159200-4420 ZEXEL 9 421 618 819 BOSCH GOVERNOR HOUSING 9421618819 1592004420 1157211960

(1) Outer spring: Length under test force ... 27.4 mm (1.08 in.)Test force ... 180 9 N (40 2 lb.)Free length after test ... 45.2 mm (1.78 in.)(Damper coils of spring go toward cylinder head.)(2) Inner spring: Length under test force ... 23.88 mm (.940 in.)Test force ... 69 9 N (15.4 2 lb.)Free length after test ... 39.6 mm (1.56 in.)(Damper coils of spring go toward cylinder head.)(3) Valve guides: Inside diameter ... 9.507 to 9.543 mm (.3743 to .3757 in.)Outside diameter ... 15.921 to 15.933 mm (.6268 to .6273 in.)Parent bore diameter in cylinder head for valve guide ... 15.867 to 15.893 mm (.6247 to .6257 in.)Interference fit of guide in cylinder head ... 0.028 to 0.066 mm (.0011 to .0026 in.)Overall length of guide: Intake ... 57.94 mm (2.281 in.)Exhaust ... 61.11 mm (2.406 in.)Projection of guide above valve spring recess ... 15.09 mm (.594 in.)(4) Intake valve: Valve stem diameter ... 9.42 to 9.45 mm (.371 to .372 in.)Clearance of valve in guide ... 0.058 to 0.119 mm (.0023 to .0047 in.)Maximum permissible clearance of valve in guide ... 0.13 mm (.005 in.)Valve head diameter ... 44.09 to 44.35 mm (1.736 to 1.746 in.) Grinding angles: Valve face angle ... 45°Valve seat angle ... 45°Valve head depth below cylinder head face: Minimum ... 1.02 mm (.040 in.)Maximum ... 1.27 mm (.050 in.)Service wear limit ... 1.52 mm (.060 in.)Overall length of valve ... 122.71 to 123.11 mm (4.831 to 4.847 in.)(5) Exhaust valve: Valve stem diameter ... 9.42 to 9.45 mm (.371 to .372 in.)Clearance of valve in guide ... 0.058 to 0.119 mm (.0023 to .0047 in.)Maximum permissible clearance of valve in guide (all models) ... 0.15 mm (.006 in.)Valve head diameter ... 37.26 to 37.52 mm (1.467 to 1.477 in.)Grinding angles: Valve face angle ... 45°Valve seat angle ... 45°Valve head depth below cylinder head face: Minimum ... 1.02 mm (.040 in.)Maximum ... 1.27 mm (.050 in.)Service wear limit ... 1.52 mm (.060 in.)Overall length of valve ... 123.11 to 123.52 mm (4.847 to 4.863 in.)(6) Maximum permissible depth of bore to grind the flare of the valve seat ... 2.69 to 2.79 mm (.106 to .110 in.)(7) Angle to grind flare of valve seat ... 33° (8) Use the dimensions that follow to machine the recess into the cylinder head for valve seat inserts not already installed in the head. Intake: A ... 7.19 to 7.32 mm (.283 to .288 in.)B ... 51.219 to 51.245 mm (2.0165 to 2.0175 in.)C (Radius) ... 0.38 mm (.015 in.)Exhaust: A ... 9.53 to 9.65 mm (.375 to .380 in.)B ... 42.62 to 42.65 mm (1.678 to 1.679 in.)C (Radius) ... 0.38 mm (.015 in.)