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EM-38
ENGINE MECHANICAL (1GR-FE) - TIMING CHAIN
EM1XL-01

INSPECTION
1. INSPECT NO.1 AND NO.2 TIMING CHAINS
Using a spring scale, pull the chain sub assembly with 147 N
(15.0 kgf, 33.1 lbf) of force and measure the length of the chain
sub assembly using a vernier caliper.
Measuring Area Maximum chain elongation: 146.8 mm (5.780 in.)
NOTICE:
Perform the same measurements by pulling at random in
0 1 2 3 4 5 15 A23207
3 or more places to obtain an average length.
If the elongation is greater than the maximum, replace the
chain.

2. INSPECT CAMSHAFT TIMING GEAR ASSEMBLY
(a) Put the No. 1 chain on the larger gear of the camshaft tim-
ing gear assembly.
(b) Using a vernier caliper, measure the timing gear with the
chain.
Minimum gear diameter (w/ chain):
115.5 mm (4.547 in.)
NOTICE:
A22990 The vernier caliper must contact the chain rollers for the
measuring.
If the diameter is less than the minimum, replace the No. 1 chain
and camshaft timing gear assembly.
EM-39
ENGINE MECHANICAL (1GR-FE) - TIMING CHAIN

(c) Put the No. 2 chain on the smaller gear of the camshaft
timing gear assembly.
(d) Using a vernier caliper, measure the timing gear with the
chain.
Minimum gear diameter (w/ chain):
73.1 mm (2.878 in.)
NOTICE:
The vernier caliper must contact the chain rollers for the
A22991 measuring.
If the diameter is less than the minimum, replace the No. 2 chain
and camshaft timing gear assembly.

3. INSPECT CAMSHAFT TIMING SPROCKET
(a) Put the No. 2 chain on the camshaft timing sprocket.
(b) Using a vernier caliper, measure the camshaft timing
sprocket diameter with the chain .
Minimum gear diameter (w/ chain):
73.1 mm (2.878 in.)
NOTICE:
The vernier caliper must contact the chain rollers for the
A22992 measuring.
If the diameter is less than the minimum, replace the No. 2 chain
and the camshaft timing sprocket.
EM-40
ENGINE MECHANICAL (1GR-FE) - TIMING CHAIN

4. INSPECT CRANKSHAFT TIMING SPROCKET
(a) Put the No. 1 chain on the crankshaft timing sprocket.
(b) Using a vernier caliper, measure the crankshaft timing
gear diameter with the chain.
Minimum gear diameter (w/ chain):
61.0 mm (2.402 in.)
NOTICE:
The vernier caliper must contact the chain rollers for the
A22993 measuring.
If the diameter is less than the minimum, replace the No. 1 chain
and crankshaft timing sprocket.

5. INSPECT IDLE GEAR NO.1
(a) Put the No. 1 chain on the idle gear.
(b) Using a vernier caliper, measure the idle gear with the
chain.
Minimum gear diameter (w/ chain):
61.0 mm (2.402 in.)
NOTICE:
The vernier caliper must contact the chain rollers for the
A22994 measuring.
If the diameter is less than the minimum, replace the No. 1 chain
and idle gear.

6. INSPECT IDLE GEAR SHAFT OIL CLEARANCE
(a) Using a micrometer, measure the idle gear shaft diameter.
Idle gear shaft diameter:
22.987 to 23.000 mm (0.9050 to 0.9055 in.)

A22995
EM-41
ENGINE MECHANICAL (1GR-FE) - TIMING CHAIN

(b) Using a caliper gauge, measure the inside diameter of the
idle gear.
Idle gear inside diameter:
23.02 to 23.03 mm (0.9063 to 0.9067 in.)
(c) Subtract the idle gear shaft diameter measurement from
the idle gear inside diameter measurement.
Standard oil clearance:
0.020 to 0.043 mm (0.0008 to 0.0017 in.)
A22996 Maximum oil clearance:
0.093 mm (0.0037 in.)
7. INSPECT CHAIN TENSIONER NO.1
(a) Check that the plunger moves smoothly when the ratchet
Raise pawl is raised with a finger.
Lock
Move
(b) Release the ratchet pawl and check that the plunger is
locked in place by the ratchet pawl and does not move
when pushing with a finger.

A22997

8. INSPECT CHAIN TENSIONER NO.2
(a) Check that the plunger moves smoothly.
(b) Measure the worn depth of the chain tensioner slipper.
Maximum depth: 1.0 mm (0.039 in.)
If the depth is greater than the maximum, replace the chain ten-
sioner No. 2.
Move

A22998

9. INSPECT CHAIN TENSIONER SLIPPER
Measure the worn depth of the chain tensioner slipper.
Maximum depth: 1.0 mm (0.039 in.)
If the depth is greater than the maximum, replace the chain ten-
sioner slipper.

A23000
EM-42
ENGINE MECHANICAL (1GR-FE) - TIMING CHAIN

10. INSPECT CHAIN VIBRATION DAMPER NO.1 AND
No.1
NO.2
Measure the worn depth of the chain vibration damper No. 1
and No. 2.
Maximum depth: 1.0 mm (0.039 in.)
If the depth is greater than the maximum, replace the chain
vibration damper No. 1 or No.2.

No.2

A23001

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