PS Magazine - SEPTEMBER 1973
PS, The Preventative Maintenance Monthly
1973 SERIES, ISSUE 250
SEPTEMBER 1973
Having problems with the ob-
turatoR seal?
It should "snaP into pLace± likE yoU
Read aboUt on page
5-23
of
C
h
9
to
T 9±2350²230³12
(Un
6´).
BUt What if it won't?
First o² YoU have tO make sUre
th³ seaL LocKng gr´ove is µee µom
Rust, nic¶s, bURrs, crud or anything
eLse that couLd pRev·nt a c´mpLete¸
c´nTnu´uS Retent¹on of the ob-
tuRatoR with its locking groove.
º»e seA¼ing suR½ces on t¾e Re¿
of the gun tube, µont of the chamber
ass³mbLy, and the matiN sUr½ces of
the ´bturat´r s³aL mUst have nÀ rust,
pits, nicks, bUrrs oÁ anythinG else
that could prevent a continuous gas
tight contact Ià yoUÄRe not sUre these
sur½ces ar³
µOK,
have yoUr µiendly
comPany Mechanic loo¶ Åem over.
Æet tÇe carbon oUt with a bRistLe
ÈrUsh aÉd riÊe bore cleaning com-
poUnd
(RBC¶·
If yoU canÅt get a bristLe
brUsh, a tooth brUsh oR typewriter
brUshÅLl do Ëne.
ÌeveR, bUt never, Use steel wooL,
em³ry cloth or any otheR ¶ind of abraÍ
sive when cLeaning the obturator
seating grÎve in the gun tube, the
´bÏrator seaL itseLf ÐR the chamber
ÑatiÒg And seaLinÓ sUr½ces.
Ôou ¶n´Õ yoÖR obtuRatoR s³aL is
seated Right Õh³n ×´U snap it into
pLace easØL× and Wh³n yoU can Rotat³
it With ×´ÖR ËngeR tips afteR itÄs in
pLaceÙ
Úà y´ÖR ´btÖRat´Û s³AÜ has ݳ³n
aÝÖsed, Þsay Ý× being ReÑoved ´ß³n
Õith a stRaiàát sCReWdRiv³R), it c´uLd
Wiâd uã stR³tch³d ´ut ´Ã shaãe so
it Õ´nÄt ät Ýac¶ in th³ s³at. å³t A
â³Õ ´â³æ
¸¹
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