Chevrolet 70 1969 Series, Shop Manual

Page: 109 / 913

C AB A N D BO DY M O U N T IN G S 1-82
REFRIGERANT LINE CONNECTIONS
TORQUE SPECIFICATIONS
O U T S ID E D I A M E T E R
O F M E T A L TU BING
T O R Q U E FT.-LBS.
(STEEL)
T O R Q U E FT.-LBS.
A L U M IN U M O R C O P P E R
1/4
10 - 15
5 - 7
3/8
30 - 35 11 - 13
1/2
30 - 35
15 - 20
5/8 30 - 35 21 - 27
3 /4 30 - 35
28 - 33
N O T E : Steel torques to be used only when tube is mated steel-to-steel. If steel
connection is made to aluminum or copper tube fittings, use appropriate " A L U M ­
IN U M O R C O P P E R ” torque specifications.
NOTES ON STORING A N D INSTALLING A /C COMPONENTS
1.
All sub-assemblies are purged and sealed before shipment. Shipping caps
should not be removed until just prior to making connections.
2. All sub-assemblies should be at room temperature before uncapping to pre­
vent condensation of moisture.
3. A complete or partially built-up system should not remain uncapped longer
than necessary to make a connection.
4.
Precautions should be taken to prevent damage to fittings or connections.
5.'
Use only a cloth dipped in alcohol to remove grease or dirt from the outside
of fittings.
6.
Components of questionable condition should not be used.
7. If dirt, grease, or moisture gets inside the lines, the lines should be replaced
or flushed.
8. If internal cleaning of components is required, only dry nitrogen or Refrigerant-
12 can be used.
9.
Prior to assembly, use a small amount of fresh refrigerant oil on all tube and
hose joints and on O-rings.
10.
When tightening joints, use a second wrench to hold the stationary part of the
stationary part of the connection to prevent twisting and hose kinking.
11. Tighten all connections in accordance with recommended torques.
12. To ensure maximum moisture protection, do not connect the receiver-
dehydrator until all other assemblies have been connected.
CHEVROLET SERIES 70 -80 H E A V Y DUTY TRUCK SH O P M A N U A L