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Old 10-18-2001, 09:23 PM
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Join Date: Mar 2001
Posts: 51
Where are coolant drain plugs on 560SL?

I want to change the coolant in my 1987 560SL. I know how to drain the radiator, but I understand the block needs to be drained as well. The service CD indicates there are two drain plugs on the block--one on each side of the engine, near the motor mounts. I'm not sure I've properly identified them. I see two possible choices--a 17mm bolt that threads into the side of the block, or a 6mm hex socket that screws into the block. Neither looks to be very accessible. Anyone know for sure where the plugs are located? Appreciate any help....John Downey
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Old 10-18-2001, 11:52 PM
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Join Date: May 2001
Posts: 104
It's the 6mm hex heads- the ones that point straight up. Don't take a bath getten them out . A long allen wrench is helpful. Do not remove the 17mm head bolts in the side of the block, bad things can happen.
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Old 10-19-2001, 07:17 AM
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Join Date: Mar 2001
Posts: 51
Drain Plugs on 560SL

Shooter: Thanks for the quick response. I kinda thought the hex head bolts were the ones. I tried to back one out last night but it was really tight--thought I would post a message and verify before breaking it loose. Looks almost like an aluminum plug--sure hope it isn't seized. I like the hex bolts when they are get up around 10mm or bigger--have a hard time getting necessary torque on the smaller ones. Guess I'll get after it today. Thanks again. John Downey
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