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Old 09-12-2008, 11:52 AM
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Join Date: Nov 2007
Location: Snohomish, Washington
Posts: 47
Unhappy Interior engine rust - beyond help?

I've been hesitating to post this, but my $100 1976 240D (very good body and most else) has rust in the valve train, with some showing on the injector tips too. I bought this as a project and am not hesitant to replace the engine (if I can find one, that is). Before all that, is there some net wisdom on derusting an engine that works? I haven't really reefed on it yet, but preliminary attempts to manually crank over at crankshaft are failing. Rings could have become one with cylinder walls - ycch.

Any hope for this one? Or, have a beer and get on with my life .....

1981 300D 202K daily driver
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Old 09-12-2008, 12:40 PM
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Join Date: Dec 2003
Location: Festus MO
Posts: 762

What do you have to lose? It's junk now, correct?

Pour some ATF into the injector holes, let it soak in for a couple of days. Then try to turn it over by hand.

Once you can get it to turn by hand, then hook up the starter, fire it up, and drive away.

'93 190E/D 2.5 Turbodiesel 5-speed (daily driver)
'87 190D 2.5 Turbo rustbucket - parts car
'84 Dodge Rampage diesel - Land Speed Record Holder
'13 Ram 2500 Diesel
'05 Toyota 4Runner
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Old 09-12-2008, 12:43 PM
rrgrassi's Avatar
mmmmmm Diesel...
Join Date: Jun 2006
Location: Royse City Tx
Posts: 4,872
Marvel Mystery or even PB Blaster type stuff in a pourable container should work. Just change the engine oil.

70's SPM #5608 Fairmont A-4 MOW car

06 VW Jetta TDI 210K miles

03 VW Golf TDI 5 speed 372K Miles

RIP--Lost in fire...82 300D 322K was My Daily Driver-On the search for a w126 now...

90 Dodge D250 5.9 Cummins/5 speed. 350K
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Old 09-12-2008, 10:16 PM
oldiesel's Avatar
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Join Date: May 2007
Location: florida
Posts: 677
Marvel mystery oil gets my vote for stuck pistons and rings,take out the injectors and pour a 1/4cup in each cylinder.Let it sit a week or so if it gets so you can turn it with a wrench be sure to cover the injector holes with rags and spin the engine with the starter before you put the injectors back in. Don

Red Green "This is only temporary,Unless it works!"

97 E300D 157000 miles
87 300TD ?141k? miles
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