TOHATSU MFS 4 Service Manual page 216

1. Specification • Service Data
3.Maintenance Data
art name
Carbon deposition on combustion chamber wall
Deformation of mating faces and flaws
Cylinder head
Corrosion of mating faces
lugging of cooling water passages
Deposition on water jacket interior walls
Wear of bore : Measure bore by using
Seizure, cylinder liner damage, or wear
Cylinder Taper
Out-of roundness
Deformation and damage of cylinder head mating faces
Outer diameter
Carbon deposition on piston crown and in ring grooves
iston
Flaws on sliding faces
Measure side clearance between piston
ring and ring groove.
Measure piston pin bore.
iston pin clearance
iston pin Outer diameter
Ring end gap
iston rings
Small end bore
Big end oil clearance
Connecting rod
Big end side clearance
Crank pin outer diameter
Crankshaft Crankshaft runout: Support crankshaft at
journals of both ends by using V block
Valve clearance
Valve stem outer diameter
Intake valve Valve guide inner diameter
Exhaust valve
Clearance between valve guide
and valve stem
Width of area contacting
with valve seat
Valve spring Free length
Cam height (both IN and EX)
Journal outer diameter
Cam shaft
Camshaft runout
Compression pressure (Reference value) with de-comp.
Engine block
at 500 r/min
11-6
Item
á Measure outer diameter at 7mm (0.28in)
above lower end of piston skirt.
á iston clearance
Note : Measure ring end gap
Top ring
Second ring
Oil ring
59.00mm (2.3228in)
58.96mm (2.3213in)
0.020
Top ring
Second ring
Oil ring
0.002
16.00mm (0.6299in)
at the top or bottom
Top ring
cylinder bore that is
Second ring
worn little if ring gauge
Oil ring
is not available.
16.01mm (0.6303in)
0.040
0.20
29.95mm (1.1791in)
To be less than
IN : Intake 0.06
EX : Exhaust 0.11
IN : Intake 5.47mm (0.2154in)
EX : Exhaust 5.44mm (0.2142in)
IN : Intake 5.50mm (0.2165in)
EX : Exhaust 5.50mm (0.2165in)
IN : Intake 0.020
EX : Exhaust 0.045
IN : Intake 0.8mm (0.0315in)
EX : Exhaust 0.8mm (0.0315in)
35.0mm (1.38in)
28.33mm (1.11547in)
Flywheel side 13.980mm (0.5504in)
0.34M a (49.3 psi) [3.5kgf/cm
without de-comp. 0.93M a (137.8 psi) [9.5kgf/cm
Standard value
Ð 0.055mm (0.00079 Ð 0.00217in)
0.04 Ð 0.08mm (0.0016 Ð
0.03 Ð 0.07mm (0.0012
0.01 Ð 0.18mm (0.0004 Ð 0.0071in)
Ð 0.012mm (0.00008 0.00047in)
∼
0.15 Ð 0.35mm (0.0059 Ð
0.30 Ð 0.50mm (0.0118
0.20 Ð 0.40mm (0.0079 Ð 0.0157in)
Ð 0.066mm (0.00157 Ð 0.00260in)
Ð 0.40mm (0.0079 Ð 0.0157in)
0.05mm (0.0020in)
Ð 0.14mm (0.0024 Ð 0.0055in)
Ð 0.19mm (0.0043 Ð 0.0075in)
Ð 0.044mm (0.00079 Ð 0.00173in)
Ð 0.072mm (0.00177 Ð 0.00283in)
2 ] ±10%
] ±10%
2
0.0031in)
Ð 0.0028in)
0.0138in)
Ð 0.0197in)
at both ends.
4st 4/5/6 2011