Help nissan 720 sd22 diesel

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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Raptor6717
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Re: Help nissan 720 sd22 diesel

#31

Post by Raptor6717 »

OK, I used the hair dryer and it cranked with that. I have ordered some glow plugs. I have a spare alternator I can use also. I checked the main wires and it is putting out no voltage.

I have an issue with the key. The key will not shut off the engine. It does everything except that. Is this the injection pump controller or the ignition switch?

And I am going to rob parts off the other truck. Will an 81 datsun grill fit on an 83 nissan?
waynosworld
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Re: Help nissan 720 sd22 diesel

#32

Post by waynosworld »

OK, you say it will not shut off the engine, my first question is when the engine is off(not running), is the injection pump arm in the off position or the run position?

Another thing I would mention, you have bought new glow plugs, did you test your old ones, I ask because there is a chance that your old used glow plugs are better parts than the new ones you can buy, if your old ones work when tested use them, they do not sell the good ones anymore.

You say it cranked with the hair drier, does this mean it ran/started/tried to start sooner/quicker?

The grill can be switched out to the 1983 grill as long as you use all the sheet metal for that grill, you will also likely have to put the headlight buckets in the lower position also, later models the headlights are around an inch lower, 1981 on all the holes are in the sheet metal for all the years parts, 1980 only has the holes for the higher position for the headlights/buckets.

this is the truck/engine that does not start after sitting all night, there has to be a leak somewhere letting the fuel drain back to the tank
I know the voices are not real,
but they have some really good ideas.
plenzen
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Re: Help nissan 720 sd22 diesel

#33

Post by plenzen »

If I understand his post correctly it sounds like it may have started with the hair dryer but he did say:

"I checked the main wires and it is putting out no voltage.

No voltage to the glow plugs means it wont start without them, especially on a cold soak over night.

Your right about the glow plugs as the new ones are pretty fragile.

I had the Delphi ones that were pretty robust. ( HDS283)

I might suggest looking for the CN 433 Marine Nissan version of the plugs.
They were bullet proof.
No timers on the Marine version. Just a push button in the wheel house with a coil under a heat shield that you waited till it glowed red and then started. A lot of people would keep the button pushed after it started to help it idle a bit smoother.
Retired Pauly
Problem with being retired is that you never get a day off.
1987 D21-J SD25 KC
KJLGD21FN
Raptor6717
Posts: 14
Joined: 1 month ago

Re: Help nissan 720 sd22 diesel

#34

Post by Raptor6717 »

I meant the alternator is producing no voltage.

The truck will not automatically pull back to the off position when the ignition is turned off. There is a lever added so I can manually do it.

Yeah, I think the fuel lines are too old, the 2nd time I tried to start it with the drier it would not fire, but it did the first time. I had to bleed the injectors even though I had started it a few days prior. The truck will not start unless I spray ether, but I didn't have to use it when I used the hair drier.

I need some glow plugs anyway, the other sd22 engine doesn't have any, and I need to cover up the holes
waynosworld
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Re: Help nissan 720 sd22 diesel

#35

Post by waynosworld »

This is the thing about the injection pump controller that I am wondering about, I suspect it is in the run position all the time, I suspect that arm does not move at all, it is always in the run position, therefore it is never in the richer start position either.
Yes you pull on the choke cable to kill the engine, but there is enough movement in the assembly to pull it to the off position with a cable or with your finger with the injection pump being in the run position, I am thinking the injection pump controller and/or DPC module are not working at all.

I do not recall if this has been asked, does this diesel engine have a VE type injection pump or an inline injection pump, I could not tell in the photo of the engine compartment.

Do you have the fusible links and are they good?

You asked about replacing the alternator earlier, first I would make sure the big white wire has power(12V) in post 26 of at the fusible link and t the alternator, sometimes that plug on the alternator looks connected but is not or something is not plugged in before the alternator, as I said before my fusible link connector is melted in my 720 diesel dually, I sometimes have to wiggle the connector at the battery post or squeeze the connections at the post, my fusible links are good, but the connections are very old and been wiggled so many times they get loose and contact is lost, I cannot buy new fusible links.
I know the voices are not real,
but they have some really good ideas.
Raptor6717
Posts: 14
Joined: 1 month ago

Re: Help nissan 720 sd22 diesel

#36

Post by Raptor6717 »

The thing is I hear the controller move from start position after I stop cranking for a few seconds.

If the connectors are fusible links next to the battery then yes.

It is the Kiki inline pump
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