Contrails ! Bosch VE Inection Pump
Contrails ! Bosch VE Inection Pump
Contrails ! Bosch VE Inection Pump
Contrails !
Home Engine Bosch VE injection pump
This aircraft was largely drawn from the Banbi-MCR familiy, with an
inexpensive engine.
"Here was my occupation on last friday night : prepare a nice Bosch pump to install in a Peugeot
205.
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12/10/2017 Contrails ! Bosch VE inection pump
Here is our starting point : a pump, suitable seal kit, control lever
bushing and input shaft lip seal.
There's a lot of parts in a Bosch pump. There are still more in a Roto
Diesel !
Needless to say, once the pump is in pieces, all the parts must be
thoroughly cleaned. Further, liberally lubricating the rubbing, sliding
or reciprocating parts with penetrating oil is an obligation during reassembly.
Et hop :
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Hoooo, it's empty ! You can even see my jeans through the opening
at the bottom :lol:
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12/10/2017 Contrails ! Bosch VE inection pump
Now we are reassembling the following : the roller carrier ring, with
its drive pin for the timing mechanism.
Inserting the drive pin into the roller carrier (caution, place the pin
hole in the right position !) :
Here is where the drive pin goes when in its working position :
OK, now we only have to slide it back into the roller carrier in order to install the timing piston :
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12/10/2017 Contrails ! Bosch VE inection pump
Mind the correct orientation ! The hollow spring housing must face
the transfer pump communication port (green) :
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I finally got rid of the cold start mechanism, since the 205 normally
has none, and so doesn't have any cold start control. I replaced it
with the regular cover :
Installing the four arm spider that drives the rest of the pump mechanism :
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When installing this part, the plunger drive peg (green circle) must line up with the input shaft
key.
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12/10/2017 Contrails ! Bosch VE inection pump
When riding the rollers, the face cams move the plunger axially,
compressing fuel for injection. Timing is modified by rotating the
roller carrier by means of the timing piston located beneath.
Here I changed the cam disk, since the one which came with the
pump doesn't have the same profile. The new one comes from a 205
injection pump.
Under the control of the regulator levers, the sleeve slides and
variably covers the plunger spill port (green circle on previous
picture).
During injection, the plunger moves axially under the thrust of the cam disk. According the
control sleeve position, the spill port is uncovered when the plungers slides, after a variable
portion of the stroke. Thus the injected fuel is metered (when the spill port is uncovered, high
pressure fuel escapes, and injection ceases).
The plunger is named "distributor" because it revolves and directs fuel to each delivery port, via
its slits and channels.
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We now insert the distributor plunger into the high pressure head :
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Detail of the lever pivot with special screws (I made a purpose socket
by grinding an old 13 mm socket)
Shucks, no way ! ... We have to remove the pressure head and insert the levers BEFOREHAND
:mad:
By the way, please note on the plunger, the spill port (green), distributor slit (red), and the 4
metering slits at the end (green). The plunger is hollow to connect everything.
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Top Governor
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We now insert the shaft into the casing, and tighten it with an Allen wrench and an open wrench,
to hold it in position while tightening the locknut.
The shaft position is key, as it commands the injection timing. Make sure its position is
adequately marked when dismantling :
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Voila, now the pump assembly is complete, we just have to reinstall the case cover, and the
transfer pressure regulating valve. I could have installed the valve before, but...
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Finally the input shaft lip seal (it is installed with a large socket and driven home by screwing the
pulley nut onto the shaft).
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Sorry, no photo.
And voila, we're done. All we have to do is bolt it into the Peugeot 205 ! :-)"
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