62638 Compression Test Kit
Product Information
The product is a compression tester used for testing the
compression levels of gasoline engines. It has a pressure scale of
0-300 PSI / 0-20 BAR and a push button release air release type.
The hose fitting is M10, M12, M14, M18 (Male, With O Ring) and the
hose size is 1/2 Diameter x 20 Long. The product comes with an
owner’s manual that provides safety instructions, assembly,
operating, inspection, maintenance, and cleaning procedures.
Product Usage Instructions
- Before using the product, read the entire important safety
information section in the owner’s manual. - Ensure that the product is intact and undamaged when unpacking.
If any parts are missing or broken, call 1-888-866-5797 as soon as
possible. - Prepare the engine for compression testing by starting the
engine and allowing it to warm up to its normal operating
temperature. Then, switch off the ignition. - Note that performing a compression test requires the work of
two individuals; one person to operate the vehicle’s ignition
switch while the other person operates the Compression Tester. - Block drive wheels before use and set parking brake. For manual
transmission, put gear selector in neutral and for automatic
transmission, put it in park. - Attach the Compression Tester to the engine’s spark plug
hole. - Press the Compression Tester’s button to release air and obtain
a reading of the engine’s compression level. - After using the product, inspect it before every use and do not
use if parts are loose or damaged. - Wear ANSI-approved safety goggles during use and use the Tester
only in well-ventilated areas to avoid carbon monoxide
poisoning. - Maintain labels and nameplates. If unreadable or missing,
contact Harbor Freight Tools for a replacement.
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 (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.
23a
Visit our website at: http://www.harborfreight.com Email our technical support at: [email protected]
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© 2022 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.
Tools required for assembly and service may not be included.
Read this material before using this product. Failure to do so can result in serious injury. SAVE THIS MANUAL.
Specifications
Pressure Scale Air Release Type Hose Fitting Hose Size
0 <-> 300 PSI / 0 <-> 20 BAR Push Button Release M10, M12, M14, M18 (Male, With “O” Ring) 1/2″ Diameter x 20″ Long
IMPORTANT SAFETY INFORMATION
1. Block drive wheels before use.
9. Maintain labels and nameplates
Set parking brake and put
on the Compression Tester.
gear selector in neutral for
These carry important information.
manual transmission or park
If unreadable or missing, contact
for automatic transmission.
Harbor Freight Tools for a replacement.
Risk of sudden vehicle movement! 10. People with pacemakers should
2. Read vehicle’s service
consult their physician(s) before
manual before use.
use. Electromagnetic fields in close
3. Keep away from hot or moving engine parts.
4. Use with gasoline engines only. Do not exceed gauge range.
proximity to heart pacemaker could cause pacemaker interference or pacemaker failure. Caution is necessary when near coil, spark plug cables, or distributor of
5. Secure connections before use.
running engine. Engine should be
off during distributor adjustment.
6. Inspect before every use;
do not use if parts loose or damaged. 11. The warnings, precautions, and
instructions discussed in this manual
7. Wear ANSI-approved safety
cannot cover all possible conditions
goggles during use.
and situations that may occur.
8. Use the Tester only in well-ventilated
The operator must understand that
areas. A running gasoline engine
common sense and caution are factors,
produces carbon monoxide.
which cannot be built into this product,
Carbon monoxide is a colorless,
but must be supplied by the operator.
odorless, gas that can cause
serious injury or death.
Page 2
For technical questions, please call 1-888-866-5797.
Item 62638
Instructions
Read the ENTIRE IMPORTANT SAFETY INFORMATION section at the beginning of this document before set up or use of this product.
NOTE: Performing a compression test requires the work of two individuals; one person to operate the vehicle’s ignition switch while the other person operates the Compression Tester.
1. Prepare the engine for compression testing by starting the engine and allowing it to warm up to its normal operating temperature. Then, switch off the ignition. WARNING! TO PREVENT SERIOUS INJURY: Avoid carbon monoxide poisoning! Never run a gasoline engine in an enclosed garage or other contained area.
2. Once the engine has been turned off, disconnect both coil wires from the coil of the engine. Insulate coil wires or route them away from each other and all metal surfaces.
3. Remove all of the spark plugs. Make note of which spark plug wires go to each spark plug locations.
4. Attach either the Adapter Fitting or Hose and Hose Fitting to the Gauge.
5. Connect the Compression Tester to the first cylinder of the engine. With the gas pedal pressed all the way down, crank the engine for at least eight revolutions.
6. While cranking the engine, observe the Gauge. Record the maximum reading.
7. After recording the maximum reading, stop cranking the engine. Then, release the air pressure in the Gauge by pressing the Air Release Button.
8. Remove the Compression Tester from the first engine cylinder. Then repeat Steps #5, #6, and #7 for the remaining engine cylinders.
NOTE: Good engine cylinder compression will be indicated with a high initial reading, and a progressive build-up to the final maximum reading. Poor engine cylinder compression will be indicated with a low initial reading, and a much slower build-up to the final maximum reading. The compression readings for all of the engine cylinders should not vary by more than 10%. Check service manual for acceptable pressure ranges.
Parts List
Part
1 2 3 4 5 6 7 8
Description
Gauge Hose Angled Adapter Fitting Straight Adapter Fitting M18 Hose Fitting M14 Hose Fitting M12 Hose Fitting M10 Hose Fitting
Record Serial Number Here:
Note: If product has no serial number, record month and year of purchase instead.
Note: Some parts are listed for illustration purposes only, and are not available individually as replacement parts. Reference UPC 193175487391.
Item 62638
For technical questions, please call 1-888-866-5797.
Page 3
PLEASE READ THE FOLLOWING CAREFULLY
THE MANUFACTURER AND/OR DISTRIBUTOR HAS PROVIDED THE PARTS LIST 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.
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.
26677 Agoura Road · Calabasas, CA 91302 · 1-888-866-5797
