Spicer Kingpin Bushings – Pre-Size vs. Reamable User Manual

Spicer

Axles & Brakes

ABIB-0305

Information Bulletin

Bulletin Type: Service/Parts

Topic: Kingpin Bushings – Pre-Size vs. Reamable

Affected Models: E-1000I/W, E-1200I/W, E-1201W, E-1203I, E-1320I/W,

E-1460I/W, E-1462I, EFA-12F4, EFA-13F5

Dana Commercial Vehicle Systems Division has
released new steer axle kingpin service kits that
include new “PRE-SIZED” kingpin bushings. Using
these new service kits with pre-sized bushings
eliminates the need to dimensionally ream knuckle
bushings at installation.

Pre-sized bushings are different in one important way
from bushings that require reaming after installation.
Pre-sized bushings reply on the bushing tolerances
for the wall thickness and diameter to provide proper
kingpin installation and operating clearance.
Bushings that are reamed after installation reply only
on the additional reaming step to provide for kingpin
clearance. Final kingpin clearances will be slightly
greater with pre-sized bushings due to the bushing
tolerances.

No More Reaming or
Expensive Tooling

Dana’s 1320HD101
Pre-sized Bushing

®

Important: The larger maximum tolerance on the pre-sized bushings signify the possibility of a

looser fit at the time of assembly, this is acceptable.

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Below you will find the new allowable endplay measurement for pre-sized bushings. You will also find a
listing of benefits and differences between pre-sized and reamable bushings.

The endplay measurements taken after

•

assembly should not exceed .008” at the
“Top” or “Bottom” of the knuckle.

It is important to locate the dial indicator

•

at the correct locations on the knuckle
when taking endplay measurements.

Benefits of Pre-sized Bushings vs. Reamable Bushings

Longer bushing life by eliminating damage during reaming process

•

•

Shorter repair times means less down time on the vehicle

•

Eliminate expensive reaming tools

Differences Between Pre-sized Bushings vs. Reamable Bushings

•

Larger tolerances between kingpin and bushings

Pre-sized = .0057” Reamable = .0025”

Allowable endplay measurements for pre-sized bushings vs. reamable bushings

•

Pre-sized - .000” to .008” Reamable - .000” to .004”

Top of Knuckle Indicator
Location

Bottom of Knuckle Indicator
Location

2