GROUP

NUMBER

General Information

Technical Service Bulletin
SUBJECT:

DATE

20-GI-009H
MODEL(S)

DECEMBER 2020

ALL

ENGINE BEARING CLEARANCE TESTER
CALIBRATION PROCEDURE

Description: This bulletin provides the calibration procedure for the engine bearing clearance tester.
The bearing clearance tester is already pre-calibrated, but additional calibration may be required due to
variable shop compressor air pressure when testing engine rod bearing wear.

NOTICE
The bearing clearance tester requires connection to a known good air supply during use.
 Shop air supply must consistently provide at least 50 PSI of air pressure to the tester.
 Do NOT use a portable air compressor.
 Be sure to check that the shop air water separator is functioning correctly.

NOTICE
For Bearing Clearance Tester software related issues, contact GITA at: 888-437-0308
For Bearing Clearance Tester hardware related issues, contact Techline at: 800-325-6604

Circulate To: General Manager, Service Manager, Parts Manager, Warranty Manager, Service
Advisors, Technicians, Body Shop Manager, Fleet Repair

SUBJECT:

ENGINE BEARING CLEARANCE TESTER CALIBRATION PROCEDURE

SST Information:
TOOL NAME

PART NUMBER

Engine Bearing Clearance Tester
(Main Body)

KQ231-2T100QQH

Spark Plug Rod
(Connection for Clearance Gauge)

KQ231-2T101QQH

Crankshaft Rotator Tool

KQ231-2T102QQH

Clearance Gauge

KQ231-2T103QQH

Power Supply Cable

KQ231-2T104QQH

Test Hose
(Air Hose for Clearance Gauge)

KQ231-2T105QQH

FIGURE

NOTE: Normal Warranty Applies.

NOTICE
Before performing the calibration procedure, verify that the power cable or air hoses are
NOT attached to the bearing clearance tester, and that the power switch is set to the OFF
position.

Calibration Procedure:
1.

Remove the two, smaller hex screws located
on the bearing clearance tester cover.
Hex Screw: 2.5mm hex

TSB #: 20-GI-009H

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2.

ENGINE BEARING CLEARANCE TESTER CALIBRATION PROCEDURE

Remove the four, larger hex screws located
on each side of the bearing clearance tester
cover.
Hex Screw: 3.0mm hex

3.

Lift and remove the bearing clearance tester
cover.

4.

Verify the power switch is OFF.

5.

Follow the EXACT power cable and air
hose connection order:
1) Connect the main air compressor hose.
2) Connect the 12V power cable to a stable
power source (a fully charged 12 volt
battery or an external AC/DC 13.8 volt
power supply).
3) Connect the test hose.
(The other end of the test hose should be
left disconnected from the spark plug
rod.)

TSB #: 20-GI-009H

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6.

ENGINE BEARING CLEARANCE TESTER CALIBRATION PROCEDURE

Turn the power switch ON, and select the
AP/VC switch to VC.
 AP: Pressure
 VC: Vacuum

NOTICE
To verify power to main unit solenoids:
 Toggle the AP/VC transfer switch
between AP VC.
 During toggling, a “click” noise will
indicate the solenoids are active.
7.

Inspect the VC gauge, and verify that the
reading is between -73 ~ -83kPa.

NOTICE
A red overlay on the gauge will indicate
the recommended specification.
If the VC gauge is within specification,
proceed to Step 9.
8.

If the VC gauge is NOT within specification,
pull the VC knob upwards to activate it.
Twist the VC knob to increase (+) or
decrease (-) the kPa reading until the
reading is within specification.
Clockwise: increases (+) kPa reading
Counterclockwise: decreases (-) kPa
reading
After twisting the knob until the kPa reading
is within specification, press the knob
downwards to deactivate and lock the knob.

9.

With the power switch still ON, select the
AP/VC switch to AP.
AP: Pressure
VC: Vacuum

TSB #: 20-GI-009H

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10.

ENGINE BEARING CLEARANCE TESTER CALIBRATION PROCEDURE

Inspect the AP gauge, and verify that the
reading is between 0.1 ~ .11MPa.

NOTICE
A blue overlay on the gauge will
indicate the recommended specification
If the AP gauge is within specification,
proceed to Step 12.
11.

If the AP gauge is NOT within specification,
pull the AP knob upwards to activate it.
Twist the AP knob to increase (+) or
decrease (-) the MPa reading until the
reading is within specification.
Clockwise: increases (+) MPa reading
Counterclockwise: decreases (-) MPa
reading
After twisting the knob until the MPa reading
is within specification, press the knob
downwards to deactivate and lock the knob.

12.

Turn the power switch OFF.

13.

Follow the EXACT power cable and air
hose disconnection order:
1) Disconnect the 12V power cable.
2) Disconnect the test hose.
3) Disconnect the main air compressor
hose.

14.

Reinstall all parts in reverse order of
removal.

15.

The calibration procedure is now complete.

TSB #: 20-GI-009H

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