Maddox MH5-1 Instructions de montage
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Owner’s Manual & Safety Instructions
Save This Manual Keep this manual for the safety warnings and precautions, assembly,
operating, inspection, maintenance and cleaning procedures. Write the product’s serial number in the
back of the manual near the assembly diagram (or month and year of purchase if product has no number).
Keep this manual and the receipt in a safe and dry place for future reference. 19f
When unpacking, make sure that the product is intact
and undamaged. If any parts are missing or broken,
please call 1-888-866-5797 as soon as possible.
Copyright© 2019 by Harbor Freight Tools®. All rights reserved.
No portion of this manual 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 manual may not be drawn proportionally. Due to continuing
improvements, actual product may differ slightly from the product described herein.
To ol s r eq ui r ed f o r as s em bl y a nd se rvice m ay not be in cluded.
Read this material before using this product.
Failure to do so can result in serious injury.
SAVE THIS MANUAL.
Page 2 For technical questions, please call 1-888-866-5797. Item 64918
Specifications
Maximum Input Air Pressure 100 PSI
Gauge Scale 0 –100 PSI in 2 PSI increments
0 –700 kPa in 10 kPa increments
Included Spark Plug Adapters 10 mm, 12 mm and 18 mm Adapters
Adapter Hose 24" with 14 mm threads
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. Prevent accidental starting. Turn
off engine and disconnect ground
(negative) battery cable before use.
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.
Page 3For technical questions, please call 1-888-866-5797.Item 64918
13. Stay alert. Watch what you are
doing, use common sense. Do not
operate any tool when you are tired.
14. Replacement parts and accessories.
When servicing, use only identical
replacement parts. Use of any
other parts will void the warranty.
15. 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.
16. Maintenance. For your safety, service
and maintenance should be performed
regularly by a qualified technician.
17. 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.
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 PSI and
converted to a percentage of loss.
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.
Page 4 For technical questions, please call 1-888-866-5797. Item 64918
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 PSI
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 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 difference of 5 PSI
between cylinders is acceptable.
A larger difference of 10 to 15 PSI
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. Take several
readings and average the results for
a recorded reading for each cylinder.
5. 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.
6. The lower the sound pitch of
escaping pressure indicates a larger
leak. Small leaks will typically
make a higher pitched sound.
7. If the engine has multiple problems, the
Cylinder Leak-Down Tester may show
only the most pronounced problems.
A large problem may overwhelm a
smaller problem during testing.
Operating Instructions
Read the ENTIRE IMPORTANT SAFETY INFORMATION section at the
beginning of this document including all text under subheadings therein
before set up or use of this product.
WARNING! Always run an engine in a
well ventilated space. Running engines
produce Carbon Monoxide, a colorless,
odorless gas which can cause serious
personal injury or death if inhaled.
WARNING! Wear protective gloves and
ANSI-approved eye protection when
working on a hot engine. Keep hands
away from the fan and other moving parts,
and protect yourself from electrical shock
or burns. Be aware that working on a
gasoline engine is inherently dangerous,
and suitable precautions must be taken.
1. Turn the Pressure Regulator Knob
fully counterclockwise before
connecting the Cylinder Leak-
Down Tester to a pressurized
air source. Failure to do so may
result in damage to the tool.
2. 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 and disconnect ground
(negative) battery cable before testing
to prevent accidental starting.
Page 5For technical questions, please call 1-888-866-5797.Item 64918
3. Before removing the spark plugs,
clean the area around the spark
plugs using compressed air.
It is important to prevent foreign
materials from falling into the cylinders
once the spark plugs are removed.
4. Disconnect the coil wire from the
coil, and remove all spark plugs.
Note the position of the wires so that the
correct wire may be replaced on each
plug at the end of the job. On engines
with two spark plugs per cylinder,
remove only one plug per cylinder.
5. Remove the oil dipstick, radiator
cap, and disconnect one end of
the PCV hose. If the engine has a
carburetor, remove the air cleaner and
open the throttle all the way. If the
engine is fuel injected, remove the air
cleaner or open the throttle body.
6. Position the cylinder to be tested
at TDC on the compression stroke
so all valves are closed.
7. Install correct size Spark Plug
Adapter onto end of Adapter Hose,
then thread Adapter with attached
Hose into spark plug hole of cylinder
to be tested. Connect the male
end of the Adapter Hose to the
female coupler on the Tester.
8. Turn the Pressure Regulator Knob
fully counterclockwise. Connect
a compressed air source (not
included) to the air inlet plug on
the Cylinder Leak-Down Tester.
9. Turn the Regulator Knob clockwise
until the regulated Pressure Gauge
reaches desired input test pressure.
Make sure the test pressure used
is 10 PSI less than the maximum
pressure produced by the air source,
but not greater than 100 PSI.
NOTICE: DO NOT operate this Tester
with the input air pressure set higher than
100 PSI, which can damage the tool.
10. The pressure in the cylinder being
tested is indicated on the Leakage
Gauge. The amount of leakage
in the cylinder is determined by
comparing the difference in pressure
between the two gauge readings.
11. Turn the Pressure Regulator Knob
fully counterclockwise before
disconnecting the Adapter Hose. Test
the remaining cylinders to determine
which cylinders are bad, if any.
12. Use the diagnostic techniques
in the next section to determine
the cause of the problem.
SUPERIOR AUTOMOTIVE TOOLS
Page 6 For technical questions, please call 1-888-866-5797. Item 64918
Diagnostic Techniques
If one or more cylinders are identified as
having 10 to 15 PSI greater compression
loss than the others, you can listen for
escaping air pressure to diagnose the
problem. Air escaping at the following
locations indicates a potential problem.
1. Oil dipstick tube indicates pressure
escaping from the cylinder into the oil
jacket. This usually indicates stuck,
burned or worn rings or cylinder walls.
2. Carburetor or fuel injector
intake indicates stuck, burned
or worn intake valve.
3. Radiator filler opening bubbles or
sound indicates pressure escaping into
the coolant jacket. This can indicate
cracked cylinder walls or a damaged
head gasket. In case of a damaged
head gasket, often two or more adjacent
cylinders will show the same problem.
4. Adjacent cylinder indicates a
damaged head gasket.
5. Tail pipe indicates stuck, burned
or worn exhaust valve.
Maintenance and Servicing
1. BEFORE EACH USE, inspect the
general condition of the tool. Check for:
• loose hardware
• misalignment or binding
of moving parts
• cracked or broken parts
• any other condition that may
affect its safe operation.
If any abnormality is found, have the
problem corrected before further use.
2. AFTER EACH USE, wipe external
surfaces of the tool with clean cloth.
3. Periodically check the
threads for damage.
4. Keep clean and free from dirt,
grease and grit.
5. Release the pressure from
the gauge before storing.
6. Store tool in its case when not in use.
PLEASE READ THE FOLLOWING CAREFULLY
THE MANUFACTURER AND/OR DISTRIBUTOR HAS PROVIDED THE PARTS
LIST AND ASSEMBLY DIAGRAM IN THIS DOCUMENT AS A REFERENCE
TOOL ONLY. NEITHER THE MANUFACTURER OR DISTRIBUTOR MAKES ANY
REPRESENTATION OR WARRANTY OF ANY KIND TO THE BUYER THAT HE
OR SHE IS QUALIFIED TO MAKE ANY REPAIRS TO THE PRODUCT, OR THAT
HE OR SHE IS QUALIFIED TO REPLACE ANY PARTS OF THE PRODUCT. IN
FACT, THE MANUFACTURER AND/OR DISTRIBUTOR EXPRESSLY STATES THAT
ALL REPAIRS AND PARTS REPLACEMENTS SHOULD BE UNDERTAKEN BY
CERTIFIED AND LICENSED TECHNICIANS, AND NOT BY THE BUYER. THE BUYER
ASSUMES ALL RISK AND LIABILITY ARISING OUT OF HIS OR HER REPAIRS TO
THE ORIGINAL PRODUCT OR REPLACEMENT PARTS THERETO, OR ARISING
OUT OF HIS OR HER INSTALLATION OF REPLACEMENT PARTS THERETO.
Page 7For technical questions, please call 1-888-866-5797.Item 64918
Parts List and Diagram
Part Description
1 Regulated Pressure Gauge
2 Leakage Gauge
3 Pressure Regulator Knob
4 Cover Plate
Part Description
510 mm Spark Plug Adapter
612 mm Spark Plug Adapter
718 mm Spark Plug Adapter
8Adapter Hose with 14 mm threads
12
3
5
4
8
6
7
Record Serial Number Here:
Note: If product has no serial number, record month and year of purchase instead.
Note: Some parts are listed and shown for illustration purposes only,
and are not available individually as replacement parts.
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. This warranty does not apply to damage due directly or
indirectly, to misuse, abuse, negligence or accidents, repairs or alterations outside
our facilities, criminal activity, improper installation, normal wear and tear, or to lack of
maintenance. We shall in no event be liable for death, injuries to persons or property,
or for incidental, contingent, special or consequential damages arising from the use
of our product. Some states do not allow the exclusion or limitation of incidental or
consequential damages, so the above limitation of exclusion may not apply to you. THIS
WARRANTY IS EXPRESSLY IN LIEU OF ALL OTHER WARRANTIES, EXPRESS OR
IMPLIED, INCLUDING THE WARRANTIES OF MERCHANTABILITY AND FITNESS.
To take advantage of this warranty, the product or part must be returned to us
with transportation charges prepaid. Proof of purchase date and an explanation
of the complaint must accompany the merchandise. If our inspection verifies
the defect, we will either repair or replace the product at our election or we may
elect to refund the purchase price if we cannot readily and quickly provide you
with a replacement. We will return repaired products at our expense, but if we
determine there is no defect, or that the defect resulted from causes not within the
scope of our warranty, then you must bear the cost of returning the product.
This warranty gives you specific legal rights and you may also
have other rights which vary from state to state.
26541 Agoura Road • Calabasas, CA 91302 • 1-888-866-5797
SUPERIOR AUTOMOTIVE TOOLS
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