D343 ENGINE Caterpillar


Valve Guide And Seat Inserts

Usage:

1 Bore-valve guide ... .3751±.0007 in.9,527±0,018 mm

2 Length-guide ... 2.872 in.72,95 mm

3 Bore depth in head for insert ... .474±.001 in.12,039±0,025 mm

4 Diameter-bore in head for insert (inlet) ... 1.8090±.0005 in.46,049±0,0127 mm

Diameter-insert (inlet) ... 1.8120±.0005 in.46,025±0,0127 mm

Diameter-bore in head for insert (exhaust) ... 1.6840±.0005 in.42,774±0,0127 mm

Diameter-insert (exhaust) ... 1.6870±.0005 in.42,850±0,0127 mm

5 Width-valve seat (inlet) ... .060 in.1,52 mm

Width valve seat (exhaust) ... .074 in.1,88 mm

6 Angle to grind insert face to reduce seat maximum diameter ... 15°15°

7 Closed inlet valve minimum projection ... .075 in.1,90 mm

Closed inlet valve maximum projection ... .133 in.3,38 mm

Closed exhaust valve minimum projection ... .075 in.1,90 mm

Closed exhaust valve maximum projection ... .133 in.3,38 mm

8 Angle-valve seat ... 45°45°

9 Diameter-valve seat:

Inlet seat minimum permissible ... 1.714 in.43,54 mm

Inlet seat maximum permissible ... 1.7456 in.44,34 mm

Exhaust seat minimum permissible ... 1.589 in.40,36 mm

Exhaust seat maximum permissible ... 1.6210 in.40,40 mm

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