Engine Mechanical Specifications (RPO Code L37)

ENGINE MECHANICAL SPECIFICATIONS (L37)

Cylinder Block Assembly
Crankshaft Main Bearing Bore Diameter 72.430-72.442 mm (2.8516-2.8521 in)
Crankshaft Main Bearing Bore Out-of-Round 0.010 mm (0.0004 in)
Crankshaft Main Rear Oil Seal
Bore 115.962-116.038 mm (4.5654-4.5684 in)
Runout 0.250 mm (0.0098 in)
Cylinder Bore Diameter @ 41 mm (1.610 in) Below Deck Face 92.992-93.008 mm (3.6611-3.6617 in)
Cylinder Bore Out-of-Round
Production 0.010 mm (0.0004 in)
Service 0.100 mm (0.0039 in)
Cylinder Bore Taper
Production 0.010 mm (0.0004 in)
Service 0.100 mm (0.0039 in)
Cylinder Head Deck Height 224.55 mm (8.8406 in)
Cylinder Head Deck Surface Flatness 0.100 mm (0.0039 in)

Piston Rings
Piston Ring End Gap
First Compression Ring 0.250-0.400 mm (0.0098-0.0157 in)
Second Compression Ring 0.350-0.050 mm (0.0138-0.0020 in)
Oil Control Ring 0.250-0.760 mm (0.0098-0.0299 in)
Ring to Groove Clearance
First Compression Ring 0.040-0.095 mm (0.0016-0.0037 in)
Second Compression Ring 0.040-0.095 mm (0.0016-0.0037 in)
Oil Control Ring None - Side Sealing
Piston Ring Thickness
First Compression Ring 1.199-1.203 mm (0.0472-0.0474 in)
Second Compression Ring 1.499-1.504 mm (0.0590-0.0592 in)
Oil Control Ring 2.530-2.555 mm (0.0996-0.1006 in)

Pistons and Pins
Piston
Piston Diameter @ 42 mm (1.6353 in) Below Crown 92.957-92.972 mm (3.6597-3.6603 in)
Piston Pin Bore Diameter 23.002-23.007 mm (0.9056-0.9058 in)
Piston Ring Groove Inside Diameter
First Compression Ring 84.750-85.000 mm (3.3366-3.3464 in)
Second Compression Ring 83.400-83.650 mm (3.2835-3.2933 in)
Oil Control Ring 85.670-85.920 mm (3.3728-3.3827 in)
Piston Ring Groove Width
First Compression Ring 1.230-1.255 mm (0.0484-0.0494 in)
Second Compression Ring 1.530-1.555 mm (0.0602-0.0612 in)
Oil Control Ring 2.530-2.555 mm (0.0996-0.1006 in)
Piston to Bore Clearance 0.020-0.051 mm (0.0008-0.0020 in)
Pin
Piston Pin Clearance to Connecting Rod Bore 0.002-0.014 mm (0.0001-0.0006 in)
Piston Pin Clearance to Piston Pin Bore 0.002-0.012 mm (0.0001-0.0005 in)
Piston Pin Diameter 22.995-23.000 mm (0.9053-0.9055 in)
Piston Pin End Play
Piston Pin Length 61.500-62.000 mm (2.4213-2.4409 in)