New Holland 667TA/EBF, Руководство по ремонту, Страница: 127 / 150

2-109
87519804 NA Issued 11-06 Bur
CHAPTER 2 - 667TA ENGINE OVERHAUL
ENGINE REPAIR MANUAL
VALVE CLEANING, CHECK AND GRINDING
STEP 130
BS06K359
Figure 2-232
Remove the carbon deposits from the valves by
means of a special metal brush.
Verify that the valves do not show traces of seizing,
scoring or cracking.
Reface if necessary the valve seats by grinding,
removing as little material as possible.
STEP 131
BS06K360
Figure 2-233
Use a micrometer (2) to measure valve stem (1),
which must be equal to 6.97 to 6.99mm
(0.2744 to 0.2751 in.)
CHECKING ASSEMBLY PLAY, AND VALVE
CENTERING
STEP 132
BS06K361 Figure 2-234
Use a magnetic comparator (1) placed as shown.
Assembly play must be equal to 0.039 to 0.079 mm
(0.0015 to 0.0031 in.)
Turn valve (2) and check that the centering error is
not exceeding 0.03 mm (0.0011 in.)
VALVE GUIDE
STEP 133
BS06K362
Figure 2-235
Use a bore gauge to measure the valve guide inner
diameter, which must be equal to 7.042 to 7.062 mm
(0.2772 to 0.2780 in.)
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1