Page 1379 of 1897
EM0ZC-02
EM3336
NO!
P20042A02309
P12604
- ENGINE MECHANICALTIMING BELT
EM-19
1003 Author: Date:
2001 AVALON (RM808U)
INSPECTION
1. INSPECT TIMING BELT
NOTICE:
Do not bend, twist or turn the timing belt inside out.
Do not allow the timing belt to come into contact with
oil, water or steam.
Do not utilize timing belt tension when installing or re-
moving the mount bolt of the camshaft timing pulley.
If there are any defects, as shown in the illustrations, check
these points:
(a) Premature parting
Check for proper installation.
Check the timing cover gasket for damage and
proper installation.
(b) If the belt teeth are cracked or damaged, check to see if
either camshaft is locked.
(c) If there is noticeable wear or cracks on the belt face,
check to see if there are nicks on the side of the idler
pulley lock and water pump.
(d) If there is wear or damage on only one side of the belt,
check the belt guide and the alignment of each pulley.
(e) If there is noticeable wear on the belt teeth, check timing
cover for damage and check gasket has been installed
correctly and for foreign material on the pulley teeth.
If necessary, replace the timing belt.
2. INSPECT IDLER PULLEYS
(a) Visually check the seal portion of the idler pulley for oil
leakage.
If leakage is found, replace the idler pulley.
(b) Check that the idler pulley turns smoothly.
If necessary, replace the idler pulley.
Page 1380 of 1897
P18782
P18764
P18770
Protrusion EM-20
- ENGINE MECHANICALTIMING BELT
1004 Author: Date:
2001 AVALON (RM808U)
3. INSPECT TIMING BELT TENSIONER
(a) Visually check the seal portion of the tensioner for oil leak-
age.
HINT:
If there is only the faintest trace of oil on the seal on the push
rod side, the tensioner is all right.
If leakage is found, replace the tensioner.
(b) Hold the tensioner with both hands and push the push rod
strongly as shown to check that it doesn't move.
If the push rod moves, replace the tensioner.
NOTICE:
Never hold the tensioner push rod facing downward.
(c) Measure the protrusion of the push rod from the housing
end.
Protrusion: 10.0 - 10.8 mm (0.394 - 0.425 in.)
If the protrusion is not as specified, replace the tensioner.
Page 1384 of 1897
P18808
A05052
P12983
Length = 1,410 mm (55.51 in.)
P18815
EM-24
- ENGINE MECHANICALTIMING BELT
1008 Author: Date:
2001 AVALON (RM808U)
10. CHECK VALVE TIMING
(a) Slowly turn the crankshaft 2 revolutions, and align the tim-
ing marks of the crankshaft timing pulley and oil pump
body.
NOTICE:
Always turn the crankshaft clockwise.
(b) Check that the timing marks of the RH and LH timing pul-
leys with the timing marks of the No.3 timing belt cover as
shown in the illustration.
If the marks do not align, remove the timing belt and reinstall it.
(c) Remove the crankshaft pulley bolt.
11. INSTALL RH ENGINE MOUNTING BRACKET
Torque: 28 N´m (290 kgf´cm, 21 ft´lbf)
12. INSTALL NO.2 TIMING BELT COVER
(a) Check that the timing belt cover gasket has no cracks or
peeling, etc.
If the gasket has cracks or peeling, etc., replace it using these
steps:
Using a screwdriver and gasket scraper, remove all
the old gasket material.
Thoroughly clean all components to remove all the
loose material.
Remove the backing paper from a new gasket and
install the gasket evenly to the part of the timing belt
cover shaded black in the illustration.
After installing the gasket, press down on it so that
the adhesive firmly sticks to the timing belt cover.
(b) Install the timing belt cover with the 5 bolts.
Torque: 8.5 N´m (85 kgf´cm, 74 in.´lbf)
(c) Install the engine wire protector clamps to the No.3 timing
belt cover.
13. INSTALL TIMING BELT GUIDE
Install the timing belt guide, facing the cup side outward.
Page 1387 of 1897
P18820
A05050
Clamp
Clamp
P18814
P18808
A05052
EM-16
- ENGINE MECHANICALTIMING BELT
1000 Author: Date:
2001 AVALON (RM808U)
10. REMOVE NO.1 TIMING BELT COVER
Remove the 4 bolts and timing belt cover.
11. REMOVE TIMING BELT GUIDE
12. REMOVE NO.2 TIMING BELT COVER
(a) Disconnect the engine wire protector clamps from the
No.3 timing belt cover.
(b) Remove the 5 bolts and timing belt cover.
13. REMOVE RH ENGINE MOUNTING BRACKET
Remove the 2 bolts, nut and mounting bracket.
14. SET NO.1 CYLINDER TO TDC/COMPRESSION
(a) Temporarily install the crankshaft pulley bolt to the crank-
shaft.
(b) Turn the crankshaft, and align the timing marks of the
crankshaft timing pulley and oil pump body.
NOTICE:
Always turn the crankshaft clockwise.
(c) Check that timing marks of the camshaft timing pulleys
and No.3 timing belt cover are aligned.
If not, turn the crankshaft 1 revolution (360°).
(d) Remove the crankshaft pulley bolt.
Page 1390 of 1897
EM03V-03
P18805
A05273
RH EX
RH IN
LH IN
LH EX 3 3
11Front
2266 EM-4
- ENGINE MECHANICALVALVE CLEARANCE
988 Author: Date:
2001 AVALON (RM808U)
VALVE CLEARANCE
INSPECTION
HINT:
Inspect and adjust the valve clearance when the engine is cold.
1. REMOVE RH FENDER APRON SEAL
2. DRAIN ENGINE COOLANT
3. REMOVE V-BANK COVER
(a) Using a 5 mm hexagon wrench, remove the 3 cap nuts.
(b) Loosen the V-bank cover fastener counterclockwise.
(c) Remove the V-bank cover.
4. REMOVE AIR INTAKE CHAMBER ASSEMBLY (See
page EM-31)
5. REMOVE IGNITION COILS
6. DISCONNECT UPPER RADIATOR HOSE FROM WA-
TER OUTLET
7. REMOVE CYLINDER HEAD COVERS
(See page EM-31)
8. SET NO.1 CYLINDER TO TDC/COMPRESSION
(a) Turn the crankshaft pulley, and align its groove with the
timing mark º0º of the No.1 timing belt cover.
(b) Check that the valve lifters on the No.1 (IN and EX) are
loose.
If not, turn the crankshaft 1 revolution (360°) and align the mark
as above.
9. INSPECT VALVE CLEARANCE
(a) Check only those valves indicated in the illustration.
(1) Using a feeler gauge, measure the clearance be-
tween the valve lifter and camshaft.
(2) Record out of specification valve clearance mea-
surements. They will be used later to determine the
required replacement adjusting shim.
Valve clearance (Cold):
Intake0.15 - 0.25 mm (0.006 - 0.010 in.)
Exhaust0.25 - 0.35 mm (0.010 - 0.014 in.)
Page 1393 of 1897
P12979
SST (A)
SST (B)
- ENGINE MECHANICALVALVE CLEARANCE
EM-7
991 Author: Date:
2001 AVALON (RM808U)
(c) Install a new adjusting shim.
(1) Place a new adjusting shim on the valve lifter, with
imprinted numbers facing down.
(2) Press down the valve lifter with SST (A), and re-
move SST (B).
SST 09248-55040 (09248-05410, 09248-05420)
(d) Recheck the valve clearance.
11. REINSTALL CYLINDER HEAD COVERS
(See page EM-59)
12. CONNECT UPPER RADIATOR HOSE TO WATER OUT-
LET
13. REINSTALL IGNITION COILS
14. REINSTALL AIR INTAKE CHAMBER ASSEMBLY (See
page EM-59)
15. INSTALL V-BANK COVER
(a) Using a 5 mm hexagon wrench, install the V-bank cover
with the 3 cap nuts.
(b) Press down the V-bank cover fastener.
16. REFILL WITH ENGINE COOLANT
17. START ENGINE AND CHECK FOR LEAKS
18. REINSTALL RH FENDER APRON SEAL
Page 1403 of 1897
IG0DL-02
SPARK TEST
CHECK CONNECTIONS OF IGNITION COIL (WITH
CHECK POWER SUPPLY TO IGNITION COILS (WITH
1. Turn ignition switch to ON.
2. Check that there is battery positive voltage at ignition
CHECK RESISTANCE OF SENSORS
Resistance: Cold Hot
Camshaft position sensor
Crankshaft position sensor835 - 1,400 W
1,630 - 2,740 W1,060 - 1,645 W
2,065 - 3,225 W
CHECK IGT SIGNAL FROM ECM (See page DI-1 17)
TRY ANOTHER IGNITION COIL (WITH IGNITER) IGNITER) CONNECTORS
coil positive (+) terminal.
(See steps 4 and 5)NO
OK
NO
OK
OK
BAD
OK
BAD
BAD
BAD
Connect securely.
Replace ignition coil (with igniter).
Check wiring between ignition switch to
Replace camshaft position sensor.
Check wiring between ECM and ignition ignition coils (with igniters).
coils (with igniters), and then try another CHANGE IT TO NORMAL IGNITION COIL (WITH IGNITER)
AND PERFORM SPARK TEST AGAIN
Replace crankshaft position sensor.
ECM. OK IGNITER)
- IGNITIONIGNITION SYSTEM
IG-1
1244 Author: Date:
2001 AVALON (RM808U)
IGNITION SYSTEM
ON-VEHICLE INSPECTION
NOTICE:
ºColdº and ºHotº in these sentences express the tempera-
ture of the coils themselves. ºColdº is from -10°C (14°F) to
50°C (122°F) and ºHotº is from 50°C (122°F) to 100°C
(212°F).
1. INSPECT SPARK TEST
Check that the spark occurs.
(1) Remove the ignition coils (with igniters) (See page
IG-5).
(2) Remove the spark plugs.
(3) Install the spark plug to the ignition coil, and connect
the ignition coil connector.
(4) Ground the spark plug.
(5) See if spark occurs while engine is being cranked.
NOTICE:
To prevent gasoline from being injected from injectors dur-
ing this test, crank the engine for no more than 5 - 10 se-
conds at time.
If the spark does not occur, do the test as follows:
Page 1404 of 1897
IG0147
Megger
Ground
B02629
P13225
16 mm Plug
Wrench
B02630
1.1 mm IG-2
- IGNITIONIGNITION SYSTEM
1245 Author: Date:
2001 AVALON (RM808U)
2. INSPECT SPARK PLUGS
NOTICE:
Never use a wire brush for cleaning.
Never attempt to adjust the electrode gap on a used
spark plug.
Spark plugs should be replaced every 193,000 km
(120,000 miles).
(a) Remove the 6 ignition coils (with igniters) (See page
IG-5).
(b) Inspect the electrode.
Using a megger (insulation resistance meter), mea-
sure the insulation resistance.
Standard correct insulation resistance:
10 MW or more
If the resistance is less than specified, proceed to step (d).
HINT:
If a megger is not available, these simple method of inspection
provides fairly accurate results.
Simple Method:
Quickly race the engine to 4,000 rpm 5 times.
Remove the spark plug (See step (c)).
Visually check the spark plug.
If the electrode is dry ... OK
If the electrode is wet ... Proceed to step (d)
Reinstall the spark plug (See step (g)).
(c) Using a 16 mm plug wrench, remove the 6 spark plugs.
(d) Visually check the spark plug for thread damage and insu-
lator damage.
If abnormal, replace the spark plug.
Recommended spark plug:
DENSO madeSK20R11
NGK madeIFR6A11
(e) Inspect the electrode gaps.
Maximum electrode gap for used spark plug:
1.3 mm (0.051 in.)
If the gap is greater than maximum, replace the spark plug.
Correct electrode gap for new spark plug:
1.1 mm (0.043 in.)
NOTICE:
If adjusting the gap of a new spark plug, bend only the base
of the ground electrode. Do not touch the tip. Never attempt
to adjust the gap on the used plug.
