Checking And Overhauling The Valves - Kohler Lombardini LDW FOCS 502 Euro 2 Service Manual

6.3.5 Checking and overhaulimg the valves
In order to carry out a control of the valves, it is
necessary to remove them from the cylinder head. See
"Disassembling the valves" for the correct procedure.
1. Use a gauge to measure the length of the springs (see
"Table of dimensions for springs – valve stems –
valve guides").
Table of dimensions for springs - valve stems -
valve guides
Table of dimensions for springs - valve stems -
valve guides
Dimensions
Réf.
(mm)
Ø x 7,005÷7,020
Ø y
6,960÷6,990
Z 43,5÷46,0
W
0,5÷0,8
J 1,6÷1,7
If the length does not correspond to the value shown,
replace the springs with original spares.
2. Use a micrometer to measure the diameters of the
valve stems and guides (see "Table of dimensions for
springs – valve stems – valve guides"). If the diameters
do not correspond to the values show, replace the
valves and guides with original spares.
Important
• Take measurements in several places in order to
discover possible ovalization and/or wear.
3. Thoroughly clean the valves and their seats.
4. Measure the width of the seal for each valve (J) and
the indentation (W) from the flat part of the cylinder
head (see "Table of dimensions for springs – valve
stems – valve guides"). If the dimensions do not
correspond to the values shown, replace the valve
seat ring with an original spare.
5. Use a pointed tool to take out the valve seats.
6. Remove any debris, clean the valve seat holder carefully
and scrape the mouth.
7. Lubricate the new valve seats and put them into the
holder manually.
8. Use the special tool to put the valve seats in the holder.
9. Slide the valves into their seats.
10. Measure the degree of indentation of each valve
from the flat part of the cylinder head (see "Table of
dimensions for springs – valve stems – valve guides").
Se le dimensioni rilevate corrispondono ai valori
indicati, smerigliare ogni valvola nella propria sede.
Important
Protect the contact surfaces with lubricant oil, to prevent
them from rusting.
11. Assemble the valves (see "Assembling the flywheel").
Service Manual LDW FOCS 502 automotive _ cod. ED0053027270 - 3° ed_rev. 02
Wear and
Clearance
tear limit
(mm)
(mm)
0,10
Ø b - Ø c =
0,050÷0,005
1,10
2,00
OVERHAULS AND TUNING
valve guide
69
valve guide
valve seat
70
6
valve
guide
53