Having had a manifold to head gasket fail on the road I always remove the manifold and replace the gaskets when changing a thermostat as a matter of course.
As mentioned above it is easy to remove the manifold complete with injector piping. When I do it I use a couple of nylon wire ties to hold the two manifold parts together to avoid stressing the pipe connections.
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ZT-T190, Anthracite, LHD, Left the Line on June 24, 2002,
Sold new in Switzerland, spent time in Germany, Imported to Canada in September 2021
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