movement of the valve stem from side to side crosswise to the head will cause a direct movement of the indicator stem The indicator stem must contact the side of the valve stem just above the cylinder guide With the valve head dropped about 16 off the valve seat mgve the stem of the valve from side to side with light pressure to obtain the clearance By trying new valves in the old bores it can be determined whether the valves should be replaced or the bores reamed and oversize valves installed IOTE Valves with oversize stems are available n the following sizes 003 and 010 Tool et J 5830 01 may be used to ream the bores or new valves fig 6A 56 I T Y 1 Fig 6A 56 Reaming Valve Guide Bores 5 heck valve spring tension with Tool J 8056 fig A 57 TurR Air Engine Spring should be compressed to 1 at which eight it should check 58 to 64 lbs Sup r Turbo Air Engine H P O 649 Spring should be compressed to 111 1 g at which Leight it should check 71 to 81 lbs Weak springs affect power and economy and hould be replaced if not within 5 lbs of the above units Resf iting Valve Seats Ra onditioning the valve seats is very important beca ise the seating of the valves must be perfect for the ngine to deliver the power and performance built into t f A other important factor is the cooling of the valve heal Good contact between each valve and its seat f i k w w w v e i Ile