So the last few weeks my yanmar
3gm30f has been hard to start. Yes its been cold out. But its harder starting then normal. Seems like one cylinder fires off right away, But then it dies when I let off the starter, maybe after a few seconds, as the other two are not working yet. Its taking 3/4 throttle to really get it going. Then I can hear the other two clyinders start working.
Today after running for hours and after a few hours off, it was again hard starting, where only one cylinder seemed to be turning. This is not normal as it had always started quickly if it had been running that day
Then Yesterday I found out that I have high crankcase pressure. In checking the CCV hose and fittings I found the orifice in the intake manifold plugged, but after cleaning
the orifice the crankcase is still building up pressure with the hose attached.
One last test: I started it up and at idle opened the decompression lever for each cylinder. #2 and #3 sounded about the same (rough idle with a knock with level pulled) but #1 did not make much difference. (No knocking at all).
only has maybe 1000 hours on it.
I'm thinking that #1 injector might not be working very well if at all. Will be looking at that the next few days.
When running it runs fine and runs up to 3400 rpm
in forward. A bit more in reverse.
I'm worried that the high blowby is due to wore or more likely a broken ring. Please tell me it ain't so.....
Coolent level is fine. Oil
had been going down some but that could have been from high crankcase pressure sending oil
down the guides.
I had just changed the oil and filter a week or so ago. Everything was fine then..