New Holland 667TA/EBF, Repair Manual

Page: 111 / 150

2-93
87519804 NA Issued 11-06 Bur
CHAPTER 2 - 667TA ENGINE OVERHAUL
ENGINE REPAIR MANUAL
CONDITIONS FOR CORRECT PIN/PISTON
MATCHING
STEP 72
BS06K298 Figure 2-171
Lubricate pin (1) and its respective seat on piston
hubs with engine oil. The pin must be inserted into
the piston by pressing with your fingers slightly and
must not slide out due to gravity.
PISTON RINGS
STEP 73
BS06K299
Figure 2-172
Check the thickness of seal rings (2) by means of a
micrometer (1).
STEP 74
BS06K300 Figure 2-173
Use a thickness gauge (2) to check the play between
the seal rings (3) of the 2nd and 3rd slot and the
respective seats on piston (1).
STEP 75
BS06K301
Figure 2-174
SCHEME FOR MEASURING PLAY X FOR THE TRAPEZOIDAL
RING
Due to the peculiar shape of the two trapezoidal
cross-sectioned seal ring, the play between the slot
and the ring itself must be measured as follows.
•
Allow piston (1) to protrude from the engine block
so that ring (2) protrudes out half way from the
cylinder bore (3).
•
In this position, check by means of a thickness
gauge, the play (X) between the ring and the slot.
The value must correspond to the specified value.
1
1
2
3
2
1
1
3
2