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Yanmar 2GM

RoyS

.
Jun 3, 2012
1,132
Hunter 33 Steamboat Wharf, Hull, MA
Thermostat may be OK. Simply removing it for a second may flush out an air bubble from that area that was keeping the thermostat out of the coolant. If so, then you should add a bleed device at the highest point on that manifold. On many engines that point is a hose on top of the manifold. This device cost about five dollars.
 

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