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Engine Tune-UpProcedure(121-125)
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).
• 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
TYPICAL TUNE UP
1.Loose spark plug, start engine shut of engine & remove spark pug.2.Test engine compression.3..Check the compression ratio.
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
PROBLEMS WHICH ARE TO BE CHECK IN “ENGINE TUNING” UP PROCESS
*.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.
*.CONNECTING ROD NOISE.
1.Excessive big end bearing clearance.
2.Insufficient lubrication. 3.Low oil pressure. 4.Misaligned connecting rod. 5.Ovalized crank pin.
*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.
*PISTON PIN NOISE.
Excessive clearance between pin and piston bore.
Excessive clearance between pin and bush.
Bush loose in connecting rod small end.
*VALVE & TAPPET NOISE. Excessive tappet clearance. Broken valve spring . Excessive wear of one or more cams
on camshaft .
*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.
1. Fuel Filter 2. Spark plugs 3. Car manual 4. Air Filter 5. Distributor Cap 6. Spark plug Gapping tool
Engine Tune up Checklist
1.Air Filter
4.Distributor Cap3.Fluids
2.Fuel Filter
Air Filter Specifications
Deposits Insulator Breakage Melting Carbon deposites
Spark Plug Defects :
Grayish or brown= properly burning. Black or wet= not firing or engine
problem.
The correct colours for the tip and insulator
Most new engines do not require spark plug replacement for up to (100,000 miles)
Spark plug replacement
Types of Spark plugs
Wear eye protection. Set parking break . Place vent hose on exhaust pipe. Disconnect battery.
Tune-up safety rules to follow :
Tuning Up a Jeep Engine(Sequence)
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
Thank
You
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