ACtion Magazine - March 2014 - (Page 31)
Mini Cooper overheating
By Jacques Gordon
2002-06 R-53 Mini Cooper S,
W-11 engine
The W-11 engine in the first-generation Mini Cooper S has an Eaton M-45
supercharger. It's driven by the same
belt that drives the A/C compressor and
alternator. The engine's water pump is
mounted on the outlet end of the supercharger and is driven by a shaft from a
power take-off (PTO) gear in the supercharger housing. The drive gears and the
PTO gears are both in sealed gear cases
and lubricated by special oil that is also
permanently sealed in the cases: there is
no oil flow through the gear cases.
Supercharger maintenance is not
mentioned in the owner's manual or any
maintenance schedules, and while the
M-45 is known to be reliable, Mini enthusiasts report that the oil seal in the PTO
gear case starts leaking at about 100,000
miles. When that seal leaks, oil is slowly
sucked out of the case and into the engine. The first clue to this is a whining/
growling noise from the supercharger
when the gears finally run dry, but many
owners won't notice. There may also be
a rattling noise as the pump drive wears,
and eventually the gears strip and the
water pump stops turning. That's when
the engine begins overheating, often the
owner's first clue to the problem.
The fix is to rebuild the supercharger, hopefully before the gears and water
pump drive are destroyed. Kits may still
be available, but the PTO gears are no
longer made by Eaton. There is at least
one shop, AutoXCooper near Chicago
(www.autoxcooper.com), that rebuilds
the M-45 using upgraded seals and bearings, and they have contracted a machine
shop to make new gears. They can also
repair the water pump drive. ❆
AutoXCooper photo
2005-08 R-52 Mini Cooper S
Convertible, W-11 engine
Damaged water pump drive gears
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Reader Reply March 2014 * ACtion
31
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Table of Contents for the Digital Edition of ACtion Magazine - March 2014
Coolant pump replacement
Computer controls for Air conditioning replacement
Outlook
Freeze Frame
Leonard's Law
Virtual View
Service Port
Last Watch
By the Numbers
Cooling Corner
Industry News
Association News
New Products
ACtion Magazine - March 2014
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