Quote:
Originally Posted by vwnate1
# 1 : It's the ALDA .
#2: ? Did you find a manual OnLine or elsewhere for the M series injection pump ? .
# 3 : remember to check the ALDA for air tightness ~ a simple vacuum test will do, once the O-Right between the top and lower square halves begins to weep, everything else goes wonky too .
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Nate, it's a non turbo Euro spec car which are fitted with ADA as opposed to ALDA's, see below description (not sure if this is MB spec or forum post)
Intake manifold or atmospheric pressure compensator (ALDA/ADA)
The intake manifold pressure compensator (ALDA device) is comprised of a housing (103) with barometer unit (103b). The absolute pressure acts upon the barometer units through a port (103a) to the charge air pipe of the engine. Accordingly, the barometer units react to each pressure change with a change of length.
All movements are transmitted to the compound lever of the governor and to the control rod.
As the absolute pressure drops, the barometer units expand. The correction linkage (1030) of the units is pressed downwards and acts on the compound lever to move the control rod in the direction of "reduced quantity”.
As the absolute pressure rises, caused by a higher air and/or charge pressure, the movement is performed in the opposite direction- i.e. in the direction of "increased quantity".
When the control lever is in the idle position, the effect is approximately zero.
It is purely an emissions device to prevent/minimize the emission of black smoke, removing the ALDA will not increase maximum power.
The atmospheric pressure compensator (ADA) functions in exactly the same manner, the only differences being not connected to the intake manifold (its vent tube must be open to the atmosphere) and a slightly more sensitive operating range.
Removal of the ALDA/ADA is not recommended. Unlike other emissions controls, this device is beneficial in that it significantly reduces emissions without harm to the engine's power, economy or longevity and it reduces carbon deposits inside the engine.