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It is next to the thermostat housing has three gold bolts with a big one in the center. It has a gasket behind it does it seal coolant or oil? What is this thing?

Thanks

Thermostat housing. alternator bracket, water pump housing, engine block, timing chain tensioner, and manifold.



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1985 300SD
1983 300D
2003 Volvo V70

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Timing chain tensioner uses a spring and oil pressure acting on a piston to tension the timing chaing.

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