User manual CHICAGO 94190

[. . . ] Children must never be allowed in the work area. Do not let them handle machines, tools, or extension cords. When not in use, tools must be stored in a dry location to inhibit rust. Always lock up tools and keep out of reach of children. [. . . ] f) Fuel injector body for intake valve leakage. If you are not experienced in doing this type of diagnostic test, the work should be done by a qualified technician. REV 03/07 SKU 94190 For technical questions, please call 1-800-444-3353. Page 4 Important Considerations About Compression Loss Testing 1. There will always be some compression loss past piston rings, even in a new engine. You will never see a 0% compression loss, and this lost pressure should be audible at the oil dipstick port. If the Leakage Gauge shows very high or 100% compression loss, the cylinder may not be at Top Dead Center (TDC) on the compression stroke. Check to be sure the cylinder is at TDC, so the valves are closed. Reference your vehicle owner's manual for instructions on how to do this. A "good" reading will show compression loss of all cylinders at about the same rate. A large difference of 15% to 30% comparing one cylinder to the others indicates a problem. Leakage rate readings may vary by up to 10% when taking repeated readings of the same cylinder. Piston position and engine temperature can cause variable readings. Take several readings and average the results for a recorded reading for each cylinder. Diagnosing an engine problem with this tool involves using a listening device (not included). A length of hose or a mechanic's stethoscope are suggested. The lower the sound pitch of escaping pressure indicates a larger leak. Small leaks will typically make a higher pitched sound. If the vehicle has multiple problems, the Cylinder Leakage Tester may show only the most pronounced problems. A large problem may overwhelm a smaller problem during testing. 2. 3. 4. 5. 7. Operation IMPORTANT NOTE: Be sure the Regulator Knob (9) is turned fully counterclockwise before connecting the Cylinder Leakage Tester to a pressurized air source. Failure to do so may result in damage to the tool. NOTE: The engine must be at normal operating temperature for accurate testing. Start the engine and let it warm up to normal operating temperature, then turn it off for testing. CAUTION: Always run an engine in a well ventilated space. [. . . ] Keep this tool clean and free from dirt, grease or grit. Periodically check the threads for damage. Release the pressure from the gauge before storing. 7) 1) 6) 3) 2) Part 1 2 3 4 5 6 7 8 9 10 D escription Female Qui ck C onnector Metri c Adapter M14 x 1. 25 Metri c Adapter M18 x 1. 5 Extensi on Hose Gauge Base Leakage Gauge Pressure Gauge Male Qui ck C onnector Regulator Adapter Hose (wi th O-ri ng) (wi th O-ri ng) 8) 9) 5) 4) 10) REV 03/07 SKU 94190 For technical questions, please call 1-800-444-3353. Page 7 WARRANTY ® LIMITED 90 DAY WARRANTY Harbor Freight Tools Co. [. . . ]