Marine Power BASE Series Manual page 8

3.
Precautions/Instructions
WARNING! Using a propeller too large will not allow the
engine to reach its rated RPM range which will create an over-
loaded condition and possible destructive detonation that can
be harmful to the engine's performance and life.
PROPELLER INFORMATION
Diameter, pitch or coupling of a propeller will affect
engine RPM and boat performance. Configuration of the blade
also effects performance. Even propellers from different
manufacturers with the same pitch and diameter will perform
differently.
Testing for a correct propeller is accomplished by operating
the boat (with an average load) at Wide Open Throttle (WOT)
RPMs should be at the high end of the specified range and
checked with an accurate tachometer. This will allow the
engine not to fail below the RPM specified range under a
heavy load condition. If the engine RPM is above or below the
specified range, a change in the diameter and/or pitch of the
propeller is required. Newly installed engines operating 100
- 300 RPM below wide open throttle is usually a propeller
problem.
Delco EST Ignition
USING THE TIMING TOOL: Carbureted Engine.
For EFI Engines - Refer to original manufacturer's instructions
but verify that engine is not timed outside of specifications
noted in this manual.
The 3.0 liter (181CID) does not have to be timed unless the
8
distributor is moved during installation. It is timed at the
factory. IMPORTANT! The 3.0 engine is timed at minus 2
degrees, raising the timing will cause the engine to detonate
and blow cylinder head gaskets.
The timing tool is used in setting the initial engine timing on
MARINE POWER carbureted engines. This connector by-passes
the electronic spark timing of the engine and allows the initial
timing to be adjusted by rotating the distributor. Use the follow-
ing procedure (become familiar with entire procedure before
beginning):
1. Connect a timing light to the number one (1) spark plug
wire. Connect the timing light power lead to a 12 volt
power source. (DO NOT CONNECT TO 12 VOLTS ON
ALTERNATOR.)
2. Start engine and allow to warm to operating tempera-
ture. Space linkage so that engine idles at 1,000 - 1,200
RPM.
3. WHILE ENGINE IS RUNNING, install the timing tool
supplied with your engine into the terminal connector on
the distributor.
4. Loosen distributor clamp just enough to rotate distributor
in place.
Note: An adjustable timing light is required to set initial and
total timing.
5. Secure the bare wire and of the timing tool to battery
positive (+) voltage (the most convenient location of this
voltage is on the cranking motor solenoid.) If desired, a
suitable clip, such as an alligator clip may be permanently
attached to the bare wire end of the timing tool to hold
it in place. Once connected the engine idle will drop to
approximately 600 RPM. It is important that the initial
linkage spacing in Step 2 allows the engine to drop to
around 600 with the timing tool connected to 12 volts.
The step spacing may have to be adjusted so that the
engine does settle at 600 RPM after connecting the tool.
6. Rotate distributor to set
REFER TO THE APPROPRIATE "ENGINE IDEN-
TIFICATION" SECTION OF THIS MANUAL FOR
CORRECT TOTAL AND INITIAL TIMING FOR YOUR
ENGINE. IMPORTANT: The 3.0 engine is timed at
minus 2 degrees, raising the timing will cause
the engine to detonate and blow cylinder head
gaskets.
7. Tighten distributor clamp to hold in position when initial
timing is obtained.
8. Recheck timing.
9. Remove the timing tool from distributor.
10. Check total timing at 4,000 RPM. (See Engine Identifica-
tion Section.)
11. Disconnect and remove the timing light.
Fuel Lines
IMPORTANT! In repower applications, inspect all fuel
lines for possible restrictions. Fuel tanks should be installed
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mechanical timing.