GrantS

I have some pics for you. Don't know if the engine shots are of any help, but one of the primary filter shots, shows the return pipe coming back into the filter. By the way, thanks for the link to the service manual, but i have a Cd with that already on it.

Hi Antares, Thank you for your reply. I did take some photos of the fuel filter & hoses etc and will add them as soon as i have resized them. Yes, the engine is the 1.7 Isuzu with mechanical injection. I am fairley confident that there is only one fuel pipe to/from the tank, so it looks like someody may have set up the return to come back to the filter housing, as i reckon it has the original fuel tank from when she had the OMC Cobra. I will see if i can upload some piccies for you very shortly.

Just a quick question to put my mind at ease... My Primary fuel filter housing that is mounted on the boat, opposite the engine gets hot. (Input to filter has a rubber hose which is connected to a copper pipe to the fuel tank & output has two rubber hoses, one goes to secondry fuel filter mounted to the engine and the other goes somewhere on the side of the block, i guess to the pump. Both these hoses were also hot) Is this due to the hot diesel flowing back through on the return pipe and back through, or is it just heat transmitted back from the engine. I can't see what else would cause it to be hot, but thought i had better ask.

Thanks for the info & link, very helpful. I should have made a note of what size / pitch prop it had just before it was put back into the water. I guess i might be able to see it if i trim the drive fully up, although im not sure if it will come out of the water enough to see it properly (will check next time i am down there). As for the drive ratio, not too sure how i can find that out at the moment. The prop thats on it is so big that the large circular anode that normally has a fin in the middle and is located underneath and at the end of the cavitaion plate has the fin part missing, otherwise the prop would hit it. one of many jobs that i need to do................ Thanks again, Grant

Following on with this thread, I now own the boat, but will not be towing it. However, she is over propped. Based on the weight / length and the fact that she has 120HP Mercruiser Diesel lump that weighs in at 225KG according to the user manual and an Alpha 1 Gen2 drive (Don't know what gear ratio the drive is yet) The engine needs to acheive 4400 RPM at WOT, so is there anybody that can tell me the exact Pitch & Diameter prop for the engine to acheive its correct rev limit. Many thanks, Grant