Engine - Valve Compression Spring Modification

REFERENCE ENGINE
NUMBER 043/TS155
DATE 8-20-82
MODEL MA07

Valve Compression Springs:

CYLINDER HEAD VALVE COMPRESSION SPRING MODIFICATION

To standardize the cylinder head, the valve spring seat has been recessed by 3 mm. Due to this change, the valve compression springs and their free and installed lengths have also been modified.

PRODUCTION EFFECTIVE:

From Engine Number Production Date

5M-3198694 December, 1981

From Frame Number

JT2MA67**C0018546

Valve Compression Spring Specifications

Previous New

Part Number 90501-45013 90501-45017 90501-45020
(IN/EX) (IN) (EX)

Free Length 47.9 mm 49.1 mm 52.5 mm

Installed Length 40.0 mm 40.0 mm 43.0 mm

Installed Load STD 31.3-34.5 kg 34.7-38.3 kg 33.3-36.7 kg

Square Limit 2.0 mm 2.0 mm 2.0 mm
PART NUMBER INFORMATION:

Previous Part Number New Part Number Part Name Qty/ Unit

11101-49295 *11101-49296 Head sub-assy, cylinder 1
*90501-45017 Spring, Compression (IN) 6
*90501-45020 Spring, Compression (EX) 6

*These parts are interchangeable as a set only.