Paul L wrote: "Are you sure the cam is staying put?" ==> I don't see how it could be moving with the screw in it - also if the cam insert was moving I would expect some serous noise
"If the pump can suck fish
, it is fine." ==> The fish was not just passing by, it inserted itself, tail first, into the intake thru-hull so it didn't take much to pull it down the intake pipe. I changed the plastic thru-hull and valve for bronze
of the same size and added a scoop filter to keep the fish out. For overkill I added a salt water
strainer to the system on the inside. The original install had the seawater go through the gearbox
before getting to the intake pump - this did not work until the gearbox
was removed from the system. I now have a 'T' with a shutoff valve so water can be directed through the gearbox or not - worked for a while, but not since the strainer was added. Took the strainer out of the system but still no flow.
"Are you sure the inlet line is now clear?" ==> Yes, one can blow air back through the system and out the inlet.
"Are you sure that you don't have blockage in the tubes in the raw water
side of the heat exchanger
?" ==> There is no heat exchanger - seawater comes in from the thru-hull either because of a small amount of water pressure from being a foot under water or due to the weak suction generated by the impeller. It goes through the hoses and piping to the intake side of the impeller. When working, the water is then pushed through the engine and out the pipe around the exhaust
pipe into some kind of muffler
box and then out the exhaust
. I have tried it with the gearbox both in and out of the system and with the strainer both in and out of the system - no water comes out the exhaust port anymore.
A new pump is about $500 - and I can get a cheaper external pump that is belt driven off of some shaft or other; but then the engine has to be modified to add the pulley, pump, and some way to tighten the belt - the external pump for probably around $250 and unknown modification costs (although my builder
tells me that this is simple for me to do - he has not actually volunteered to do it though). Once I put the money
into the pump, I am not at all sure that the injector(s) will not then fail - one injector has only two threads remaining where the bolt that goes through the banjo fuel
fitting is tightened. I was thinking of ordering a pair of injectors if I order the pump - but I am unclear as to the difference between "injector complete is $522.52 but injector nozzle is $130.97". I have had the injectors out on numerous occasions and they seem to be steel
rods with a bit of machining for a spray hole and a threaded fuel
intake - what makes them 'complete'? (the bracket that holds them down? - why would this cost $400?). I am beginning to think my builder
is correct, despite having a Masters degree, I am too stupid to own a boat