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#1
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124 noise at Idle
Between 600 and 650 rpm, there is a grating sound at what appears to be around the water pump. No leakage is evident around the pump. 700 and up, noise goes away. Coincidentally, I had the serpentine belt replaced a few months ago and the noise became evident after the replacement.
Is this the beginning of a water pump failure?
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Walter Sawczak 1990 300 E 1993 Lincoln Mark VIII 1983 Jaguar XJ6 |
#2
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could also be (the common) fan clutch bearing bracket
with engine off - try to rock the pully for the fan back and forth - or with engine on try to (carefully) get a sthescope down nearby bases to hear better sometimes it's better just to wait for it to fail and be ready
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-Marty 1986 300E 220,000 miles+ transmission impossible (Now waiting under a bridge in order to become one) Reading your M103 duty cycle: http://www.peachparts.com/shopforum/831799-post13.html http://www.peachparts.com/shopforum/831807-post14.html |
#3
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When the noise appears, stick a screwdriver blade into the top bushing mount of this damper and twist to tighten the bushing.. if noise goes away, top bushing is bad/worn......very common..
http://catalog.eautopartscatalog.com/mercedesshop/sophio/wizard.jsp?partner=mercedesshop&clientid=catalog.mercedesshop&baseurl=http://catalog.peachparts.com/&cookieid=1M30LAGSC1VF188OT0&year=1990&make=MB&model=300-E-002&category=G&part=Acc.+Belt+Tension+Damper |
#4
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I bet Arthur is right. Happened on 2 M103's I have owned. Sounds like marbles when the hood is opened.
No harm, just annoying. Steve |
#5
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Dam... now I've got it...
__________________
-Marty 1986 300E 220,000 miles+ transmission impossible (Now waiting under a bridge in order to become one) Reading your M103 duty cycle: http://www.peachparts.com/shopforum/831799-post13.html http://www.peachparts.com/shopforum/831807-post14.html |
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