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Old 03-30-2015, 07:19 PM   #1
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Port Engine Dies in Reverse

Hi All,

Something I experienced over the this last weekend. When I placed the port engine shifter in reverse and added throttle, the engine died. I was performing a turn, placed the the port transmission into reverse -- gave it a little power and it died. It started right up, but happened a few more times. The boat is still new to me (Jan 2015), so maybe I need roll gently into the higher RPM.

Does anyone have any thoughts? Idle set too low, gremlins?

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Old 03-30-2015, 07:25 PM   #2
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How does it behave in forward?
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Old 03-30-2015, 07:40 PM   #3
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What kind of engines?
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Old 03-30-2015, 07:41 PM   #4
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Forward is fine, no problems at all.

The engines are Isuzu 135 Hp with low hrs.
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Old 03-30-2015, 07:48 PM   #5
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While impossible to diagnose long-distance, are you letting the shaft(s) come to a complete stop before shifting from forward into reverse? We measured this time on our boat, an it takes about 3-4 seconds at idle rpm. If you are going straight from forward to reverse the immediate load on the engine could be enough to stall it.s, to say nothing of being hard on the transmissions. We always pause for a moment in neutral to let the shaft stop spinning.

Idle too low has been mentioned and is a possibility. On the other hand, you don't want it too high as that can cause eventual damage to the transmission(s).

If it didn't do this before and now it's started doing it, if it was us this would mean time to call the diesel shop as I am not a diesel or transmission specialist.
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Old 03-30-2015, 07:58 PM   #6
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Transmission was okay during the survey, so maybe a pause between shifting might help.
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Old 03-30-2015, 08:03 PM   #7
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Forward is fine, no problems at all.

The engines are Isuzu 135 Hp with low hrs.
Sorry, I can't help with the issue you're having, but I'm very interested in those Isuzu engines. I presume they were swapped into the boat? Displacement? Turbo four? Engine designation? Who sells it? Is it available with more power? Is there an info source where I can find more data? Thanks (apologies for the semi-hijack).
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Old 03-30-2015, 08:15 PM   #8
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Well, I believe they are the originals, but they have been rebuilt (117 hrs). Isuzu 6bb1 6 cyl. No turbo and very economical. I bought the boat n Jan and from the info I found on the boat I think they are the originals or from what I have discovered.
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Old 03-30-2015, 08:16 PM   #9
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If it was the starboard engine, you'd really be in trouble. You're port engine might have a too-low idle, but that is a low likelihood. Does the port engine stall when starting from a dead stop? No trouble with the starboard engine when reversing? Maybe its idle is too fast. Try to avoid "jerking" the shaft(s) when changing directions.
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Old 03-30-2015, 08:51 PM   #10
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Well, I believe they are the originals, but they have been rebuilt (117 hrs). Isuzu 6bb1 6 cyl. No turbo and very economical. I bought the boat n Jan and from the info I found on the boat I think they are the originals or from what I have discovered.
Thanks for that. I'll look them up.
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Old 03-30-2015, 10:52 PM   #11
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Check idle rpm with a phototach. If idling too low, it is easy to stall. There is also a "buffer" screw on the injection pump, if it has the pump I think it does. That setting can affect stalling. I don't think that pump likes idling down to like 600, it needs to be up around 700 or idle is unstable. You normally notice it when snatching from fwd straight to rev and engine goes "poop".
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Old 03-30-2015, 11:22 PM   #12
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Transmission was okay during the survey, so maybe a pause between shifting might help.
It should not stall going into reverse. Especially if as you say, it happens after you are in reverse and you are then adding throttle.

No engine should quit because you need to pause before going into reverse to stop or slow the shafts from spinning. What would happen in an emergency? You would tell every thing to hold on a minute while you wait before you shift?

Check your idle rpm with an optical tach and see if it needs adjusting. You don't have anything wrapped around your prop do you?
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Old 03-30-2015, 11:46 PM   #13
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Hi Capt Bill,

Correct. I'm in reverse add throttle and it dies. Starboard does not stall in reserve, so I'm thinking rpm.

Ski NC, I'll check on the buffer adjustment.

I get the hull cleaned monthly, so I'll ask my diver to check for any fouling.
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Old 03-31-2015, 12:26 AM   #14
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So it stalls when you add throttle, not when you shift into gear? If that's the case then I doubt idle speed has anything to do with it.

I would check the throttle linkage and control cables ends. Perhaps there is something loose such that the initial nudge of the throttle actually causes the control on the injector to move back before it goes forward? Or maybe it is causing a short to a stop control?
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Old 03-31-2015, 12:49 AM   #15
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Short? Interesting. For the record, it starts right up, no hesitation or long cranking.

I forgot to mention this is happening from the fly bridge controls. Out of desperation, I went down below to the lower helm area to see if was any better, and it was. It never stalled from the controls from the lower helm area.

So, maybe it is a short or maybe the shifter on the fly bridge reacts differently. Thoughts??
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Old 03-31-2015, 12:56 AM   #16
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Are the shift controls totally mechanical or are there any electronics involved? What about the engine controls? Does the boat have engine synchronizers? Is the fuel shutoff mechanical or elecrical/solenoid?
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Old 03-31-2015, 01:03 AM   #17
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Shift controls are mechanical.

I am not sure about a engine synchronizer or even what it is. I guess I would say no.

Fuel shut off is electronic (push button).
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Old 03-31-2015, 01:07 AM   #18
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An engine synchronizer syncs the engines automatically as opposed to the operator having to do it manually.
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Old 03-31-2015, 01:15 AM   #19
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Nice! I might have to invest in one of those.
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Old 03-31-2015, 10:10 AM   #20
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neutral safety switch out of alignment? if it does it from one station and not the other it could possibly be a culprit..
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