Suzuki K6A-YH6, Technical/Repair Manual, Page: 34 / 113

4-8
THEORY OF OPERATION
4
Front Cover
See Figure 4-7.
Figure 4-7
The front cover (1) houses the crankshaft-driven oil pump
(2) and front seal (3). Attached to the bottom of the cover
is the pickup strainer (4) for the oil pump.
Timing Chain
See Figure 4-8.
Figure 4-8
For the camshaft drive, a highly durable chain drive
system is used.
Through the timing chain (1), the crankshaft rotation is
transmitted from the crankshaft timing sprocket (7) to the
camshaft timing sprockets (2 and 5) installed on the end
of the intake and exhaust camshafts.
The timing chain has aligning links (3, 4, and 8) that are
used for aligning with the timing marks on the respective
camshaft sprockets and crankshaft sprocket.
A chain guide (6) and chain tensioner (9) system are
used to ensure quiet and accurate operation.
Tension Adjuster
See Figure 4-9.
Figure 4-9
The tension adjuster (6) has a plunger (4) inside, which
pushes against the tensioner link to give proper tension.
This plunger is operated by engine oil pressure (1) as
well as spring tension (3). The plunger is designed to
travel in only one way. Once the plunger has moved
outward, it will not come back due to the function of the
ratcheting mechanism (5).
There is a check ball (2) inside the plunger (4), which
keeps hydraulic pressure from dropping. With this
provision, the plunger can resist and absorb a kickback
force. During operation under low oil pressure, the ratchet
keeps the plunger from being pushed back, allowing
tension of the chain to be maintained. The result is quiet
operation without chain flapping.
TN0749
1
4
2 3
TN0502
1
2
3 4
5
6
7
8
9
TN0503
1
2
3
4
5
6