I have come across a partially dismantled 6 cylinder inline injection pump from a Toyota Landcruiser 12h-t engine from 1988 vintage. It is essentially the same pump as fitted to a 2H Landcruiser. These are a Denso pump.
I have loaded several photos and a 65mb movie file to Injection pump video
The purpose of the inspection, and this posting, is to show how there are no seals internally inside this pump that would cause a problem if running on Biodiesel, nor go brittle with heat if running on high temperature veggie oil.
The side cover is removed from the pump and shows the six springs that control the pump pistons. These are covered in engine oil, not fuel. Fuel is carried in the gallery at the top just under the delivery nozzles and behind the 6 large Phillips head plugs. This gallery might hold 200mls of fuel, probably less.
Tolerances are so small that no fuel escapes past the pump pistons and into engine oil galleries.
There ARE 'O' rings at the base of the fuel supply nozzles, but if they leak it will be obvious on the outside of the pump and not cause any damage - just a bit of a weeping mess and a relatively easy fix after removing injector lines.
You can also see the rubber flange of the boost compensator. Boost pressure is applied to this aneroid and it moves the fuel rack to provide more fuel at boost if the full load screw at the front of the housing is turned OUT.
At the other end of the same shaft of the aneroid, another adjustments controls the fuel supply OFF boost and to increase power at the bottom of your revs and before boost comes on, then screw this screw IN a small amount.
Pictures of this adjustment on an engine are at 12H-T power boost | landcruiser
I've loaded repair manuals at 60 Series Workshop Manuals
I trust this is a useful contribution.
Tim
I have loaded several photos and a 65mb movie file to Injection pump video
The purpose of the inspection, and this posting, is to show how there are no seals internally inside this pump that would cause a problem if running on Biodiesel, nor go brittle with heat if running on high temperature veggie oil.
The side cover is removed from the pump and shows the six springs that control the pump pistons. These are covered in engine oil, not fuel. Fuel is carried in the gallery at the top just under the delivery nozzles and behind the 6 large Phillips head plugs. This gallery might hold 200mls of fuel, probably less.
Tolerances are so small that no fuel escapes past the pump pistons and into engine oil galleries.
There ARE 'O' rings at the base of the fuel supply nozzles, but if they leak it will be obvious on the outside of the pump and not cause any damage - just a bit of a weeping mess and a relatively easy fix after removing injector lines.
You can also see the rubber flange of the boost compensator. Boost pressure is applied to this aneroid and it moves the fuel rack to provide more fuel at boost if the full load screw at the front of the housing is turned OUT.
At the other end of the same shaft of the aneroid, another adjustments controls the fuel supply OFF boost and to increase power at the bottom of your revs and before boost comes on, then screw this screw IN a small amount.
Pictures of this adjustment on an engine are at 12H-T power boost | landcruiser
I've loaded repair manuals at 60 Series Workshop Manuals
I trust this is a useful contribution.
Tim
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