S-Class (W126) 1979-1991: 300 SE, 300 SEL, 380 SE, 380 SEL, 420 SEL, 500 SEL, 560 SEL, 360 SEC, 500 SEC, 580 SEC, 300 SD TURBODIESEL, 300 SDL TURBO, 350 SD TURBO, 350 SDL TURBO

W126 1991 H Reg 420 SEL - Squeal on acceleration

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Old 10-30-2019, 05:18 PM
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W126 Mercedes 420 SEL
W126 1991 H Reg 420 SEL - Squeal on acceleration

Hi All

Recently my 1991 H Reg W126 has a high pitched squeal on acceleration. It's intermittent, but happens more often than not, and appears to be worse the colder the weather is.

Other than the irritating noise, it seems to drive fine, but is quite embarrassing and I obviously want to get it sorted to avoid any potential damage.

Any thoughts on what it could be and remedies would be very appreciated

TIA all
Old 10-30-2019, 06:53 PM
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