30/ENGINE - WORK ON INDIVIDUAL PARTS 133
19.29Checking the valve springs
301680-10
– Check the valve springs for breakage and wear (visual check).
» If the valve spring is broken or worn:
– Change the valve spring.
– Measure the length of the valve springs.
Valve spring
Minimum length 42.8 mm (1.685 in)
» If the measured value does not meet specifications:
– Change the valve springs.
19.30Checking valve spring seat
500173-01
– Check the valve spring seat for breakage and wear (visual check).
» If the valve spring seat is broken or worn:
– Change the valve spring seat.
– Measure the thickness of the valve spring seat.
Valve spring seat - thickness 1.4… 1.5 mm (0.055… 0.059 in)
» If the measured value does not meet specifications:
– Change the valve spring seat.
19.31Checking the cam levers
301227-10
– Check the cam levers and cam lever shafts for damage and wear.
» If there is damage or wear:
– Change the cam levers and/or cam lever shafts.
19.32Checking cylinder head
301252-10
– Check the valve guides with the special tool .
Limit plug gauge (59029026006) ( p. 229)
» If the special tool is easy to insert into the valve guide:
– Change the valve guide and valve.
– Check the sealing area of the spark plug thread and the valve seats from damage
and cracking.
» If there is damage or cracking:
– Change the cylinder head.
400375-10
– Using a straightedge and the special tool, check the sealing area of the cylinder for
distortion.
Feeler gauge (59029041100) ( p. 229)
Cylinder/cylinder head - distortion of
sealing area
≤ 0.10 mm (≤ 0.0039 in)
» If the measured value does not meet specifications:
– Change the cylinder head.
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