Vaz 21213, Руководство по ремонту, Страница: 33 / 222

Drain the cooling water from the radiator and cylinder block,
remove the radiator complete with the hoses and thermostat.
Undo the retaining nuts and remove the fan.
Remove the valve cover and turn the crankshaft to align the
TDC mark in the camshaft sprocket against the timing mark in the
bearing housing (Fig.2-21), while the alternator belt pulley marks
are aligned against a long mark in the timing cover (Fig.7-18).
Undo the camshaft sprocket retaining bolt. Slacken the chain
tensioner cap nut, release the tensioner rod and fix it in position
using the cap nut. Remove the camshaft sprocket.
Slacken the alternator and remove the alternator drivebelt.
Apply the 4th gear of the gearbox, undo the nut and withdraw the
alternator drivebelt pulley from the crankshaft.
Remove the timing cover complete with the gasket. Undo the
nuts holding the cover to the cylinder block; then undo the bolts
retaining the oil sump to the cover.
Undo stop pin 6 (Fig.2-55) and withdraw the camshaft timing
chain.
The refitting procedure is a reversal of removal, observing
the recommendations outlined in section «Engine assembly».
Before refitting, smear the chain with engine oil. Always use new
gaskets for the timing cover and valve cover.
The chain refitted, adjust the chain tension and alternator dri-
vebelt tension, adjust the carburettor linkage and ignition timing.
Inspection
Camshaft. The camshaft journals must have no scores,
scuffs, scratches or aluminium galling from the bearing housing.
The maximum wear of the cam lobe surfaces is 0.5 mm, there
should be no evident scoring or cut-type wear of the cams.
Mount the crankshaft on two V-blocks, located on the test
plate and using a dial gauge, check the centre camshaft journal
endfloat to be 0.04 mm maximum. If the endfloat exceeds the
value specified, straighten the camshaft on the straightening
press.
33
Fig.2-55. Camshaft and ancillaries drive:
1 - camshaft sprocket; 2 - chain; 3 - chain damper; 4 - oil pump shaft
sprocket; 6 - stop pin; 7 - tensioner shoe; 8 - chain tensioner
Fig.2-56. Sectional view of the chain tensioner:
1 - cap nut; 2 - tensioner housing; 3 - core; 4 - spring; 5 - washer; 6 - plunger;
7 - spring; 8 - collet; 9 - spring ring;
Ä - plunger surface; Ç - centre-punch points on housing face
Fig.2-57. Basic data for checking the tensioner spring