Lada Niva Manual - Maintenance
Page 4
VALVE GEAR
Valve Clearances
Every 10.000 Km and also in case of abnormal knocking in
the valve mechanism, check clearances A (Fig. 29) between the
cams and valve rockers which should be 0.15 mm on a cold
engine both for the intake and exhaust valves. On a new engine
perform this operation after the first 2,000-3,000 Km upon
checking and tightening the fasteners of the cylinder head,
camshaft bearing housing and intake and exhaust manifolds.
Loosen the cylinder head bolts preliminarily through about
30" each and then tighten them according to the sequence
shown in fig. 30.
Tighten bolts 1 through 10 to a torque of 115 N·m (11.5 kg · m),
and bolt 11 to a torque of 38 N·m (3.8 kg · m).
Valve Gear
A - Valve rocker to cam clearance 1 -
cam, 2 - valve rocker, 3 - valve oil
deflecting cap, 4 - valve, 5 - rocker
adjusting bolt, 6 - adjust bolt locknut.
Figure 30
- Sequence of tightening
cylinder head bolts
Tighten the nuts of the camshaft
bearing housing by applying a torque
of 22 N·m (2.2 kg m) according to
the sequence shown in pig. 31.
Fig 31.
Sequence of tightening
camshaft bearing housing nuts
To adjust the valve clearances, proceed as follows:
•
Remove the cylinder head cover with its gasket; if necessary,
first remove the heater air intake box;
Fig 32.
Setting No. 4 Cylinder piston in TDC
Fig 33.
Adjusting valve clearances: 1-
adjusting bolt, 2- adjusting bolt
locknut
•
Rotate the crankshaft clockwise to align mark A (Fig. 32) on
the sprocket with mark B on the camshaft housing; in this case
the piston of the No. 4 cylinder will be on TDC at the end of
the compression stroke, and both valves will be closed
•
Adjust the rocker-to-cam clearances of the exhaust valve on
the No. 4 cylinder (8th cam) and of the intake valve on the No.
3 cylinder (6th cam); for this purpose, loosen locknut 2 (Fig.
33) and rotate adjusting bolt 1 to set the required clearance,
using a flat feeler gauge inserted between the cam and the
rocker (the feeler gauge should move in this case with a slight
biting)
•
Holding bolt 1 in this position with a wrench, tighten locknut
2 by applying a torque of 52 N·m (5.2 kg · m) and recheck the
clearance
•
Turning the crankshaft each time through hall a revolution,
adjust the clearances of other valves, following the sequence
given in Table 3 below.
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