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#1
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What purpose does the swichover valve serve?
What adjustments can you do with the switchover valve? It's a vacuum and electro switch on the firewall near the brake booster only on the outer firewall. It has an adjustment screw on the top.
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#2
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The switchover valve does not have an adjustment screw on it, at least all the ones I've seen don't.
It's goal in life is to slow down/shut off fuel to the IP if the turbo spools up too much pressure, I'm thinking a redundant system for the waste gate.
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83 SD 84 CD |
#3
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There's a little thumb screw thing on the top
Well at least it looks like a thumb screw. You can turn it cw and ccw. I just saw a vacuum line going to it and thought it was an adjustment for idle or shift. Thanks for the reply.
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1983 300 SD. 157K. 1964 Studebaker GT Hawk 1972 Corvette, Bought new 2007 Toyota Tundra 2007 Toyota 4 Runner 1993 Toyota Sequoia Press 1 to continue in English, Press 2 to disconnect and call back when you learn to speak English. |
#4
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Okay, what car and can you post pics?
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83 SD 84 CD |
#5
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It's an 83 300SD
It's an 83 300SD. I am not able to post a pic just yet.
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1983 300 SD. 157K. 1964 Studebaker GT Hawk 1972 Corvette, Bought new 2007 Toyota Tundra 2007 Toyota 4 Runner 1993 Toyota Sequoia Press 1 to continue in English, Press 2 to disconnect and call back when you learn to speak English. |
#6
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Is your valve round or square?
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#7
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Well, slap me silly!
Damn if there ain't an adjustment knob, never noticed it. And certainly don't know what to do with it.
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83 SD 84 CD |
#8
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It's square
It's square with 2 wires on a plug on the bottom and a vacuum line behind those wires.
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1983 300 SD. 157K. 1964 Studebaker GT Hawk 1972 Corvette, Bought new 2007 Toyota Tundra 2007 Toyota 4 Runner 1993 Toyota Sequoia Press 1 to continue in English, Press 2 to disconnect and call back when you learn to speak English. |
#9
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I can't find any adjustment procedures/reasons in the FSM. It's #21 in the pic.
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83 SD 84 CD |
#10
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Steve Brotherton , Import car
Steve wrote a real good article about MB transmissions and he refered to it but only in saying it sends a signal to an aneroid valve. I was jsu wondering.
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1983 300 SD. 157K. 1964 Studebaker GT Hawk 1972 Corvette, Bought new 2007 Toyota Tundra 2007 Toyota 4 Runner 1993 Toyota Sequoia Press 1 to continue in English, Press 2 to disconnect and call back when you learn to speak English. |
#11
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I don't think that is an adjustment. It is merely a cap for the vent. Someone correct me if I'm wrong.
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85 300D turbo pristine w 157k when purchased 161K now 83 300 D turbo 297K runs great. SOLD! 83 240D 4 spd manual- parted out then junked |
#12
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It's a vent. That is for overboost protection, if the boost sensor is tripped it closes that valve and vents the pressure at the ALDA and therefore cuts fuel. Safety feature, and why the car will surge badly at WOT if the wastegate is disconnected.
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#13
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Thanks folks.
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83 SD 84 CD |
#14
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There's a round switchover valve too that I think is part of the 124 HVAC system. What's that one do?
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LRG 1987 300D Turbo 175K 2006 Toyota Prius, efficent but no soul 1985 300 TDT(130K miles of trouble free motoring)now sold |
#15
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^ I would think the same thing.
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83 SD 84 CD |
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