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Duramax Third Generation: 2006-2007.5 (LBZ & LLY) Discuss the third generation (2006-2007.5 LBZ & LLY) of the 6.6L Duramax diesel engine & associated components. 2006 LLY engine discussion also belongs in this forum due to the similarities of the 2006 LBZ and the 2006 LLY. Engine related discussion ONLY.

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Old 01-04-2020, 04:55 PM   #1 (permalink)
Hauling
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Changing thermostats

Any gasket sealant required for this?

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Old 01-04-2020, 04:57 PM   #2 (permalink)
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I have both thermostats and new gasket.

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Old 01-04-2020, 05:31 PM   #3 (permalink)
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Old 01-04-2020, 10:32 PM   #4 (permalink)
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Thanks for welcome. I posted before I watched merchant automotive and a couple other youtube videos on changing thermostats. I have two thermostats and gasket. Merchant auto just said clean the mating surfaces. I drained my coolant by lower hose. Its messy but I got about 4 gallons in bucket. Probably half gallon on garage floor that I soaked up with rags. I removed oil fill tube bracket, moved compressor, rotated oil fill tube to remove tstat housing. There is no gasket. Just two thermostats with outer seal. I am in central mass. I own a 2007 GMC 2500hd sierra classic ecsb. LBZ, stock. 155k miles. Truck is in my garage. I may look for a new Oring for coolant tube into tstat housing in morning. Otherwise, I am just putting it back together.
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Old 01-04-2020, 10:33 PM   #5 (permalink)
OKMillerTime
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Should come with the o-ring type gasket that goes around the rim on the thermostats. Go with oem....at least thats my take on them. No need to cheap out on a critical part!

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Old 01-04-2020, 11:00 PM   #6 (permalink)
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The thermostats have seals. I am thinking of oring that mates the aluminum housing to the steel tube.
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Old 01-05-2020, 01:43 AM   #7 (permalink)
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Might as well while your in there!

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Old 01-05-2020, 07:36 AM   #8 (permalink)
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Quote:
Originally Posted by Hauling View Post
Any gasket sealant required for this?
The tstats have their own gaskets. You just need the oring for the upper radiator housing.
Nothing else.
GM Part : 98280281 GASKET/O-Ring ENGINE COOLANT THERMOSTAT HOUSING(FOR THERMOSTAT)(SEAL)(PART OF 1,4)
Require Quantity:02 Package Quantity:1 $5.49 each

Last edited by Rvn4me; 01-05-2020 at 07:43 AM.
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Old 01-09-2020, 05:06 AM   #9 (permalink)
Gerard Andrea
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The merchant video explains everything including bleeding the system after the thermostats are installed.
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Old Today, 11:11 AM   #10 (permalink)
SAYWHAT
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Fill system very slowly, you will get less air pockets!

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