Table of Contents
Advertisement
1
2
A
128
A
129
130
Workshop Manual KD 441_cod. 1.5302.865_2
Oil seals, crankshaft - Replacement
It is possible to replace the oil seal rings if the crankshaft is assem-
bled by following the instructions below.
3
Caution – Warning
A warped oil seals may allow the introduction of air into the engine
thus causing crankcase ventilation problems.
Use genuine oil seals.
Oil seal rings 1 and 2 are inserted in the timing cover side while ring 3
in the crankcase flywheel side.
A
Arrows A show the crankshaft rotation direction.
Drive the rings into their seats with a buffer exercising a uniform pres-
sure on the whole front surface, after lubricating them generously.
Assessing head gasket thickness
A = Clearance
C
C = Head gasket
The thickness of gasket C determines the clearance A, which must
be 0.45÷0.50 mm.
For the correct thickness of gasket C see table "Head gasket"on page
47.
Piston protrusion check
To calculate the right thickness for the gasket, the protrusion between
the piston and the cylinder head surface must be measured.
Lock the cylinder with spacers 1.
Use a dial indicator with base plate. Reset to zero while resting on a
1
surface plate, then position against the cylinder head base plane as
shown in the diagram, so that the dial indicator rod rests against the
piston. Now take the reading.
Repeat the operation in the other three points (going crosswise) and
take the readings. Calculate the average of these four readings to get
the precise measurement of the protrusion between the piston and
the cylinder head base plane.
Choose the appropriate gasket according to the following table.
nd
ed_ rev. 01.
Head gasket (mm)
Piston
Gasket
protusion
Thickness
0.250÷0.300
0.70
0.301÷0.350
0.75
0.351÷0.400
0.80
0.401÷0.450
0.85
0.451÷0.500
0.90
0.501÷0.550
0.95
0.551÷0.600
1.00
0.601÷0.650
1.05
0.651÷0.700
1.10
0.701÷0.750
1.15
0.751÷0.800
1.20
0.801÷0.850
1.25
6
Reassembly
- 55 -
Advertisement
Table of Contents
