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Old 05-05-2002, 11:19 PM
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Join Date: Feb 2002
Location: SF Bay Area
Posts: 131
A/C compressor belt lose

I found my A/C compressor belt a bit lose.
How can I tighten it up? Which bolt(s) for adjustment?
Thank you.


1985 300D Turbo

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Old 05-05-2002, 11:38 PM
jbaj007's Avatar
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Join Date: Jun 2001
Location: Santa Monica, CA
Posts: 2,053
300SD 1984 (should be similar)

Three 19 mm. bolts on the rear of the alloy compressor mount that secure the compressor... loosen them slightly from below.

Go topside. One 10mm. locknut below A/C hoses on the alloy compressor mount towards driver side fender well. Long bolt protruding thru nut helps identify it. You need deepwell 10mm socket (because of long bolt) if you can get by the hoses that join at the compressor manifold. Open end 10mm from the front if you can't. Clockwise on the nut tightens the belt. It's a short belt so not much deflection should be there, but not so tight as to stress the clutch/pulley bearing.

Tighten up what you loosened below.
The Golden Rule

1984 300SD (bought new, sold it in 1988, bought it back 13 yrs. later)
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Old 05-06-2002, 07:06 PM
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Join Date: Feb 2002
Location: SF Bay Area
Posts: 131
Thank you, jbaj007

My friend helped me to tighten up the belt this afternoon, using your instructions.

Thanks again


1985 300D Turbo

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