SERVICE DATA AND SPECIFICATIONS (SDS) — Inspection and Adjustment (Cont'd): Valve Distance, Valve Guide, Cylinder Block, Camshaft, Piston, Piston Pin (Supplement-V)
EM-5048spec tableSource contains several inconsistencies in the camshaft bearing inner-diameter inch ranges: row 1 '1.1026 - 1.0840' (decreasing — 1.1026 corresponds to ~28.005 mm not 27.505 mm); row 2 inner-diameter mm '28.505 - 28.033' is decreasing. Preserved verbatim, not corrected. Source piston protrusion 1.04-1.14 mm differs slightly from EM-5042's 'Final Protrusion Dimension' 1.09 ± 0.05 mm (1.04-1.14 = 1.09 ± 0.05 — these agree). Cylinder bore inner diameter standard matches EM-5037 (77.011-77.038).
Inspection and Adjustment (Cont'd)
Cylinder head to valve distance
Cylinder head to valve distance
Intake
Standard0.85 - 1.19 (0.033 - 0.047)
Exhaust
Standard1.05 - 1.39 (0.041 - 0.055)
Valve guide
Valve guide
Valve guide outer diameter
Standard13.048 - 13.059 (0.5137 - 0.5141)
Service13.578 - 13.589 (0.5346 - 0.5354)
Valve guide inner diameter (Finished size)
Standard7.02 - 7.042 (0.2764 - 0.2772)
Service
Cylinder head valve guide hole diameter
Standard12.965 - 12.997 (0.5104 - 0.5117)
Service13.495 - 13.527 (0.5313 - 0.5326)
Interference fit of valve guide
Standard0.062 - 0.083 (0.0024 - 0.0033)
Service
Stem to guide clearance
Standard0.025 - 0.052 (0.0010 - 0.0020)
Service
Projection length "L" — Intake
Standard38.7 - 39.3 (1.52 - 1.55)
Service
Projection length "L" — Exhaust
Standard34.7 - 35.3 (1.37 - 1.39)
Service
CYLINDER BLOCK
Cylinder block
Height "H" (nominal)
Value265.23 (10.442)
Cylinder bore inner diameter — Standard
Value77.011 - 77.038 (3.0319 - 3.0330)
CAMSHAFT AND CAMSHAFT BEARING
Camshaft and camshaft bearing
Valve lift — Intake
Journal
Value8.85 (0.348)
Valve lift — Exhaust
Journal
Value8.90 (0.350)
Camshaft journal to bearing clearance — Standard
Journal
Value0.025 - 0.074 (0.0010 - 0.0029)
Inner diameter of camshaft bearing
Journal1st
Value27.505 - 27.533 (1.1026 - 1.0840)
Inner diameter of camshaft bearing
Journal2nd
Value28.505 - 28.033 (1.1026 - 1.1037)
Inner diameter of camshaft bearing
Journal3rd
Value28.505 - 28.533 (1.1222 - 1.1233)
Outer diameter of camshaft journal D
Journal1st
Value27.459 - 27.48 (1.0811 - 1.0819)
Outer diameter of camshaft journal D
Journal2nd
Value27.959 - 27.98 (1.1007 - 1.1016)
Outer diameter of camshaft journal D
Journal3rd
Value28.459 - 28.48 (1.1204 - 1.1213)
PISTON, PISTON RING AND PISTON PIN
Piston
Piston
Piston skirt diameter A
Value76.939 (3.0291)
Piston pin hole diameter (d)
Value23.003 - 23.008 (0.9056 - 0.9058)
Piston-to-cylinder bore clearance
Value0.07 - 0.10 (0.0028 - 0.0039)
Piston protrusion
Value1.04 - 1.14 (0.0409 - 0.0449)
Piston pin
Piston pin
Piston pin outer diameter
Value22.996 - 23.000 (0.9054 - 0.9055)
Interference fit of piston pin to piston
Value0.003 - 0.012 (0.0001 - 0.0005)
Piston pin to connecting rod bushing clearance — Standard
Value0.011 - 0.02 (0.0004 - 0.0008)
NOTE
* Values measured at ambient temperature of 20°C (68°F).