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DIESEL SWAP WIRING/VACUUM QUESTIONS- FORUM NEWBIE
http://www.cardomain.com/ride/3215663
NEW TO THE FORUM!!! I have done a engine swap, and now I have a '78 300SD engine vs a gas one. I have done all the rewiring of the car. questions: 1- how is the diesel "pumped"? (electrical like the gas pump? or mechanically?) (I was told there is a pump on the rear of the car for diesels...is it inside the tank? or resides in engine compartment? 2- I see on the "control box" that there is one connector that powers up the 5 glow plugs, coolant sensor and temp (from the back of my head thinking) --- the other connector pin seems to only need the #6 red thick cable to constant power, the thin red one to switched power, ground? is this correct? my car does not have on the gauge panel temp light, etc... I used the blue/white wire for the glow plug warning light (installed remote location)---seems to work fine 3- Since my car was not diesel, I don't have a diesel shut down button/switch....any parts/advice....hard to find a shut-off button..or not looking in right places. (was also told i should change out the ignition switch housing for a diesel engine one.)---any tips/advice and how the vacuum is routed? 4- Will I need the Speed Control Sensor? I mean, is it necessary to have the car running properly or is it just so I can check the rpm on the car? apparently it senses TDC & rpm...just clarification. thanks!!! I was told you guys are the diesel experts. |
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Answer RE: engine swap, 1978 300SD engine vs a gasser
Here is a link with further data on your questions.
Fast navigation Do It Yourself Links Fast navigation Do It Yourself Links questions: 1- how is the diesel "pumped"? ANSWER: * The fuel is gravity feed up to the mechanical lift pump. * The mechanical lift pump is in the engine compartment (attached to the injection pump). 2- I see on the "control box" that there is one connector that powers up the 5 glow plugs, coolant sensor and temp (from the back of my head thinking) --- the other connector pin seems to only need the #6 red thick cable to constant power, the thin red one to switched power, ground? is this correct? my car does not have on the gauge panel temp light, etc... I used the blue/white wire for the glow plug warning light (installed remote location)---seems to work fine ANSWER: I need to see pictures of what you have done with this circuit, the description sounds correct. 3- Since my car was not diesel, I don't have a diesel shut down button/switch....any parts/advice....hard to find a shut-off button..or not looking in right places. (was also told i should change out the ignition switch housing for a diesel engine one.)---any tips/advice and how the vacuum is routed? ANSWER: * The ignition SWITCH should be changed to a diesel shut down unit. Vacuum Diagrams W123 and W126 models 4- Will I need the Speed Control Sensor? I mean, is it necessary to have the car running properly or is it just so I can check the rpm on the car? apparently it senses TDC & rpm...just clarification. ANSWER: * The tachometer is optional, but a very useful diagnostic tool. Have a great day.
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ASE Master Mechanic asemastermechanic@juno.com Prototype R&D/testing: Thermal & Aerodynamic System Engineering (TASE) Senior vehicle instrumentation technician. Noise Vibration and Harshness (NVH). Dynamometer. Heat exchanger durability. HV-A/C Climate Control. Vehicle build. Fleet Durability Technical Quality Auditor. Automotive Technical Writer 1985 300SD 1983 300D 1984 190D 2003 Volvo V70 2002 Honda Civic https://www.boldegoist.com/ |
#3
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#3:
The diesel shutdown on the ignition switch can be emulated by using a N.O. 12v solenoid (aka: Mercedes switchover valve) to pass vacuum to the shutdown valve when 12v to the solenoid is off (ignition switched power). This is what I'm planning for my gas > diesel 124 conversion.
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Gone to the dark side - Jeff |
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U GUYS ARE AWESOME!
I really appreciate all the help! This clears up the rest. I will try the switchover valve method. Gotta look at these vacuum diagrams before I try cranking her up! As for question #2, I dont have pics.. (loomed everything up already after the test)... basically it goes like this: #6 red at glow plug relay = Constant power (used pin 15 I believe on ign switch)- small thin wires on 6 pin connector: brown = grounded blue/white = to remote warning light (since I dont have a glowplug light on car) red= switched on power violet = not used (RPM I believe...my guage panel doesnt have it) green = not used (Temp light I believe...my car uses the copper line type) working modification... tips? ANYONE KNOW: a- where I can get a replacement line from engine to gauges for oil pressure? b- good way to convert vise-versa: from electrical temp sending to my meachanical coolant temp guage? |
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