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INSTRUCTIONS FOR:
DIESEL ENGINE COMPRESSION TEST KIT MASTER
MODEL No: VS2044
Thank you for purchasing a Sealey product. Manufactured to a high standard, this product will, if used according to these
instructions and maintained properly, 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.
Refer to Instruction
Manual
Wear Eye
Protection
1. SAFETY
WARNING! Ensure all Health and Safety, local authority, and general workshop practice regulations are
strictly adhered to when using product.
Compression tests on diesel engines should be conducted when the engine is cold.
Maintain tools in good and clean condition for best and safest performance.DO NOT use test kit if damaged.
Wear approved eye protection. A full range of personal safety equipment is available from your Sealey dealer.
Wear suitable clothing to avoid snagging. Do not wear jewellery and tie back long hair.
Use proper ventilation and avoid breathing in exhaust fumes.
Keep a fire extinguisher to hand.
Fuel delivery must be prevented by either operating the engine stop lever or disconnecting fuel pump solenoid.
Ensure you keep tester at arms length when relieving pressure to avoid personal injury.
Protect your hands from burns as quick release coupling and adaptors may become hot during use.
Account for all tools and parts being used and do not leave them in, on or near the engine after use.
DO NOT remove the compression test equipment while engine is being cranked.
IMPORTANT: Always refer to the vehicle manufacturer’s service instructions, or proprietary manual to establish
the current procedure and data. These instructions for use are provided as a guide only .
© Jack Sealey Limited
Original Language Version
VS2044 Issue: 2(I) - 24/02/17
Page 2
2. INTRODUCTION
The extensive range of glow plug and injector adaptors enable this kit to cover the vast majority of car, van, truck, bus, agricultural and marine
diesel engines. Supplied in carry-case with preformed liner and foam filled lid.
3. CONTENTS
LID
BASE
Test Kit Contents.
VS2042/01 Gauge & Hose
Assy
c/w 90° Coupler Elbow
Dummy Glow Plug Adaptor
VS2043/1 GP Adaptor
VS2043/2 GP Adaptor
VS2043/3 GP Adaptor
VS2043/20 GP Adaptor
VS2043/21 GP Adaptor
VS2043/22 GP Adaptor
VS2043/23 GP Adaptor
VS2043/24 GP Adaptor
VS2043/25 GP Adaptor
VS2043/26 GP Adaptor
VS2043/27 GP Adaptor
VS2043/40 GP Adaptor
VS2043/41 GP Adaptor
VS2043/42 GP Adaptor
Test Kit Contents.
Dummy Glow Plug Adaptor
(continued)
VS2043/43 GP Adaptor
VS2043/44 GP Adaptor
VS2043/45 GP Adaptor
VS2043/46 GP Adaptor
VS2043/47 GP Adaptor
VS2043/60 GP Adaptor
Dummy Injector Adaptors
VS2044/1 Injector Adaptor (IN1)
VS2044/2 Injector Adaptor (IN2)
VS2044/3 Injector Adaptor (IN3)
VS2044/4 Injector Adaptor (IN4)
VS2044/5 Injector Adaptor (IN5)
VS2044/60 Valve & Seal Set
VS20456 Clamp-on Injector
Adaptor Set
VS2042/02 Case + Inserts
© Jack Sealey Limited
Original Language Version
VS2044 Issue: 2(I) - 24/02/17
Page 3
4. OPERATION
Diesel Engine Compression Test Kits
VS2042/01 Compression Tester is at the centre of the Sealey Diesel Engine Compression Test range. It comprises a quality dual scale
pressure gauge (0-70 bar/0-1000psi), Re-test valve (pressure relief valve), hose assembly with straight connecting coupler and a swivel
90° coupler elbow providing an alternative connection onto the adaptors.
The Adaptor Range comprises Dummy Glowplug and Dummy Injector Adaptors.
All adaptors connect to the Tester via a quick coupler system.
Diesel Engine Compression Testing - General
WARNING: When carrying out a cranking test, engine fuel delivery must be prevented by either operating the engine stop lever
or disconnecting the fuel pump solenoid.
The engine MUST NOT be allowed to 'fire' or damage could result to the tester, particularly the non-return valves.
The VS2042/01 Compression Tester is connected to the adaptor via the quick coupler on the hose assembly. Alternatively, when space
is restricted, the 90° swivel coupler elbow can be fitted into the quick coupler to improve access.
Crank Test: Crank the engine whilst observing the gauge. The indicator needle will rise in increasing steps until a maximum reading is
reached, then stop cranking. Note down the gauge reading. Depress the Re-test valve to relieve pressure.
WARNING: Hold gauge away from you, at arms length, owing to
high pressure release.
Remove the tester and adaptor, install on the next cylinder, and
repeat test until all cylinders have been assessed. Compare data
obtained comparatively and to that published by the
vehicle/engine manufacturer.
Compression tests on diesel engines should be conducted
when the engine is COLD.
Always ensure that the battery is fully charged when carrying
out a crank test as this could influence the results.
Remove the glowplug or injector from the cylinder to be tested
and replace with the appropriate adaptor.
Performance Guide:
Compression should build up quickly in a healthy. A low
compression on the first stroke, followed by gradually-increasing
pressure on successive strokes, indicates worn piston rings.
A low compression reading on the first stroke, which does not
build up during successive strokes, indicates leaking valves or a
faulty head gasket (a cracked head could also be the cause).
Deposits on the underside of the valve heads can also cause
low compression.
If the pressure in any cylinder is considerably lower than the
others, introduce a small quantity of clean oil into that cylinder `
and repeat the test.
If the addition of oil temporarily improves the compression
pressure, this indicates that bore or piston wear is responsible
for the pressure loss. No improvement suggests that the
leakage is past the valves, or a faulty head gasket may be to
blame.
A low reading from two adjacent cylinders suggests a faulty head
gasket between the two cylinders. The presence of coolant in the
engine oil will confirm this.
If the compression is unusually high, the combustion chambers
are probably coated with carbon deposits. If this is the case, the
cylinder head should be removed and decarbonised.
a recycling centre and disposed of in a manner which is compatible with the environment. When the product becomes completely
unserviceable and requires disposal, dispose of it according to local regulations.
NOTE: It is our policy to improve products continually 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 will be required for any claim.
© Jack Sealey Limited
Recycle unwanted materials instead of disposing of them as waste. All tools, accessories and packaging should be sorted, taken to
Sole UK Distributor, Sealey Group,
Kempson Way, Suffolk Business Park,
Bury St. Edmunds, Suffolk,
IP32 7AR
Environmental Protection
Original Language Version
01284 757500
01284 703534
www.sealey.co.uk
sales@sealey.co.uk
VS2044 Issue: 2(I) - 24/02/17
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