Chrysler 2000 LHS Owner's Manual page 888

LH
DESCRIPTION AND OPERATION (Continued)
To reduce engine NVH and timing chain loads a
camshaft damper is used. This damper mounts to the
right intake camshaft sprocket. The damper utilizes
a synthetic rubber elastomer to provide damping,
similar to a crankshaft damper.
For lubrication the primary chain utilizes oil leak-
age from the front of the oil pump. This oil spills on
the crankshaft sprocket, which is then carried by the
chain throughout the primary drive.
The secondary timing chain drive system uses
two conventional roller-type chains, one at each cyl-
inder bank (Fig. 8). The purpose of the secondary
chain is to provide a mechanical driven connection
between the intake and exhaust camshafts. The
intake camshafts drive the exhaust camshafts. The
sprockets for both intake and exhaust camshafts are
a press-fit and are only serviced as an assembly with
the camshafts.
To tension the secondary chain a spring-loaded,
hydraulic tensioner is used at each bank and
attaches to each cylinder head between the intake
1 – CAMSHAFT DAMPER
2 – CHAIN GUIDE
3 – ACCESS PLUG
4 – CAMSHAFT POSITION SENSOR
5 – PRIMARY TIMING CHAIN
6 – CRANKSHAFT SPROCKET
and exhaust camshafts (Fig. 8). The tensioner incor-
porates upper and lower chain guide faces. The lower
guide face is attached directly to the tensioner's
hydraulic plunger. Also, the tensioner uses an inter-
nal oil reservoir design to prevent engine start-up
noise. The secondary chains are lubricated via an oil
passage through the upper guide face on each ten-
sioner.
CAMSHAFT
DESCRIPTION
The assembled fabricated camshafts are composed
of five bearing journals machined into a hollow steel
tube (Fig. 8). Six steel lobes, a secondary timing
drive sprocket, and a primary sprocket/thrust flange
are pressed onto the camshaft tube using a unique
assembly process. Camshaft end play is controlled by
the primary camshaft sprocket attachment flange on
the intake camshafts and by a thrust flange on the
exhaust camshafts.
Fig. 7 Timing Drive System
7 – CHAIN GUIDE
8 – CHAIN TENSIONER ARM
9 – CHAIN TENSIONER
10 – CAMSHAFT SPROCKETS
11 – CHAIN GUIDE
2.7L ENGINE 9 - 7