Sd22 does under load

SD diesels were widely available in the US in the 1981-86 Datsun/Nissan 720 pickups, and in Canada through '87 in the D21 pickup.

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Sd22 does under load


Post by Ldog » 7 months ago

My sd22 boat engine starts and runs fine in neutral at all rpms. Soon as I put in gear it dies even at 1400 rpm. Thoughts?

Also my electric fuel pump is very warm.

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Location: Vancouver Washington USA

Re: Sd22 does under load


Post by waynosworld » 7 months ago

Does it rev and then start dropping rpm until it dies or does it just die abruptly?
I would say change out the fuel filters first, if it doesn't have a pre-filter then I would check the screen in the lift pump banjo fitting on the bottom of the lift pump.
I know the voices are not real,
but they have some really good ideas.

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Re: Sd22 does under load


Post by Ldog » 5 months ago

I am still hoping for more thoughts on my issue. I replaced all filters, replaced the electric lift pump, replaced the cutoff solenoid. replaced the mechanical fuel pump. Bled carefully in sequence. Engine starts, runs up to full rpm in neutral. When in gear, zero increase in rpm. All cables OK. Lift pump pulls from tank freely. No smoke. Air cleaner clean.

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Location: Cochrane Alberta Canada

Re: Sd22 does under load


Post by plenzen » 4 months ago

Is the prop shaft seized in the stuffing box? Maybe have 3/4 of a mile of nylon line wrapped around the wheel?
I know this is a bit late and you probably have it figured by now.

Retired Pauly
Problem with being retired is that you never get a day off.
1987 D21-J SD25 KC

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