Inspection I Repair; Preparation; Cylinder Head - Mazda MX-5 1990 Workshop Manual

B
INSPECTION I REPAIR
PREPARATION
SST
49 8012 005
Remover &
installer, valve
guide
49 L012 002
a:JiJ
Body
(Part of
49 L012 OAO)
49 L012 004
i)
Nut
(Part of
49 L012 OAO)
, INSPECTION I REPAIR
r
For removal of 49 L012 OAO
,
For installation of
valve guide
~~~
valve guide
Installer set,
valve seal
&
~®® ~
valve guide
For installation of 49 L012 003
,
For installation of
valve guide valve guide
Installer
(Part of
49 L012 OAO)
05UOBX-118
For installation of
valve guide
1 , Clean all parts, being sure to remove all gasket fragments, dirt, oil or grease, carbon, moisture residue,
and other foreign materials,
2, Inspection and repairs must be performed in the order specified,
Caution
• Do not damage the joints or friction surfaces of aluminum alloy components (such as the cyl-
inder head or pistons).
05UOBX-121
8-48
05UOBX-119
CYLINDER HEAD
1, Inspect the cylinder head for damage, cracks, and leakage
of water and oil. Replace the cylinder head if necessary,
2, Measure the cylinder head distortion in the six directions
shown in the figure.
Distortion: 0.15mm (0.006 in) max.
Caution
• Before grinding the cylinder head, check the follow-
ing and repair or replace the cylinder head as
necessary.
Sinking of valve seats
Damage of manifold contact surface
Camshaft oil clearances and end play
3. If the cylinder head distortion exceeds specification, grind
the cylinder head surface.
If the cylinder head height is not within specification, replace
it.
Height: 133.8-134.0mm (5.268-5.276 in)
Grinding: O.20mm (0.008 in) max.