by arveetek View Post
There are the just two rubber gaskets used around each thermostat. No other gaskets.

Casey
Ya know that's what I thought but wanted to be sure. Thanks for the input.
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Old 06-11-2019, 09:39 AM
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The seals with the thermostats are effective. If the housing leaks, it's likely due to crack(s), or porosity in the casting. Almost never does gaskets or RTV cure that. Use minimal recommended bolt torque, and blue thread locker. This prevents warpage and cracks.
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Old 06-11-2019, 02:29 PM
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Quote:
Originally Posted by DmaxMaverick View Post
The seals with the thermostats are effective. If the housing leaks, it's likely due to crack(s), or porosity in the casting. Almost never does gaskets or RTV cure that. Use minimal recommended bolt torque, and blue thread locker. This prevents warpage and cracks.
Great info. Thanks! Do you know if these cooling upgrade kits have special parts that are modified to make installation easier, or are they just the stock parts put together as a kit? I looked up parts for a 1997 GMC 6.5L on AcDelco.com and found all the part numbers I needed (except for the 4 bolts). Then checked these part numbers at several online parts houses. Found I could save anywhere from $175 to almost $300 buying them myself. Spent many hours searching the forum for cooling upgrades....learned about the "balanced flow" pumps and "bypass cooling" and such. Decided the '97 cooling upgrade with HO pump and dual t-stat was what I needed. Any suggestions or comments would be greatly appreciated. Thanks.
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Old 06-12-2019, 06:11 AM
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Originally Posted by rnash4 View Post
Spent many hours searching the forum for cooling upgrades....learned about the "balanced flow" pumps and "bypass cooling" and such. Decided the '97 cooling upgrade with HO pump and dual t-stat was what I needed. Any suggestions or comments would be greatly appreciated. Thanks.
Yes, the OEM factory cooling upgrade is the best way to go. I actually purchased a 1997 C3500 parts truck (had a 6.5L with a dead cylinder; broken piston I believe) and just swapped all the cooling upgrades over to my 1995 Tahoe. Even grabbed the upgraded air filter housing. I kept the engine and all other parts I wanted, and sold the remains for more than I paid for the truck in the first place!

Casey
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1995 K1500 Tahoe 2 door, 6.5LTD, NP241, 4L80E, 3.42's, 285/75R16 BFG K02's, Kennedy OPS harness, gauges, and TD-Max chip, Dtech FSD on FSD Cooler, vacuum pump deleted, Turbo Master, 3.5" Kennedy exhaust, F code intake, '97 air box, dual t/stats, HO water pump, Champion radiator, Racor fuel filter, 345K miles and running strong!
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Old 06-12-2019, 06:35 AM
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Originally Posted by arveetek View Post
Yes, the OEM factory cooling upgrade is the best way to go. I actually purchased a 1997 C3500 parts truck (had a 6.5L with a dead cylinder; broken piston I believe) and just swapped all the cooling upgrades over to my 1995 Tahoe. Even grabbed the upgraded air filter housing. I kept the engine and all other parts I wanted, and sold the remains for more than I paid for the truck in the first place!

Casey
That was a good idea. I will start looking around for a 97+ parts truck myself, not many 6.5's around here anymore. Thanks.
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'95 GMC Sierra 6.5TD C2500, reg cab, long box, 2x4, 4L80E, 3.73 ratio, GVWR 8600, VIN F, L65, 100K. Mods: Diamond Eye 4" exhaust and crossover pipe, Wicked Wheel, PMD relocate, Duramax fan/clutch conversion, performance air induction kit.
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Old 06-13-2019, 08:15 AM
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Finally found the part number for the 4 water outlet bolts Gm#24504922. Thanks to all for your input.
Randall
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'95 GMC Sierra 6.5TD C2500, reg cab, long box, 2x4, 4L80E, 3.73 ratio, GVWR 8600, VIN F, L65, 100K. Mods: Diamond Eye 4" exhaust and crossover pipe, Wicked Wheel, PMD relocate, Duramax fan/clutch conversion, performance air induction kit.
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