45 486 PL ENGINE P Fig. 102 Fig. 101 Fig. 100 Installation : Place valve seat insert in a mixture of methanol and dry ice for about 20-30 min. to br ing its temperature down to -500C. Heat cylinder head to approx. 800C in water bath. CAUTION : The cylinder head should not be locally heated. Install valve seat insert in cylinder head bore quickly by slightly hammering. Fig. 100 & 101 Machine valve seat in cylinder head. Checking of valve seating : Smear valve seat with carbon blue, install valve in guide and turn it slowly under axial pressure. The contact line on valve seat must be around entire circumference at equal width. Check for leakages through valve seat by pouring gasoline on valve head. Gasoline must not seep past valve seat. Fig. 102 (Cylinder head with valves is in inverted condition).
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