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#1
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Testing the overboost protection switch
How do I test the overboost protection switch to make sure that it vents through the top of the switch in an overboost situation?
-Joe
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'81 MB 300SD, '82 MB 300D Turbo (sold/RIP), '04 Lincoln Town Car Ultimate Sooner or later every car falls apart, ours does it later! -German Narrator in a MB Promotion Film about the then brand new W123. |
#2
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testing
Hi Joe,
the switch in the manifold: I fixed a hose from the compressor to the thread of the switch and checked with gauche and voltmeter. 1.2 bar I think. the valve on the firewall: blow in from the manifold side and check the way to the IP. Give 12 V to it and check whether the way to IP is shut and the valve is vented. For a short test you can hear the click when giving 12 V. Tom |
#3
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I believe the switch on the manifold itself is fine. How do I give the switch on the firewall 12V?
__________________
'81 MB 300SD, '82 MB 300D Turbo (sold/RIP), '04 Lincoln Town Car Ultimate Sooner or later every car falls apart, ours does it later! -German Narrator in a MB Promotion Film about the then brand new W123. |
#4
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the switch on the manifold brings ground to the valve.
Just disconnect the socket of the manifold switch and bridge to ground. Then you should hear the click of the firewall valve. Or: disconnect the socket of the firewall valve and test the pins. The BL/YL/RD should give you +12V the BR/BK, leading to the manifold switch should give you nothing until the shut off pressure is reached. To believe that the mainfold switch is o.k. is not enough in my opinion. I feel better being sure it works. Tom |
#5
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Mine hasn't even been hooked up since I bought the car. I 'm doing fine without it.
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'85 300SD (formerly california emissions) '08 Chevy Tahoe '93 Ducati 900 SS '79 Kawasaki KZ 650 '86 Kawasaki KX 250 '88 Kawasaki KDX200 '71 Hodaka Ace 100 '72 Triumph T100R |
#6
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Quote:
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1984 300SD Turbo Diesel 150,000 miles OBK member #23 (\__/) (='.'=) This is Bunny. Copy and paste bunny into your (")_(") signature to help him gain world domination |
#7
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I think it would have blown by now. I put about 70,000 miles on the car without it. The last 10,000 or so with a boost gauge hooked up and a controller dialed in to about 14psi.
__________________
'85 300SD (formerly california emissions) '08 Chevy Tahoe '93 Ducati 900 SS '79 Kawasaki KZ 650 '86 Kawasaki KX 250 '88 Kawasaki KDX200 '71 Hodaka Ace 100 '72 Triumph T100R |
#8
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Quote:
The overboost solenoid is a failsafe if that ever happens.
__________________
Proud owner of .... 1971 280SE W108 1979 300SD W116 1983 300D W123 1975 Ironhead Sportster chopper 1987 GMC 3/4 ton 4X4 Diesel 1989 Honda Civic (Heavily modified) --------------------- Section 609 MVAC Certified --------------------- "He who fights with monsters might take care lest he thereby become a monster. And if you gaze for long into an abyss, the abyss gazes also into you." - Friedrich Nietzsche |
#9
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I just went out and tested it. That sucker didn't pass the tests, looks like I'm going to have to go out and get a new one. Thanks for your help everyone.
-Joe
__________________
'81 MB 300SD, '82 MB 300D Turbo (sold/RIP), '04 Lincoln Town Car Ultimate Sooner or later every car falls apart, ours does it later! -German Narrator in a MB Promotion Film about the then brand new W123. |
#10
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Quote:
__________________
'85 300SD (formerly california emissions) '08 Chevy Tahoe '93 Ducati 900 SS '79 Kawasaki KZ 650 '86 Kawasaki KX 250 '88 Kawasaki KDX200 '71 Hodaka Ace 100 '72 Triumph T100R |
#11
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Quote:
__________________
Proud owner of .... 1971 280SE W108 1979 300SD W116 1983 300D W123 1975 Ironhead Sportster chopper 1987 GMC 3/4 ton 4X4 Diesel 1989 Honda Civic (Heavily modified) --------------------- Section 609 MVAC Certified --------------------- "He who fights with monsters might take care lest he thereby become a monster. And if you gaze for long into an abyss, the abyss gazes also into you." - Friedrich Nietzsche |
#12
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It has occurred to me that one might use the manifold pressure switch (overboost sensor) to switch a small piezo siren (e.g., one of the Mallory Sonalert units) located in the cabin. These can be had surplus for cheap, and many models are loud enough that they would be hard to ignore.
That might be just the ticket for someone who is (1) really cheap and/or (2) philosophically opposed to the stock overboost protection plumbing arrangements. |
#13
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slightly off topic
So one of those dawes devices just plugs right into the small (what 10 inch long, 1/2 inch thick) line that goes from the turbo to the wastegate controller?
I'm on the road now, several hundred miles from my car. Just trying to get an idea of what is where. I will install a boost gauge to check function before spending the few bucks on the dawes device. I plan to T into the boost line right where it goes from the banjo bolt, into the overpressure sensor. JP |
#14
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Quote:
__________________
Proud owner of .... 1971 280SE W108 1979 300SD W116 1983 300D W123 1975 Ironhead Sportster chopper 1987 GMC 3/4 ton 4X4 Diesel 1989 Honda Civic (Heavily modified) --------------------- Section 609 MVAC Certified --------------------- "He who fights with monsters might take care lest he thereby become a monster. And if you gaze for long into an abyss, the abyss gazes also into you." - Friedrich Nietzsche |
#15
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Thanks
I guess i have to have patience.. something in short supply when it comes to fixing up this cool car I just got.
I will see what the gauge reads when i get it. I think the most effect will be the ALDA adjustment... as the car is sluggish pre boost. It still has the factory seal on at 169k How do I tell which kind of turbo I have? More threads to search now.. JP |
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