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Old 09-06-2003, 05:20 PM
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Join Date: Jul 2003
Posts: 99
Engine Block Plug '83 300D Turbo

I'm going to flush my cooland system, anyone know where the engine plug is and what size it is? Thanks

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Old 09-06-2003, 06:21 PM
engatwork's Avatar
Join Date: May 2000
Location: Soperton, Ga. USA
Posts: 13,573
17 mm socket with extension or a long box end. Under the turbo toward the fire wall. Make sure you have a new crush ring.
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Old 09-07-2003, 12:23 AM
Mr Goodfahrt's Avatar
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Join Date: Sep 2003
Location: Maryland
Posts: 136
Just did mine too... tough to find

1982 300D Turbo... NEWBIE

I just did this for the first time myself. Couldn't find it on my own from above, but a Mercedes tech showed me where it was while on the lift. You can not see it from above, but if you touch and follow the copper pipe coming out of the bottom of the air filter housing, it will lead you to it. If you MUST do it from above without a lift or jacks, disconnect the intake pipe into the air filter housing (no tools needed) to give your arm some room. Also, be VERY careful NOT to lean on the overflow hose coming out of the radiator. I broke the nipple off from leaning on it for leverage and am having a heck of a time fixing it.

TECH TIP... the MB techs use SHOUT (that's right... the stuff from the grocery store) in a 1/1 or 1/3 mixture for internally degreasing the engine before using a descaler or flush chemical. Mercedes recommends a 10% citric acid (quite weak.. ie white vineger is 5% ascetic acid). They usually don't bother with the Shout unless they have replaced a head gasket or something, but you may want to do it at least once. MB in their manual says it is critical before doing a chemical flush or descaling. Also, it is important to remove the thermostat in order to do a proper flush and rinse, but you must put the seal back in or it will leak there.

Do multiple flushes between each stage including running the engine up to temperature with the heater on full blast for 5 minutes or so.
After this procedure your engine will smell sweet as your fresh laundry!!!

And finally, do yourself a favor and do an engine steam clean or degrease before you begin. It is really messy down there!

I'm sure this is more than you bargained for but I wanted to share my experience with you. Have fun!

Mr Goodfahrt

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