Astro Van M V6-262 4.3L VIN B TBI (1991)
Camshaft: Service and Repair
Fig. 14 Valve Timing Marks
1.
Disconnect battery ground cable.
2.
Remove engine cover and air cleaner, then drain cooling system.
3.
Remove valve cover, rocker arm and pushrods, refer to ROCKER ARMS & PUSHRODS procedure.
4.
Remove valve lifters, refer to VALVE LIFTERS procedure.
5.
Remove distributor.
6.
Remove intake manifold, refer to INTAKE MANIFOLD procedure.
7.
Remove radiator, fan and pulley, then the water pump.
8.
Remove torsional damper using a suitable tool, then the engine front cover.
9.
Align timing marks, Fig. 14, then remove timing chain and camshaft gear. Tap sprocket on its lower edge, using a suitable mallet, to facilitate
removal.
10.
On 1992 models with VIN W, remove camshaft sprocket, stud, balance shaft drive gear and timing chain.
11.
On all models, install two or three 5/16 x 18 x 4 inch bolts into in camshaft bolt holes, then using these bolts as a handle, carefully pull camshaft
from block. Use caution not to damage camshaft bearings.
12.
Reverse procedure to install. When installing camshaft, align marks on camshaft and crankshaft sprockets, Fig. 14. Tighten to specifications. If a
new camshaft is being installed, replace all valve lifters.
