Timing Drive and Camshaft — 3S-FE Engine [Toyota Carina T170]

Both overhead camshafts are driven via a toothed belt and gears on each camshaft and on the crankshaft. The toothed belt is connected only to the exhaust camshaft, through which the intake camshaft is driven by gears. The crankshaft gear is located behind the crankshaft pulley. The toothed belt is tensioned in the same way as on the 4A-F/E engine.

Removal and installation

Although the work was described during engine disassembly, it should be described additionally for the case when only the toothed belt needs to be replaced. The drawings associated with the description have already been given on the previous pages. The general appearance of the mechanism drive is given here.

• Disconnect the battery and drain the coolant.
• Release the alternator mounting bracket, tilt the alternator and remove the drive belt. Remove the alternator.
• After disconnecting the spark plug caps, unscrew the spark plugs using an extended spark plug wrench.
• Unscrew the 4 cylinder head cover nuts and crush the cover with sealing washers and cover gasket.
• Turn the crankshaft until the mark on the crankshaft pulley aligns with the "0" mark on the ignition timing scale on the front of the engine (see fig. 7). Check that the valves of the first cylinder have clearances. If they are in the switching position, turn the crankshaft one more revolution. To avoid mistakes, watch the camshaft gear. There is a hole on the gear that should be opposite the mark on the camshaft bearing cap, as shown in Figure 26.
• Loosen the belt pulley bolt (hold the flywheel so that the crankshaft cannot turn) and remove the pulley. To press the pulley, you can install the pry bars on opposite sides. Otherwise, use a puller, as shown in Fig. 8. Two threaded holes allow you to install the puller on the pulley.
• Unscrew the upper and lower toothed belt covers and remove the gaskets. Unscrew 5 bolts of the upper cover and 4 bolts of the lower cover.
• Remove the timing belt guide wheel (Fig. 9).
• If the timing belt is to be reinstalled, mark the belt direction arrow and the mark on the belt in relation to the camshaft sprocket and the crankshaft sprocket as shown in Figures 27 and 28.
• Loosen the toothed belt tensioner bolt at the front of the engine, press the tensioner to the left with the screwdriver as shown in Figure 11, and tighten it in the new position. The toothed belt is now free and can be crushed. If desired, the belt tension roller can be removed.
• Remove the toothed wheel from the crankshaft. If necessary, use two powerful screwdrivers or pry bars, as shown in Figure 29. However, you should put a rag underneath to avoid damaging other parts.
• Loosen the camshaft wheel bolt. Since the shaft rotates, it should be held. Usually, the tool shown in Figure 30 is used for this, which is inserted into two holes in the wheel, but you can also insert a long rod into one of the holes, turn the wheel until the rod touches the cylinder head and then loosen the bolt. Remove the washer and pull off the toothed wheel.
• If necessary, remove the oil pump drive gear. It can be held from turning in the same way as shown for the camshaft gear in Figure 30.
• The timing belt and other parts are checked in the same way as on the other engine. The timing belt installation was described above.

The original source is located on the website (ToyotaMan.ru)