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Old 06-01-2019, 08:55 PM   #1
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Transmission issue or what?

So we ran all day, about 7 hours, and anchored at an interesting looking spot. Got all settled in then some dude said it was a private area or some such crap and I needed to move.

So I tried to move and every time I put it in gear it died. It would go in reverse and keep running but not forward. This is a brand new trans. Oil level is good.

Or maybe I wrapped something around the shaft when I anchored? Hope not. Water is super murky and I’m sacred to dIve in.

So should a regular guy dive down in murky water to try to cut away whatever is wrapped, if indeed that’s what it is?
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Old 06-01-2019, 09:32 PM   #2
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So engine off, in neutral, can you spin the shaft by hand?
You should be able to hold your breath long enough to feel around the shaft to see if there is something fouling it. Can’t see that taking more than 30 seconds.
I would not call a diver until sure there was work for him.
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Old 06-01-2019, 09:50 PM   #3
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Transmission issue or what?

Ok. I will try to dive down there tomorrow AM in some daylight. We got here late so maybe the water will look clearer in the daylight. I’m obviously a chicken.

Edit:

Just went down to spin the shaft, and it spins free! WTF?
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Old 06-01-2019, 10:05 PM   #4
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Take a serrated knife with you. It will work best if you need to cut anything.

You can work slowly on it each time you go under on a breath. Breath/relax.

Don’t worry about being under the water. You are safer there, then on the freeway.
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Old 06-01-2019, 10:17 PM   #5
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If you can spin the shaft freely, skip the dive. Might be the neutral switch.
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Old 06-01-2019, 10:30 PM   #6
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Neutral switch?
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Old 06-01-2019, 11:20 PM   #7
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The switch that prevents starting the engine if in gear. Might be out of adjustment.
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Old 06-02-2019, 12:02 AM   #8
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If the engine starts then any neutral switch installed is functioning properly.

I would start by shifting the transmission manually via the lever on the transmission and bypass the cables.

If same problem persists, and you have a typical yanmar KM4, I would call a yanmar mechanic to adjust the shifter. It may not have been shimmed properly at initial installation and may not be moving the drive cone a sufficient distance to engage the forward gear.
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Old 06-02-2019, 06:39 AM   #9
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Transmission issue or what?

Quote:
Originally Posted by SoWhat View Post

I would start by shifting the transmission manually via the lever on the transmission and bypass the cables
If same problem persists, and you have a typical yanmar KM4, I would call a yanmar mechanic to adjust the shifter. It may not have been shimmed properly at initial installation and may not be moving the drive cone a sufficient distance to engage the forward gear.

This seems likely. This new trans was installed two years ago and has worked flawlessly, but maybe it’s out of adjustment now?

Have you ever done this adjustment? I assume it’s done by adjusting the shift lever somehow?
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Old 06-02-2019, 07:57 AM   #10
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Transmission issue or what?

After inspecting the shift lever movement, according the the book its supposed to be at least 36mm and I only have 30mm or so. I’m adjusting this now. Does this seem like it could be a fix?

When I disconnected the cable and moved the shifter by hand it definitely found its “notch” past where the cable was letting it go, and the book seems pretty specific about this “more than 36mm of movement”. I’m trying to adjust this now so hopefully this fixes it. Click image for larger version

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This am I started the engine and put it in gear and while it chugged a bit it didn’t stall. And come to think of it, it has always felt like it was about to stall when putting it in gear and I had to advance the throttle quickly so it would not. I never thought about it however.

If this in fact does fix it,I’m not pleased with the guy who installed the trans and didn’t check this pretty important adjustment.
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Old 06-02-2019, 08:28 AM   #11
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Whoops. Just realized I adjusted the cable down by the lever up so forward would fully engage, but guess what? Now reverse doesn’t engage st all. I assume there is another adjustment under this Morse control lever.
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Old 06-02-2019, 10:22 AM   #12
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Ok, what trans and engine is this?

You adjusted the cable too far if you can't get reverse. Most gears it is not necessary to be against the stops. You adjusted it too far.

Suspect your idle rpm is too low and prop in fwd puts more load on engine (due to more efficient blade shape in fwd) so that's why it did not stall in rev.

What is your idle rpm? Four bangers can't idle down to 600 like sixes can. More like 750-800 for fours. And some fours want a bit higher.
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Old 06-02-2019, 10:24 AM   #13
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Transmission issue or what?

Yanmar 4jh and Kanzaki km4 trans

My idle is a bit below 800 so that might be it.

Thanks Ski. Will readjust when I stop for today.
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Old 06-02-2019, 10:29 AM   #14
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Yep, bump up idle a little. 4JH should be a stop screw on side of inj pump that leans on throttle lever. Takes 10mm wrench, but might be a 12mm.

Depending on which morse helm you have, some under the top cover plate are stop screws. Adjust cable and the screws so shift lever on trans in either gear goes nearly full travel but not against the stops.
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Old 06-02-2019, 10:42 AM   #15
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Thanks for posting this. Your current pain is giving us information we may need at some future date. Hope you're back to cruising shortly!
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Old 06-02-2019, 11:17 AM   #16
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At least you saved a diver bill and can move.
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Old 06-02-2019, 09:50 PM   #17
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Yes saved the diver!
Crazy mechanical things...
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Old 06-07-2019, 02:37 PM   #18
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Quote:
Originally Posted by cardude01 View Post
This seems likely. This new trans was installed two years ago and has worked flawlessly, but maybe it’s out of adjustment now?

Have you ever done this adjustment? I assume it’s done by adjusting the shift lever somehow?
The neutral safety switch prevents starting in gear, not running, it disables the starter only, so I doubt it's this.

Seems strange that is runs in reverse, sort of rules out something in the prop.
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Old 06-07-2019, 03:43 PM   #19
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What is this “private area” cr@p? That sounds like a load of old cobblers. If I was told that I’d get my flotilla and get them all to go there together!
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Old 06-07-2019, 04:03 PM   #20
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What is this “private area” cr@p? That sounds like a load of old cobblers. If I was told that I’d get my flotilla and get them all to go there together!
A “private” area in public waters. I wouldn’t want to interfere with anyone’s experiments and such, but there must be a better way of expressing it than “private area”.

Anyhoo, I guess Cardude’s tranny operation must be OK because he launched from Lake Worth yesterday about 4 AM and is cruising the Exumas as we speak.
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