I have two Mercedes 300Ds. One with a bad engine but o.k. body and one with
body damage but a nice engine. I plan on swapping the engine from the
damaged body/chassis to the undamaged.
At the crucial moment when the engine is sitting in a hoist and the
recipient car is partly torn down I start wondering if there are any little
gaskets/connectors/widgets way down deep in the engine bay that I should fix
while I'm in the vicinity. If this were a scuzzy old truck (which I'm more
used to) I'd be replacing rear main seals and everything in sight during the
transfer. For a smoothly running 300D I'm not so sure I need to do anything
special. I considered doing an engine rebuild even though the engine runs
fine (sort of a "preventative repair") but that seems too expensive to do
before it's required. (The good engine has 300,000 miles and runs great the
good body has 240,000 miles.)
My mechanic suggests I'm overreacting and should just swap engines and be
done with it. I'm sure he's right but like to make sure I'm not missing any
Any words of wisdom?
Replace the oil filter housing-to-engine gasket, turbo oil return tube seals,
crank seal front, vacuum pump-to-engine gasket, water pump, and engine shutoff
In the car- engine mounts, trans cooler lines, trans front pump seal, engine
oil cooler lines.
425 White Horse Pike
Hopefully both cars are of the same model year so their emission
controls are identical.
Suggest you treat yourself to new motor mounts while you have the engine
out AND, if these are turbo engines replace the hoses to the oil cooler
as these are tough to do after the engine is installed. Also, replace
the turbo's oil drain line's "O" ring seals where it enters the
IMHO there's no benefit opening a 300K mile engine unless you're going
to completely overhaul it. Meanwhile you have the marginal engine to
overhaul for the day when the 300K engine is kaput.
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