Topic 6

Vehicle Preventive Maintenance

Objectives:

At the end end of the lessons the students are expected to:

1. Identify the preventive tools and equipment .

2. Value the importance of Vehicle Preventive Maintenance .

3. Performed to retain a machine/equipment in a satisfactory operating conditions.

Cooling system

CHECK COOLANT LEVEL If coolant level is low, fill to FULL line of reservoir tank

Check coolant

Check for evidence of oil in coolant.

Check cooling system

heck for 1. Damaged or deteriorated radiator and water hows 2. Loose hose clamps. 3. Damage or corrosion in the radiator core. 4 Leakage from the water pump, radiator core or a loose water drain cock.

INSPECT RADIATOR CAP OPERATIon

With a radiator cap tester inspect the spring tension and seating condition of the radiator cap vacuum valves. Replace the cap if the valve opens at a pressure below the specified or is otherwise directives Valve opening pressure: STD 0.75-1.05 kg/cm² (10.7-14.9 psi) Limit 0.6 kg/cm² (8.5 psi)

Drive belt

Check the drive belt for: 1. Cracks, deterioration, stretching or wear. 2. Adherence of oil or grease 3. Improper belt-to-pulley contact.

Check & adjust belt tension

Except USA & Canada With 10 kg (22 lb) of force, press on the belts at the points indicated in the figure. The belts should deflect the amount specified. Drive belt deflection at 10 kg (22 lb): Fan Alternator 7-11 mm (0.280.43 in.) Crank A/C compressor 11-14 mm (0.430.55 in.).

USA & Canada Using a time borroughts tension gauge BT-33-73F, adjust the following value. Drive belt deflection: New belt 125±25 lbs Used belt 80±20 lbs.

Air cleaner

CLEAN ELEMENT 1. Remove the air cleaner element. -Note- Use care to prevent dirt or other foreign matter from entering into the carburetor. 2. To clean the element, blow compress and air. from inside 3. if element is torn or excessively dirty, replace it with a new one Check the battery for the following BATTERY VISUAL CHECK 1. Busted battery support. 2. Loose terminal connections 3.Rusted or deteriorated terminate. 4. Damaged or leaking battery.

Battery

VisuaL CHECK Check the battery for the following: 1. Rusted battery support 2. Loose terminal connections 3. Rust t or deteriorated terminals. 4. Damaged or leaking battery,

Measure specific gravity

1. Check the specific gravity of electrolyte with a hydrometer, Specific gravity: 1.25-1.27 at 20°C (68 F) 2. Check the electrolyte quantity of each cell If not at the proper level, fill with distilled water

Engine oil

CHECK OIL LEVEL The oil level should be between the Land F marks. If low, check for leakage and add oil up to the F mark. Use API service SE classification oil.

CHECK OIL QUALITY Check the oil for deterioration, entry of water, discoloring or thinning.

REPLACE OIL FILTER 1. Remove the oil filter with SST SST 100228-220201. 2 To install, hand-tighten the oil filter firmly. 3. After starting the engine, check for oil leaks and recheck the oil level.

Spark plug

VISUAL CHECK Check the spark plugs for the following: 1. Cracks or other damage on the threads and imulator 2. Electrode wear 3. Damaged or deteriorated gaskets 4. Burnt electrode or exces carbon deposits

Clean spark plug

1. Do not use the spark plug cleaner longer than necessary 2. Thoroughly blow off the cleaning compound and carbon with compressed air. 3. Clean the threads and outer imulator surface.

ADJUST GAP Chock each plug gap with a spark plug gap gauge necessary, adjust by bending the protruding (outer) electrode.

HIGH TENSION CORD CHECK RESISTANCE

-Note- When pulling out the cord from the spark plug, always grip the end of the cord.

Distributor

CHECK DISTRIBUTOR CAP 1. Cracks, damage, corrosion, bumping and dirty cord hole 2. Burnt electrode terminal 3. Weak center piece spring action.

CHECK & ADJUST POINT GAP OR AIR GAP 1. if the points are excessively burnt or pitted, replace the breaker points 2. Adjust point gap and damping spring. Rubbing block gap: 0.45 mm (0.0177 in.) 3. Adjust the air gap between the rotor and pick up coil projection Air gap: 0.2-0.4 mm (0.008-0.016 in.) CHECK DWELL ANGLE Fig. 2-23 DWELL ANGLE Dwell angle: 526 Check the dwell angle with a dwell angle tester.

INSPECT IGNITION TIMING Set the engine revolution at idle speed The octane selector must be set at standard position. Ignition timing: 8 BTDC/idling

Adjust ignition timing

Align the timing marks try turning distributor body. Ignition timing: 8 BTDC/idling Caution Do not adjust by the octane selector.

Check Governor operation

1 Rotor should return quickly when turned clockwise by hand and released 2. Rotor should not be excessively loose

3. Start the engine and disconnect the vacuum hase from the distributor. The timing mark should vary in accordance with the engine speed.

Check vacuum advance operation

Connect the distributor vacuum hose The octane selector should vary in accordance with the opening and closing of the throttle valve.

Valve clearance

ADJUSTMENT 1. Warm up engine and tum it off 2. Set No. 1 cylinder to TOC/compression 2-11 3. Retighten the head bolts and rocker support bolts Tightening torque: 1.8-2.4 kg-m (14-17 ft-lb) Fig. 2-31 4. Adjust valve chisarance Valve clearance is measured between salve stem and rocker arm, Adjust the valves indicated by arrows only Valve clearance: IN EX 0.20 mm (0.0079 in.) 0.30 mm (0.0118 in.) 6 Rotate the crankshaft 360 6. Adjust remaining valves indicated by arrows -Note Use the SST oil tray when the adjustment is performed with engine running. SST [09229-22010)