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#1
03-14-2008, 04:48 AM
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engine whine in 91 300E
Hey folks,
Just got my 1991 300E 24V back from my mechanic with a new head gasket. It idles a little slowly but more worrisome to me is a fairly loud whine that gets louder and higher with increasing revs. Any ideas what could cause the whining?
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Stirling500 1990 500SL 1996 G320 1992 Alpina B10 Biturbo 1997 BMW L7 www.Alpina.ca 
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#2
03-14-2008, 08:13 AM
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Don't drive the car OR run the engine!!!
Most likely the chain tensioner hasn't been installed properly! Have the valve cover removed & the chain checked for excessive tightness. When installing the tensioner it must be "RESET" & installed disassembled.
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MERCEDES Benz Master Guild Technician (6 TIMES) ASE Master Technician Mercedes Benz Star Technician (2 times) 44 years foreign automotive repair 27 Years M.B. Shop foreman (dealer) MB technical information Specialist (15 years) 190E 2.3 16V ITS SCCA race car (sold) 1986 190E 2.3 16V 2.5 (sold) Retired Moderator
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#3
03-14-2008, 10:10 PM
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You were right on the money. Thanks so much.
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Stirling500 1990 500SL 1996 G320 1992 Alpina B10 Biturbo 1997 BMW L7 www.Alpina.ca
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#4
03-15-2008, 06:59 AM
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Stirling, your mechanic should have realized something was wrong before returning the car to you. He needs remedial training on timing chain tensioners. Hopefully the installation of the head gasket and resealing of the upper timing chain cover were done correctly and oil leaks don't develop soon. I recommend you find another tech for future repair work. Fortunately you sensed something was wrong and M.B.DOC's advice prevented a major problem this time.
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Fred Hoelzle
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