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Cylinder Leak-

Down Tester

Item 94190

INSTRUCTIONS AND

PRECAUTIONS

Visit our website at:

http://www.harborfreight.com

Read this material before

using this product.

Failure to do so can result

in serious injury.

SAVE THIS MANUAL.

When unpacking, make sure

that the product is intact and

undamaged.

If any parts are missing or broken,

please call 1‑800‑444‑3353

as soon as possible.

2006 by Harbor Freight Tools

or any artwork contained herein may be

reproduced in any shape or form without the

express written consent of Harbor Freight

Tools. Diagrams within this document may

not be drawn proportionally. Due to continuing

improvements, actual product may differ slightly

from the product described herein. Tools required

for assembly and service may not be included.

For technical questions or replacement

parts, please call 1-800-444-3353.

Manual Revised 09b; 11c; 11f

Summary of content (8 pages)

PAGE 1
Cylinder LeakDown Tester Item 94190 INSTRUCTIONS AND PRECAUTIONS Visit our website at: http://www.harborfreight.com Read this material before using this product. Failure to do so can result in serious injury. SAVE THIS MANUAL. Manual Revised 09b; 11c; 11f When unpacking, make sure that the product is intact and undamaged. If any parts are missing or broken, please call 1‑800‑444‑3353 as soon as possible. Copyright© 2006 by Harbor Freight Tools®. All rights reserved.
PAGE 2
Specifications Adapters Included 12mm and 14mm Spark Plug Adapters Gauges 2½ IN. dia. rubber protected Gauge Scale 0 to 100 PSI in 2 PSI increments; 0 - 7 bar in 0.2 bar increments Maximum Air Pressure 100 PSI Important Safety Information 1. Keep work area clean. Cluttered areas invite injuries. 2. Observe work area conditions. Do not use machines or power tools in damp or wet locations. Don’t expose to rain. Keep work area well lighted.
PAGE 3
15. Maintenance. For your safety, service and maintenance should be performed regularly by a qualified technician. 16. People with pacemakers should consult their physician(s) before use. Electromagnetic fields in close proximity to heart pacemaker could cause pacemaker interference or pacemaker failure. Caution is necessary when near coil, spark plug cables, or distributor of running engine. Engine should be off during distributor adjustment. 17.
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valves are closed. Reference your vehicle service manual for instructions on how to do this. 3. 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. 4. 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.
PAGE 5
compressed air source (not included) at the male Quick Connector (8). head gasket, often two or more adjacent cylinders will show the same problem. NOTE: Set the air compressor’s regulator to 7 to 100 PSI. Never operate this tester with air pressure set higher than 100 PSI, which can damage this tool. 3. Adjacent cylinder indicates a damaged head gasket. 6. Turn the Regulator Knob (9) clockwise until the Gauge (6) reads “0” (zero) at the end of the yellow band. 5.
PAGE 6
Parts List and Diagram Part 1 2 3 4 5 6 7 8 9 10 Description Female Quick Connector Metric Adapter M12 x 1.25 (with O-Ring) Metric Adapter M14 x 1.5 (with O-Ring) Extension Hose Gauge Base Leakage Gauge Pressure Gauge Male Quick Connector Regulator Adapter Hose 1 7 6 2 3 4 5 8 10 9 Record Serial Number Here: Note: If product has no serial number, record month and year of purchase instead.
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Limited 90 Day Warranty Harbor Freight Tools Co. makes every effort to assure that its products meet high quality and durability standards, and warrants to the original purchaser that this product is free from defects in materials and workmanship for the period of 90 days from the date of purchase.
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3491 Mission Oaks Blvd.