CYLINDER HEAD AND BLOCK (CONT) - TM-5-4320-300-14

CLEANING/INSPECTION OF ROCKER ARMS SHAFTS AND BRACKETS

TM-5-4320-300-14 Pump Centrifugal Self-Priming Gasoline Engine Driven; 6-Inch 1500 GPM Capacity At 60 Foot Head Manual
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TM 5-4320-300-14 6-7. CYLINDER HEAD AND BLOCK(CONT) Location/item Action Remarks 12. Valve guides Use a guide brush to clean the inside of valve Valve guides and guides, and inspect the guides for fractures, valve seat inserts chipping, scoring, or excessive wear. Then can be inspected measure the inside diameter of each valve and cleaned with- guide and record the reading. out being removed from the cylinder head. 13. Valve stem Measure outside diameter of valve stem and and guide record the reading. Subtract stem diameter differential reading from guide reading. The difference should be no greater than 0.005 inch (0.127 mm). 14. Valve springs, Inspect for pitting, fracture, excessive wear, or locks, caps, other damage. and seats 15. Spring load If springs are in good condition, check spring load. A load of 25 pounds (11.34 kg) should compress a four-valve cylinder head spring to 1.93 inches (49.02 mm) maximum. The differ- ence in the load between any pair of valve springs should not exceed 6 pounds (2.7 kg). 16. Valve guide Remove and discard. oil seals 17. Valve seat Inspect for wear, pitting, cracking, and proper inserts valve seat angle (31 degrees). 6-31

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