Lister Petter 0600123LPW3A01, Руководство по ремонту, Страница: 30 / 88

ALPHA series engines worksHoP mAnuAL
30
34.0Nm (25.0lbf ft) and wait for the lubricating oil
to ‘bleed down’:
Up to 90 seconds on a new tappet.
Up to 45 minutes on a used tappet.
CAution
During the waiting period the crankshaft must
not be turned.
Figure 2.24.7 Valve Tappet Compressing Tool 317-50107
9. Replace the cylinder head covers and torque the
nuts to 9.0Nm (6.5lbf ft).
Extreme care must be taken to ensure the joint
is carefully aligned with the valve rocker cover,
especially where a dual cover incorporating an
oil filler is fitted.
10. Replace the lifting eye, fuel pipes and the
manifolds.
11. On LPW(S)T4 engines replace the breather
flexible pipe to the cylinder head cover.
12. If the LPW manifold heater or the LPWS glow
plugs are fitted, refer to "2.4 The Cold Start Aid",
and replace them.
2.25 tHe HydrAuLiC tAPPets
All engines are fitted with one of two types of hydraulic
tappets and both types are interchangeable.
No adjustment is necessary or possible and
removal of any part of the valve gear will allow the
hydraulic tappet to extend and hydraulically lock.
When new hydraulic tappets have been fitted the
engine must be cranked for at least 15 seconds
before attempting to start it.
Figure 2.25.1 Hydraulic Tappet - A - 751-11730
When fitting the cylinder head, valve to piston
contact can be avoided when tightening the valve
rocker lever nut by depressing the push rod end of
the rocker lever using the tappet compressing tool
317-50107.
CAution
Extreme care must be taken not to bend the push
rod by using excessive force.
If the tappet compressing tool is not available
torque the rocker lever nut to 34.0Nm (25.0lbf ft) to
open the valve and wait for up to 45 minutes for the
lubricating oil in the tappet to ‘bleed down’, and so
allow the valve to seat in the head.
CAution
No piston must be at TDC when the head is
replaced and during the ‘bleed down’ waiting
period the crankshaft must not be turned.
2.26 CyLinder HeAd CLeArAnCe
2.26.1 Checking the Clearance
wArning
Do not attempt to re-use an old head gasket.
1. Remove the cylinder head and push rods.
2. Place the gasket onto the crankcase taking care
to ensure the holes in the gasket coincide with
those in the crankcase.
3. Using two pieces of lead wire 1.6mm (0.06in)
diameter and 50mm (1.9in) long form two 'U'
shape lops.
CAution
To ensure accurate measurements are made
multicore solder must not be used.
4. Twist the open tails of the loops together to form
four or five coils.
5. Refer to 'Figure 2.16.2' and using a very small