NR Series ENGINE MECHANICAL  CYLINDER HEAD  REPLACEMENT  

0.063,0.031 0.375,0.188 0.313,0.156 10 false *a 2.323,3.115 2.635,3.271 0.313,0.156 10 false *b

*a	Cylinder Head Sub-assembly Top Side
*b	Protrusion Height

Using a plastic hammer, tap in new ring pins to the cylinder head sub-assembly.

Standard Protrusion Height:

3.0 to 5.0 mm (0.118 to 0.197 in.)

1.385,1.292 0.615,0.344 0.615,0.344 1.354,0.656 true 0.344,0.271 0.802,0.469 0.458,0.198 10 false SST

Using SST and a hammer, tap out the intake valve guide bush.

SST

09201-10000  (09201-01050)
09950-70010  (09951-07100)

Using a caliper gauge, measure the intake valve guide bush bore diameter of the cylinder head sub-assembly.

Standard Intake Valve Guide Bush Bore Diameter:

10.285 to 10.306 mm (0.40492 to 0.40575 in.)

New Guide Bush Selection Chart:

Bush Size	Bush Outer Diameter
STD	10.333 to 10.344 mm (0.40681 to 0.40724 in.)
O/S 0.05	10.383 to 10.394 mm (0.40878 to 0.40921 in.)

HINT:

·

If the intake valve guide bush bore diameter is more than 10.306 mm (0.40575 in.), machine the intake valve guide bush bore to a dimension of 10.335 to 10.356 mm (0.40689 to 0.40772 in.) to install an O/S 0.05 intake valve guide bush.

·

If the intake valve guide bush bore diameter of the cylinder head sub-assembly is more than 10.356 mm (0.40772 in.), replace the cylinder head sub-assembly.

1.094,1.302 0.51,0.302 0.51,0.302 1.115,0.729 true 3.167,0.885 3.344,1.052 0.177,0.167 10 false *a 0.25,0.208 0.708,0.406 0.458,0.198 10 false SST

*a	Protrusion Height

Using SST and a hammer, tap in a new intake valve guide bush to the specified protrusion height.

SST

09201-10000  (09201-01050)
09950-70010  (09951-07100)

Standard Protrusion Height:

9.6 to 10.0 mm (0.378 to 0.394 in.)

Using a sharp 5.5 mm reamer, ream the intake valve guide bush to obtain the specified oil clearance.

Standard Oil Clearance:

0.025 to 0.060 mm (0.000984 to 0.00236 in.)

2.063,1.115 1.656,0.51 1.656,0.51 1.823,0.563 true 1.365,0.417 1.823,0.615 0.458,0.198 10 false SST

Using SST and a hammer, tap out the exhaust valve guide bush.

SST

09201-10000  (09201-01050)
09950-70010  (09951-07100)

Using a caliper gauge, measure the exhaust valve guide bush bore diameter of the cylinder head sub-assembly.

Standard Exhaust Valve Guide Bush Bore Diameter:

10.285 to 10.306 mm (0.40492 to 0.40575 in.)

New Guide Bush Selection Chart:

Bush Size	Bush Outer Diameter
STD	10.333 to 10.344 mm (0.40681 to 0.40724 in.)
O/S 0.05	10.383 to 10.394 mm (0.40878 to 0.40921 in.)

HINT:

·

If the exhaust valve guide bush bore diameter is more than 10.306 mm (0.40575 in.), machine the exhaust valve guide bush bore to a dimension of 10.335 to 10.356 mm (0.40689 to 0.40772 in.) to install an O/S 0.05 exhaust valve guide bush.

·

If the exhaust valve guide bush bore diameter of the cylinder head sub-assembly is more than 10.356 mm (0.40772 in.), replace the cylinder head sub-assembly.

2.177,1.146 1.708,0.615 1.708,0.615 1.927,0.615 true 0.99,0.927 1.302,1.083 0.313,0.156 10 false *a 1.417,0.521 1.875,0.719 0.458,0.198 10 false SST

*a	Protrusion Height

Using SST and a hammer, tap in a new exhaust valve guide bush to the specified protrusion height.

SST

09201-10000  (09201-01050)
09950-70010  (09951-07100)

Standard Protrusion Height:

9.6 to 10.0 mm (0.378 to 0.394 in.)

Using a sharp 5.5 mm reamer, ream the exhaust valve guide bush to obtain the specified oil clearance.

Standard Oil Clearance:

0.030 to 0.065 mm (0.00118 to 0.00256 in.)