Re: [Amel Yacht Owners] Raw water cooling

Bob Grey

Pat, the transmission oil cooler should be checked every service as yes it does get blocked, mine blocked first time after 300hours in southern Australia due to the type of spaghetti thin sea grass in Port Phillip bay and the symptoms were identical to what you describe, temp goes up with revs, less water out exhaust. Easy to spot with the engine room hatch open look at the hose coming out of the transmission cooler, rev to 2500 (out of gear if your in dock)🙄 and the hose between the seawater pump and the trasmission cooler flattens as the pump creates a vacuum in this pipe as it's sucking and not getting flow.

The local Volvo dealer cleans the oil cooler every service, but he says this is good because the smaller tubes in the transmission cooler catch the weed and protect the heat exchanger from blocking up. It's a a really big job to clean weed out of the heat exchanger.

Bob Grey
Renaissance 3

On Friday, March 31, 2017, 08:38, sailw32@... [amelyachtowners] wrote:


I always check my exhaust for water flow after starting the engine , a Volvo TMD 22A. It is difficult to determine as the exhaust pipe is partially under water , I wish it had been installed a couple of inches higher. I have never thought I had as much water expelled as I would expect. I have seen many boats which seemed to have a more robust exhaust of water. My temperature seems to rise when the rpms go above 2500 . The heat exchanger is always kept clean . I have never taken off the raw water manifold or the transmission cooler, for those that have , have you found any blockage (growth etc.)that could inhibit the flow of water .


Pat SM#123

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