Briggs & Stratton 273521, 271172, 270962, CE8069, 276535 manual Main Bearing

REJECT DIMENSIONS	STANDARD SIZE	REJECT SIZE
CYLINDER
Main Bearing	1.1825 in. (30.03 mm)	1.184 in. (30.07 mm)
Camshaft Bearing	.5011 in. (12.72 mm)	.5040 in. (12.80 mm)
Bore Diameter	3.300 in. (83.82 mm)	3.304 in. (83.92 mm)
Bore Out-Of-Round	N/A	.0015 in. (.04 mm)
CYLINDER HEAD
Valve Guide	.236 in. (5.99 mm)	.240 in. (6.10 mm)
Intake Valve Stem Diameter	.234 in. (5.93 mm)	.233 in. (5.92 mm)
Exhaust Valve Stem Diameter	.234 in. (5.93 mm)	.233 in. (5.92 mm)
CYLINDER COVER
Main Bearing	1.1825 in. (30.03 mm)	1.184 in. (30.07 mm)
Camshaft Bearing	.501 in. (12.72 mm)	.504 in. (12.80 mm)
CRANKSHAFT
Crank Pin Journal	1.2485 in. (31.71 mm)	1.2475 in. (31.68 mm)
Mag-Side Journal	1.1795 in. (29.95 mm)	1.178 in. (29.92 mm)
PTO-Side Journal	1.1795 in. (29.95 mm)	1.178 in. (29.92 mm)
CAMSHAFT
Mag-Side Journal	.499 in. (12.67 mm)	.498 in. (12.65 mm)
PTO-Side Journal	.499 in. (12.67 mm)	.498 in. (12.65 mm)
Intake Lobes	1.216 in. (30.88 mm)	1.212 in. (30.77 mm)
Exhaust Lobes	1.216 in. (30.88 mm)	1.212 in. (30.77 mm)
CONNECTING ROD
Crank Pin Bearing	1.250 in. (31.75 mm)	1.252 in. (31.80 mm)
Piston Pin Bearing	.6728 in. (17.09 mm)	.6742 in. (17.12 mm)
PISTON
Piston Pin	.6722 in. (17.07 mm)	.6717 in. (17.06 mm)
Piston Pin Bearing	.6728 in. (17.09 mm)	.6742 in. (17.12 mm)
Ring End Gap (Top)	.008-.016 in. (.15-.25 mm)	.030 in. (.76 mm)
Ring End Gap (Middle)	.008-.016 in. (.15-.25 mm)	.030 in. (.76 mm)
Ring End Gap (Oil Control)	.008-.016 in. (.15-.25 mm)	.030 in. (.76 mm)
Ring Land Clearance (Top)	.002-.003 in. (.05-.08 mm)	.004 in. (.10 mm)
Ring Land Clearance (Middle)	.002-.003 in. (.05-.08 mm)	.004 in. (.10 mm)
Ring Land Clearance (Oil Control)	.002-.004 in. (.05-.10 mm)	.005 in. (.12 mm)

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