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Overheating engine.
Posted: 22 May 2011 - By: Nina
Hi. I am new to this site and wondered if anyone could help me with a problem I don't seem to be able to fix. I recently re-engined my R34 with a new Yanmar engine which has been marinised by a company near me. The engine runs perfectly but under load the temp rises alarmingly. I told the supplier and he immediately supplied a new and more efficient heat exchanger ( according to him ). No difference. The engineer who fitted the engine and I have spent many hours trying to work out what is wrong. When started the engine spits out plenty of raw water but under load there seems to be less. Is it perhaps that the raw water circulation is insufficient ? The supplier swears it all worked fine on a bench test. Many thanks.


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