Cylinder Head, Valves and Manifolds Valve Recession - 3TN66: Intake and exhaust valve guides are different. The exhaust valve guide has one groove and the intake valve guide has none. Install valve guides with tapered ends down. Push valve guides down until top of valve guides are a specified distance (A) from top of cylinder head. Intake Valve. . . . . . . . . . . 0.40 mm (0.016 in.) Exhaust Valve . . . . . . . . . 0.85 mm (0.033 in.) Valve Recession - 3TNA72 (3009): Intake Valve. . . . . . . . . . . 0.50 mm (0.020 in.) Exhaust Valve . . . . . . . . . 0.85 mm (0.033 in.) Valve Guide Height “A”: 1 Valve Guides: 3TN66. . . . . . . . . . . . . . . . . . .7 mm (0.276 in.) 3TNA72 (3009) . . . .
. . . . . . .9 mm (0.354 in.) Clean valve guides using a valve guide brush. Ream inside diameter of valve guides using: Measure valve guide inside diameter. - 3TN66: 5.50 mm Valve Guide Reamer Valve Guide I.D. - 3TN66: - 3TNA72 (3009): D-20020WI Valve Guide Reamer Standard . . . . . . . . . . . . . . . . . 5.50 - 5.52 mm . . . . . . . . . . . . . . . . . . . . . . .(0.216 - 0.217 in.) Wear Limit. . . . . . . . . . . . 5.58 mm (0.220 in.) Valve Guide I.D. - 3TNA72 (3009): A Standard . . . . . . . . . . . . . . . . . 7.00 - 7.02 mm . . . . . . . . . . . . . . . . . . . . . . .(0.275 - 0.276 in.) Wear Limit. . . . . . . . . . . .
7.08 mm (0.279 in.) If diameter exceeds wear limit, knurl or replace guide. If diameter is less than wear limit, determine guide- to-stem clearance (guide diameter minus stem diameter). M82193A Valve Springs: If clearance exceeds 0.15 mm (0.006 in.) but is less than 0.20 mm (0.008 in.) , knurl valve guides. Measure spring free length. Replace spring if measurement exceeds specification. Knurl valve guides using: - 3TN66: 5.50 mm Valve Guide Knurler - 3TNA72 (3009): D-20018WI Valve Guide Knurler If clearance exceeds 0.20 mm (0.008 in.) , replace valve guides. Replace valve guides using: - 3TN66: JDG504 Valve Guide Driver - 3TNA72 (3009):
JDE118 Valve Guide Driver 1-26 4/7/95 AllTractorManuals.com M82034A M82034A