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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.

Thrust Washer Idler Gear Late A+ .004 Oversized, .142-143

Thrust Washer Idler Gear Late A+ .004 Oversized, .142-143

Thrust Washer Idler Gear Late A+ .004 Oversized, .142-143
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Thrust Washer Idler Gear Late A+ .004 Oversized, .142-143

Selected: .142-.143
Part No: DAM4825-004
$73.98
Qty:
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Fits the following:
Classic Mini
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Select variations below for more info:
.142-.143
$73.98
.138"
$45.95
.134"
$20.65
.136"
$19.47
.132"
$46.95
.140-.141
$71.98
.145-.146
$73.98
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.
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. .136 THICKNESS
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.

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 +.006" 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.

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Recommended items for: DAM4825-004
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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.
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ENGINE TRANSPLANTS - Engine to gearbox fitment
ENGINE TRANSPLANTS - Engine to gearbox fitment
Created: November 01, 2000
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Read Complete Article