Join Date: Feb 2013
Location: Mobile, AL
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Yanmar 4JHE Problems
Last week I changed both my fuel filters, the Racor and the spin on Yanmar one. Cranked up after little bleeding and seemed fine. So come the weekend we were going to go off and cranked it and let it run awhile, turned it off and then did not want to fire. So figured still a little air in it and went and bled and cranked up easy enough. Went to get some fuel at the dock next door and it was idling fine. We back out into the river and then when started going forward noticed it would not throttle up. Seemed to be choking down. Figured still had some air. Could put in neutral and it would rev up. So did that a few times and put back in gear. Went a bit and figured it would clear itself out. It would only get up to around 1700-1800 RPM. At this stage thought maybe something was wrapped around the prop and binding it so went swimming to see. Nothing on prop, but it was fouled somewhat with barnacles. Cleaned that while there.
When tried to crank this time there was some racket in the back of the engine with what sounded like metal hitting metal type noises, so I shut it down. Looked down at the drive train and saw nothing apparent. Shifted the trans up and down a few time and didn't seem bound. Tried again and still doing it so shut it down and called Boat US to tow us in. First time in all these years ever used the tow policy which was good to have.
Someone at the marina who used to work on engines said he had seen bolts on the flywheel on a Yanmar back out on one and get into the gear box cover before. Can put in neutral and spin the shaft and don't hear or feel anything, so flywheel thought may make some sense. One thing also noticed yesterday when looking at it was, the air cleaner had some oil like dripping coming from it and when I removed it had a handful of oily sludge in it. Not sure if that was caused when it was so loaded it was blowing fuel back. Was not doing that before because that area stays clean and could see it had dripped on the pan. Oil on the dip stick looked normal. Not sure what to think or where to even start. Gearbox is a Kazaki KBW20.
Prior to this always starts fine, no shifting issues. Ran good
Any thoughts would be appreciated.
Last edited by last mango; 04-27-2015 at 02:24 PM.