Mazda MX-6 1998, Workshop Manual

Page: 407 / 1282

MECHANICAL [FS]
7. Face the notch of the tappet so that a small
screwdriver can be inserted.
11. Using a fine screwdriver, pry up the adjustment
shim through the notch on the tappet. Remove the
shim by using a magnet.
8. Set the
S S T
on the tappet by its notch.
9. Tighten bolt B to secure the
S S T
(body). 12. Select proper adjustment shim.
N e w a d ju s tm e n t sh im
= R e m o v e d s h im th ic k n e s s + M e a s u re d
v a lv e c le a ra n c e - S ta n d a rd v a lv e c le a ra n c e
(0 .2 6 m m {0 .0 1 0 in})
13. Push the selected shim into the tappet.
14. Loosen bolt C to allow the tappet to move up.
15. Loosen bolt B and remove the
S S T
(body).
16. Remove the
S STs
and tighten the camshaft cap
bolts.
T ig h te n in g to rq u e
11.3— 14.2 N m
(1 1 5 — 145 k g fc m , 1 0 0 — 1 2 5 in-lbf}
17. Verify the valve clearance. (Refer to 01-10A
VALVE CLEARANCE INSPECTION [FS].)
COMPRESSION INSPECTION [FS]
Warning
•
When the engine and the oil are hot, they
can badly burn. Be careful not to burn
yourself during removal/installation of
each component.
1. Verify that the battery is fully charged. Charge it
again as necessary. (Refer to 0 1 -1 7 BATTERY
INSPECTION.)
2. W a rm up th e e n g in e to th e n o rm a l o p e ra tin g
te m p e ra tu re .
3.
Stop the engine and allow it to cool off for about
10 minutes.
4.
Perform “Fuel Line Safety Procedures”. Leave the
fuel pump relay removed. (Refer to 01-14
BEFORE REPAIR PROCEDURE.)
5. Remove the spark plugs.
6. Disconnect the ignition coil connector.
7. C o n n e c t a c o m p re s s io n g a u g e into th e No.1 s p a rk
plug hole.
8. Fully depress the accelerator pedal and crank the
engine.
9.
Record the maximum gauge reading.
10. Inspect each cylinder as above.
C o m p re s s io n
W 6 U 1 1 0 W 0 5
kPa {kgf/cm2, psi} [rpm]
Item
Engine
FS
Standard 1,177{12.0, 171} [300]
Minimum 824 {8.4, 119} [300]
Maximum difference
between cylinders
196 kPa (2.0 kgf/cm2, 28 psi}
11. If the compression in one or more cylinders is low
or the compression difference between cylinders
exceeds the maximum, pour a small amount of
clean engine oil into the cylinder and check the
compression again.
(1) If the compression increases, the piston, the
piston rings, or cylinder wall may be worn and
overhaul is required.
(2) If the compression stays low, a valve may be
stuck or improperly seated and overhaul is
required.
(3) If the compression in adjacent cylinders stays
low, the cylinder head gasket may be
damaged or the cylinder head is distorted and
overhaul is required.
12. Disconnect the compression gauge.
NOTCH
W6U110WAC
SCREWDRIVER
W 6 U 1 1 0 W A E
49 T012 003
C a u tio n
• C y lin d e r h e a d c a n b e d a m a g e d w h e n th e
ta p p e t is p re s s e d d o w n .
10. Tighten bolt
CAM
SHIM
TAPPET
C, and press down the tappet.
W 6 U 1 1 0 W A D
0 1 -1 0 A -4