Yanmar 2gmf stuck in reverse gear - SailNet Community

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Go Back   SailNet Community > On Board > Gear & Maintenance > Engines > Diesel
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Diesel This is a forum dedicated to diesel engines and their applicable accessories.


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Old 09-29-2013
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Angry Yanmar 2gmf stuck in reverse gear

Hi all -- I recently acquired a 1983 Pearson 303, which I'm liking very much. It has a Yanmar 2GMF 13 hp 2-cylinder diesel, which runs like a champ. This evening, however, I discovered, to my distress, that the transmission appears to be stuck in reverse, which created some difficulty in getting back onto my mooring in a 3-knot current in the Hudson River.

Some weeks ago I experienced some difficulty getting it to go *into* reverse, but that seemed to fix itself.

I have a bad feeling that the problem is in the transmission, not in the shifter cable, which seems to move freely.

Anybody ever have a problem like this? Any suggestions for things I should try, or check out?

Many thanks!

Last edited by rauschpfeife; 09-29-2013 at 07:14 PM. Reason: typo
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Old 09-29-2013
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Re: Yanmar 2gmf stuck in reverse gear

Is the cable actually moving the shift lever on the back of the gearbox (or transmission if you prefer)?
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Re: Yanmar 2gmf stuck in reverse gear

Take the cable off the lever and see if box shifts easily. May need a new cable.While you're there check the oil level
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Re: Yanmar 2gmf stuck in reverse gear

The cable seems to move freely until the rod it's connected to, which goes into the gearbox, won't move any farther. But of course it's hard to be sure the problem isn't with the cable. I'll disconnect as you both suggest and see whether that makes a difference. Thanks!
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Re: Yanmar 2gmf stuck in reverse gear

Oh and by the way, what's the right kind of oil for the gearbox? Much back-and-forth in the various forums, and I'm kind of a n00b to this...
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Re: Yanmar 2gmf stuck in reverse gear

Regarding the lubricant for the gearbox, Yanmar 2GM engines from that period can have a reversing gear from Hurst or Kanzaki. You need to look at the gearbox to determine which you have
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Re: Yanmar 2gmf stuck in reverse gear

Yes, this is the impression I'm getting from Teh Google. My elderly spine will protest at crawling back down there -- access is VERY difficult -- but I'll do it, and take a picture of the plate, if I can get to it. Thanks!
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Old 09-30-2013
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Re: Yanmar 2gmf stuck in reverse gear

If you have a Kanzaki-Hurth transmission you should use ATF.



Many folks put motor oil in these, and if you have oil in there I'd flush it (run, drain, fill, repeat 3 times)

that said, I cant imagine that the wrong oil would cause it to lock up in reverse. If you are lucky the shift lever is loose and rotating freely on the actuator shaft.
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Re: Yanmar 2gmf stuck in reverse gear

Both Kazaki-Hurth and the Hurth reversing gears were fitted by Yanmar to the 2GM; they are different critters. The Kazaki-Hurth is lubricated with ATF and the Hurth with 30 weight oil. Also note the fill line on the dip stick. You don't want to overfill them.
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Re: Yanmar 2gmf stuck in reverse gear

Okay, so I wriggled my way down to the gearbox -- it's not very accessible,
to say the least. The nameplate is on the starboard side, which is
*completely* inaccessible without a power saw, but I was able to snake
my cellphone around and take some pictures.

Near as I can make out, the nameplate reads:

MARINE GEAR - MODEL KM2-A
GEAR RATIO [Illegible -- 2.6? 2.5?]
OIL SAE 30/30 [Indistinct -- 20/30?] HD
OIL QTY 0.25 LI
NO [Illegible]
KANZAKI KOKYUKOKI MFG CO LTD

There is a bolt head labelled OIL on top, to starboard. There's another bolt
head on the port side, right at the aft lower edge of the side of the housing,
which I conjecture may be the oil drain. There's also an adjusting screw
on top, on the port side, which appears to affect the stiffness of the shift
detent.

I was able to muscle the gearbox out of reverse and into the various gears
a few times, so the immediate problem is solved for the moment. I didn't
have time to detach the shift cable, but I kinda think there may be some
stiffness both in the cable and in the box itself.

I'll try an oil change and top-up. Can anybody resolve the question
of oil type? My photos of the name plate are pretty fuzzy.

Many thanks!

By the way, I found it even harder to get back *out* of the gearbox
area than it was to get in. The boat's out on its mooring in the Hudson
River; I was by myself; it was getting dark; and I had a rather anxious
moment after one of my 65-year-old vertebrae gave me a nasty
reminder of its presence and discontent. The joys of sailing!
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