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W164, OM642, afraid to hydrolock the engine

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Old 10-31-2019, 10:45 AM
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2009 ML 320 CDI
W164, OM642, afraid to hydrolock the engine



Hi, I am replacing the oil cooler seals on a 2009 ML320 diesel and I forgot to drain the coolant before removing the air intakes.
The result was some coolant migrating to the air intake holes.
I can remove some of the coolant from the intake holes but I am afraid I will not manage to remove 100%.
Is there a risk of hydrolocking the engine if some coolant gets inside the cylinders?
Attached some pictures.
Thank you for helping me.
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Old 10-31-2019, 12:05 PM
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83 300D 617T(retired), 96 E300 606n/a(retired), 99 E300 606T(retired), 07 E320 BT, 14 E3504M
Remove the glow plugs and unplug the CDI control unit then jump the starter relay until you are satisfied that the cylinders are free from coolant.

Nothing is likely to happen as is, depending on how much you dropped down there, but to be on the safe side, that's what I would do. Last time I quoted a reman 642 engine from MBZ it was around $17k. (Used ones are cheaper of course)

Better to be safe than broke!!

Also, side note, burnt and/or unburnt coolant and DPF's don't play together well, so keep that in mind.
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Old 10-31-2019, 01:06 PM
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Turn the engine by hand a few times with a wrench on the crankshaft, with injectors or glow plugs removed.
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Old 11-03-2019, 05:14 AM
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Thank you PGSurface, where is the CDI control unit? Is it the glow plug module or the Engine control module?
Or should I just start the car with the diesel injectors electrical cable unplugged?
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Old 11-03-2019, 05:18 AM
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Originally Posted by chassis
Turn the engine by hand a few times with a wrench on the crankshaft, with injectors or glow plugs removed.
Thank you but I am afraid by turning it slowly by hand the coolant would still be inside the cylinders.
I was wondering to start the car without the glow plugs and with the diesel injectors electrical cables unplugged.
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