Need some help

[fsmd2]

I have a 34 ft wellcraft with twin 454's and v drives. The port engine (counter rotating) gets hot after 20 minutes of running at 3000 rpm. Some history, the raw water pump, the thermostat, the heatexchanger and waterpump are new. The waterstrainers are clean. Here is the mystery at least for me, when the port engine water temp climbs to over 200 if you slow the boat to a stop put the port v drive in reverse the temp goes down to 155,160. The oil in the v drive is new it does not smell burnt. The only thing I can think of is a trans cooler is somehow causing the issue. But in theory it shouldn't matter to the trans cooler which way the boat is going. Need some help.

 

[HT32BSX115]

Re: Need some help

I have a 34 ft wellcraft with twin 454's and v drives. The port engine (counter rotating) gets hot after 20 minutes of running at 3000 rpm. Some history, the raw water pump, the thermostat, the heatexchanger and waterpump are new. The waterstrainers are clean. Here is the mystery at least for me, when the port engine water temp climbs to over 200 if you slow the boat to a stop put the port v drive in reverse the temp goes down to 155,160. The oil in the v drive is new it does not smell burnt. The only thing I can think of is a trans cooler is somehow causing the issue. But in theory it shouldn't matter to the trans cooler which way the boat is going. Need some help.

Howdy,


Raw water pumps are frequently up stream of oil coolers and when they fail they can send impeller fragments and debris into the oil cooler(s) and other heat exchangers which will severely restrict water flow (enough to cause overheats).

You also might have clogged risers too. In general, anything that restricts water flow either into or out of the cooling system will cause overheats.

Regards,


Rick