Hey there,

So I am in the midst of working on my '85 300TD and have just replaced all the copper crush washers from the delivery valves on the injection pump. I put all the lines back together and am in the process of bleeding the air from the system.

According to the service manual I am to operate the hand pump until the bypass valve at the injection pump opens in which I will hear an audible rattling sound. My question is, usually just how many pumps does this take? I pumped about 20 times or so yet never heard anything. I am afraid to just keep pumping endlessly till I hear the sound as I am afraid of flooding the cylinders with fuel and introducing hyrdo-lock and doing damage to my engine. If this is even an issue in a diesel? This is my first diesel so I am a bit unsure.

So, if anyone has an idea of how much I should need to pump to clear out the injection pump, please let me know, thank you!

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1985 Mercedes-Benz 300TD 184k miles, Crème.