100
18-10-2004
18-10-2004
00
REG. CODE
1-5302-662
MODEL N°
51092
DATE OF ISSUE
REVISION
DATE
ENDORSED
COMPILER TECO/ATI
325
326
327
328
329
330
984620.319
985620.320
981075.424
tool 981075.424
XI
324
A
Clearance Check
Rotate the crankshaft and bring the piston to the TDC at explosion level. Using a thickness gauge, check that clearance is 0.30
mm for the intake valve and 0.40 mm for the exhaust valve, when the engine is cold (fig. 324÷325).
If clearance does not match these measurements, proceed as follows:
Turn the crankshaft backwards of about 40° (to avoid that the valves get stuck on the piston during the manual lowering phase).
Turn the tappets until the cuts “A” (fig. 329) reach the top, making removal of the collars easier.
2) Insert the tool 981075.424 (fig. 326) between the intake tappet collar and the camshaft (fig.327) and push to compress totally
the tappet. Insert the component 985620.320 (fig. 328) to keep the tappet lowered, and extract the component 981075.424 (fig.
328).
3} Disconnect the collar using a steel tip, extract it and replace it with one of a suitable size (fig. 329÷330). 28 collars from 3.25
mm to 4.60 mm are available as spare parts, as indicated in the following table.
IMPORTANT: the collar value is indicated on one of the surfaces of the collar itself, which during assembly should be facing
the tappet. Using a micrometer, check that the real thickness of the collar corresponds to the indicated value.
DISASSEMBLY/REASSEMBLY
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
Содержание LDW 422 SERIES
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