Aeon AT56-69E, Service Manual, Page: 69 / 196

ENGINE
4-16
3. Check de-compressor movement smooth on camshaft.
4. Inspect cam lobes surface, Replace it if has pitting, scratches
or blue discoloration.
5. Measure both intake and exhaust cam lobes length. Replace
it if out of specification.
CAM LOBE HEIGHT
Intake
Limit: 32.32 mm
Exhaust
Limit: 31.41 mm
Cam Chain Sprocket Inspection
1. Inspect Camshaft sprocket, Replace the camshaft sprocket
and timing chain as a set if they are worn or damaged.
2. Measure the space of cam chain and cam sprocket. Replace
the camshaft sprocket and timing chain as a set if the space out
of 1/4 of width tooth.
ROCKER ARM/SHAFT DISASSEMBLY AND
INSPECTION
1. Remove rocker arm shaft and rocker arm from cylinder
head.
2. Measure the inside diameter of rocker arm hole and outside
diameter of rocker arm shaft. Replace them if Out of
specification.
SERVICE LIMITATION
Rock Arm Hole: 12.15mm
Rocker Arm Shaft: 11.90mm
3. Inspect Valve adjusters, replace it if has blue discoloration,
pitting or scratches.