TM-9-2320-260-34-1

TRUCK, 5-TON, 6X6, M809 SERIES (DIESEL)

TECHNICAL MANUAL; DIRECT SUPPORT AND GENERAL SUPPORT MAINTENANCE; VOLUME 1 OF 2

JULY 1994

TM-9-2320-260-34-1 - Page 206 of 657

TM 9-2320-260-34-1

3-51. CYLINDER HEAD REPAIR (Contd)

8.

9.

10.

Inspect valve seats (4) and injector ports (5) for hot spots. Replace cylinder head (1) if hot spots are

found.

Inspect water passage holes (2) for pits and scratches. If pits and scratches are less that 0.003 in.

(0.076 mm) remove with crocus cloth. Replace cylinder head (1) if pits and scratches are more than

0.003 in. (0.076 mm) deep in the area 0.0625-0.156 in. (1.588-3.962 mm) from edge of water passage

hole (2).

Using straightedge and feeler gage, inspect cylinder head surface (3) for warpage. Replace cylinder

head (1) if warped surface exceeds 0.002 in. (0.051 mm).

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