SEALEY VSE953 Catalytic Converter Back Pressure Test Kit User Manual

SEALEY VSE953 Catalytic Converter Back Pressure Test Kit

Product Information

Specifications

• Model Number: VSE953
• Product Name: Catalytic Converter Back Pressure Test Kit

Introduction
Thank you for purchasing the Sealey Catalytic Converter Back Pressure Test Kit. This product is manufactured to a high standard and, if used according to the instructions provided, and properly maintained, it will give you years of trouble-free performance.

Safety
It is important to prioritize safety when using this product. Please adhere to the following safety guidelines:

• Always refer to the vehicle manufacturer’s service instructions or proprietary manual for the current procedure and data.
• Strictly adhere to all Health and Safety, local authority, and general workshop practice regulations.
• Maintain the test kit in good and clean condition for the best and safest performance. Do not use if damaged.
• Account for all tools and parts being used and do not leave them in or on the engine after use.
• Read and understand the safety aspects of dealing with the fuel injection system and petrol before commencing.
• Wear approved eye protection and other personal safety equipment available from your Sealey dealer.
• Keep yourself, clothing, and test equipment away from all moving or hot engine parts.
• Avoid wearing jewelry and tie back long hair.
• Before performing a test with the engine running (unless stated otherwise in the manufacturer’s manual), set the parking brake, place the gear selector in neutral or park, and block the drive wheels.
• Ensure the test area is well-ventilated to route the exhaust gas outdoors, as it contains deadly poisonous gases.

Contents

Operation

Environment Protection
It is recommended to recycle unwanted materials instead of disposing of them as waste. All tools, accessories, and packaging should be sorted and taken to a recycling center for proper disposal compatible with the environment. When the product becomes completely unserviceable and requires disposal, drain any fluids (if applicable) into approved containers and dispose of the product and fluids according to local regulations.

Register Your Purchase
To ensure warranty coverage, please register your purchase. The guarantee for this product is 12 months from the purchase date, and proof of purchase is required for any claim.

FAQ

• Q: Can I use this test kit on any vehicle?
  A: 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.

• Q: What precautions should I take when using the test kit with the engine running?
  A: Before performing a test with the engine running (unless the manufacturer’s manual states otherwise), set the parking brake, place the gear selector in neutral or park, and block the drive wheels. Additionally, ensure the test area is well-ventilated to route the exhaust gas outdoors, as it contains deadly poisonous gases.

• Q: How should I dispose of the product?
  A: When the product becomes completely unserviceable and requires disposal, drain any fluids (if applicable) into approved containers and dispose of the product and fluids according to local regulations. It is recommended to recycle unwanted materials instead of disposing of them as waste.

• Q: What is the warranty period for this product?
  A: The warranty for this product is 12 months from the purchase date, and proof of purchase is required for any claim.

CATALYTIC CONVERTER BACK PRESSURE TEST KIT

MODEL NO: VSE953
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 & 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.

SAFETY

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.
• 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.

INTRODUCTION

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 color-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.

CONTENTS

OPERATION

TESTING THROUGH THE OXYGEN SENSOR PORT

NOTE : See section 3 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.

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.
2. Install the oxygen sensor adaptor (refer to section 3).
3. Connect the rubber hose and gauge onto the oxygen sensor adaptor.
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.
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.
6. If the vehicle has more than one exhaust pipe, with two catalytic converters, each will need to be checked.

TESTING THE CATALYTIC CONVERTER

1. If a blocked catalytic converter is suspected, test again after the converter using the second oxygen sensor (post cat) port. If the converter is blocked the gauge will read a lower pressure than the first sensor (pre cat) port. For example, if the first oxygen sensor port reads 4psi and the second oxygen sensor reads 0.5psi, this shows a blocked catalytic converter.

TESTING VEHICLES WITHOUT OXYGEN SENSORS
If the vehicle isn’t fitted with oxygen sensors or they can’t be removed it is possible to drill a small hole in the side of the exhaust pipe, (away from any welds and NOT into the catalyst), and use one of the brass cone adaptors o obtain a reading. After testing the small hole will require filling with either a small self tapping screw or weld.

VACUUM TEST

1. Use the supplied adaptors to connect gauge as close to the inlet manifold as possible, ensure that the hose is not kinked. Should an engine have two inlet manifolds carry out separate tests on each manifold.
2. Start engine, if required adjust idle speed to obtain a smooth tick over. If the gauge needle remains steady with a reading between 43 and 55cmHg, the engine is in good condition.
3. If the gauge drops back about 10cmHg on the dial, this would indicate sticky valves. Disconnect the vacuum hose and spray penetration oil into the manifold to lubricate the valves.
4. If the needle consistently drops, this would indicate that the valve clearances are too tight or that a valve has burnt out.
5. If the needle pulsates rapidly when the rpm is increased, this indicates that valve springs may be weak.
6. If the needle pulsates rapidly at idle, and steadies out when the rpm is increased, this indicates that the valve guides are worn or loose.
7. If the needle is slow to drop back after engine rpm has been increased several times in sucession, this would indicate that the exhaust system may be partially blocked.
8. If the gauge indicates less than 25cmHg, this would indicate that the valve timing is late.
9. To check the choke, close the throttle and turn the engine over using the starter motor, the gauge should rise quickly to 55cmHg. If the gauge remains at a low reading or 7 to 15cmHg then the throttle may not be fully closed or there may be an air leak in the inlet manifold. NOTE: Gauge readings will vary with altitude, at sea level the vacuum gauge will drop by 2.5cmHg. For instance at 2000ft the reading will be 44cmHg.

ENVIRONMENT PROTECTION
Recycle unwanted materials instead of disposing of them as waste. All tools, accessories and packaging should be sorted, taken to a recycling centre and disposed of in a manner which is compatible with the environment. When the product becomes completely unserviceable and requires disposal, drain any fluids (if applicable) into approved containers and dispose of the product and fluids according to local regulations. Note: It is our policy to continually improve products and as such we reserve the right to alter data, specifications and component parts without prior notice. Important: No Liability is accepted for incorrect use of this product.

Warranty

Guarantee is 12 months from purchase date, proof of which is required for any claim.

Sealey Group, Kempson Way, Suffolk Business Park, Bury St Edmunds, Suffolk. IP32 7AR
01284 757500 sales@sealey.co.uk www.sealey.co.uk
© Jack Sealey Limited
Original Language Version
VSE953 Issue 2 (ALL) 16/10/23

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