Please Help 1968 220D - Page 5 - Mercedes-Benz Forum

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post #41 of 91 (permalink) Old 09-17-2011, 08:03 AM
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As long as the vacuum line is hard plastic and the same diameter, it should be OK. Make sure the connection to the bolts at the intake valve and pomp side is very good and does not leak.

I've read in the FSM that idle speed should be first set under no-load situation (transmission in P, no A/C of fan etc.). If that is done, than proceed to put the transmission in D and the A/C on, and adjust idle if necessary to keep the engine running. Engine should be warm, but not hot (60º-80º C or 140F-175F).
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post #42 of 91 (permalink) Old 09-17-2011, 09:31 PM Thread Starter
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That's another thing on the to-do list.
I need a new temperature sender for my coolant temp. guage. The wires are broken off at the engine block.

Thanks a million for that info, though. Great stuff.
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post #43 of 91 (permalink) Old 09-18-2011, 07:54 AM
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That's a mechanical gauge on the '68 unless you are referring to the 100 degree sender used to turn on the auxiliary fan. It uses a capillary tube to transmit the temperature to the gauge itself.
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post #44 of 91 (permalink) Old 09-25-2011, 03:10 PM Thread Starter
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Went to replace vacuum line, and couldnt find hard plastic vacuum line.
Apparently doesnt exist in wenatchee, but Auto Zone told me to use some rubber vacuum line. I did. Went home, hooked it up, and tried to start it.

When I run the starter, it starts strong for a few revolutions, then slowly gets weaker and weaker. Charged battery. Same effect.

Got a new battery and it does the same.

Any clues to this one?

UPDATE: Cleaned battery terminals and tried starting with the block heater. No difference.
I did notice that the glow plug lamp/salt shaker did not get nearly as bright as it used to, and it shut off alltogether after about 15 seconds. I don't remember it doing that before.

Last edited by goatmurray; 09-25-2011 at 09:48 PM.
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post #45 of 91 (permalink) Old 09-26-2011, 12:16 AM
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The starting problems are something electrical. Have you cleaned the ground connection to the chassis?

Soft rubber hose is not advisable for the vacuum line to the pump, because the hose will expand and contract under influence of vacuum, governing of the engine will not be as precise.
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post #46 of 91 (permalink) Old 09-26-2011, 05:48 AM
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Go to Ace hardware or similar. They have hard vinyl lines there, used in irrigation lines, refrigerator ice makers, etc.
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post #47 of 91 (permalink) Old 09-26-2011, 06:10 AM
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The MB part number for the vacuum hose from intake manifold to the pump is A6150700632. It is still available from MB.
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post #48 of 91 (permalink) Old 09-29-2011, 04:47 PM Thread Starter
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Cleaned ground connection to chassis.
It helped some.
Starter turns over pretty quick like it used to, but glow plug light doesnt get nearly as bright, and shuts off after about 20-25 seconds now.

I'm going to go out and clean the glow plug contacts now.
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post #49 of 91 (permalink) Old 09-30-2011, 07:45 PM Thread Starter
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Cleaned contacts on glow plugs. No dice.

I'd feel better if I could just get the glow plug indicator to light up like itused to...
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post #50 of 91 (permalink) Old 10-02-2011, 11:37 AM
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It might be the starter knob or one of the glow plugs.
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