Mariner 70 - Special Tools; Specifications; Timing Pointer Alignment; Timing;Synchronizing;Adjusting (4 Cylinder Models)

2C-6 ELECTRICAL AND IGNITION 90-13645--2 1095
Timing/Synchronizing/
Adjusting (4 Cylinder Models)
Specifications
Models 100/115
Full Throttle RPM Range
4750 - 5250
Idle RPM (in “FORWARD” Gear) 650 - 700
Maximum Timing @ 3000 RPM
(@ Cranking Speed)
23 B.T.D.C.
(25 B.T.D.C.)
Idle Timing 2 - 4 B.T.D.C.
Spark Plug NGK
BP8H-N-10*
[0.040 in.
(1.0mm) gap]
NGK
BPZ8H-N-10*
[0.040 in.
(1.0mm) gap]
NGK BUHW
Firing Order 1-3-2-4
*Improves running quality between 1800 – 2000 RPM
Special Tools
Part No. Description
*91-58222A1 Dial Indicator Gauge Kit
*91-59339 Service Tachometer
*91-99379 Timing Light
* May be obtained locally.
Timing Pointer Alignment
WARNING
Engine could start when turning flywheel to chec
k
timing pointer alignment. Remove all spark plugs
from engine to prevent engine from starting.
1. Remove aft cowl support bracket.
2. Install Dial Indicator 91-58222A1 into no. 1 (top)
cylinder.
3. Turn flywheel in a clockwise direction until no. 1
piston is a TDC, then set Dial Indicator at “0” (zero).
19062
91-58222A1
4. Turn flywheel counterclockwise until Dial Indica-
tor needle reads approximately 0.600 in. BTDC,
then turn flywheel clockwise, so that needle reads
0.554 in. BTDC exactly.
5. Reposition timing pointer, if necessary, so that
0.554 in. mark is aligned with groove in timing
pointer.
6. Remove Dial Indicator and reinstall spark plug
and spark plug lead on no. 1 cylinder.
22480
a
a - Timing Pointer