Technical New thermostat - which gasket to use?

[Jimmy23]

Hello!
I need to replace the thermostat and do a flush.
The new thermostat, from the link below, has a very narrow engagement surface near the bolt hole.
I bought a RTV gasket maker that I planned to use, but now I'm concerned that the narrow surface won't be enough to get a seal and that bits might break off and clog up the cooling system. The gasket that comes with the thermostat is from thicker paper material.

https://www.xdalys.lt/en/product/9430783036/

Also, should I remove the old thermostat to do the flush? It's not stuck closed/open.

 

[judderbar]

Hello!
I need to replace the thermostat and do a flush.
The new thermostat, from the link below, has a very narrow engagement surface near the bolt hole.
I bought a RTV gasket maker that I planned to use, but now I'm concerned that the narrow surface won't be enough to get a seal and that bits might break off and clog up the cooling system. The gasket that comes with the thermostat is from thicker paper material.

https://www.xdalys.lt/en/product/9430783036/

Also, should I remove the old thermostat to do the flush? It's not stuck closed/open.

It is not going to leak around the bolt hole if you go both sides of the hole. Let the applied RTV go tacky before putting together and lightly finger tighten the bolts. and then after an hour use a spanner. As for clogging something up. it has not happened to me so far.

I dont think there is any way to properly flush the system unless you disconnect a few pipes, so each section gets cleaned out. There is an h shaped thing for the heater hoses. It is designed so that some water bypasses the heater and goes directly back to the engine. If the heater gets blocked up water would still travel to the H shaped thing. The heater hoses are however almost glued on over the years and difficult to get off. You need a bent nail or something that can reach between the hose and the pipe to release the hose and do a lot of painful twisting backwards and forwards in a difficult to get to place! It will be easier to run the engine to temperature and drain it out again than try to properly flush it out. I did it on my car and it made no differnce at all!