Defender. Manual — part 76
Item
Part Number
Description
1
-
Plunger cap
2
-
Hydraulic lash adjuster body
3
-
Oil hole
4
-
Reservoir chamber
5
-
Plunger
6
-
Check ball
7
-
High-pressure chamber
8
-
Plunger spring
9
-
Hydraulic lash adjuster
10
-
Rocker arms
The body of the hydraulic lash adjuster contains a plunger and 2 chambers for oil feed and pressurised oil. The
pressurised oil is supplied to the adjusters via the main oil galleries in the cylinder head and through a hole in the side
of the adjuster body. The oil passes into a feed chamber in the adjuster and then through to a separate pressure
chamber via a 1-way ball valve.
Oil flow from the pressure chamber is determined by the amount of clearance between the adjuster outer body and the
centre plunger. Oil escapes up the side of the plunger every time the adjuster is operated, the downward pressure on
the plunger forcing a corresponding amount of oil in the adjuster body to be displaced. When the downward pressure
from the camshaft and finger rocker is removed (i.e. after the trailing flank of the camshaft lobe has passed), oil
pressure forces the adjuster's plunger up again. This pressure is not sufficient to effect the valve operation, but
eliminates the clearance between the finger rocker and top of the valve stem.
Camshaft Position (CMP) Sensor
Item
Part Number
Description
1
-
Bolt
2
-
CMP sensor
The CMP sensor is located on the LH side of the cylinder head towards the rear. The sensor tip protrudes through the
cylinder head to pick up on the reluctor on the inlet camshaft. The sensor is a Hall effect type sensor.
The ECM uses the CMP sensor signal to determine the engine position. Once this has been established, the ECM can
then operate the correct injector to inject fuel into the cylinder when the piston is at injection Top Dead Centre (TDC).
The CMP sensor is used by the ECM at engine start-up to synchronize the ECM with the CKP sensor signal. The ECM
does this by using the CMP sensor signal to identify number 1 cylinder to ensure the correct injector timing. Once the
ECM has established the injector timing, the CMP sensor signal is no longer used.
For additional information, refer to:
Electronic Engine Controls
(303-14 Electronic Engine Controls - 2.4L Duratorq-TDCi
HPCR (103kW/140PS) - Puma, Description and Operation).
Camshaft Cover and Engine Cover
Item
Part Number
Description
1
-
Engine cover
2
-
Camshaft cover
LUBRICATION SYSTEM
The main lubrication system components are:
Turbocharger oil return
Oil pick-up
Oil pump
Oil filter and cooler assembly
Oil pressure switch
Oil level gage
Turbocharger Oil Return
Item
Part Number
Description
1
-
Turbocharger assembly
2
-
Turbocharger oil feed pipe
3
-
Turbocharger oil return pipe
A tapping at the front RH side of the cylinder block, behind the generator mounting bracket, connects a pipe to the
turbocharger by means of a banjo connection. Oil is supplied, under pressure via this tapping, from the oil pump to
provide lubrication for the turbocharger bearings.
A port is included at the LH side of the ladder frame, below the turbocharger, to connect the turbocharger oil return pipe
to the sump.
Oil Pick-up
Нет комментариевНе стесняйтесь поделиться с нами вашим ценным мнением.
Текст