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12.7 Replacing a crank / Crank bearing
Replacing a crank is necessary if the crank is cracked or if the nuts
(1)
of the drive rod come undone
regularly. Then the crank bearings, the crank bearing holes or the big-end pinholes in the crank are
damaged. To prevent further damage to other parts, as soon as possible replace the crank / bearing
as follows (see Figure 17):
1. Remove the big-end nut
(1)
and the big-end pin
(4)
.
2. Remove the drive rod
(3)
.
3. Remove the bolts and nuts
(5)
and the closing plates
(6)
.
4. Remove the crank
(2)
.
5. Check the bearing and if necessary, remove the bearing
(7)
.
6. Replace the faulty parts and assemble in the reverse order.
Use Loctite 270 for nuts 1.
For tightening moments, see Section 12.9.
For the correct assembly, support the middle of the drive rod (8) using a wooden block
when tightening the big-end nut (1) (see Figure 17).
12.8 Eliminating crankshaft tensions
If parts in the crankshaft are replaced, the crankshaft can run heavier. Pre-tension can be the cause. It
is necessary to eliminate these tensions as follows:
1. Check which crank (2) runs heavier and causes tension.
2. Using a hammer, beat on the specific cranks besides the big-end nut that causes the
tension in order to eliminate this tension (see Figure 17).
3. Check each crank
(2)
for tension until the tension is eliminated in all elements.
To prevent damaging the crankshaft, do NOT start working with the machine before all
pre-tension is removed from the crankshaft.
After repairing the crankshaft, you must regularly check whether nuts come undone.
Assemble the cranks in the correct manner. See the Parts page for the correct order
and part numbers.
12.9 Timing and tightening moments
Figure 18 shows the tightening moments of the most important bolts and nuts. Make sure that the
tightening moments of bolts and nuts for which the settings are not listed are the same as the
tightening moments of comparable bolts and nuts. If bolts and nuts come undone, Loctite may be used
to tighten them.
Because the timing of the machine is symmetrical, only two different cranks are used. The crank in the
middle divides the machine in two in which each of the two halves has its own type of crank element.
At the end, the crankshaft has the same end-crank. Consult the Parts manual to mount the crankshaft
correctly. This way, the timing of the crankshaft will always be correct.
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