Aerostar 2WD V6-245 4.0L (1990)
8. Check the camshaft end play.
Camshaft End Play
CAUTION: Prying against the camshaft gear with the valve train load on the camshaft can break or damage the gear. Therefore, the rocker arm
adjusting nuts must be backed off, or the rocker arm and shaft assembly must be loosened sufficiently to free the camshaft. After checking the
camshaft end play, adjust the valve clearance.
a. Push camshaft toward rear of engine. Install Dial Indicator TOOL-4201-C or equivalent so indicator point is on camshaft sprocket attaching
screw.
b. Zero dial indicator. Pull camshaft forward and release it. Compare dial indicator reading with specifications. Camshaft end play specification is
0.0203-0.1016 mm (0.0008-0.004 in) and camshaft end play service limit is 0.2286 mm (0.009 in). If end play is excessive, replace camshaft
thrust plate.
c. Remove dial indicator.
d. After replacing thrust plate, check end play again. If it is still out of specified range, inspect camshaft and cylinder head/cylinder block for
excessive wear.
