engine tune up procedure
TRANSCRIPT
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Engine Tune-UpProcedure(121-125)
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INTRODUCTION :
WHAT DO YOU MEAN BY ENGINE TUNE-UP?- The tune-up is a routine maintenance operation which is
essential for the efficient & economical operation , as well as for long life of yours cars engine.
- INTERVAL BETWEEN ENGINE TUNE-UP.- The interval between engine tune up should be after
completion of 30,000miles (48,309km).
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• NECESSARY TOOLS:
1). Service manual
2). Feeler gauge
3) Safety glasses & goggles
4). Spark plug socket & ratchet
5). Spark plug gauge
6). Oil , Oil filter & Oil pan
7). Screwdrivers
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TYPICAL TUNE UP
1.Loose spark plug, start engine shut of engine & remove spark pug.
2.Test engine compression.
3..Check the compression ratio.
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4.Check battery cables for damage ,corrosion & loose connection .
5.Check intake manifold bolts for tightness to proper specification.Even a slight leak will reduce engine performance.
6.Check & adjust acclerator linkages.
7.Check intake manifold and air inject system.
8.Check steering system for looseness and ease of action.
9.Ceck suspension system and shock absorber for
excessive play &wear
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PROBLEMS WHICH ARE TO BE CHECK IN “ENGINE TUNING” UP PROCESS
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*.CRANK SHAFT THUMPING
Metallic, heavy & dull knocks which increase in frequency.
Causeses-1.Excessive main bearing clearance.2.Excessive crankshaft axial play.3.Crankshaft out of balance.4.Low oil pressure.5.Loose fly wheel.
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*.CONNECTING ROD NOISE.
1.Excessive big end bearing clearance.
2.Insufficient lubrication. 3.Low oil pressure. 4.Misaligned connecting rod. 5.Ovalized crank pin.
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*PISTON NOISE.
Oscillation of piston in barrel. More evident at low r.p.m. “ Noise may be single out by
pouring SAE 50.”*IF NOISE IS PERSISTING THEN
REPLACE THE PISTON.
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*PISTON PIN NOISE.
Excessive clearance between pin and piston bore.
Excessive clearance between pin and bush.
Bush loose in connecting rod small end.
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*VALVE & TAPPET NOISE. Excessive tappet clearance. Broken valve spring . Excessive wear of one or more cams
on camshaft .
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*ENGINE VIBRATIONS.
Defective ignition. Defective lubrication. Crankshaft out of balance. Clutch out of balance. Conn-rods & piston are out of weight. Too stiff engine support.
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1. Fuel Filter 2. Spark plugs 3. Car manual 4. Air Filter 5. Distributor Cap 6. Spark plug Gapping tool
Engine Tune up Checklist
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1.Air Filter
4.Distributor Cap3.Fluids
2.Fuel Filter
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Air Filter Specifications
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Deposits Insulator Breakage Melting Carbon deposites
Spark Plug Defects :
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Grayish or brown= properly burning. Black or wet= not firing or engine
problem.
The correct colours for the tip and insulator
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Most new engines do not require spark plug replacement for up to (100,000 miles)
Spark plug replacement
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Types of Spark plugs
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Wear eye protection. Set parking break . Place vent hose on exhaust pipe. Disconnect battery.
Tune-up safety rules to follow :
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Tuning Up a Jeep Engine(Sequence)
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Electrolyte level Specific Gravity Battery terminals and cable
connectors Tightness of terminal screws Tightness of negative ground cable
connection Replacing with new one.
Clean and Check Battery
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Thank
You