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#1
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black box on valve cover.
I just purchased a 617 turbo for a project i am doing. The motor is from an 82 300d. What is the black box on the valve cover that has a few vacuum hoses going to it. currently no vacuum lines are connected... What do i need to connect to make sure the overboost protection is still functioning.
FYI The motor is not going back into a car it is going into a boat
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1987 300D 180k 1985 300SD 330k Helga 1992 300D Lola 269k- Sold 1986 325 coupe Bessie >300k Original engine(ODO Broke) sold 2006 2500HD Druamax Linda- Tows boat and looks pretty in garage thats about it |
#2
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The box is for the EGR, I removed mine.
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Ich liebe meine Autos! 1991 Mercedes-Benz 560SEL | Megasquirt MS3-Pro | 722.6 transmission w/ AMG paddles | Feind Motorsports Sway Bar | Stinger VIP Radar | AntiLaser Priority | PLX Wideband O2 | 150A Alternator | Cat Delete 1981 Mercedes-Benz 300SD | Blown engine, rebuilding someday... 1981 Mercedes-Benz 300SD | Rear ended, retired in garage. 2009 Yamaha AR230HO | Das Boot Excessive speeding? It ain't excessive till I redline! |
#3
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overboost does not go near that box.
overboost attaches to the intake manifold near the firewall, and flows to the OPR relay mounted on the firewall. then to the ALDA. it's NOT vacuum. it's pressure from the turbo.
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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread "as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do! My drivers: 1987 190D 2.5Turbo 1987 190D 2.5Turbo 1987 190D 2.5-5SPEED!!! 1987 300TD 1987 300TD 1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere! |
#4
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I took apart mine and repaired it according to this walkthrough
http://www.dieselgiant.com/trannyleverreplace.htm EDIT: Just read that the engine is going into a boat. Disregard what I said.
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1982 300TD Everything I know about cars I learned from PeachParts. Last edited by bluetypewriter; 04-19-2010 at 10:42 AM. |
#5
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I've done the same thing, depending on what transmission you're going to use, you won't have to worry about it at all. It would seem the egr system has been bypassed, just remove it.
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83 SD 84 CD |
#6
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Actually, it is vacuum some of the time.
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#7
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welll, sortof... I suppose it could be under a vacuum after a downshift, pulling against the turbo, it's NEVER associated with the vacuum system though. totally separate system. so you could pull the vacuum pump and all the vacuum lines, and still not affect the alda/overboost.
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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread "as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do! My drivers: 1987 190D 2.5Turbo 1987 190D 2.5Turbo 1987 190D 2.5-5SPEED!!! 1987 300TD 1987 300TD 1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere! |
#8
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You can pull a Vacuum in a Diesel Intake Manifold if your Air Filter is Plugged.
When the Turbo kicks in that Vacuum can get worse to to point it starts pullin Oil past the Turbo intake side seal. Anyway, I have seen that happe on Truck Turbos. You would have to ignore the loss of power symptoms before that could happen
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84 300D, 82 Volvo 244Gl Diesel |
#9
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Ok i will get rid of it then.... What do i need for the overboost protection then. I still have access to the car it came out of.
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1987 300D 180k 1985 300SD 330k Helga 1992 300D Lola 269k- Sold 1986 325 coupe Bessie >300k Original engine(ODO Broke) sold 2006 2500HD Druamax Linda- Tows boat and looks pretty in garage thats about it |
#10
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It has an electrical lead and I wouldn't know if it's just powered all the time or not. I've been driving my CD since I bought in '03 with the switchover (over boost protection valve) bypassed, you have a waste gate on the turbo, right?
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83 SD 84 CD |
#11
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Yes i do .... well the turbo that i am buying for it has a waste gate .... the motor currently has no turbo.
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1987 300D 180k 1985 300SD 330k Helga 1992 300D Lola 269k- Sold 1986 325 coupe Bessie >300k Original engine(ODO Broke) sold 2006 2500HD Druamax Linda- Tows boat and looks pretty in garage thats about it |
#12
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The overboost valve is always powered with a switched ground. Wire it from 12V to the valve, to the pressure switch on the intake manifold.
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Ich liebe meine Autos! 1991 Mercedes-Benz 560SEL | Megasquirt MS3-Pro | 722.6 transmission w/ AMG paddles | Feind Motorsports Sway Bar | Stinger VIP Radar | AntiLaser Priority | PLX Wideband O2 | 150A Alternator | Cat Delete 1981 Mercedes-Benz 300SD | Blown engine, rebuilding someday... 1981 Mercedes-Benz 300SD | Rear ended, retired in garage. 2009 Yamaha AR230HO | Das Boot Excessive speeding? It ain't excessive till I redline! |
#13
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Quote:
The manifold switch is powered except when the key is in the off position. An overpressure condition closes the switch and provides a ground for the overboost protection valve solenoid. |
#14
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Quote:
you could easily pull a vacuum on the airfilter Utube/ oil canister.
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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread "as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do! My drivers: 1987 190D 2.5Turbo 1987 190D 2.5Turbo 1987 190D 2.5-5SPEED!!! 1987 300TD 1987 300TD 1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere! |
#15
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The pressure switch on the intake manifold grounds out the valve and the 12v to the valve is constant in key on position? Just want to make sure i understand this correctly....
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1987 300D 180k 1985 300SD 330k Helga 1992 300D Lola 269k- Sold 1986 325 coupe Bessie >300k Original engine(ODO Broke) sold 2006 2500HD Druamax Linda- Tows boat and looks pretty in garage thats about it |
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