Lombardini LDA 422, Workshop Manual

Page: 70 / 86

70
REG. CODE
1-5302-596
MODEL N°
50881
DATE OF ISSUE
15-05-2003
REVISION
00
DATE
15-05-2003
ENDORSED
COMPILER TECO/ATI
273 274 275
276 277 278
984620.319
985620.320
981075.424
tool 981075.424
A
IX
Check of tappets clearance
Rotate the engine and put the piston at T.D.C. in compression stroke. With a thickness gauge check that tappets
clearance is 0.30 mm for inlet valve and 0.40 mm for the exhaust valve, with the engine cold.
If such a clearance doesn’t occur act as follows:
1) Rotate backwards the engine about 40° (to avoid the stroke of valves manual lowering and the hittling of valves against
the piston). Rotate the tappets so as to position cuts “ A ” on the upper part to make easier caps removal.
2) Insert tool 981075.424 between suction valve cap and camshaft and push so as to compress the tappet. Insert part 2 to
hold the tappet and extract part 1 .
3) Undermine the cap by using a shin point, remove it and replace with another one with a suitable dimension. As spares
28 caps from 3.25 mm. up to 4,60 mm. are pointed out on this page.
Important - The value of the cap appears on one of the surfaces of the cap itself, which on assembly must face the
tappet. Make sure that the real thickness of the cap correspond to the recommended value.
Shim thickness for tappet gap adjustment
Thickness 3,25 - 3,30 - 3,35 - 3,40 - 3,45 - 3,50 - 3,55 - 3,60 - 3,65 - 3,70 - 3,75 - 3,80 - 3,85 - 3,90 - 3,-95 - 4,00 -
4,05 - 4,10 - 4,15 - 4,20 - 4,25 - 4,30 - 4,35 - 4,40 - 4,45 - 4,50 - 4,55 - 4,60
Tolerance ± 0,015
DISASSEMBLY/REASSEMBLY