TM 5-3805-262-20
5-8. SENDING UNITS AND WARNING SWITCHES MAINTENANCE
a. Engine Oil Pressure Switch.
This task covers removal, cleaning, inspection,
testing and repair, and installation of engine oil pressure switch and its
associated wiring.
TOOLS: No. 1 Common Organizational Maintenance Tool Kit
Combination box and open end wrench set
E l e c t r i c a l r e p a i r t o o l k it
Multimeter
MATERIALS/PARTS: Clean cloths (Appendix C, item 1)
Cleaning solvent P-D-680 (Appendix C, item 2)
Detergent (Appendix C, item 3)
Insulation tape (Appendix C, item 5)
Isopropyl alcohol (Appendix C, item 15)
Electrical cleaner (Appendix C, item 19)
Electrical sealer (Appendix C, item 20)
PRELIMINARY PROCEDURE: Engine
REMOVAL
( 1 ) A t r e a r o f e n g i n e b l o c k ,
from engine oil pressure
f i r m l y p u l l i n g a p a r t.
(2) Loosen and remove engine
NOTE
left rear side panel removed (page 9-14).
b e l o w a l t e r n a t o r, disconnect spade terminal (1)
switch (2) terminal by grasping with fingers and
o i l p r e s s u r e s w i t c h ( 2 ).
( 3 ) A t w i r i n g h a r n e s s b l a c k - w h i t e w i r e,
separate fuseholder (3) halves by
grasping ends with fingers, pushing together, twisting counterclockwise,
and pulling apart.
( 4 ) P u l l r e s i s t o r ( 4 ) f r o m f u s e h o l d e r ( 3)
CLEANING (SHEET 1 OF 2)
h a l f .
Dry cleaning solvent P-D-680 used to clean
W e a r p r o t e c t i v e g o g g l e s a n d g l o v e s a nd
parts is toxic and flammable.
use only in a well ventilated
a r e a . A v o i d c o n t a c t w i t h s k i n , e y e s a n d c l o t h e s a n d d o n ’ t b r e a t he
vapors. Do not use near open flame or excessive heat and don’t smoke
when using it. Failure to do so could cause serious injury. If you be -
c o m e d i z z y w h i l e u s i n g c l e a n i n g s o l v e n t , g e t f r e s h a i r a n d m e d i c al
a t t e n t i o n i m m e d i a t e l y.
If contact with skin or clothes is made, flush
with large amounts of water.
I f c o n t a c t w i t h e y e s i s m a d e , w a s h e y es
with water and get medical aid immediately.
( 1 ) W i p e
ened
exterior of engine oil pressure switch (2) using clean cloth moist-
with cleaning solvent P-D-680. Dry using clean cloths.
5-112
