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4. APPLICATIONS
The use of a vacuum/pressure 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 VS403.V3 vacuum and pressure 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/pressure gauge readings.
5. OPERATION
5.1.
This hand pump and its adaptors can be used to test vacuum motors and control valves as well vacuum or pressure operated systems
and components that require to be properly sealed. The pump and its associated accessories can also be used to bleed brakes. In
pressure testing mode the pump may be utilised to dispense or transfer liquids and provide slight pressure during gravity or pressure
bleeding.
The VS403.V3 can be used for both pressure and vacuum testing by means of the sliding sleeve selector at the front end of the pump.
To select PRESSURE TESTING mode, move the sliding sleeve away from the nozzle end of the pump until it makes contact with the
main body. See fig.2(A) above. The hole indicated at 'X' must be fully covered.
To select VACUUM TESTING mode, move the sliding sleeve away from the main body of the pump until it makes contact with the 'O'
ring just behind the nozzle. See fig.2(B) above. The hole indicated at 'X' must be fully revealed.
(1) READING: 16 - 21inHG
DIAGNOSIS: NORMAL
© Jack Sealey Limited
fig.2
(2) READING: When the
throttle is suddenly opened
then released, the needle
should drop to below 5
inHg then bounce up to
approximately 25 inHg
before settling back to the
original reading.
DIAGNOSIS: NORMAL
Original Language Version
(3) READING: Extremely
low but steady
DIAGNOSIS: Leaking
intake manifold system,
Faulty manifold gasket or
carburettor base gasket,
split vacuum hose, seized
open EGR valve.
(4) READING: Reading
low but steady
DIAGNOSIS: Retarded
ignition timing. Confirm
using timing light and
reset to manufacturer's
specification.
VS403.V3
Issue: 4 (H,F) 17/05/23
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