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