Mercury Optimax 115 Service Manual page 277

POWERHEAD
Powerhead Installation on Driveshaft Housing
1. Install Lifting Eye (91-90455) into flywheel.
BE SURE that Lifting Eye is threaded into flywheel as far as possible BEFORE lift-
ing powerhead.
2. Using a hoist, lift powerhead high enough to allow removal of powerhead from repair
stand. Remove powerhead from repair stand, being careful not to damage drive shaft
housing gasket surface of powerhead.
3. Place a new gasket around powerhead studs and into position on base of powerhead.
IMPORTANT: DO NOT apply lubricant to top of driveshaft as this will prevent drive-
shaft from fully engaging into crankshaft.
4. Apply a small amount of 2-4-Cw/Teflon Marine Lubricant (92-90018A12) onto drive-
shaft splines.
5. Use hoist to lower powerhead onto driveshaft housing. It may be necessary to turn
flywheel (aligning crankshaft splines with driveshaft splines) so that powerhead will
be fully installed.
6. Install 10 flat washers and10 locknuts which secure powerhead to exhaust extension
plate/driveshaft housing. Torque locknuts in 3 progressive steps until secured.
7. Disconnect hoist from Lifting Eye and remove Lifting Eye from flywheel.
8. Reinstall plastic cap into center of flywheel cover.
a -
b -
9. Install fuel cooler inlet and outlet water hoses to fittings on exhaust adaptor plate and
poppet valve cover. Install air hose from port fuel rail to fitting on exhaust adaptor
plate. Secure all hoses with sta-straps.
Page 4A-54
a
56162
Lifting Eye (91-90455)
Powerhead Attaching Locknuts and Flat Washers – Torque Nuts to 20 lb. ft.
(27 N·m)
WARNING
b
90-855347R1 JANUARY 1999
b
51846