The injection pump has not been removed, not by me during all the refit
work and not by any of the mechanics who have worked on this engine
. I struggle to see how the injection timing could be off given no movement of the pump, but I am not ruling that out and will look into checking it.
NM... I will run the engine under load tomorrow and remove the hose you indicated and post back with the results. Do you feel I need to sea trial or can I run in gear at the dock
for this test? When I next run the engine under load I will also remove the breather line from the valve cover and see if I feel any pulsing or pressure. When the mechanics checked this before it was sitting at the dock
in neutral with no load.
back pressure clearly must be checked and other than the test NM requests this is my next thing to attack. The exhaust
is fairly simple. The mixing elbow
has a short length of 4" diameter hose going directly downward that is about 6" long. This connects to a large fiberglass
90 degree elbow
that has a 3' section of the same 4" diameter hose attached to it which ends at the fiberglass water lift muffler
. The same hose exist the muffler
vertically going straight up to a large fiberglass vented loop that ends directly under the helm
station. The hose from the vented loop goes back down and turns rearward passing through a bulkhead, makes another 90 degree turn with another fiberglass elbow and then runs straight out the back of the boat. All of the hose and the fiberglass elbows and such are 4" inner diameter.
I had not thought of a setup for checking the internal state of the hose and muffler like that posted for inspecting plumbing
. That looks like a great idea and I will see about checking into having a plumber bring one out or if I can rent one.
At this point I see 3 possible issues:
- Bad compression
not allowing the engine to generate the power it should
- Exhaust blockage causing back pressure and reduced turbo boost
- Bad injection pump or timing