Engine Mechanical; Torque Reaction Against Timing Drive Chain Notice; Drive Belt System Description; Engine Component Description - Suzuki XL7 2007 Service Manual

Engine Mechanical

Torque Reaction Against Timing Drive Chain Notice

CAUTION
!
A wrench must be used on the hex of the camshaft when loosening or tightening in order to prevent
component damage. Failure to prevent the torque reaction against the timing drive chain can lead to
timing drive chain failure.

Drive Belt System Description

The drive belt system consists of the following
components:
• The drive belt
• The drive belt tensioner
• The drive belt idler pulley
• The crankshaft balancer pulley
• The accessory drive component mounting brackets
• The accessory drive components
– The power steering pump, if belt driven
– The generator
– The A/C compressor, if equipped
– The engine cooling fan, if belt driven
– The water pump, if belt driven
– The vacuum pump, if equipped
– The air compressor, if equipped
The drive belt system may use 1 belt or 2 belts. The
drive belt is thin so that it can bend backwards and has
several ribs to match the grooves in the pulleys. The
drive belts are made of different types of rubbers,
chloroprene or EPDM, and have different layers or plys
containing either fiber cloth or cords for reinforcement.
Both sides of the drive belt may be used to drive the
different accessory drive components. When the back
side of the drive belt is used to drive a pulley, the pulley
is smooth.
The drive belt is pulled by the crankshaft balancer pulley
across the accessory drive component pulleys. The
spring loaded drive belt tensioner keeps constant
tension on the drive belt to prevent the drive belt from
slipping. The drive belt tensioner arm will move when
loads are applied to the drive belt by the accessory drive
components and the crankshaft.
The drive belt system may have an idler pulley, which is
used to add wrap to the adjacent pulleys. Some systems
use an idler pulley in place of an accessory drive
component when the vehicle is not equipped with the
accessory.
Precautions
General Description

Engine Component Description

The High Feature V6 VIN Code 7 RPO LY7 is a 3.6L
engine incorporating two intake and two exhaust valves
per cylinder. Individual intake and exhaust camshafts
(DOHC) with camshaft position actuators are mounted
on each cylinder head. The cylinder bore is 94 mm
(3.7008 in) and the piston stroke is 85.6 mm (3.3701 in).
The cylinders are arranged in two banks of three with a
60 degree included angle. The right bank of cylinders
are number 1-3-5 and the left bank of cylinders are 2-4-
6. The engine firing order is 1-2-3-4-5-6.
Crankcase
The cylinder block is constructed of aluminum alloy by
precision sand-casting with cast in place iron cylinder
liners. Each copper-infiltrated sintered steel main
bearing cap incorporates six bolts bolting the cap into
the engine block. Along with two outer and two inner
bolts, two side bolts are used in the deep skirt block. To
prevent aeration, oil return from the valvetrain and
cylinder heads is channeled away from the rotating and
reciprocating components through oil drain back
passages incorporated into the cylinder heads and
engine block. Pressure-actuated piston oil cooling jets
are mounted between opposing cylinders. A knock
sensor is located on each side of the exterior of the
engine block. The crankshaft position sensor is located
on the right side of the exterior of the engine block.
Crankshaft
The crankshaft is a forged steel design with four main
bearings. Crankshaft thrust is controlled by the number
three main bearing. The crankshaft position reluctor
wheel is pressed onto the rear of the crankshaft in front
of the rear main journal. The crankshaft is internally
balanced with an integral oil pump drive machined into
the nose in front of the front main journal.
Engine Mechanical: 1D-1