I'll be looking at a 300DT with a seized engine. I've got a line on a 617 long block. I was thinking of transferring over all the accessories from the seized engine, but don't know what to expect from the injection pump, turbo and vacuum pump that is on the seized engine. Thanks

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'81 300SD

It is likely that the only damage will be to your wallet. However, you need to find out what caused the engine to seize (sand in the oil?). Remember that the IP, turbo, and the vacuum pump are lubricated with engine oil.

Don't forget to thoroughly clean out the oil cooler and related hoses.

Jeremy

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"Buster" in the '95

Our all-Diesel family
1996 E300D (W210) . .338,000 miles Wife's car
2005 E320 CDI . . 113,000 miles My car
Santa Rosa population 176,762 (2022)
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"Oh lord won't you buy me a Mercedes Benz."
-- Janis Joplin, October 1, 1970

The oil pump failed.

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'81 300SD

The only way you will ever know is exploratory surgery. This is true with any engine rebuild. It's just impossible to know without disassembly, inspection and measurement of everything.

Good luck,

x2 on Larry Bible's comment.

Best case is a couple of rod-bearings at idle, turn the crank and sometimes save the rods, ... worst case if a camshaft seized and started it all the pistons crashed into valves plush the head can be trashed, crank can be damaged and in severe cases twisted slightly (affects timing) and rods trashed.

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Gone to the dark side

- Jeff

Not much else gets specifically destroyed by the engine seizing, but you have to worry about what made it seize in the first place (lack of oil). So how long was it running like that? I'd be most worried about the turbo.