STi TIMING B EL T
I N S T R U C T I O N S
Thank you for your purchase of SPT Performance Parts.
The following instructions have been provided to you as a courtesy
of Subaru of America, Inc.
Installation instructions are intended only for certified trained
automotive technicians or those with the necessary automotive
knowledge to properly complete the job. In some cases, special
tools may be required. Installation should never be undertaken by
unqualified persons or by those lacking the necessary tools and
facilities.
Subaru of America, Inc. reserves the right to alter these installation
instructions at any time without prior notification to customers.
11/2003
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3) Remove the A/C belt.
4) Remove the A/C belt tensioner.
Remove the crankshaft pulley
1) Remove the crankshaft pulley bolt. To lock
crankshaft, use:
ST 499977300 CRANKSHAFT PULLEY WRENCH
2) Remove the crankshaft pulley.
Remove the timing belt cover
1) Remove the left-hand belt cover (A).
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2) Remove the right-hand belt cover (B).
3) Remove the front belt cover (C).
Remove the timing belt
1) Remove the timing belt guides. (MT vehicle)
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2) If the alignment mark and/or arrow mark (which
indicates rotation direction) on timing belt fade
away, put new marks before removing the timing
belt as follows:
(A) Turn the crankshaft using ST 499987500 and align
alignment marks on crankshaft sprocket, lefthand
intake camshaft sprocket, left-hand exhaust
camshaft sprocket, right-hand intake camshaft
sprocket and right hand exhaust camshaft
sprocket with notches of belt cover and cylinder
block.
ST 499987500 CRANKSHAFT SOCKET
(B) Using white paint, put alignment and/or arrow
marks on the timing belts in relation to the
sprockets.
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Z1: 54.5 tooth length
Z2: 51 tooth length
Z3: 28 tooth length
3) Remove the belt idler (A).
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4) Remove the timing belt.
CAUTION:
After the timing belt has been removed, never
rotate the intake and exhaust, camshaft sprocket.
If the camshaft sprocket is rotated, the intake
and exhaust valve heads strike together
and valve stems are bent.
Remove the automatic belt tension adjuster
assembly
1) Remove the automatic belt tension adjuster assembly.
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Install the automatic belt tension adjuster assembly and belt
idler
CAUTION:
• Always use a vertical type pressing tool to
move the adjuster rod down.
• Do not use a lateral type vise.
• Push the adjuster rod vertically.
• Be sure to slowly move the adjuster rod down
applying a pressure of 294 N (30 kgf, 66 lb).
• Press-in the push adjuster rod gradually taking
more than three minutes.
• Do not allow press pressure to exceed 9,807
N (1,000 kgf, 2,205 lb).
• Press the adjuster rod as far as the end surface
of the cylinder. Do not press the adjuster
rod into the cylinder. Doing so may damage the
cylinder.
• Do not release the press pressure until stopper
pin is completely inserted.
(1) Attach the automatic belt tension adjuster
assembly to the vertical pressing tool.
(2) Slowly move the adjuster rod down with a
pressure of 294 N (30 kgf, 66 lb) until the adjuster
rod is aligned with the stopper pin hole in the
cylinder.
(3) With a 2 mm (0.08 in) dia. stopper pin or a 2
mm (0.08 in) (nominal) dia. hex bar wrench inserted
into the stopper pin hole in the cylinder,
secure the adjuster rod.
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4) Install the automatic belt tension adjuster assembly.
Tightening torque:
39 N·m (4.0 kgf-m, 28.9 ft-lb)
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Install the timing belt
Crankshaft and camshaft sprocket alignment
(1) Align mark (A) on the crankshaft sprocket
with mark on the oil pump cover at cylinder
block.
(2) Align single line mark (A) on the right-hand
exhaust camshaft sprocket with notch (B) on
belt cover.
(3) Align single line mark (A) on the right-hand
intake camshaft sprocket with notch (B) on belt
cover.
(Make sure double lines (C) on intake camshaft
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and exhaust camshaft sprockets are aligned.)
(4) Align single line mark (A) on left-hand exhaust
camshaft sprocket with notch (B) on belt
cover by turning the sprocket counterclockwise
(as viewed from front of engine).
(5) Align single line mark (A) on left-hand intake
camshaft sprocket with notch (B) on belt cover
by turning the sprocket clockwise (as viewed
from front of engine).
Ensure double lines (C) on intake and exhaust
camshaft sprockets are aligned.
(6) Ensure camshaft and crankshaft sprockets
are positioned properly.
CAUTION:
• Intake and exhaust camshafts for this DOHC
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engine can be independently rotated with the
timing belts removed. As can be seen from the
figure, if the intake and exhaust valves are lifted
simultaneously, their heads will interfere with
each other, resulting in bent valves.
(A) Intake camshaft
(B) Exhaust camshaft
• When the timing belts are not installed, four
camshafts are held at the “zero-lift” position,
where all cams on camshafts do not push the
intake and exhaust valves down. (Under this
condition, all valves remain unlifted.)
• When the camshafts are rotated to install the
timing belts, #2 intake and #4 exhaust cam of
left-hand camshafts are held to push their corresponding
valves down. (Under this condition,
these valves are held lifted.) Right-side camshafts
are held so that their cams do not push
valves down.
• Left-hand camshafts must be rotated from
the “zero-lift” position to the position where the
timing belt is to be installed at as small an angle
as possible, in order to prevent mutual interference
of intake and exhaust valve heads.
• Do not allow the camshafts to rotate in the direction
shown in the figure as this causes both
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intake and exhaust valves to lift simultaneously,
resulting in interference with their heads.
7) Installation of timing belt:
Align the alignment mark on the timing belt with marks on the sprockets in the
alphabetical order shown in
the figure. While aligning marks, position the timing belt properly.
CAUTION:
• Disengagement of more than three timing belt teeth may result in interference
between the valve
and piston.
• Ensure the belt’s rotating direction is correct.
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8) Install the belt idlers.
Tightening torque:
39 N·m (4.0 kgf-m, 28.9 ft-lb)
CAUTION:
Make sure that the marks on the timing belt and
sprockets are aligned.
9) After ensuring that the marks on the timing belt
and sprockets are aligned, remove the stopper pin
from tensioner adjuster.
10) Install the timing belt guide. (MT vehicle)
(1) Temporarily tighten the remaining bolts.
(2) Check and adjust clearance between the
timing belt and timing belt guide.
Clearance:
1.0 +/- 0.5 mm (0.039 +/- 0.020 in)
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(11) Tighten the remaining bolts.
Tightening torque:
9.8 N·m (1.0 kgf-m, 7.2 ft-lb)
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Install the timing belt cover
1) Install the front belt cover (C).
Tightening torque:
5 N·m (0.5 kgf-m, 3.6 ft-lb)
2) Install the right-hand belt cover (B).
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Tightening torque:
5 N·m (0.5 kgf-m, 3.6 ft-lb)
3) Install the left-hand belt cover (A).
Tightening torque:
5 N·m (0.5 kgf-m, 3.6 ft-lb)
Install the crankshaft pulley
1) Install the crankshaft pulley.
2) Install the pulley bolt.
To lock the crankshaft, use:
ST 499977300 CRANKSHAFT PULLEY
WRENCH
(3) Clean the crankshaft pulley thread using an
air jet.
(4) Apply engine oil to the crankshaft pulley bolt
seat and thread.
(5) Tighten the bolts temporarily with tightening
torque of 44 N·m (4.5 kgf-m, 33 ft-lb).
(6) Tighten the crankshaft pulley bolts.
Tightening torque:
127 N·m (13 kgf-m, 94.0 ft-lb)
7) Confirm that the tightening angle of the crankshaft
pulley bolt is 45 degrees or more. If not, conduct
the following procedures (1) through (4).
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CAUTION:
If the tightening angle of crankshaft pulley bolt
is less than 45 degrees, the bolt should be damaged.
In this case, the bolt must be replaced.
(8) Replace the crankshaft pulley bolts and
clean them.
Crankshaft pulley bolt:
12369AA011
(9) Clean the crankshaft thread using an air
jet.
(10) Tighten the bolts temporarily with tightening
torque of 44 N·m (4.5 kgf-m, 33 ft-lb).
(11) Tighten the crankshaft pulley bolts keeping
them in an angle between 65 degrees and 75
degrees.
CAUTION:
Conduct the tightening procedures by confirming
the turning angle of the crankshaft pulley
bolt referring to the gauge indicated on the belt
cover.
12) Install the A/C belt tensioner.
13) Install the A/C belt.
14) Install the Alternator / Power Steering belt.
15) Tighten the slider bolt (B) until belt is snug.
16) Tighten the lock bolt (A).
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Tightening torque:
Lock bolt through bolt:
25 N·m (2.5 kgf-m, 18 ft-lb)
Slider bolt:
8 N·m (0.8 kgf-m, 5.5 ft-lb)
17) Install the belt cover.
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