Service manual

G420F(FE) Service Manual Chapter 3. Engine Mechanical System
110
Cylinder Block
1. Remove gasket material. Using a gasket scraper,
remove all the gasket material from the top
surface of the cylinder block.
2. Clean cylinder block Using a soft brush and
solvent, thoroughly clean the cylinder block.
3. Inspect top surface of cylinder block for flatness.
Using a precision straight edge and feeler gauge,
measure the surface contacting the cylinder head
gasket for warpage.
Flatness of cylinder block gasket surface
Standard : Less than 0.03 mm (0.0012in.)
Limit : 0.05 mm (0.0020in.)
4. Inspect cylinder bore diameter Visually check the
cylinder for vertical scratchs. If deep scratches are
present, replace the cylinder block.
5. Inspect cylinder bore diameter Using a cylinder
bore gauge, measure the cylinder bore diameter
at position in the thrust and axial directions.
Standard diameter: 82.00 ~ 82.03 mm (3.2283 ~
3.2295in.)
6. Check the cylinder bore size code on the cylinder
block bottom face.
Class
Cylinder bore inner
diameter
Size
code
A
82.00~82.01mm
(3.2283~3.2287in.)
A
B
82.01~82.02mm
(3.2287~3.2291in.)
B
C
82.02~82.03mm
(3.2291~3.2295in.)
C
7. Check the piston size code (A) on the piston top
face
NOTE: Stamp the grade mark of basic diameter with
rubber stamp