TM 5-6115-434-12
d.
Adjustment. Turn adjustment screw, located adjacent to electrical connector, as required, to bring switch
actuation and deactuation points within specified values.
e.
Installation.
(1)
Install satisfactory or replacement oil pressure sequencing switch in place on engine. Secure clamp with
attaching washer and nut. Tighten nut securely.
(2)
Reconnect tube assembly using new gasket and reconnect wiring harness connector to oil pressure
sequencing switch.
3-47. Ignition Unit (fig. 3-15)
a.
Removal.
(1)
Remove wiring harness connector and ignition lead assembly from ignition unit.
Warning
Do not remove the igniter plug or ignition unit unless they have been grounded. The high-
tension lead must be grounded as soon as it is removed from the igniter plug. Ground by
touching the contact spring in the lead to the igniter.
(2)
Remove four attaching bolts and washers securing ignition unit to firewall and remove unit.
b.
Cleaning and Inspection.
(1)
Clean ignition unit by wiping with a clean rag moistened with an approved cleaning solvent.
(2)
Visually inspect ignition unit for cracks, corrosion, damaged connector pins or other evidence of damage.
c.
Test. Connect a satisfactory ignition lead assembly and a satisfactory igniter plug to ignition unit. Connect a 28v
dc power source to ignition unit. Ignition unit must cause igniter plug to spark consistently at a rate of 10 sparks per
second, maximum.
d.
Installation.
(1)
Install satisfactory or replacement ignition unit in place on firewall and secure with attaching washers and
bolts. Tighten bolts securely.
(2)
Reconnect ignition lead assembly and wiring harness connector to ignition unit.
3-48. Igniter Plug (fig. 3-15)
a.
Removal.
(1)
Remove ignition lead assembly from igniter plug.
Warning
Do not remove the igniter plug or ignition unit unless they have been grounded. The high-
tension lead must be grounded as soon as it is removed from the igniter plug. Ground by
touching the contact spring in the lead to the igniter.
(2)
Remove two attaching bolts and washers and remove plug and gasket from engine combustion chamber.
b.
Cleaning and Inspection
(1)
Clean igniter plug electrode by brushing width stiff bristle brush. Wipe exterior of plug with a clean rag
moistened with an approved cleaning solvent.
(2)
Visually inspect plug for cracks, damaged threads, excessive burning, or other evidence of damage.
Check electrode for adequate protrusion.
c.
Test. Connect a satisfactory ignition lead assembly and a satisfactory ignition unit to igniter plug. Connect a 28v
dc power source. Plug must spark consistently at a rate of 10 sparks per second maximum.
d.
Installation.
(1)
Install satisfactory or replacement igniter plug in combustion chamber using new gasket.
(2)
Coat threads of attaching bolts with a film of compound (Fel-Pro C-5). Secure plug with washers and
coated bolts. Tighten bolts to 50 to 70 inch-pound torque.
(3)
Reconnect ignition lead assembly to igniter plug.
3-49. Ignition Lead Assembly (fig 3-15)
a.
Removal. Remove ignition lead assembly from ignition unit and from igniter plug.
Warning
Do not remove the igniter plug or ignition unit unless they have been grounded. The high-
tension lead must be grounded as soon as it is removed from the igniter plug. Ground by
touching the contact spring in the lead to the igniter.
b.
Cleaning and Inspection
(1)
Clean ignition lead assembly with filtered compressed air or wipe with a clean rag moistened with an
approved cleaning solvent.
3-53
