Diesel Engine Specific Aid

1985 300 SD turbo diesel Auxillary Fan Not Working

n/a Auxillary fan for air conditioning system will not energize. Car overheats when using air conditioning in traffic. Fan is new, fuse C has been checked. climate control is newly rebuilt. Air is cold fan is working on all speeds. Read somewhere that the auxillary fan is controlled by temperature switch at drier. Is this correct? How do I go about diagnosing the problem. Thanks

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1976 300D ho-hum fuel mileage

Car is getting 20-23 MPG and can not seem to get much improvement. This was the mileage when I started, and have since adjusted the valves (nice wrenches, Kent!), changed the fuel filters, replaced all fuel lines (they were hard and looked leakish), installed Monarch nozzles set to 1620PSI (great kit!). After all of that, it runs like a dream with not much smoke, but still the same ho-hum mileage.

I tested an injector before I cleaned, re-sealed and installed the Monarchs. It popped at about 1400 and shot a straight jet. After cleaning, sealing, shimming and installing the monarchs, they all pop at 1620 and shoot a nice smokey atomized pattern. I was sure this would do it, but there was virtually no change other than in smoothness.

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Missing Vac Switch in ALDA line.

I have a 1979 W116 300SD, chassis has 334k miles and rebuilt engine around 100k. When I purchased the car, the vac switch that attaches to the firewall that helps control the ALDA valve is missing. I have read various articles describing the pro and cons. I am afraid to 'step' on it in fear of what may happen. Should I replace the switch? Or what would you do?

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1983 300SD vacuum diagnosis

Hi, All,

I have isolated a vacuum problem to the red/green plastic line that services (I think) interior switches and servos: with this red/green line attached to its fitting on the vac system, system pressure drops from 45m/g to 15m/g or less with the engine running. When the car is turned OFF, the line holds vacuum (??); when the car is ON, its as if it's open on the other end, bleeding off vacuum (brakes go hard after 2-3 pumps; engine won't shut off if at idle awhile).

Does this behavior suggest a specific component that I should go after?

Thanks in advance!

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1983 300d white smoke, no power

need help. i have a 1983 300d 150k on the clock. hard start when cold, heavy white smoke through out operating temperture, no power. compression at 330psi all cylinders.check diesel fuel, ok. replaced all fuel filters and in tank screen. replaced all glow plugs,relay. replaced all injector nozzles. replaced all fuel hoses and plastic lines. problem still exist.performed timing chain stretch. Found 6 degrees after tdc. any ideas?

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220D vacuum line tap

I have a '71 220D with a mystery vacuum tap on the main line between vacuum pump and power brake booster.
It's unconnected, and there's also a disconnected hard line up by the firewall, but it doesn't have the length to connect to the brake-line tap. (These are the only vacuum fittings on the car.) That line is split by some sort of check valve or diaphragm/filter, and it disappears under the driver's side fender, right under the windshield corner. It's green, and it doesn't seem to reappear under the dash.
I thought at first it had something to do with the windshield-washer pump, but that's foot-operated, and I've successfully reconnected that.
Any idea on what the mystery line/tap is? I've got some MercedesSource hard line and fittings to reconnect things, but how and what?

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Mixing injector cores when rebuilding?

I need to rebuild the injectors on my 1979 300TD, and I have a set of Monarks that I ordered here. I have access to a pop-tester and a shim kit.

I asked my mechanic about obtaining cores so I could do the rebuild at my leisure. He sold me ($50) a mixed set of turbo and non-turbo injectors, after measuring them and deciding it would work.

I don't think he's correct. I suspect the springs in the turbo injector bodies are stronger, and that no amount of shim removal is going to get me the required pop pressure.

Can you confirm or deny?

thanks!!

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