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  #1  
Old 04-19-2010, 01:32 AM
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Question 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
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  #2  
Old 04-19-2010, 01:37 AM
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1981 Mercedes-Benz 300SD
 
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The box is for the EGR, I removed mine.
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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!
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  #3  
Old 04-19-2010, 08:13 AM
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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!
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  #4  
Old 04-19-2010, 10:23 AM
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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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Last edited by bluetypewriter; 04-19-2010 at 10:42 AM.
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  #5  
Old 04-19-2010, 10:40 AM
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Quote:
Originally Posted by 300SD81 View Post
The box is for the EGR, I removed mine.
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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  #6  
Old 04-19-2010, 10:43 AM
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Quote:
Originally Posted by vstech View Post
it's NOT vacuum. it's pressure from the turbo.
Actually, it is vacuum some of the time.
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  #7  
Old 04-19-2010, 11:18 AM
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Quote:
Originally Posted by tangofox007 View Post
Actually, it is vacuum some of the time.
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!
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  #8  
Old 04-19-2010, 12:01 PM
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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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  #9  
Old 04-19-2010, 12:46 PM
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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.
__________________
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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  #10  
Old 04-19-2010, 06:10 PM
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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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  #11  
Old 04-19-2010, 09:21 PM
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Quote:
Originally Posted by toomany MBZ View Post
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?
Yes i do .... well the turbo that i am buying for it has a waste gate .... the motor currently has no turbo.
__________________
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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  #12  
Old 04-19-2010, 09:28 PM
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1981 Mercedes-Benz 300SD
 
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Location: University of Georgia
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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!
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  #13  
Old 04-19-2010, 09:28 PM
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Quote:
Originally Posted by toomany MBZ View Post
It has an electrical lead and I wouldn't know if it's just powered all the time or not.

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.
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  #14  
Old 04-19-2010, 09:30 PM
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Quote:
Originally Posted by Diesel911 View Post
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
not on the intake manifold you can't...
you could easily pull a vacuum on the airfilter Utube/ oil canister.
__________________
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!
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  #15  
Old 04-19-2010, 09:36 PM
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Quote:
Originally Posted by 300SD81 View Post
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.
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....
__________________
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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