Maintenance and Adjustments
Teledyne Continental Motors, Inc.
TM
9-14
IOF-240 Series Engine Maintenance Manual
29 November 2006
Table 9-4.
Approved Spark Plug List
Manufacturer Part Number TCM Part Number Barrel Size GAP
CHAMPION
RHM38E
630049
3/4-20
.016” - .021”
REM38E
628325
5/8”-24
.016” - .021”
AUTOLITE by UNISON
UREM38E
655902
5/8”-24
.016” - .021”
URHM38E
655915
3/4-20
.016” - .021”
6.
Clean the spark plugs (new or re-used) as directed in the “Cleaning” section in this
chapter. Set the spark plug gap using manufacturer’s data for the appropriate part
number.
CAUTION: Failure to install a new spark plug gasket any time a
spark plug is installed may result in incomplete sealing of the
combustion chamber, loss of spark plug heat transfer, spark plug
overheating, possible re-ignition/detonation, and internal engine
damage.
7.
Install a new copper gasket on all 8 spark plugs.
8.
Refer to the spark plug rotation chart (Figure 9-4); mark serviceable spark plugs with
the respective “destination” positions. For all remaining locations, replace with a new
spark plug.
T
B
T
B
T
B
T
B
CYL NO.
CYL NO.
1---T
1---B
2---T
2---B
3---T
3---B
4---T
4---B
4---B
4---T
3---B
3---T
2---B
2---T
1---B
1---T
TO
TO
TO
TO
TO
TO
TO
TO
Reduce wear of spark plug electrodes due to constant
polarity, either negative or positive, by reversing
bottom (B) spark plugs with top (T) spark plugs per chart.
Figure 9-4.
Spark Plug Rotation Chart
9.
Sparingly apply Champion spark plug lubricant to all except the first row of threads
on the spark plug.
