Page 10 - E BOOK ENGINE MECHANICAL M2

1. TECHNICAL FEATURES OF 4B1 ENGINE

Auto tensioner (9) Auxiliary Drive Belt
A single serpentine belt (one piece) drive system is
used to improve quietness. The auto-tensioner is pro-
vided to make the belt tension adjustment as needed,
and to improve belt reliability.

Fig. 1-13

(10) Balancer Shaft Module Assembly (4B12 Engine
only)
The balancer shaft module assembly is located inside
the oil pan as shown in the figure 1-14. It incorporates
two counter balancer shafts.

Fig. 1-14

The balancer shaft module assembly as shown in the
figure 1-15 integrates an oil pump and a balancer unit to
realize a compact and lightweight package. The balanc-
er shaft module assembly cannot be disassembled.
The number of the balancer module sprocket teeth are
just half of the crankshaft sprocket one, so the balancer
module sprocket is driven by the crank shaft sprocket
through the balancer chain at twice the speed of the
crank shaft.

Fig. 1-15

Pub. No. PTAE1225 1 - 7