MAINTENANCE - 1B - 5
90-816462 2-695
4 Cylinder
20-Hour Break-In Period
IMPORTANT: The first 20 hours of operation is the
engine break-in period. Correct break-in is essen-
tial to obtain minimum oil consumption and maxi-
mum engine performance. During this break-in
period, the following rules must be observed:
•
Do not operate below 1500 RPM for extended pe-
riods of time for first 10 hours. Shift into gear as
soon as possible after starting and advance
throttle above 1500 RPM if conditions permit safe
operation.
•
Do not operate at one speed consistently for ex-
tended periods.
•
Do not exceed 3/4 throttle during first 10 hours.
During next 10 hours, occasional operation at full
throttle is permissible (5 minutes at a time maxi-
mum).
•
Avoid full throttle acceleration from idle speed.
•
Do not operate at full throttle until engine reaches
normal operating temperature.
•
Frequently check crankcase oil level. Add oil if
needed. It is normal for oil consumption to be high
during break-in period.
•
After 20-hour break-in period, drain crankcase oil
and replace oil filter (see “Maintenance”). Fill
crankcase with correct oil (see “Specifications”).
After 20 Hour Break-In Period
To help extend the life of your MerCruiser power
package, the following recommendations should be
considered:
•
Use a propeller that allows the engine to operate at
or near the top of the maximum RPM range (See
Specifications) when at full throttle with a normal
boat load.
•
Operation at 3/4 throttle setting or lower is recom-
mended. Refrain from prolonged operation at
maximum (full throttle) RPM.
20-Hour Checkup
After first 20 hours of operation, an Authorized Mer-
Cruiser Dealer should be contacted for the following
maintenance. The boat owner is responsible for any
charges.
•
Change crankcase oil and filter.
•
Check all fluid levels.
•
Cooling Systems - Inspect all hoses for damage
and deterioration; check all hose clamps for ade-
quate tightness.
•
Check carburetor adjustment.
•
Inspect ignition system and timing.
•
Check for loose, missing or damaged parts.
•
Check shift and throttle cable adjustments - Lubri-
cate and inspect for loose, damaged or missing
parts.
•
Steering System - Lubricate and inspect for loose,
damaged or missing parts.
•
Inspect all drive belts.
•
Check engine alignment.
•
Complete Engine Exhaust System - Inspect exter-
nally for damage and deterioration; check all hose
clamps for adequate tightness.
•
Front engine mounts-Tighten securely and ensure
that thejam nut is tight.
•
Rear mounts-Check torque to 35-40 lb. ft. (47-54
N·m).
•
Retorque gimbal ring clamping U-bolt to 55 lb. ft.
(74 N·m).
Index
