INSTRUCTIONS FOR:
CATALYTIC CONVERTER BACK PRESSURE
TEST KIT
MODEL No: VSE953
3. OPERATION
2. INTRODUCTION AND SPECIFICATION
IMPORTANT: Always refer to the vehicle manufacturer’s service instructions, or proprietary manual to establish the current procedure and
data.These instructions are provided as a guide only.
Ensure all Health and Safety, local authority, and general workshop practice regulations are strictly adhered to when using product.
Maintain tools in good and clean condition for best and safest performance. DO NOT use test kit if damaged.
Account for all tools and parts being used and do not leave them in, or on the engine after use.
Ensure you have read and understood the safety aspects of dealing with the fuel injection system and petrol in general before commencing.
Personal / Operation
Wear approved eye protection. A full range of personal safety equipment is available from your Sealey dealer.
Keep yourself, clothing and test equipment away from all moving or hot engine parts.
Do not wear jewellery and tie back long hair.
Before performing a test with the engine running (unless the manufacturer's manual states otherwise), set the parking brake and place the
gear selector in neutral or park, and block the drive wheels.
Exhaust gas contains deadly poisonous gases. The test area must be well ventilated - route the exhaust gas outdoors.
Used to establish the working condition of the catalytic converter and silencer by measuring the relative back pressure of the system. Simply
connect into the exhaust system using either of the two oxygen sensor dummy adaptors supplied in the kit. Gauge features a colour coded scale
for easy diagnosis and reads both pressure and vacuum so can be used on other areas of the vehicle allowing testing of low pressure fuel systems
or engine vacuum. Supplied with gauge hanging chain to allow hands free operation.
Model No: ..................VSE953
Contents: ..................Oxygen Sensor Adaptors M12x1.25, M18x1.5
Small & Large Brass Cone Adapters
Plastic Double Ended Cone
Plastic 'T' Piece
Gauge Hanging Chain
Gauge Scale: ...............Pressure 0-10psi
Vacuum 0-60cmHg
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.
IMPORTANT: PLEASE READ THESE INSTRUCTIONS CAREFULLY. NOTE THE SAFE OPERATIONAL REQUIREMENTS, WARNINGS AND 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. PLEASE KEEP INSTRUCTIONS SAFE FOR FUTURE USE.
Original Language Version
© Jack Sealey Limited
VSE953 Issue 1 - 19/06/13
3.1. TESTING THROUGH THE OXYGEN SENSOR PORT
Note: See section 4 for part numbers and description of each item.
WARNING! Exhaust systems can get very hot and testing should be carried out when the engine is cold to avoid injury (burns) and
so the rubber hose on the tool does not get too hot and distort. Testing should be completed within 5 minutes of the engine being
started from cold. Allow the engine to cool before removing the Oxygen sensor adaptors because these will be very hot and could
cause injury.
Note: Before replacing any suspected blocked exhaust components ALWAYS refer to the vehicle manufacturer's specifications to
obtain the correct pressure limits.
Note: Disconnecting the Oxygen sensor or running the engine with the sensor disconnected may cause the vehicle to illuminate
the MIL (Malfunction Indicator Light) which will require an EOBD diagnostic tool to reset it.
3.1.1. If there are two or more oxygen sensors, start testing at the one nearest the engine and proceed 'downstream'. Disconnect the oxygen
sensor wires and remove the oxygen sensor.
3.1.2. Install the oxygen sensor adaptor (refer to section 4).
3.1.3. Connect the rubber hose and gauge (see fig.1) onto the oxygen sensor adaptor.
3.1.4. Start the engine and allow it to idle, the reading should not register over 1psi in the Green scale. If the gauge registers over this pressure,
stop the engine, locate the restriction and correct the fault (see 3.2).
3.1.5. If the idle reading is NOT above 1psi, rev the engine to 2500rpm. The reading should not register over 2.5psi, if the gauge registers over this
pressure, stop the engine, locate the restriction and correct the fault (see 3.2)
3.1.6. If the vehicle has more than one exhaust pipe, with two catalytic converters, each will need to be checked.
3.2. TESTING THE CATALYTIC CONVERTER
3.2.1. If a blocked catalytic converter is suspected, test again after the converter using the second oxygen sensor (post cat) port. If the
converterisblockedthegaugewillreadalowerpressurethantherstsensor(precat)port.Forexample,iftherstoxygensensorport
reads 4psi and the second oxygen sensor reads 0.5psi, this shows a blocked catalytic converter.
3.3. TESTING VEHICLES WITHOUT OXYGEN SENSORS
3.3.1. Ifthevehicleisn'tttedwithoxygensensorsortheycan'tberemoveditispossibletodrillasmallholeinthesideoftheexhaustpipe,(away
from any welds and NOT into the catalyst), and use one of the brass cone adaptors (see section 4.6 and 4.7) to obtain a reading. After
testingthesmallholewillrequirellingwitheitherasmallselftappingscreworweld.
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