IMPORTANT: PLEASE READ THESE INSTRUCTIONS CAREFULLY. NOTE THE SAFE OPERATIONAL REQUIREMENTS, WARNINGS & CAUTIONS. USE
THE PRODUCT CORRECTLY AND WITH CARE FOR THE PURPOSE FOR WHICH IT IS INTENDED. FAILURE TO DO SO MAY CAUSE DAMAGE AND/OR
PERSONAL INJURY AND WILL INVALIDATE THE WARRANTY. KEEP THESE INSTRUCTIONS SAFE FOR FUTURE USE.
VACUUM TESTER & BRAKE BLEEDING KIT
MODEL NO: VS4021.V2
Thank you for purchasing a Sealey product. Manufactured to a high standard, this product will, if used according to these instructions,
and properly maintained, give you years of trouble free performance.
Refer to
instructions
Wear protective
gloves
Wear eye
protection
1. SAFETY
9 Keep this product in good working order and condition, take immediate action to repair or replace damaged parts.
9 Use approved parts only. Unapproved parts will invalidate the warranty.
9 Keep children and unauthorised persons away from the work area.
9 Keep work area clean and tidy and free from unrelated materials.
9 Ensure the work area has adequate lighting.
8 DO NOT use the kit to perform a task for which it is not designed.
8 DO NOT hold pump inlet against the skin whilst using the pump.
8 DO NOT allow untrained persons to use the kit.
8 DO NOT use whilst under the inuence of drugs, alcohol or intoxicating medication.
9 After use, clean equipment and store in a cool, dry, childproof area.
WARNING! Brake uid will damage paintwork. Any spillage should be ushed with water immediately.
WARNING! Brake uid is ammable - keep away from sources of ignition, including hot surfaces e.g. exhaust manifold.
9 Dispose of waste liquids in accordance with local authority regulations.
WARNING! DO NOT pollute the environment by allowing uncontrolled discharge of uids.
9 Always read and comply with the warnings on the brake fluid container.
9 Wear eye protection and keep skin contact to a minimum. If brake fluid enters eyes rinse with plenty of water and seek medical advice.
IMPORTANT: If swallowed seek medical advice immediately.
2. INTRODUCTION
Multi-function diagnostic tool used to test a variety of essential engine and associated functions including fuel, ignition, transmission and
emissions. Kit also includes reservoir, hoses and adaptors for bleeding brake and clutch systems on cars, commercials and motorcycles. Brassbodied vacuum pump features large, easy-to-read vacuum gauge calibrated in both inches and millimetres of mercury.
3. CONTENTS
ITEM PART No. DESCRIPTION
1 VS402.V3-01 VACUUM PUMP WITH GAUGE
2A VS402.V3-02A RESERVOIR LID (FOR OPERATION)
2B VS402.V3-02B RESERVOIR LID (FOR TRANSPORT)
3 VS402.V3-03 RESERVOIR JAR
4 VS402.V3-04 560mm VACUUM HOSE
5 VS402.V3-05 80mm VACUUM HOSE
6 VS402.V3-06 HOSE ADAPTOR
7 VS402.V3-07 HOSE ADAPTOR ‘T-PIECE’
8 VS402.V3-08 HOSE ADAPTOR ‘STRAIGHT’
9 VS402.V3-09 BRAKE BLEED NIPPLE ADAPTOR
10 VS402.V3-10 UNIVERSAL CUP ADAPTOR
© Jack Sealey Limited
Original Language Version
VS4021.V2 | Issue 2 (F,2,3) 26/02/19
4. OPERATION
The use of a vacuum gauge is often overlooked when determining mechanical condition and carrying out fault diagnosis on internal combustion
engines. Monitoring actual manifold vacuum is invaluable when troubleshooting engine faults. This can only be carried out by using a good
quality vacuum gauge and this, coupled with a hand-operated vacuum pump, also allows static testing of all types of vacuum operated systems.
Set out on the following pages are applications that the VS4021 vacuum tester kit can be used for, but it must always be remembered that these
are examples only and reference to manufacturer’s service manuals should always be made for correct testing procedures and specifications.
In addition to this, it is always recommended that additional tests, i.e. compression tests, cylinder leakage tests, ignition timing checks etc. be
carried out to confirm indications of vacuum gauge readings.
5. INLET MANIFOLD SYSTEMS
5.1. ANALYSING ENGINE MECHANICAL CONDITION VIA MANIFOLD VACUUM READINGS
5.1.1. The readings shown below are only examples of what may be observed.
IMPORTANT: Remember that it is the action of the needle rather than
the actual reading that is more important. Varying engine types will run
different manifold vacuum pressures, depending on camshaft profile,
valve overlap, timing etc. so an exact vacuum reading cannot be
specified.
The main criteria is that the needle reading is between 16 to 21 inHg
and steady.
5.1.2. Manifold vacuum is also affected by altitude and it will drop
approximately 1inHg for every 1000 feet above sea level so this must
also be considered when assessing manifold vacuum actual readings.
5.2. BASIC DIAGNOSTIC TESTS
5.2.1. Carry out the following procedures:
Step 1. Run engine until normal operating temperature is reached.
Switch engine off.
Step 2. Connect the vacuum gauge to a port directly on the manifold (fig.1) or on the carburettor/throttle body below the throttle
butterfly.
Step 3. Start and run the engine at idle, observing the gauge reading. Refer to the following table to indicate any problems and their
possible causes.
g.1
READING: 16-21 inHg with needle
steady.
CAUSE: Normal.
READING: Reading low but steady.
CAUSE: Retarded ignition timing.
Conrm using timing light and reset
to manufacturer’s specication.
© Jack Sealey Limited
READING: When the throttle is
suddenly opened then released the
needle should drop to below 5inHg
then bounce up to approx. 25 inHg
settling back to original reading.
CAUSE: Normal.
READING: Reading slightly low and
uctuating slowly.
CAUSE: Over lean or rich mixture.
Check and reset in accordance with
manufacturer’s specications.
Original Language Version
READING: Reading extremely low but
steady.
CAUSE: Leaking manifold intake
system, faulty manifold gasket,
carburettor base gasket, split vacuum
hose, EGR valve seized.
READING: Regular uctuation
between normal and low readings.
CAUSE: Blown cylinder head gasket
between two adjacent cylinders. Carry
out cylinder leakage test.
VS4021.V2 | Issue 2 (F,2,3) 26/02/19
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