I am running the motor as a stand-alone, no emissions or transmission. The only vacuum components left are on the injection pump. Both the vacuum control valve and and ALDA are present. Are either necessary in the running/performance of the engine? Also, I intend to use the manual stop button for shutting down

Are you going to be running at a constant speed - like a generator?

The vacuum control unit (7) in your picture isn't going to be necessary - I'd just leave it there

As for the ALDA - you might be best off leaving that with the connection to the turbo too because it not only corrects for altitude but corrects the fuel input for the boost...

...many people junk all of these bits though

__________________
1992 W201 190E 1.8 171,000 km - Daily driver
1981 W123 300D ~ 100,000 miles / 160,000 km - project car stripped to the bone
1965 Land Rover Series 2a Station Wagon CIS recovery therapy!
1961 Volvo PV544 Bare metal rat rod-ish thing

I'm here to chat about cars and to help others - I'm not here "to always be right" like an internet warrior



Don't leave that there - I'll take it to bits!

Just to add, If you are using it as a constant speed motor, you could either remove the ALDA or leave it hooked up. I wouldn't leave it on an unhooked as this will limit fueling and power.

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2004 F150 4.6L -My Daily
2007 Volvo XC70 -Wife's Daily
1998 Ford F150 -Rear ended
1989 J-spec 420SEL -passed onto its new keeper
1982 BMW 733i -fixed and traded for the 420SEL
2003 Volvo V70 5 Speed -scrapped
1997 E290 Turbo Diesel Wagon -traded for above
1992 BMW 525i -traded in
1990 Silver 300TE -hated the M103
1985 Grey 380SE Diesel Conversion, 2.47 rear end, ABS -Sold, really should have kept this one
1979 Silver 300D "The Silver Slug" -Sold

its in a toyota, I had read some opposing info on the ALDA's purpose. Some people were removing and some people were not. The vacuum hose runs from the back of the intake to the ALDA. There is also an outlet there at the ALDA where the line splits, would this be a good place to install a boost gauge?

Sure. Also, remove the banjo bolt on the intake manifold and clean it since those often clog w/ gunk.

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1984 & 1985 CA 300D's
1964 & 65 Mopar's - Valiant, Dart, Newport
1996 & 2002 Chrysler minivans

Sorry to be picky, but the ALDA connection is a pressure line (manifold pressure caused by the turbo), NOT a vacuum line.

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Respectfully,
/s/
M. Dillon
'87 124.193 (300TD) "White Whale", ~392k miles, 3.5l IP fitted
'95 124.131 (E300) "Sapphire", 380k miles
'73 Balboa 20 "Sanctification"
Charleston SC