2-18Section 3 Daily Maintenance of MK SedanDaily maintenance means operation of vehicle regular inspection, cleaning, fastening, and refilling according to
vehicle usage and condition on the basis of regular maintenance to make sure the vehicle is at good status. Daily
maintenance can be performed by driver or professional automotive mechanics in daily use of vehicle. But some
of the items must be conducted by professional mechanics at service shops.
1. Maintenance of air cleaner
Air cleaner filters the air that is coming into engine for the first time. Dust and other dirt filtered out gathers in the
induction tube. Air cleaner filters a lot of dust and dirty, so it must be cleaned in time.
2. Maintenance of air filter
Air filter does not only filter the dust and dirt in the air, but also keeps smooth ventilation. Its status has great effects
on the fuel economy and power of the engine, so it must be checked and maintained in time.
Before it is time to replace air filter, maintain it. Remove the filter, knock it with hand or stick to get rid of dust
on the filter and remove dirt inside the filter cover according to the cleanness of the road that the vehicle usually
runs on.
ATTENTION: do not clean the filter with wet cloth. Fasten the filter well when installing it back.
3. Maintenance of battery
Battery is used to start the vehicle and supply power to electrical facilities. Its status directly affects the regular
usage of the vehicle, especially for vehicles equipped with electrical controlled facilities. Keeping the battery in
good technical status and connections is especially important. It is necessary to often perform the following
inspections and maintenance in regular usage:
(1) Clean the outside of battery Inspect if the battery case or cover surface is dirty or has dirt, oil, or other dirty
things regularly. Clean it and keep the surface dry to avoid electrical leak caused by cover deformation.
(2) Check battery connections Bad connection between battery electrode and cable results in low engine start
speed which makes it difficult to start the vehicle or the vehicle cannot be started because of low output voltage
from battery. Loose connection at battery end leads to damage of electrical components and loss of trouble code
and other information stored in RAM of the computer system as a result of low voltage. Therefore, it is necessary
to check if the connection of cables on the battery electrode is good. When it is found loose, it must be fastened.
If there is any rust, the cables must be loosened, washed clean and be connected again.
4. Maintenance of tires and wheels
(1) Keeping tires and wheels under good condition is very important to vehicle fuel consumption and driving
safety. Therefore, inspect and maintain the tires regularly. Every 10000 km, the wheels should be adjusted. Follow
the sequence in picture 3:
Judge if there is any hidden problems in vehicle chassis mechanism by observing wear in different places, andfinding out the hidden problems does not only help you to understand
the technical status of the vehicle, but also benefits driving safety.
a. Serious wear on both edges of tire tread, means tires often
work with low tire pressure.
b. Wear of middle of the tire tread is mainly because the tires
are used with high tire pressure.This kind of wear shortens
the useful life of tires, and may result in sudden flat tire
when the vehicle runs on uneven road surface or meets any
obstacles.Usage and Maintenance of MK Series - Daily Maintenance of MK Sedan
2-19 (4) Tire wear limits When the wear limit mark on tire shows up as the tire wears, it must be replaced with new tires (wear limit mark
indicates the thickness of tire pattern is 1.6mm).
5. Maintenance of wiper and washer
Status of wiper and washer directly influences windshield and driver's view. So, pay attention to wipers and
washers.
(1) Wiper Check if the wiper blade has any damage, deformation, which affects windshield wiping quality
and if the wiper works well. If wiper blade does not wipe well or the wiper does not work well, fix or replace it
in time.
(2) Washer Check washing fluid level in the tank, and refill when necessary. To get best washing effects, use
specified washing fluid, refill slowly, and pay attention not to mix it with any dirt. Mix the washing fluid with some
alcohol in winter to avoid freezing.
6. inspect and adjust headlampIncorrect beam of the headlamps affects safety of driving in the dark. So they must be inspected regularly, and be
adjusted when necessary.
7. Maintenance of inside the vehicle
The major content of maintenance inside the vehicle is cleaning, to keep the vehicle clean and provide fresh and
pleasant driving circumstance. The key points of indoor cleaning are:
(1) Ways to remove stains Get rid of dust before trying to remove stains, and then apply appropriate cleansing,and wipe the stains off with clean, soft, and not too wet cloth repeatedly.
(2) Cleansing It is better to remove stains on textile and man-made leather with hydro solvent made from soap
fluid and surface active agent. Be careful to avoid using any cleansing because they may corrode the synthetic
decoration materials more or less. Ball-pen and lipstick marks can be removed with alcohol, grease can be removed
with low Ron value gasoline, and chocolate and sugar stains can be cleaned with ammonia spirit, asphalt must be
cleaned with special cleansing.Tire Specification Tire Pressure (KPa)
Front Tire 185/60R15 84H or 175/65R14 82H 230
Rear Tire 185/60R15 84H or 175/65R14 82H 210c. Wavy wear on the tread is related to its quality and positioning of the wheels. Find out the root cause
and eliminate any problems.
d. Serious wear on the outer side beside the tread of steering wheels means the wheel outward leaning angle
is too big; wear on the inner side beside the tread means the leaning angle is too small.
e. When the toe-in value is getting smaller, the wear on the outer side of tread is in shape of saws. On the
contrary, when the inner side has the saw shape wear means the toe-in value is too big.
(2) Maintenance
a. Keep the tire pressure to specified value under any circumstances. Measure the pressure on cold tire
b. Check tire pressure regularly, and remove any indented objects that may stick through the tires.
c. Avoid oil, gasoline, and brake fluid on tires.
d. When replaced with new tires, the wheels need to be balanced and adjusted again. Or the vehicle may
shake when running at high speed and bear abnormal wear.
e. Do not mix tires of different structure, pattern, or brand on one vehicle.
(3) Tire specification and pressureUsage and Maintenance of MK Series - Daily Maintenance of MK Sedan
2-20 (3) Long time exposure to sun damages interior. So it is better to use covers on upper seat backs, and rear
separation board that are exposed to sun.
8. Maintenance of body exterior
Body exterior is to keep body cleanness and brightness to give the impression of beauty and comfort, and to avoid
rust and abnormal paint peeling off. The key points of body maintenances are:
(1) Wash body using the method below:
a. Wash the dirty things off the body by pressurized water, and then clean the body with
soft cloth of sponge from up to down.
b. Dry body surface with good white cloth. Apply brake pedal several times when driving
after the car is washed to get rid of water in braking system.
c. Do not wipe the body when it is dry. Do not clean paint surface and glass with gasoline,
coal oil, narkosid, strong lye or alcohol.
(2) Cleaning windshield glass
Do not use silicon-bronze radical products. To get better cleaning effects, use special glass cleanser.
(3) Cleaning asphalt on the body
Do not peel the asphalt off from body or bumper, but use special cleanser
(4) Paint
Scratches or slight damages can be fixed with special paint spray. It dries in the air.
(5) Cleaning exterior decoration parts and aluminum parts. Wash with water with soap fluid or cleanser, and wash with clean water. To keep the gloss of painted surface,
wax on the surface after it is dry. (6) Polish and wax the body paint polishing and waxing keeps the body bright and pretty, and protects the paint
as well.
a. Polish in winter. Make sure the vehicle body is absolutely clean and dry before
polishing, polish with fluid or milky wax.
b. Vehicle body must be absolutely dry and clean before waxing. Use waxing tools (soft
table tissue or smooth cotton cloth) to cover the body paint surface evenly with wax.
Check if the vehicle body is covered by wax: spray some water onto the paint surface,
if water drops are formed, that surface is waxed, otherwise, clean the surface and wax
it again. Attention: do not wax under sun, or in cold weather.
Attention
1) When using high pressure washing machine, do not point the washing sprayer to transmission, steering
mechanism and other rubber protection parts, or exterior decoration parts, roof welding lines, heat radiator
or engine compartment.
2) The bottom of vehicle body is made of anti-corrosion material,and has been through anti-corrosion process.
After the vehicle has been running frequently on roads de-frozen with salt for some time, clean engine
compartment and lower part of vehicle body and take some protection actions.Usage and Maintenance of MK Series - Daily Maintenance of MK Sedan
Part III EngineChpater 1 Engine AssemblyInformation about engine accessories in MK-1 Car Maintenance Manual deals with only that concerned with a
complete car. Please refer to separated Maintenance Manual for information about the engine body. Engines
concerned are MR479Q, MR479QA and MR481QA.Section 1 Engine Inspection1. Check the engine oil
(1) Check the oil level.
(2) Start the engine, and reach warm-up temperature.
(3) Shut the engine down, wait for 3-5min, and check the oil level.
(4) Check whether the oil level is in within the range marked by the scale; if it is lower than the limit (mark
L), fill oil to mark F.
(5) Keep the oil clean without any coolant or petrol mixed in and with appropriate viscosity.
2. Change oil.
(1) Start the engine. When normal temperature is reached, shut down the engine.
(2) Open the oil cap, remove the oil drain plug, and drain the oil.
(3) Tighten the oil drain plug to a specified torque 54N.m.
(4) Fill fresh oil into the crank case with oil quantity 2.8L in case of the filter not changed, 3.0L in case of the
filter changed and 3.5L in case of the dry filter.
(5) Fit on the oil filling cap.
(6) Start the engine.
(7) Shut down the engine and check the oil quantity, and fill oil to the mark F on the oil scale if necessary.
3. Replace the oil filter.
(1) Remove the oil filter.
(2) Before mounting the oil filter, apply a small quantity of engine oil to the O-ring of the new oil filter.
(3) Tight the oil filter to a specified torque (12.7N.m).
(4) Start the engine, and check whether there is any leakage
(5) Shut down the engine, check the oil quantity and fill as required.
4. Oil selection
Oil over PAI SG grade is preferred.
SAE10W-30 or SAE10W-40 is preferred, and ASE5W-30 is used in cold region in the winter.
Note: For the best effect and the greatest safety, it is advisable to use the following lubrication oil.
a. Meet the requirements of API level.
b. Select proper SAE viscosity rating within expected ambient temperature.
The lubrication oil that can not meet the requirements of SAE viscosity and API label at the same time is not
allowed.
5. Check the coolant.
(1) After the engine is cooled down, remove the radiator cover.EngineEngine Assembly3-1 -
12. Check the compressing pressure (see Figure 1-4).
(1) Warm up and switch off the engine.
(2) Remove the secondary wire.
(3) Remove the spark plug.
(4) Check the compressing pressure in the cylinder.
a.Insert the pressure gauge into the spark plug bore.
b. Throttle widely opens.
c. Rotate the engine crankshaft and measure the compressing
pressure (see Table 2).Figure 1-4Table 2Cylinder compressing pressure (KPa)Pressure difference range of cylinders of this model (KPa)Minimum compressing pressure (KPa)MR479Q MR479QA MR481QA
1250 1320 1360
100
980
Attention:
The electric quantity in the battery should be always enough, and the engine speed should be not less than
250r/min.
Check the compressing pressure in other cylinders in the same way.
Measure as soon as possible.
(5) If the compressing pressure in more than one cylinder is relatively low, fill a bit engine oil to the cylinder
through the spark plug bore, and repeat step a to c to check.
Tip:
If the compressing pressure is increased after the oil is filled, the piston ring or the cylinder may be worn or
damaged.
If the pressure is still low, the valve may be jammed or badly sealed, or the washer may be leaked.
13. Check CO/HC.
(1) Start the engine.
(2) Keep the engine running at a speed of 2500 r/min for about 180s.
(3) During idling, insert the test bar of CO/HC instrument into the exhaust pipe about 40cm depth at least.
(4) Check the concentration of emission of CO/HC at idle speed and at a speed of 2500 r/min respectively.
Tip:
Measure within 3 minutes.
Test the concentration of emission and lambda value of CO/HC at idle speed and at a speed of 2500 r/min
respectively according to GB18352.3-2005 standard.
(5) If the concentration of CO/HC is not up to standard, carry out fault diagnosis by following the steps below.
(1) Check oxygen sensor.
(2) Refer to Table 3 to find possible causes, check and repair.Engine AssemblyEngine Inspection3-4 -
Chapter 3 Fuel SystemSection 1 Check Fuel System PressureOn-board inspection
1. Check the operation of the fuel pump.
(1) Connect the positive and the negative of the battery to
appropriate connector sockets of the fuel pump (see Figure 3-1).
Attention: Do not start the engine.
If there is pressure present, you will hear that the fuel is flowing.
If there is no pressure present, check the fusible cutout, fuse, EFI
open-circuit relay, fuel pump, ECM (Electronic Control Module) and
circuit joint.
(2) Turn the ignition switch to "OFF".
2. Check the pressure of the fuel.
(1) Check whether the battery voltage is more than 12V.
(2) Disconnect the negative wiring cable from the battery.
(3) Mount a pressure gauge on the fuel input pipe
(see Figure 3-2).
(4) Connect the negative terminal of the battery.
(5) Measure the fuel pressure.
Fuel oil pressure: 265-304kPa
If the pressure is low, check the fuel pipe and connection,
fuel pump, and fuel filter. If the pressure is too high,
replace the regulator.
(6) Start the engine. Measure the fuel pressure at idle speed. The
fuel pressure is 265-304KPa. If the pressure is unsatisfactory, checkFigure 3-1
Figure 3-3 Figure 3-2Fuel SystemCheck Fuel System Pressure3-15the fuel pump, pressure regulator, and injector, and replace if necessary.
(7) After shutting down the engine, check the fuel pressure and
keep the specified pressure for about 5 minutes. The fuel pressure is:
147KPa.
3. The fuel oil pressure regulator (DR) (see Figure 3-3).
Mounting position: On the distributing pipe for fuel.
Faults: Too low or too high fuel pressure, or hard to start.
General causes: Using poor fuel for a long time results in: 1.
strainer blocked; 2. serious leakage caused by particles and impurities.
Other reasons: Man-made mechanical damage, etc.
Maintenance precautions: During maintenance: 1. Never impact the diaphragm element with high pressure
gas; 2. Never clean it with aggressively corrosive liquid; 3. No distortion caused by external force.
Easy measuring method: For the system with oil return, connect a pressure gauge for the fuel on the suction
pipe, start the engine, and run at idle speed. Now, the fuel pressure in the engine should be about 260KPa; pull out
the vacuum pipe of the fuel pressure regulator, and the pressure should be 300KPa approximately.Battery
T conector
Hose
Hose
Fuel Inlet Pipe
Fuel Pipe
Conector -
Section 2 Fuel Pump Inspection1. Fuel pump (1) Check whether the resistance of the fuel pump is 0.2~3.0 ohm¸ at 20°C. If not, replace the fuel pump (see Figure3-4).
(2) Fuel oil pump running:
Switch on the fuel pump with a battery and check. If the operation is unsatisfactory, replace the fuel pump or
wires (see Figure 3-5).
The test should be done within 10s to protect the coil from burning out.
2. Fuel injector assembly
Oil injecting quantity: 40~50cm3/s.
Tolerance of each injector: not more than 10 cm3.
If the fuel injecting quantity is not up to the specification, replace the injector.
Check leakage: Under above conditions, disconnect the wire from the battery, the fuel should not drip one per
minute.Figure 3-4 Figure 3-5BatteryOhm
meterFuel SystemFuel Pump Inspection3-16 -
Section 3 Fuel Pump ReplacementComponent ViewFigure 3-6Replace1. Operations avoiding petrol overflowing.
2. Disconnect the fuel oil hose from the oil tank.
3. Disconnect the oil return hose from the oil tank.
4. Disconnect the vapor discharge pipe from the oil tank.
5. Remove the fuel oil pump assembly with a filter (see Figure 3-7)
Loosen the oil tank cap with a tailored tool. Take care not to bend
the arm of the oil quantity sensor when taking the fuel oil pump out
6. Mount the fuel oil pump assembly (see Figure 3-8).Replace the
sealing ring. Align the boss on the oil pump with the nick on the oil
tank port; tighten the oil tank cap with special tool.
Torque: 40N.m
7. Mount the vapor discharge pipe.
(1) Mount the oil return hose;
(2) Mount the fuel oil hose;
(3) Check leakage of the fuel oil.Figure 3-7
Figure 3-8Fuel SystemFuel Pump Replacement3-17Fuel tank cap
Fuel pump with fuel sensor as-
sembly
O-ring
Fuel tank assembly Fuel return hoseFuel oil hose
snap ring -