Removing, checking and installing the timing belt

Withdrawal

Loosen the coolant pump pulley bolts.

Loosen the alternator mounting bolt.

Remove the coolant pump pulley and alternator drive belt.

Remove the crankshaft pulley.



Remove the timing belt cover (pic. 2.56).

Move the tensioner towards the coolant pump and temporarily tighten the mounting bolts so that the tensioner does not come back.

Loosen the camshaft sprocket bolt.

Remove the camshaft sprocket.

Remove the timing belt.

Note. If the timing belt is reused, it must be chalked on the back (non-working) belt surface an arrow indicating the direction of rotation (or crankshaft pulley location), so that when installing the belt, do not confuse the direction of its rotation (pic. 2.57).

Loosen the crankshaft sprocket bolts. Remove the sprocket and guide washer from the crankshaft.

Remove the timing belt tensioner.

Checking the sprocket, timing belt tensioner pulley and idler pulley

Check the camshaft sprocket, crankshaft sprocket, timing belt tensioner pulley and idler pulley for excessive wear, cracks or damage.

Replace them if necessary.



Check the ease and smoothness of rotation of the timing belt tensioner pulley and idler pulley and make sure that there is no excessive play and extraneous noise during rotation (pic. 2.58).

Replace roller if necessary.

Replace the roller if traces of lubricant leakage from its bearing are found.

Check the belt for dirt or oil deposits. Replace belt if necessary. Light dirt on the belt can be removed with a dry cloth or tissue paper. Do not use solvents for these purposes.




When overhauling the engine or adjusting the belt tension, carefully inspect the belt. If any of the defects listed below are found, replace the belt with a new one (pic. 2.59).

Note. A normal belt should have sharply pointed sides, similar to knife-cut surfaces.

Installation

Install the guide washer and crankshaft sprocket as shown (pic. 2.60).

Pay attention to the orientation of the parts when installing.

The moment of an inhaling of a bolt of fastening of an asterisk of a cranked shaft: 140–150 Н·м.




Install the camshaft sprocket, tighten its fastening bolt to the nominal torque (pic. 2.61).

The moment of an inhaling of a bolt of fastening of an asterisk of a camshaft: 80–100 Н·м.

Install the guide roller and tighten its fastening bolt to the nominal torque.

The moment of an inhaling of a bolt of fastening of a directing roller: 43–55 Н·м.

Align the crankshaft and camshaft sprocket marks with the alignment marks when the #1 cylinder piston is at TDC on the compression stroke.



Install the timing belt tensioner parts in the following order: tensioner, spring and tensioner spacer. Temporarily tighten the tensioner pivot bolt. Temporarily tighten tensioner adjusting bolt with washer (in the longitudinal hole of the tensioner bracket). Hook the lower end of the spring to the protrusion on the oil pump housing as shown in the figure (pic. 2.62).

Move the tensioner pulley towards the coolant pump, temporarily tighten the tensioner mounting bolts.

Slide the timing belt onto the crankshaft sprocket.




Slide the timing belt onto the camshaft sprocket. After that, make sure that the working branch of the belt is taut. Then apply force in the reverse direction of rotation (counterclock-wise) to the camshaft sprocket to tighten the working branch of the belt, and make sure that all the alignment marks are aligned (pic. 2.63).

Tighten the tensioner adjusting bolt first, then the tensioner pivot bolt.

Tightening torque of the tensioner mounting bolt: 20–27 Nm.

Rotate the crankshaft one revolution in the normal direction of rotation (clockwise) and again align the crankshaft mark with the alignment mark (cylinder #1 at TDC on the compression stroke).



Check the timing belt tension again. Lock the tensioner and timing belt together with your hand, then press lightly with your thumb (with a force of approximately 49 N) in a horizontal direction on the belt opposite the center of the tensioner pulley (pic. 2.64).

Check that the top of the timing belt tooth is deflected by about 1/4 of the width of the tensioner adjusting bolt head (relative to the face of the bolt head).

Install the timing belt cover.

Tightening torque of the timing belt cover bolts: 8–10 Nm.

Install the crankshaft pulley. Make sure the crankshaft sprocket drive pin fits into the small hole in the crankshaft pulley.

The moment of an inhaling of bolts of fastening of a pulley of a cranked shaft: 140–150 Nm.

Install the water pump pulley.



Install the alternator drive belt and adjust its tension (pic. 2.65).