INSPECTION - CONTINUED -832450372

TM 10-3930-660-24-2

CYLINDER HEAD ASSEMBLY REPAIR - CONTINUED

0270 00

INSPECTION - CONTINUED

NOTE

If a new valve is required, mark replacement location on the valve.

The cylinder head has integral valve guides. Service valve guides can be installed to meet tolerance specifi-

cations after cylinder head is machined.

Measure valve stem diameter. Minimum allowable

diameter is 0.3126 in. (7.9 mm). Mark new valves

respective to their location in the cylinder head.

Inspect valve guide bores for scuffing or scoring. If

guide bores are scuffed or scored, service valve guides

must be installed.

10.

Measure valve guide bore. Maximum allowable diam-

eter is 0.3185 in. (8.1 mm).

11.

If guide bores are worn, service valve guides must be

installed. Refer to Repair in this work package.

12.

Inspect valve seats for scoring, scratches or a burned

409-860

condition.

If a valve seat is scored, scratched or burned it must be ground or replaced. Refer to Repair in this work package.

13.

14.

Visually inspect valve springs for nicks, deep scratches, rust deposits, notches at the end of the spring, and for wear

between coils. Replace valve springs if any of these conditions are found.

WARNING

Eye protection must be worn when performing maintenance where components or particles could fly

out during procedure. Failure to take precautions could cause injury to personnel.

Some components are under spring tension. Wear eye protection and use caution when disassembling

them, to avoid injury.

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