Bulletin No. 1.62-5 Group No. 1.62 December 10, 1998 Page 1 of 1

PISTON PROTRUSION

CORRECT PISTON PROTRUSION IMPROVES ENGINE STARTING

CHARACTERISTICS AND HELPS PREVENT VALVE DAMAGE

The following piston protrusion specifications should be attained when overhauling John Deere engines:

300 Series (except Liter engines) Maximum (0.033mm) 0.013 in.

300 Series (Liter engines) (0.08 – 0.30mm) 0.003 – 0.012 in.

400 Series

4-270 Maximum (0.43mm) 0.017 in.

6-404D Maximum (0.43mm) 0.017 in.

6-404T EARLY Maximum (0.635mm) 0.025 in.

6-404T LATE Maximum (0.76mm) 0.030 in.

6-466 ALL VERSIONS (0.051 – 0.078mm) 0.002 – 0.0309 in.

6076 ALL VERSIONS (0.051 – 0.078mm)

0.002 – 0.031 in.

500 Series

6-531 Maximum (0.254mm) 0.010 in.

6-619 Maximum (0.254mm) 0.010 in.

6101 Maximum (0.762mm) 0.030 in