Fairline 32 AQD40 Overheating...........

[hwfal54]

Hi folks,

We have a Fairline 32 with Twin Volvo Penta AQD40 engines and 280z drives.

All is well at approximately 2600 rpm @ 9 knots with the temperature being 70-80 degrees C.

However at 3000+ rpm the temperature increases to over 90 degrees C at which point we reduce revs.

This problem means we can only ever get 9 knots due to the overheating.

Can anybody provide some advice please?

Cheers, James

 

[oldgit]

H,mm

You may be better off trying the MoBo forum with this.

Asume you have done all the usual stuff such as change impellors and checked filters for weed/debris etc.Checked for collapsed/ blocked pipes especially on water intake from leg to transom assembly.
Presume no leaks or weeps from hoses etc which allow air into raw water system.

Is the freshwater system losing or "gaining" water ? Remove header tank cap and check levels.
If the engines are the early 40A with the square heat exchanger it could be a blocked matrix or a split in the matrix.