Royal Enfield Interceptor 650 - Service manual > Cylinder Head

Cylinder Head Inspection

• Inspect cylinder head carefully for any cracks, blow holes or damages - especially in the inlet and exhaust ports.
• Place thick straight edge across cylinder head gasket seating surface.
• Insert pointed feeler gauge of 0.01 mm thickness between straight edge and cylinder head.
• Inspect and ensure 4 locations (a, b, c, d) on cylinder head are at same level.

• Ensure feeler enters properly at marked places.

Rocker Cover to Cylinder Head Seating Surface

• Place the thick straight edge across the rocker cover gasket seating surface.
• Insert pointed feeler gauge of 0.01 mm thickness between straight edge and cylinder head at the marked places.

• Ensure feeler enters properly at marked places.

Rocker Cover

• Place thick straight edge across the rocker cover.
• Insert pointed feeler gauge of 0.01 mm thickness between straight edge and rocker cover.
• Inspect and ensure 4 locations (a, b, c, d) on rocker cover are at same level.

Rocker Arm

• Inspect rollers (a) for any wear and/or sticky rotation. Replace if defective.
• Measure the inner diameter (b) of the rocker arm.

Rocker Arm Shaft

• Check rocker arm shaft for pitting, score marks, uneven wear or damage. Replace if defective.
• Measure the diameter of the rocker shaft (a) at the rocker arm working area.

Tappet Adjusters

• Inspect "elephant foot" (a) for any wear and/or sticky rotation. Replace if defective.

Camshaft Run-out

• Inspect camshaft lobes for pitting, score marks, uneven wear or damage.
• Support the cam shaft on the 2 V-blocks (a).
• Rotate the camshaft slowly and measure run-out with a dial gauge (b) at the machined place.

Camshaft Journal OD

• Measure camshaft journal OD (a).

Camshaft Lobe

• Inspect cam lobes for scoring, wear-out and scratches.
• Measure height of each cam lobe (a).

Valve Inspection.

• Check each valve for wear, burn or distortion at its face and stem end. Replace valve, if necessary.
• Check valve stem end face for pitting and wear.
• When it is worn out, replace the valve.

Valve Guide ID (Inlet and Exhaust)

• Using micrometer and bore gauge, measure the ID of the valve guides at the top and bottom working area inside the guides.

Valve Spring (Inlet and Exhaust)

• Measure load on installed and working condition.

Valve Stem OD (Inlet and Exhaust Valve)

• Measure diameter at marked places along the length of each stem.

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