WATERAX
MARK-3 Owner's Manual
03/2016
– Page 40 of 52
7. Measure the thickness of ball bearing R-343. Call this dimension (E) (see image).
8. Measure the thickness of crankshaft spacer R-334. Call this dimension (F) (see image).
9. Measure the width of the crankshaft between both bearing thrust surfaces. Call this dimension (G)
(see image).
10. Add (D) + (E) + (F) + (G). Call this dimension (H).
11. Subtract (C)
– (H) and call this dimension (I). The dimension (I) is total thickness of shims to be
installed. Note
: The acceptable axial clearance is between .0079” (0.2 mm) and .0118” (0.3 mm). The
axial clearance will be given by the crankcase gasket thickness in a compressed (installed) condition;
that said thickness is .0098” (0.25 mm).
12. Apply a small amount of high-temperature anti-seize (Copaslip or Loctite) on both crankshaft bearing
seats to facilitate installation of ball bearings.
13. Put the spacer R-334 on the crankshaft (pump side).
14. Press the ball bearing R-333 on the crankshaft (pump side) using a pressing tool. Important: use the
crankshaft jack R-953 to prevent damaging the crankshaft.
15. Slide the shims on the crankshaft magneto side (fan), starting with the thinnest shim and finishing
with the thickest shim.
Note: The crankshaft used in the electronic ignition units does not have a lobe ground into the
crankshaft end.
16. Press the ball bearing R-343 on the crankshaft (magneto side) using a pressing tool. Important: use
the crankshaft jack R-953 to prevent damaging the crankshaft.
17. Install the dowel tubes on the crankcase, pump side.
18. Heat the crankcase to a temperature of 120 °C (248 °F). The use of an oven is recommended for a
controlled and uniform temperature.
19. Starting with the crankcase pump side half, apply a small amount of 15W40 engine oil on the
crankcase seal seat.
20. Install the new oil seal R-123 on the coupling side (pump side). The oil seal must be installed from the
inside to the outside with the closed side facing the exterior of the crankcase.
21. Grease the oil seal inside lip to facilitate insertion of the shaft. Use standard multipurpose grease.
22. Slide the crankshaft pump side in the crankcase half pump side. Be careful to prevent damage to the
oil seal lip. Important: the crankshaft should slide right in without any resistance. Light pressing may
be needed; use the crankshaft jack R-953 to prevent damaging the crankshaft.
Important: ensure that the rotating part of the bearings do not come into contact with the
seals.
23. Apply a small amount of multipurpose grease on both sides of the new crankcase gasket and
carefully install on the crankcase pump side.
24. Apply a small amount of 15W40 engine oil on the crankcase seal seat and install the new oil seal R-
342 on the magneto side (fan side). The oil seal must be installed from the inside to the outside with
the closed side facing the exterior of the crankcase.
25. Grease the oil seal inside lip to facilitate insertion of the shaft. Use standard multipurpose grease.
26. Slide the crankcase magneto side on the crankshaft. Align the dowel tubes and verify that the
connecting rod is not in the way during the installation. Important: the crankcase should slide right in
without any resistance. Light pressing may be needed; use the crankshaft jack R-953.
27. Reassemble crankcase screws and lock washers. Apply Loctite 243 on the crankcase screws and
tighten screws uniformly to 10 Nm [90 inch-lbs].
28. For stress relief, tap the crankshaft on both sides with a soft head hammer. Careful not to damage the
threads. Important: the shaft should turn freely by hand.
