Advertisement
c
c
c
2.
In each case the cause s of trouble are given in the order in which they are
most apt to occur.
In many cases the remedy is apparent, and in such cases
no further remedies are suggested.
Starting difficultie s / Fuel mixture
- No fuel in tank.
-
Fuel pump diaphragm worn out, so pump does not apply carburetor with fuel.
- Fuel pump diaphragm worn out, so pump doe s not supply carburetor with fuel.
- Ca.rburetor not choked sufficiently, especially if engine is cold.
- Water, dirt, or gum in gasoline interfering with free flow of fuel to carbure
-
tor.
- Poor grade or stale gasoline that will not vaporize sufficiently to form the
proper fuel mixture
.
- Carburetor flooded, caused by too much choking especially if engine is hot.
3.
Compression
- If the engine has proper compression, considerable resistance will be
en-
countered in the pull on the starting sheave.
If this resistance is not en
-
countered, compression is faulty.
Following are some reasons for poor
compres sion:
- Cylinder dry due to engine having been out of use for some time.
-
Loose spark plug or broken spark plug.
In this case a hissing noise will be
heard in cranking engine due to escaping gas mixture on compression stroke.
- Damaged cylinder head gasket or loose cylinder head.
This will likewise
cause hissing noise on compression stroke.
- Piston rings stuck in piston due to carbon accumulation.
If
rings are stuck
very tight this will necessitate removing pistons.
Scored cylinder. This will require reboring of the cylinder and fitting with new
piston and rings. If scored too severely an entirely new
cylind~r
may be nec
-
essary.
4.
Ignition
- Ignition cable disconnected from magneto, coil. or spark plug.
-
Broken ignition cables, causing short circuits.
-
Ignition cable wet or oil soaked.
- Spark plug insulator broken.
-
Spark plug
~et
or dirty.
- Spark plug point gap wrong.
- Condensation on spark plug electrodes.
-
Magneto breaker points pitted or fused.
- Magneto breaker arm sticking.
- Magneto condenser leaking or grounded.
- Spark timing wrong.
Correct timing. 140
-
. 160 before T. D. C.
5.
Engine misses
- Spark plug gap incorrect.
- Worn and leaking ignition cable.
- Weak spark.
- Loose connections at ignition cable.
- Magneto breaker points pitted or worn.
- Water in gasoline.
-
25-
Advertisement
