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Water pump oil port

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Old 03-29-2021, 11:26 AM
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Water pump oil port
Was replacing the water pump this weekend and was surprised to see this oil port on the left side - just sort of makes a pass through the housing - I guess to cool off a little. Was wondering if that is accurate, or if there is some other function? The oil was a little funky compared to the recently replaced oil that I’m seeing on the dipstick.




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Old 03-30-2021, 12:16 PM
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Before you removed the pump did you look at the color in the coolant reservoir? What color was it?

When you removed the pump, what was the color of the coolant?
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Old 03-31-2021, 12:02 AM
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All good blue coolant. Just had recently replaced it a few weeks ago before the water pump started acting up. You can see a small amount still in the port on the lower right.
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Old 03-31-2021, 03:29 AM
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What ML are we dealing with, the 550 or the 350? If it's the 350 is it Gas eng. or CDI?
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Old 03-31-2021, 08:49 AM
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It’s the 550.
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Old 03-31-2021, 11:34 AM
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Your 550 is a 272 eng. with a turbo, right?
Last edited by Maj. Dundee; 04-01-2021 at 08:09 AM.
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Old 04-03-2021, 09:34 AM
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I think so, but I’m not sure how to look it up

vin is 4JGBB7CB0AA581600
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Old 04-04-2021, 02:52 AM
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Have you replaced the water pump?

How many hoses did you remove to replace the pump PHOTOS please?
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Old 04-04-2021, 11:39 PM
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Just the lower hose. See pic. Upper hose connects to the thermostat.


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Old 04-05-2021, 02:29 AM
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I asked two simple questions and you only answered one. Have you replaced the water pump?
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Old 04-05-2021, 10:12 AM
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Sorry, missed that first question. Yes, was installing a new water pump - see original post.
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