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Old 07-28-2015, 09:33 AM
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Location: Bucks County, PA
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New to me w115 300D first service

I have a new to me 1975 w115 300D that I will be bringing to a local independent MB shop for a good look over today. What are some things that should be inspected for this vehicle? It has 120,000 miles. I don't have great service records for it but it seems the previous two owners kept it in generally good condition. I am pretty green when it comes to cars and especially diesels. At the least I will get the oil changed as well as the fuel filters changed. Some known issues:

Transmission hesitates or won't shift from 1st to 2nd without letting off the gas.
Oil leaking from behind the cluster (I think) in to the driver foot well.

Fluid leaks which I dont think are oil as it is not black, possible power steering, transmission or brake fluid or a combination of those.

Any help or suggestions are appreciated.

Last edited by mpofpa; 07-28-2015 at 11:08 AM.
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Old 07-28-2015, 10:56 AM
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Two possibilities for the oil leak.

Check the oil line. They can develop a leak at the connection or the gauge.

The diaphragm at the injection pump itself can leak, allowing oil to enter the system where it leaks from the switch under the dash. The oil can appear anywhere under the dash depending on what it is leaking onto (vacuum lines, wiring bundle, etc.). This can be a PITA. Not only are those diaphragms pricey but you need to flush the vacuum lines with denatured alcohol.

The first sign of a ruptured diaphragm is usually a delayed shut-down.
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Old 07-28-2015, 11:11 AM
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I have read that the pressure line to the oil gauge can leak or from the gauge itself. In that case would the gauge still show full pressure with the engine running? The engine doesn't hesitate to stop when the ignition is turned off. Thanks.
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Old 07-28-2015, 11:16 AM
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It can.
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Old 07-28-2015, 06:09 PM
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Some good things to check on a new diesel would be:
Valve adjustment
While they have the valve cover off, check the timing chain stretch.
Replace all fluids and filters, brake, coolant, fuel filters, air filter. PS fluid i know you have issues going on there.
One very good thing to check that is often overlooked is make sure the oil cooler lines aren't deteriorated and leaking. Those can fail causing catastrophic loss of engine oil.
Once you get these teething problems sorted out, the car will run and run and run.
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Old 07-29-2015, 10:30 AM
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Thanks for all of the advice. The first thing the mechanic suggested when making the appointment was to do a valve adjustment so that makes sense. I dropped it off yesterday after taking a ride with the mechanic. He recommended replacing the bushings in the shifter. There are some issues with the transmission shifting from first to second and he also suggested using an additive when replacing the trans fluid. Fingers crossed, waiting to hear back today after he gets a closer look.
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