Rotax 912-UL Repair Manual page 53

7) Main assembly of engine
gauge.
Dimension
axial clearance of crankshaft
Always pay special attention to absolute cleanness. Any foreign matter and smallest metallic particle
in the oil circuit wouldberuinous to thejournal bearings and couldcauseengine failureorconsiderable
reduction of service life.
INOTE:
All O-rings, oil seals and gaskets have to be renewed at re-assembly.
7.1,) Crankcase
After dimensions are taken and recorded, split crankcase again. Fit the right crankcase half
(cast mark 're') on trestle. Place greased thrust ring halves serving as axial crankshaft spacers
with coated side showing towards outside, into crankcase. Lubricate bearing halves and place
crankshaft ass'y fitted with timing gear into position. Turn crankshaft so that timing mark on
timing gear aligns with crankcase joint face. Check axial clearance of crankshaft, using feeler
new mm
(in) wear limit mm (in)
0,08 + O,32 (0,m3 + 0,013)
0J0
(,@0)
Oil ovemrnning gear 50 T. and bearing bush and fit on magneto end of crankshaft. Apply
MOLYKOTE GN paste to cams and lubricate bearings of camshaft. Place camshaft fitted
with timing gear, pump gear and helical gear for rev-counter (optional) in position. Ensure
proper coordination of marks on timing gears, thus marks are parallel now to joint face.
Placepre-grease.loil seal30x47 x7 ll,S,rollerbearingandretainingring
47x7,75 forprop
shaft in position. On engines with vacuum pump, fit pre-assembled drive into crankcase. Place
7 O-rings 9x2 in right crankcase half.
Now insert journal bearing halves
into the leftcrankcase half (castmark
'li') and oil slightly. Fit both dowel
pins 8x24, or starting from engine
no3,792.567, onedowel pin O 8x20
and five dowel bushes O for crank-
case alignment. Apply LOCTITE
57 4 to sealing face of left crankcase
half and join with right crankcase
half.
IATTENTION:
Keep a 3 mm (1/
8") wide strip 0 along bear-
ings free of sealing com-
pounds by reasons of pre-
venting passing into gap of
bearing halves when tight-
ening crankcase screws.
Lubricant is supplied via
bores @!
53.t"t'"n'
Rm:'912:UL