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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ok so its like shimming out the rack cap on a p7100
Knucklehead wrote:I consider the smokescrew to be part of the linkage. It can be screwed in enough to shut the motor down, but as you mentioned, even all the way out isn't that rich. (Please note that the term "excessive fuel" on the previous diagram is relative to available air.) If you unscrew it until the control lever doesn't even touch, what then is stopping the control lever? Better yet, if you remove the control lever from the side of the shaft, or even remove everything in the diagram except the control rack, what stops the rack? It is where the front end of the rack bottoms out in the capnut on the front of the pump. You may make the fundamental adjustment by shortening (screwing in) the bolt in the front of the rack, which allows the rack to travel further forward. It is, essentially, taking the spool out from under the gas pedal. It may be screwed in all the way without affecting the functioning of the side linkage. The photo is with the capnut off.
Again, for anyone else who actually does care about the life of their motor, that as NR said, black smoke is bad. The blacker, the longer, and the greater the load, the faster the damage.
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