Engine Inspection/Repair; Cylinder Head Inspection; Valve Mechanism Inspection; Valve And Valve Guide Inspection - Mazda B-Series 1997 Workshop Manual

B1
INSPECTION I REPAIR
INSPECTION / REPAIR
PREPARATION
1. Clean all parts, being sure to remove all gasket fragments, dirt, oil, etc.
2. Perform the inspections and repairs in the order specified.
Caution
Do not damage the joints or friction surfaces of aluminum alloy components.
4BUOB1-093
CYLINDER HEAD
1. Inspect the cylinder head for damage, cracks and leakage
of water and oil. Replace if necessary.
2. Using a straightedge, measure the cylinder head distor-
tion in six directions.
Note
Before grinding the cylinder head, check the
following. Repair or replace as necessary.
(1) Sinking of valve seat.
(2) Damage of manifold contact surface.
(3) Camshaft oil clearance and end play.
3. If distortion exceeds specification, grind the cylinder head.
I
MB1215-A
Distortion:
0.08mm (0.003 in) max, per 152mm (6.0 in) and
0.15mm (0.006 in) max overall
R
STEM TIP
Grinding: 0.25mm (0.01 in)
4. Using a straightedge, measure intake and exhaust mani-
fold contact surfaces for distortion in six directions.
Distortion: 0.08mm (0.003 in)
5. If distortion exceeds specification, grind the surface or
replace the cylinder head.
VALVE MECHANISM
Valve and Valve Guide
1. Inspect each valve for the following. Replace or resurface
as necessary.
(1) Damaged or bent stem
(2) Rough or damaged face.
(3) Damaged or unevenly worn stem tip.