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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