I keep having an annoying problem on my Volvo
2002 MD on my sailboat.
About a month ago I noticed that after some time of motoring there was no water
flow on the exhaust
. I immediately stopped the engine
and first thing I did was change the impeller although the old one didnt look bad.
the problem but only until my next trip when the problem repeated.This time, after sailing for a while and starting the motor
- again no waterflow.
Since then I did all of these things:
checked all seawater pipes and found a small piece of impeller in one,
tested the thermostat (OK opening on different temps) and changed its gasket
flushed the whole seawater system with HCL acid - many nasty water
put off and cleaned the exhaust elbow
(was dirty but not fully clogged),
made a partial rebuild
of my raw water pump
because of little oil
leaking (new shaft kit, orings and gaskets)
starts cold the water flow is good, after driving for a while or more hours and restarting it is also good, but after sailing and then restarting it sometimes (not always) doesn't flow out on the exhaust.
Except the first time, I am pretty sure that this happens only after sailing. Then I have to restart my engine
once or twice and then it starts flowing out again.
What to do next - I am thinking of removing head
and mecanical clenaing of all water passages) (not sure if that is necessary), or buying
completely new water pump.
Any other ideas?