ENGINE 83 Fig. 2 Fig. 1 Fig. 3 VALVES, VALVE GUIDES, VALVE SPRINGS, VALVE SEATS REMOVAL OF VALVES (Cylinder head removed) 1 Place cylinder head on two suitable wooden supports. 2 Press springs with help of valve spring compressor, 312 589 02 31 and support rail 312.589 03 31 duly counter-supporting poppet of valve to be removed. Fig. 1. 3 Remove lock halves from valve stem and remove them out. 4 Remove spring retainer, springs and guide seal. 5 Remove washer between springs and cylinder head. 6 Similarly remove remaining valves. INSTALLATION OF VALVES 1 Clean valves, washers, springs, retainers and lock halves. 2 Place cylinder head on two suitable wooden supports. 3 Insert washer and springs. 4 Lubricate valve stem. Insert valve from below into cylinder head. Install guide seal. 5 Place spring retainer over springs and compress (after counter supporting poppet of valve to be assembled) with support rail, 312 589 03 31 and valve spring compressor, 312 589 02 31. Insert lock halves with smaller diameter towards lower side evenly in spring retainer and release pressure on valve spring. Lift cylinder head and slightly tap valve stems with a mallet to ensure that lock halves have locked valve and spring retainer properly. Take care that two halves are centrally located. NOTE : Ensure that distance from valve head to cylinder head parting surface is within specifications. 6 Similarly install remaining valves. MACHINING OF VALVE SEATS Before proceeding for machining of valve seats, check for following a. Check guide bores for wear with ‘GO NO GO’ gauge, 636 589 00 21 for inlet valve guide bore and 2576 5890 02 03 for exhaust valve guide bore. Replace valve guides if ‘NO GO’ gauge passes through bore. b. Ensure that concentricity between valve seat and valve guide bore is maintained within specified limits. Fig. 3.
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