Mercury 100 FourStroke, Service Manual

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90-830234R3 DECEMBER 1997 ATTACHMENTS/CONTROL LINKAGE - 7A-13
Trim Tab Installation
IMPORTANT: With dual engine installation, exist-
ing trim tabs MUST BE replaced with new trim
tabs (supplied with kit).
1. Install new trim tabs as follows:
a. Shift engine controls into neutral and turn
ignition keys to “Off” position.
b. Remove plastic cap from rear of both drive
shaft housings, loosen bolt, that secures trim
tab to gear housing, and remove both trim
tabs from gear housing.
c. Install special trim tabs (supplied with kit) to
both gear housings, using existing bolts.
Tighten bolts securely. Initial trim tab setting
should be straight to rear of engine. Replace
plastic caps on drive shaft housing.
2. Check trim tab position as follows:
a. Operate boat at normal cruise throttle setting
and adjust trim to optimum setting. Turn
steering wheel to left and right, noting in
which direction wheel turns more easily.
b. If wheel turns more easily to left, then the trail-
ing edge of trim tab must be turned to left
(when viewing motor from behind). Reverse
procedure if boat turns more easily to right.
Trim Tab Adjustment
1. Shift engine controls into neutral and turn ignition
keys to “Off” position.
IMPORTANT: Trim tabs MUST BE set in the same
position on both engines.
2. Remove plastic cap from rear of drive shaft hous-
ing and loosen bolt and trim tab.
3. Position trailing edge of trim tab to left (viewing
motor from behind), if steering wheel turns more
easily to left. Position trailing edge of trim tab to
right (viewing motor from behind), if steering
wheel turns more easily to right.
4. Tighten both trim tab bolts securely and replace
plastic caps.
5. Operate boat per “Check trim tab position as fol-
lows,” preceding, to check trim tab setting. Read-
just trim tabs, if necessary.
Maintenance Instructions
Maintenance inspection is owner’s responsibility and
must be performed at intervals specified, following:
Normal Service – Every 50 hrs. of operation or 60
days (whichever comes first)
*Severe Service– Every 25 hrs. of operation or 30
days (whichever comes first)
* Operation in a salt water area is considered “Severe Service.”
1. Carefully check steering system components for
wear. Replace worn parts.
2. Check steering system fasteners to be sure that
they are torqued to correct specifications.
NOTE: Ride-Guide steering cables are lubricated at
the factory and require no additional lubrication at ini-
tial installation.
WARNING
Core of each steering cable (transom end) must
be fully retracted into cable housing before lubri-
cating cable. If cable is lubricated while ex-
tended, hydraulic lock of cable could occur.
3. With core of Ride-Guide steering cables (tran-
som end) fully retracted, lubricate transom end of
steering cables thru grease fittings (Figure 12)
with Quicksilver 2-4-C w/Teflon. Lubricate ex-
posed portion of cable end with 2-4-C w/Teflon.
4. Lubricate pivot points and ball joints in link rods
and coupler steering eyes with 2-4-C w/Teflon.
5. Inspection and lubrication of steering head as-
sembly (rotary or straight rack) should be per-
formed once each year (by your Authorized
Dealer) or whenever steering mount and/or
steering head are disassembled, or if steering ef-
fort has increased. Lubricate with Quicksilver
2-4-C w/Teflon.
WARNING
When 2 couplers are connected together with
coupler link rod, a lockwasher must be used on
each side of coupler link rod, and link rod must
be torqued to 20 lbs. ft. (27.0 N·m) into end of each
coupler.