Page 113 of 4770
E. Inspect camshaft gear spring
Using a vernier caliper, measure the free distance
between the spring ends.
Free distance:
22.5 ± 22.9 mm (0.886 ± 0.902 in.)
If the free distance is not as specified, replace the gear
spring.
F. Inspect camshaft journal oil clearance
(a) Clean the bearing caps and camshaft journals.
(b) Place the camshafts on the cylinder head.
(c) Lay a strip of Plastigage across each of the camshaft
journals. D. Inspect camshaft bearings
Check that bearings for flaking and scoring.
If the bearings are damaged, replace the bearing caps
and cylinder head as a set.
(d) Install the bearing caps.
(See step 4 on pages EG1±69 to 71)
Torque: 19 N±m (190 kgf±cm, 14 ft±lbf)
NOTICE: Do not turn the camshaft.
(e) Remove the bearing caps.
± 5S±FE ENGINEENGINE MECHANICALEG1±63
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G. Inspect camshaft thrust clearance
(a) Install the camshaft.
(See step 4 on pages EG1±69 to 71)
(b) Using a dial indicator, measure the thrust clearance
while moving the camshaft back and forth.
Standard thrust clearance:
Intake
0.045 ± 0.100 mm (0.0018 ± 0.0039 in.)
Exhaust
0.030 ± 0.085 mm (0.0012 ± 0.0033 in.)
Maximum thrust clearance:
Intake
0.12 mm (0.0047 in.)
Exhaust
0.10 mm (0.0039 in.)
If the thrust clearance is greater than maximum, re±
place the camshaft. If necessary, replace the bearing
caps and cylinder head as a set.
H. Inspect camshaft gear backlash
(a) Install the camshafts without installing the exhaust
cam sub gear.
(See step 4 on pages EG1±69 to 71)
(b) Using a dial indicator, measure the backlash.
Standard backlash:
0.020 ± 0.200 mm (0.0008 ± 0.0079 in.)
Maximum backlash:
6.30 mm (0.0188 in.)
If the backlash is greater then maximum, replace the
camshafts. (f) Measure the Plastigage at its widest point.
Standard oil clearance:
0.025 ± 0.062 mm (0.0010 ± 0.0024 In.)
Maximum oil clearance:
0.10 mm (0.0039 in.)
If the oil clearance is greater than maximum, replace
the camshaft. If necessary, replace the bearing caps
and cylinder head as a set.
(g) Completely remove the Plastigage.
± 5S±FE ENGINEENGINE MECHANICALEG1±64
Page 115 of 4770
(c) Subtract the lifter diameter measurement from the
lifter bore diameter measurement.
Standard oil clearance:
0.024 ± 0.052 mm (0.0009 ± 0.0020 in.)
Maximum oil clearance:
0.07 mm (0.0028 In.)
If the oil clearance is greater than maximum, replace
the lifter. If necessary, replace the cylinder head.
12. INSPECT MANIFOLDS
Using a precision straight edge and feeler gauge, mea±
sure the surface contacting the cylinder head for war±
page.
Maximum warpage:
0.30 mm (0.0 118 In.)
If warpage is greater than maximum, replace the man±
ifold. 11. INSPECT VALVE LIFTERS AND LIFTER BORES
(a) Using a caliper gauge, measure the lifter bore diame±
ter of the cylinder head.
Lifter bore diameter:
31.000 ± 31.018 mm (1.2205 ± 1.2213 In.)
(b) Using a micrometer, measure the lifter diameter.
Lifter diameter:
30.966 ± 30.976 mm (1.2191 ± 1.2195 in.)
± 5S±FE ENGINEENGINE MECHANICALEG1±65
Page 116 of 4770
CYLINDER HEAD ASSEMBLY
(See Components for Removal and Installation)
HINT:
wThoroughly clean all parts to be assembled.
Before installing the parts, apply new engine oil to all
sliding and rotating surfaces.
wReplace all gaskets and oil seals with new ones.
(c) Using SST, compress the valve spring and place the 2
keepers around the valve stem.
SST 09202 ± 70010(b) Install the following parts:
(1) Valve
(2) Spring seat
(3) Valve spring
(4) Spring retainer 1. INSTALL VALVES
(a) Using SST, push in a new oil seal.
SST 09201 ±41020
HINT: The intake valve oil seal is brown and the
exhaust valve oil seal is black.
± 5S±FE ENGINEENGINE MECHANICALEG1±66
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CYLINDER HEAD INSTALLATION
(See Components for Removal and Installation)
1. INSTALL CYLINDER HEAD
A. Place cylinder head on cylinder block
(a) Place a new cylinder head gasket in position on the
cylinder block.
NOTICE: Be careful of the installation direction.
(b) Place the cylinder head in position on the cylinder
head gasket.
B. Install cylinder head bolts
HINT:
wThe cylinder head bolts are tightened in 2 progressive
steps (steps (b) and (d)).
wIf any cylinder head bolt is broken or deformed, re±
place it.
(a) Apply a light coat of engine oil on the threads and
under the heads of the cylinder head bolts.
(b) Using SST, install and uniformly tighten the 10 cylin±
der head bolts and plate washers in several passes, in
the sequence shown.
SST 09011± 38121
Torque: 49 N±m (500 kgf±cm, 36 ft±lbf)
If any one of the cylinder head bolts does not meet the
torque specification, replace the cylinder head bolt.2. INSTALL VALVE LIFTERS AND SHIMS
(a) Install the valve lifter and shim.
(b) Check that the valve lifter rotates smoothly by hand. (d) Using a plastic±faced hammer, lightly tap the valve
stem tip to assure proper fit.
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Page 118 of 4770
2. INSTALL SPARK PLUG TUBES
(a) Clean the cylinder head tube holes of any residua!
adhesive, oil or foreign particles. Remove any oil with
kerosene or gasoline.
(b) Screw the threads of the spark plug tube coated with
adhesive into the cylinder head.
(c) Using the spark plug tube nut and a 30 mm socket
wrench, tighten the spark plug tubes.
Torque: 39 N±m (400 kgf±cm, 29 ft±lbf)
(b) Install the following parts:
(1) Camshaft gear spring
(2) Camshaft sub gear
(3) Wave washer
HINT: Align the pins on the gears with the spring ends.(d) Retighten the cylinder head bolts 90 in the sequence
shown on the previous page.
(e) Check that the painted mark is now at a 90 angle to
front.
3. ASSEMBLY EXHAUST CAMSHAFT
(a) Mount the hexagon wrench head portion of the cam±
shaft in a vise.
NOTICE: Be careful not to damage the camshaft.
(c) Mark the front of the cylinder head bolt head with
paint.
± 5S±FE ENGINEENGINE MECHANICALEG1±68
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A. Install intake camshaft
(a) Apply MP grease to the thrust portion of the cam±
shaft.
(b) Place the intake camshaft at 80±1155 BTDC of cam±
shaft angle, on the cylinder head.
HINT: The above angle arrows the No.1 and No.3
cylinder cam lobes of the intake camshaft to push
their valve lifters evenly. 4. INSTALL CAMSHAFTS
NOTICE: Since the thrust clearance of the camshaft is
small, the camshaft must be kept level while it is being
installed. If the camshaft is not kept level, the portion of
the cylinder head receiving the shaft thrust may crack or
be damaged, causing the camshaft to seize or break. To
avoid this, the following steps should be carried out.
(d) Insert a service bolt (A) into the service hole of the
camshaft sub gear.
(e) Using a screwdriver, align the holes of the camshaft
main gear and sub gear by turning camshaft sub gear
clockwise, and install a service bolt (13).
NOTICE: Be careful not to damage the camshaft.
(c) Apply seal packing to the No. 1 bearing cap as shown.
Seal packing:
Part No.08826 ±00080 or equivalent (c) Using snap ring pliers, install the snap ring.
± 5S±FE ENGINEENGINE MECHANICALEG1±69
Page 120 of 4770
B. Install exhaust camshaft
(a) Set the knock pin of the intake camshaft at 10±455
BTDC of camshaft angle.
HINT: The above angle allows the No.2 and No.4
cylinder cam lobes of the exhaust camshaft to push
their valve lifters evenly.(e) Apply a light coat of engine oil on the threads and
under the heads of the bearing cap bolts.
(f) Install and uniformly tighten the 10 bearing cap bolts
in several passes, in the sequence shown.
Torque: 19 N±m (190 kgf±cm, 14 ft±lbf)
(h) Using SST, tap in the oil seal.
SST 09223±4601 1 (d) Install the bearing caps in their proper locations.
(g) Apply MP grease to a new oil seal lip.
± 5S±FE ENGINEENGINE MECHANICALEG1±70