Oil overfill on Yanmar 1gm

[Starrfish]

Oops! I overfilled the oil in changing my oil filter. Did not realize until after running motor a bit and ready to leave dock with increased RPMs booting motor down to stall.
Removed excess oil to mid point on dip stick but motor still stalls out. What could it be and what can I do about it?

 

[kloudie1]

Welcome to the forum, Starrfish. Going to need some clarification.. when you say "stall" do ya mean the engine stops/dies/kills? or is it that it reaches an RPM where it won't go faster? Any smoke? it may be that these things aren't related, but the overfill and the stalling are hard to connect, especially after you corrected the overfill. It could be that some oil trapped in the governor case could be affecting the rpm, but after you return the level to normal, the oil would have drained back out of the case and within 2-4 minutes, everything should have been back to normal. Did ya change the fuel filter at the same time?

 

[Starrfish]

Oil overfill

What I mean by stall is dies. I get past 1000 RPMs and it just floods out. No smoke and I did not change fuel filter at the same time. Some have suggested that I look at mixing elbow being clogged or air intake element saturation. There is no element and I ordered a gasket for when I pull off mixing elbow.
Not sure about how to check the governor.

 

[tpetrocci]

overfill

Having recently become very intimate with my 1 cylinder Yanmar I can offer a little experience if not help.
If the mixing pipe is relatively new ie 5-7 yrs old and you have been in a salt water environment it may be worth exploring. The cost of replacing approx. $300. and your time of course. You may want to make sure you're getting enough water through your intake as that proved to be my problem in the end. as it often goes you find the problem in the last place you look.
Fuel is often the issue with these I have learned, and so your high pressure fuel pump may be the problem. ( contrary to myth this can be removed and inspected but not for the faint of heart) And then the injector too. Bleed thoroughly at all points beginning from the fuel filter which you should change.
Sounds like you have an air intake block, so removing whatever cover you have may help as well. Sometimes I have to cajole it with a shot of ether on a cloth close to the intake to help it start after a long lay up, but be cautious with this method.
These engines are hard to kill so do not despair. Mine is over thirty years old and runs quite well. #.2 is all I get, but then again it is a sailboat.
Ted

 

[Alan Gomes]

If the mixing pipe is relatively new ie 5-7 yrs old and you have been in a salt water environment it may be worth exploring. The cost of replacing approx. $300. and your time of course. You may want to make sure you're getting enough water through your intake as that proved to be my problem in the end. as it often goes you find the problem in the last place you look.

I replaced the elbow on my 1GM with a new stainless one for about $100. Go to exhaustelbow.com

Also, Ted, I noticed that your boat is listed as a Catalina 30. Is your engine a 1GM? Seems like it wouldn't push a Catalina 30 too well. But I never heard of that engine in a C30 (though some had Universal 5411's--also quite underpowered, though a bit more power than a 1GM).

 

[BobT]

I had the symptom you describe for long enough to spend quite a few bucks on a fuel pump and replacement injector.
None of which helped. I also had oil leaks that I repaired and had several theories to muddle.
The end result was the $10 worth of hose between the primary fuel filter and the lift pump. It was just old enough to be brittle and let air suck in to the lift pump even with a tight hose clamp. I just happened to notice the tube spinning on the nipple as I checked the clamp for tightness.
Hope this helps.

 

[tpetrocci]

I believe it is YSM12...

 

[hotrodderjim]

It think the problems are not related.I had a similar problem with the engine speed & after changing the filter, draining the water separater & bleeding the system it still won't rev up! I ended up pulling my fuel pickup hose out of my tank & found there was a VERY small filter on the end of the hose! It had a piece of metal( looked like a .45 shell casing) with a small screen about 1/4" that was like the ones in a house faucet.I pulled that off, gave it a slight balonga cut on the hose & installed a nice big clear filter inline right above the tank!! It fixed the problem instantly.I just look at the filter to see if its getting clogged, so far so good.Its kind of a "pre-filter".It was only about $6 at auto zone.
Jim

 

[fireman416]

I’m going to have to agree with the group here that these things are not related. You either are having a fuel starving issue and or and air restriction. Because it chose to show itself after you overfilled your crank case I think is just a coincidence….Good Luck

 

[Maine Sail]

I suspect you need to change the fuel filters and properly bleed the fuel system. Check the exhaust elbow too. It would be have to be pretty viscous oil to shut down a diesel, even if overfilled. It would blow out the crankcase vent, gaskets and things like the dip stick before it shut down....

 

[rufus1138]

what about the possibility of damaged piston rings?

 

[Starrfish]

Got a lot to look at when I get back to the boat. Lots of good suggestions. Where to start? Fuel filter or mixing elbow? Not sure how to check if it is piston rings. That is beyond my ability to attempt a repair I suspect. Could very well be a coincidence but timing was back to back. I overfilled and next time I ran it bogged down over 1000 RPMs. Finally got to run strong at 3500 but then at my return the next time she never got over 1000 rpm.
I appreciate all the suggestions. Particularly those which tell me how hard it is to kill these 1gms.

 

[rufus1138]

definitely hard to kill, start with cheapest first, any engine on the planet that is the best thing to do, make the list of possibilities and start with the cheap ones.

 

[NYSail]

Didn't see anyone ask but How was she running before you overfilled the oil?

 

[Benny17441]

Was the engine running well before you changed the oil? If it was, it is not the mixing elbow. Concur that it may be a fuel problem, replace primary and secondary fuel filters and then bleed the system.

 

[Starrfish]

Never completed the saga but wound up pumping out oil to level mark then changed fuel filter. That has her running and then discovered after bleeding that a washer on bleed screw was bad and letting air in. Replaced that. Now have problem solved . Thanks community as you helped immensely .