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[rik1165]

After removing the old thermostat from my V6 elite, and all of the old gasket sealant. i proceded to replace with a new thermostat, and refill  the cooling system. i was disappointed when i discovered the system leaked.
I discovered that the leak was coming from the new thermostat housing, so i removed it believing that i had somehow mangled the O-ring whilst fitting it. In actual fact, the leaking coolant was coming from one of the thermostat bolt holes in the engine block.
I inspected the hole in question to see if the were any tell tale signs of a botched DIY job of some sort, but the hole is the correct size and the thread seems to be original.
I dealt with the problem by using plenty  of sealant around the whole of the thermostat mating surface including the bolt holes and the bolts themselves.
I was just curious if this is common.

[VXL V6]

I'm sure someone recently had to fit a washer as the bolt was too long.

[Matchless]

There are two versions of the thermostat housing, early ones had a fairly thin flange, later ones have a much thicker one.
If you are swapping from one type to the other then you need the matching bolts.
One of the bolt holes does go right through into the water jacket, you are supposed to use a thread sealant.

[Seth]

There are two versions of the thermostat housing, early ones had a fairly thin flange, later ones have a much thicker one.
If you are swapping from one type to the other then you need the matching bolts.
One of the bolt holes does go right through into the water jacket, you are supposed to use a thread sealant.

Another easy fix is to fit a copper washer (of the correct size diameter) under the bolt head.

[rik1165]

Thanks for the explanation. I appreciate you taking the time.
Cheers