Perkins 900 Series Workshop Manual page 49

900 Series
Caution: If the brackets are not fitted correctly, the upper brackets will not be able to fit over the rocker shaft
and be aligned to the studs (E2).
5 Fit the six nuts for the rocker shaft brackets and tighten them finger tight.
Caution: When the nuts for the rocker shaft brackets are tightened to the correct torque, there will be a small
gap between the upper and lower half-brackets at the push rod end of the brackets. It is important that the nuts
are not tightened again or the tightness checked, as this could close the gap. If the gap is closed and the nuts
are tightened further, damage could occur to the upper half-bracket.
6 It is necessary to ensure that the movement of the rocker shaft is centred. To do this:
Push the rocker shaft at one end and measure the gap between the rocker lever and the rocker bracket at the
other end with feeler gauges (E1). Make a note of the measurement. Select feeler gauges equal to half of the
measurement. Put the feeler gauges between the first or the last rocker lever and the rocker bracket. Push on
the opposite end of the rocker shaft to close the gap onto the feeler gauges. Tighten the three nuts (F3) which
are toward the valves to 44 Nm (32 lbf ft) 4,5 kgf m. Tighten the three nuts (F1) which are toward the push rods
to 44 Nm (32 lbf ft) 4,5 kgf m. Remove the feeler gauges.
E
7 Release the lock nut for the adjustment screw on each rocker lever. Set the adjustment screws to the fully
out position.
8 Rotate the crankshaft in the normal direction of rotation until the camshaft is in a position where the inlet
valve of any cylinder has just opened and the exhaust valve of the same cylinder has not closed completely.
All of the tappets will now be close to their lowest position. This will enable the push rods to be fitted more
easily.
Workshop Manual, TPD 1345E, issue 3
This document has been printed from SPI². Not for Resale
1
2
F
C0035
3
1
2
3
C0025A
Continued
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