I am in the process of installing a new cylinder head on my Yanmar (raw water cooled) and discovered the exhaust manifold, where the passages looked free, had blockage on the end of the manifold where the mixing elbow connects. There is a large, flat copper gasket between the manifold and elbow which, when removed, showed a large build-up of carbon in the manifold passages, substantially blocking passage of the cooling water. Just another place to look.
Gary Nylander - 30-1 From: CnC-List <cnc-list-boun...@cnc-list.com> On Behalf Of Tom Buscaglia via CnC-List Sent: Sunday, February 2, 2020 2:06 PM To: cnc-list@cnc-list.com Cc: Tom Buscaglia <t...@sv-alera.com> Subject: Stus-List Raw water blockage I have checked the intake, pump, strainer, heat exchanger, mixing elbow. All are clear, elbow is new. Still, no water out exhaust. I am wondering if the vented loop between the heat exchanger and mixing elbow could be the culprit. It is even necessary on my boat? Seems that the elbow is well above the water line and the loop could be bypassed. The only other possibility is the hoses on the suction side of the system collapsing on the inside...but that still seems unlikely. Thoughts appreciated. Tom Buscaglia S/V Alera 1990 C&C 37+/40 Vashon WA P 206.463.9200 C 305.409.3660
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