Sealey VSE3157 User manual

DIESEL COMPRESSION GAUGE, HOSE & TDC
BASE KIT
MODEL NO: VSE3157
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.
1. SAFETY
WARNING! Ensure Health and Safety, local authority and general
workshop practice regulations are adhered to when using tools.
8DO NOT use tools if seals or threads are damaged. Any defective
seal MUST be changed before use to avoid incorrect readings.
9Maintain tools in good and clean condition for best and safest
performance.
9Ensure that a vehicle which has been jacked up is adequately
supported with axle stands.
9Wear approved eye protection. A full range of personal safety
equipment is available from your Sealey dealer.
9Wear suitable clothing to avoid snagging. DO NOT wear jewellery
and tie back long hair.
9Ensure any disconnected fuel pipes are plugged to avoid spillage.
9Ensure that the correct connector is used for the engine being
tested.
9Compression tests on diesel engines should be conducted when
the engine is cold.
9 Keepareextinguishertohand.
9Use proper ventilation and avoid breathing in exhaust fumes.
9Ensure you keep tester at arms length when relieving pressure to
avoid personal injury.
9Fuel delivery must be prevented by either operating the engine
stop lever or disconnecting fuel pump solenoid.
9Protect hands from burns, as quick release coupling and
adaptors may become very hot during use.
9Always release the pressure from the gauge before disconnecting
the quick release coupling.
9Account for all tools and parts being used, DO NOT leave them in
or near the engine. Return all parts to the case and store this in a
safe, dry, childproof location.
IMPORTANT: Always refer to the vehicle manufacturer’s service
instructions, or a proprietary manual, to establish the current
procedure and data. These instructions are provided as a guide only.
2. INTRODUCTION
Diesel engine glow plug compression test adaptor kits that cover a wide range of modern vehicles. For use in conjunction with Sealey Diesel
Compression Gauge, Hose & TDC Base Kit (Model No. VSE3157). See Sealey website for complete vehicle applications.
3. SPECIFICATION
Model No: ............................................................... VSE3157
Nett Weight: ................................................................1.82Kg
Associated Tools: .................. VSE3151, VSE3152, VSE3153
Pressure Release Valve
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VSE3157 Issue 2 18/02/19
Original Language Version
© Jack Sealey Limited
Refer to
instructions
Wear eye
protection
Wear protective
gloves

4. OPERATION
4.1. OVERVIEW OF COMPRESSION TESTING.
 Whenanengine’sperformanceisdown,orifmisringoccurswhichcannotbeattributedtotheignitionorfuelsystems,a 
compression test can provide diagnostic clues as to the engine’s condition.
 Compressionshouldbuildupquicklyinahealthyengine.Averylowcompressionreadingontherststroke,followedbygradually
 increasingpressureonsuccessivestrokes,indicateswornpistonrings.Alowcompressionreadingontherst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 undersides 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 through the glow plug hole, 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. If there is no improvement, it suggests that the leakage is around the valves, or a faulty head gasket.
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conrm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 de-carbonised.
As a rough guide, engines having a compression pressure in excess of 100psi (6.9 bar), should not exceed a compression loss of
more than 10psi (0.69 bar). On older engines with lower compression pressure, loss should not exceed 0.35 bar (5psi).
4.2. COMPRESSION TESTING.
4.2.1. Check the engine oil is at the correct level.
4.2.2. Remove all of the glow plugs from the engine.
4.2.3. Selecttheapplicableadaptorfromoneoftheaccompanyingkitsandscrewitintotherstglowplugport,ensuringthereisagood
 sealwiththeO-ring(iftted).Connectthecouplingonthepressuregaugehosetotheadaptor,ensuringitlocksintoplace.
4.2.4. Turn over the engine using the starter motor and observe the gauge, looking for a steady increase in the reading (see 4.1) and note
the maximum reading obtained. Refer to the vehicle/engine manufacturer’s workshop manual for compression results data.
4.2.5. Depress the Re-set Valve (situated under the gauge) to release the pressure. The Re-set Valve allows the test to be repeated if
required without disconnecting the tester from the glow plug port.
WARNING! Always release pressure via the Re-set Valve BEFORE disconnecting the Tester.
4.2.6. Disconnect the compression tester from the adaptor and remove the adaptor from the glow plug port. Install them into the next
cylinder’s glow plug port and repeat the tests. Continue the tests for all of the remaining cylinders in turn.
NOTE: A variation in compression readings between cylinders is often a better indication of engine problems than the individual values of
compression.
4.3. TDC Indicator Tool.
4.3.1. Remove the glow plug from cylinder number 1. It may also be necessary to remove all glow plugs to facilitate manual turning over
of the engine.
4.3.2. Select the applicable adaptor from one of the accompanying kits and screw it into the glow plug port of cylinder number 1. Ensure
 thatthereisagoodsealwiththeO-ring(iftted).ConnectthecouplingontheTDCndertotheadaptor,ensuringitlocksinto 
place.
4.3.3. Position the indicator in a vertical position, in a suitable viewable location, using the magnetic hook if needed.
4.3.4. Turn the engine over manually, using a spanner or socket on the crankshaft pulley, in the direction of engine rotation and watch for
 theoattoriseinthetube.Asthepistonrisesonthecompressionstroke,theoatwillrisetothetopofthetubeandstaythere, 
 whenthepistongoespastTDCandcompressionislost,theoatwillsuddenlysink.Notepositionandtemporarilymake 
suitable marks to indicate TDC, or compare with existing timing marks.
4.3.5. Turntheengineoverafurther1¾turnsandtheoatshouldstarttoriseagainasthepistonrisesonthecompressionstroke. 
 ContinuetoslowlyturnthecrankshafttowardsTDC(watchingthetimingmarks)-notetheexactpointwhentheoatdrops.Alter
the timing mark if required.
4.3.6. Repeat the procedure, turning the engine over a further 2 turns to re-check for accuracy.
4.3.7. Disconnect the TDC tool from the adaptor and remove the adaptor from the glow plug port.
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VSE3157 Issue 2 18/02/19
Original Language Version
© Jack Sealey Limited

Sealey Group, Kempson Way, Suffolk Business Park, Bury St Edmunds, Suffolk. IP32 7AR
01284 757500 01284 703534 [e-mail] www.sealey.co.uk
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.
VSE3157 Issue 2 18/02/19
Original Language Version
© Jack Sealey Limited