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Old 23-07-2019, 17:20   #1
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Nissan sd22 diesel won't increase rpm when in gear

Engine starts and runs fine. In neutral throttle advance gets full rpm. Butt when in gear no increase in rpm when throttle is advanced. Any ideas please?
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Old 23-07-2019, 18:03   #2
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Re: Nissan sd22 diesel won't increase rpm when in gear

Have you checked the linkage mechanism on the motor?
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Old 23-07-2019, 18:28   #3
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Re: Nissan sd22 diesel won't increase rpm when in gear

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Engine starts and runs fine. In neutral throttle advance gets full rpm. Butt when in gear no increase in rpm when throttle is advanced. Any ideas please?
"No" increase, or only a bit of increase.

The former indicates a probably linkage failure, the latter suggests problems with injectors/injector pump.
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Old 23-07-2019, 19:53   #4
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Re: Nissan sd22 diesel won't increase rpm when in gear

Linkage good. Stalls in reverse. Must be IP governor?
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Old 23-07-2019, 20:04   #5
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Re: Nissan sd22 diesel won't increase rpm when in gear

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Linkage good. Stalls in reverse. Must be IP governor?


Ok, now we have gone from no increase in rpm to stalls in reverse.

I am confused.

Im trying to help but I think a fuller description would help us a to help you.
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Old 24-07-2019, 08:45   #6
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Re: Nissan sd22 diesel won't increase rpm when in gear

Yes, linkage is ok.
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Old 24-07-2019, 10:09   #7
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Re: Nissan sd22 diesel won't increase rpm when in gear

If engine revs up in neutral and then stalls in gear I think you should call a mechanic after you have made sure you have no obstruction in prop and shaft and packing .
Good luck
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Old 24-07-2019, 18:06   #8
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Re: Nissan sd22 diesel won't increase rpm when in gear

As alluded to in other posts the engine does move a bit when placed in gear, this movement might cause bind, especially if mounts are worn.
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Old 24-07-2019, 18:52   #9
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Re: Nissan sd22 diesel won't increase rpm when in gear

Thanks much for the posted replies. The engine is mounted well with no movement. When in neutral, I can turn the prop shaft freely by hand. Engine starts and runs smooth at idle. If I put in forward, prop turns and boat moves forward at idle speed. If I increase throttle, no increase in rpm. The linkages are all good. I can see the fuel lever move, but no increase in RPM. The fuel intake lever is open. All filters replaced. Pickup tube is clear. Tried with diesel cap open, no change. Fuel coming out injectors when cracked open at idle.
Wow-crazy!
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Old 24-07-2019, 19:14   #10
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Re: Nissan sd22 diesel won't increase rpm when in gear

Your prop is a coral reef
Your packing gland has seized
Your transmission is out of oil or bearings seized
Your flexible link is sheered in two
Edit: your alignment is off
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Old 24-07-2019, 21:00   #11
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Re: Nissan sd22 diesel won't increase rpm when in gear

Nope. Diver confirmed prop is fine. Shaft turns easily by hand. Transmission oil ok. Shift into forward and boat moves very well in forward idle. No vibration. I am beginning to think it is the governor in the IP.
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Old 25-07-2019, 15:02   #12
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Re: Nissan sd22 diesel won't increase rpm when in gear

Have a mechanic check out the fuel pump.injector pump.
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Old 25-07-2019, 15:27   #13
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Re: Nissan sd22 diesel won't increase rpm when in gear

If yours is set up like my sd22 was, the governor doesn't know or care if the transmission is in neutral.

The injector pump is gear driven and extremely reliable, I would rule out everything else before tearing into it.

I once had a problem where mine started running rough and then died. It would restart and idle, but would run rough with above 1/3 throttle applied. I cracked the injector lines at the block and got fuel so I kept looking. As it turned out I was getting fuel but not enough fuel - clogged secondary fuel filter wasn't allowing full flow. I didn't think to check it first because the 25 micron secondary filter was downstream of 10 micron racor primaries. Changed the filter and flushed the injector lines and back to normal.

If your symptoms are direction dependant, I would suspect the transmission.
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Old 25-07-2019, 15:45   #14
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Re: Nissan sd22 diesel won't increase rpm when in gear

I changed all of the filters. Since it is a marinized SD 22 "truck engine" I wonder. In a truck, the fuel tank and engine are about the same height. In the boat, the tanks is below the engine. There is an electric fuel pump that brings up the fuel. It really puts out into a bucket. But then, the fuel goes from that pump to a mechanical pump on the engine. I wonder if that pump may have failed?
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Old 26-07-2019, 18:21   #15
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Re: Nissan sd22 diesel won't increase rpm when in gear

Can you clarify exactly what the symptoms are? There aren't a ton of sd-22s in boats, and having had one and having struggled to find information I'd like to help if I can. It's generally speaking a reliable engine but there aren't a lot of resources for it.

It runs to full rpm in neutral, correct?
If you put it in gear fwd, what exactly happens when you advance the throttle?
If you put it in gear reverse, what exactly happens when you advance the throttle?
Does it start reliably?
Does it idle reliably?
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