Harbor Freight Tools 92720 operating instructions See Figure C, Figure B

5.Attach either the Adapter Fitting (2) or Hose (3) and Hose Fitting (4) to the Gauge (1). (See Figure A.)

6.Connect the Compression Tester to the first cylinder of the engine. With the fuel pedal depressed all the way down, crank the engine for at least eight revolutions.

(See Figure C.)

7.While cranking the engine, observe and record the maximum reading on the Gauge (1) of the Compression Tester. (See Figure C.)

8.Once the maximum reading has been recorded, discontinue cranking the engine. Then, release the air pressure in the Gauge (1) by pressing the Air Release Button. (See Figure C.)

9.Remove the Compression Tester from the first engine cylinder. Then repeat Steps #6, #7, #8 for the remaining engine cylinders. (See Figures B and C.)

10.NOTE: Good engine cylinder compression will be indicated with a high initial reading, and a progressive build-up to the final maximum reading. Poor engine cylinder compression will be indicated with a low initial reading, and a much slower build-up to the final maximum reading. The compression readings for all of the engine cylinders should not vary by more than 10%. Note: Check your owner’s or maintenance manual for acceptable pressure ranges.

COIL

COIL WIRES

FIGURE B

GAUGE

(1)

REMOVE	AIR RELEASE BUTTON
SPARK PLUGS

FIGURE C

SKU 92720 For technical questions please call 1-800-444-3353 PAGE 6