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.
Copyright© 2006 by Harbor Freight Tools®.
All rights reserved. No portion of this document 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
Specifications
Adapters |
12mm and 14mm |
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Included |
Spark Plug Adapters |
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Gauges |
2½ IN. dia. rubber protected |
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0 to 100 PSI in 2 PSI |
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Gauge Scale |
increments; 0 - 7 bar in |
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0.2 bar increments |
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Maximum |
100 PSI |
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Air Pressure |
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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. Do not use electrically powered tools in the presence
of flammable gases or liquids.
Be aware of the inherent dangers of working on a gasoline engine.
3.Keep children away.
Children must never be allowed in the work area. Do not let them handle machines, tools, or extension cords.
4.Store idle equipment. 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.
5.Use the right tool for the job. This cylinder tester is intended for use in gasoline powered engines. Do not modify this tool and do not use this tool for a purpose
for which it was not intended.
6.Dress properly. Do not wear loose clothing or jewelry as they can be caught in moving parts. Protective,
electrically nonconductive clothes and nonskid footwear are recommended when working. Wear restrictive hair covering to contain long hair.
7.Wear ANSI-approved impact safety goggles when working on gasoline engines.
8.Be sure to work in a well ventilated place, or pipe exhaust gasses to the outdoors. Guard against exposure to Carbon Monoxide, which is an odorless, colorless gas produced by gasoline engines. Carbon Monoxide exposure may cause serious injury or death.
9.Do not overreach. Keep proper footing and balance at all times. Do not reach over or across running machines.
10.Maintain tools with care. Keep tester threads sharp and clean for better
and safer performance. Follow instructions for lubricating and changing accessories. The gauge hose and adapters must be kept clean, dry, and free from oil and grease at all times.
11.Stay alert. Watch what you are doing, use common sense. Do not operate any tool when you are tired.
12.Check for damaged parts. Before using any tool, any part that appears damaged should be carefully checked to determine that it will operate properly and perform its intended function. Any part that is damaged should be properly repaired or replaced by a qualified technician.
13.Replacement parts and accessories. When servicing, use only identical replacement parts. Use of any
other parts will void the warranty.
14.Do not operate tool if under the influence of alcohol or drugs.
Read warning labels on prescriptions to determine if your judgment or reflexes are impaired while taking drugs. If there is any doubt, do not operate the tool.
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For technical questions, please call 1-800-444-3353. |
SKU 94190 |
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.WARNING: The brass components of this product contain lead, a chemical known to the State of California
to cause birth defects (or other reproductive harm). (California Health & Safety code 25249.5, et seq.)
18.The warnings, cautions, and instructions discussed in this instruction manual cannot cover all possible conditions and situations that may occur. It must be understood by the operator that common sense and caution are factors which cannot be built into this product, but must be supplied by the operator.
SAVE THESE
INSTRUCTIONS.
About Cylinder Leak Testing
A Cylinder Leak-Down Tester can give you valuable information about the engine’s compression. Pressurized air is supplied to each cylinder, and the rate of leakage is
measured in percent loss from 0% to 100%.
The operator may also locate the source of the compression loss by listening at these places:
a.Oil dipstick tube for leaking cylinder rings.
b.Radiator fill cap for cylinder wall cracks.
c.Adjacent port for head gasket leaking.
d.Tailpipe for exhaust valve leaks.
e.Carburetor air horn for intake valve leakage.
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.
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.
2.If the Gauge shows very high or 100% compression loss, the cylinder may not be at Top Dead Center (TDC)
on the compression stroke.
Make sure the cylinder is at TDC, so the
SKU 94190 |
For technical questions, please call 1-800-444-3353. |
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