Fitting the crankpin. If the engine has covered considerable mileage prior
to dismantling, and a new crankpin is needed, the roller cage should be
replaced also. Metal or abrasive can become embedded in the soft metal
used for the cage, which with further use can cause abrasive wear. Verify
oil holes in the crankpin are clear and clean before fitting. Scribe a pencil
line (as described for timing shaft) on crankpin shank, enter the crankpin
with the line central with oil holes in timing side flywheel and tap it home.
Press the crankpin into the flywheel until it lightly abuts against the
crankpin sleeve. Fit the roller cage and fill with rollers (30) that have been
checked for uniformity in diameter.
Apply some engine oil to the con rod liner, also rollers, or a little
Molybdenum Disulphide preparation will provide immediate lubrication.
Offer up the drive side flywheel, roughly align both wheels with a straight
edge placed on the outside diameter of both wheels. Place both wheels
under an arbour press and force each flywheel firmly against the crankpin
sleeve. Run. down both crankpin nuts evenly (do not tighten one nut at
a time).
Finally tighten both nuts with a torque spanner set to 190 ft. lbs. Set
both flywheels with shaft to run true to .001" to .002" error.
Reassembling the engine. When refitting the driving side bearings heat
the crankcase, introduce the bearing 026762 squarely with the housing,
then washer 021859 followed by bearing 021872. Use a mandrel or old
drive side shaft to line up bearings, The inner member of both bearings
should rotate independently to avoid end loading. Move outer bearing to
free off.
Remove every trace of jointing compound from the crankcase joints.
also the cylinder base faces. Apply some jointing compound of the non-
flaking type, such as "Wellseal", to both crankcase faces. Use oil on the
crankcase bearings, put both cases together, pass three bolts through the
crankcase evenly spaced (as a temporary measure). Set the cylinder base
face square and even (the cylinder can be fitted temporarily for this pur-
pose) then firmly tighten the three crankcase bolts. The flywheel should
rotate by hand application freely without tight places if the flywheel shafts
are running true. Check for end float, which should be .012" minimum
between the flywheels and crankcase. Bearing 026762 is a C3 fit.
Refitting the oil pump plunger. First renew the paper gaskets on the
pump end caps, stick the gaskets to the plates with jointing compound.
Remove burrs or particles of old gasket from crankcase faces. Take up
the oil pump plunger, oil it and insert in crankcase. Clean the interior of
screwed body (6) Fig. 9, Oil and insert guide pin (5) as illustrated, the pin
should revolve freely. Fit the screwed body and pin with extreme care to
ensure the guide pin is located in the annular groove in the pump plunger,
using the finger to do so. It may be necessary to revolve the flywheels to
locate the pin. The screwed body can be finally tightened with a spanner.
"Failure to observe these important instructions can ruin the pump gear
beyond further use". Now fit the two end caps.
Fitting the camshafts. Refer to details on valve timing.
Refitting the timing gear cover. If there is evidence of oil in the contact
breaker compartment, the oil seal 024287 should be replaced. To prevent
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