Figure 31. Magneto point adjustment.
Clean around each spark plug with a
Figure 30. Timing pointer alined with DC mark on
clean cloth and compressed air. Remove
the spark plugs with a deep ell socke
wrench or a spark plug wrench.
(3) Loosen the point mounting screw and
Clean the plugs with a spark plug sand
adjust the points to 0.008nch to 0.012
blaster. Set the plug gap at 0.025 inch.
Inspect the spark plugs for cracked or
Tighten the point mounting screw.
eroded porcelain, burned electrodes,
damaged threads, or other defects. Test
(4) Position the cover (14, fig. 20) on the
the spark plugs on a spark plug tester.
magneto; secure with the four. cover
Replace defective spark plugs.
Install spark plugs in the cylinder head.
Connect ignition leads.
(5) Time the magneto as directed in c(6) and
71. Spark Plugs and Ignition leads
Disconnect the ignition leads (2, fig. 20), from the spark
a. Spark Plug Service and Replacement.
plug and magneto, one at a time. Install replacement
leads as old leads are removed.
(1) Loosen the nuts that secure the shielded
ignition leads to the spark plugs;
disconnect the leads.
Section VII. COOLANTSYSTEM.
72. Description and Function
the hose off the part to which it is attached. Discon t
The coolant system prevents the temperature in the
pipes with a pipe wrench.
engine combustion chamber, which may reach as high
c Slide replacement hoses over the part to which
as 4,000° F., from damaging the engine. Mainning
they connect; secure by tightening the hose clamps.
coolant system efficiency is important. Engine
Apply pipe joint sealer to the threads of metal water
temperatures must be brought up to and maintained
lines before installation.
within a satisfactory range for efficient operation;
overheating must be avoided.
d Refill the coolant system with coolant.
73. Coolant Line and Hose Replacement
74. W ater Pump.
a.. .Drain the coolant to a level below the line or
hose to be replaced.
Drain the coolant system to a level
the hoses by loosening the hose clamps and sliding 40