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The idler gear in all Mini power units must be set with great care. The thrust washer comes in vaious thickness to allow for accurate setup. .136 THICKNESS
Thrust Washer Idler Gear Late .136 Red

Thrust Washer Idler Gear Late .136 Red

Thrust Washer Idler Gear Late .136 Red
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Thrust Washer Idler Gear Late .136 Red

Selected: .136"
Part No: DAM4824
$47.95
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Classic Mini
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Select variations below for more information:
.136"
$47.95
.132"
$43.95
.134"
$54.95
.138"
$54.95
.140-.141
$71.98
.142-.143
$73.98
.145-.146
$73.98
Alternate Products
Austin Mini Thrust Washer Idler Gear Late .134
$54.95 Austin Mini Thrust Washer Idler Gear Late .134
Thrust Washer Idler Gear Late .138 Blue
$54.95 Thrust Washer Idler Gear Late .138 Blue
The idler (intermediate) gear in the drive gears between the engine and transmission must have the end float set during any reassembly. The helical cut of these gears is designed to keep the noise down but also results in a side thrust that if not controlled will destroy the gearbox and flywheel housings. The end float of this gear is set by changing thrust washers with those of various sizes. The total end float should be keep between .003" to .006"
Shim for 1979-on idler gear with .875" pin diameter.
The idler (intermediate) gear in the drive gears between the engine and transmission must have the end float set during any reassembly. The helical cut of these gears is designed to keep the noise down but also results in a side thrust that if not controlled will destroy the gearbox and flywheel housings. The end float of this gear is set by changing thrust washers with those of various sizes. The total end float should be keep between .003" to .006"
The idler gear in all Mini power units must be set with great care. The thrust washer comes in vaious thickness to allow for accurate setup.

If you've installed the DAM4825 and still have too much end float with you A+ idler gear, we now have three sizes of oversized A+ idler shims available that are .002", .004", and .006" thicker that the largest factory size of .138/9".

This shim is the +.002" oversized version.

If you've installed the DAM4825 and still have too much end float with you A+ idler gear, we now have three sizes of oversized A+ idler shims available that are .002", .004", and .006" thicker that the largest factory size of .138/9".

This shim is the +.004" oversized version.

If you've installed the DAM4825 and still have too much end float with you A+ idler gear, we now have three sizes of oversized A+ idler shims available that are .002", .004", and .006" thicker that the largest factory size of .138/9".

This shim is the +.006" oversized version.

Related Technical Articles:
Classic Mini Idler gear - Setting end float
Classic Mini Idler gear - Setting end float
Created: December 04, 2001
A fairly crucial part of how the idler gear operates is its tolerances and running clearances. End float is a continual problem as folk often ignore it, and because many units left Rover with incorrect (usually too big) clearances.
Read Complete Article
ENGINE TRANSPLANTS - Engine to gearbox fitment
ENGINE TRANSPLANTS - Engine to gearbox fitment
Created: November 01, 2000
Assembling the engine to gearbox (transmission) is explained and simplified in this article. Contrary to popular mis-guidance, all BBUs will fit all four-syncro gearboxes. It was only the three-syncro boxes that varied in casting dimensions causing hassles where 1275s were applied to 850/998 gearbox casings. The longer throw and bigger crank and rod assembly dimensions fouled the sculpted areas in the gearbox case,
Read Complete Article
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