Checking Valve Seat Wear Limit

2.Use the valve to be installed and measure from the end of the valve stem to the contact face of the valve spring stop in the cylinder head.

Note:

Distinguishing feature, cylinder head

'87 models onward M 28.41/42

Bearing bridge attachment M 6

Exhaust manifold attachment, 2-bolt flange

3-bolt flange l.The valve seats of the 4-valve-per-cylinder heads can be machined. Do not machine past the wear limit, as otherwise the function of the hydraulic valve tappets is no longer assured.

Size worn

Intake

Exhaust

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