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Serpentine Belt Tensioner Tool | Cooper S
Safety Precautions - Please Read
Use tool (A) to lever the tensioner
back ensuring the pins fit properly
into the holes in the tensioner arm
and the ¾ round pivot bracket
fits fully over the tensioner pivot
mounting.
Insert the belt tensioner pin (C)
(4mm) to hold the tension so that
the belt can be removed without
having to maintain any further
pressure on the tool.
4770
Serpentine Belt Tool Kit
BMW Mini
• Do not run the engine with the serpentine belt removed.
• When checking the belt fit, it is best practice to remove the spark plugs to make turning
the engine easier.
• Observe all tightening torques.
• Do not use cleaning fluids on belts, sprockets or rollers
• Do not lever or force the belt onto its sprockets
• Do not use locking pins to lock the engine when slackening or tightening the crankshaft
pulley bolts
ALWAYS REFER TO THE VEHICLE MANUFACTURERS WORKSHOP MANUAL
This tool set simplifies the removal and replacement of the
Serpentine Belt when servicing | repairing the W10 | W11 1600cc
engines as used in the Mini One | Cooper | Cooper S
(pre. 2007 | Mk1), Mini Convertible (pre 2009 | Mk1).
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Application General Instructions
BMW Mini One | Cooper | Cooper S 1.6 Petrol engines (MK1)
W10B16AA | W10B16BA | W11B16AA engines
Gain Access to Serpentine Belt
• Remove the engine under tray
• Remove the right front wheel
• Remove the right front inner wheel arch to
allow access to the lower serpentine belt
pulleys
• Remove the fuel tank evaporative control
valve (mounted on front right hand end of
the engine)
Serpentine Belt Tensioner Tool | Mini One | Cooper (B)
• Use Tool (B) to lever the tensioner away
from the belt ensuring the claw fits properly
onto the end of the tensioner arm.
• With the tensioner levered fully back insert
pin (D) (4.5mm) into the tensioner to hold
the tensioner free of the belt and aid
removal and fitting of the belt.
Layout ID Component Code OEM Ref Description
A C435 11 8 410 Serpentine Belt Tensioning Tool - Cooper S
B C438 11 8 390 Serpentine Belt Tensioning Tool - Cooper | Mini One
C C436 11 8 470 Belt Tensioner Locking Pin 4mm
D C437 11 8 280 Belt Tensioner Locking Pin 4.5mm
Instructions for Use
Always refer to the vehicle manufacturer’s service manual or a suitable proprietary
instruction book.
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Warning – Incorrect fitting of the serpentine belt could result in engine damage. It is
strongly recommended that the engine be rotated after fitting a new belt to ensure the belt
is correctly fitted and aligned.
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