Harbor Freight Tools 94190 Product manual
Cylinder Leak-
Down Tester
Item 94190
INSTRUCTIONS AND
PRECAUTIONS
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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
Specications
Adapters
Included
Gauges 2½ IN. dia. rubber protected
Gauge Scale
Maximum
Air Pressure
12mm and 14mm
Spark Plug Adapters
0 to 100 PSI in 2 PSI
increments; 0 ‑ 7 bar in
0.2 bar increments
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. Do not use electrically
powered tools in the presence
of ammable 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 qualied 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
inuence of alcohol or drugs.
Read warning labels on prescriptions to
determine if your judgment or reexes
are impaired while taking drugs. If there
is any doubt, do not operate the tool.
Page 2 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 qualied technician.
16. People with pacemakers should
consult their physician(s) before use.
Electromagnetic elds 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 ll 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 qualied 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
Page 3For technical questions, please call 1-800-444-3353.SKU 94190
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