C.E. Niehoff & Co. C634 Alternator Installation - Manual

II219A Page 1 of 2
This symbol is used to indicate
presence of hazards that can cause
minor property damage.
CAUTION
1. Install alternator as shown in Figure 1:
Slip bushing located in rear
mounting foot must be securely
tightened against alternator
mounting bracket on engine.
Failure to do so can result in
broken mounting feet or broken
upper mounting bracket.
a. Use hardened washers between aluminum
surfaces and bolt heads and nuts.
b. OEM units are shipped with pulley, flat
washer, and locknut installed.
c. Aftermarket units are shipped with shaft
collar, flat washer, and locknut installed.
Remove and discard shaft collar. Install
pulley and furnished flat washer. Torque
locknut to 163 Nm/120 lb. ft.
d. Follow vehicle manufacturer’s
recommendations for belt tension.
2. All cabling, wiring, or conduit must be supported
within 305 mm/12 in. of termination on alternator.
3. Choose wire gauge capable of handling
maximum alternator output with no more
than 0.2 V drop on each leg from alternator
to battery.
Figure 1 - Alternator Installation Details
CAUTION
Hardened washer
4. Regulator is furnished on OEM units and is
supplied separately by request with aftermarket
units. Mounting screws on regulator should be
torqued to 8.5 Nm/75 lb. in.
5. Make electrical connections to A2-128 regulator
as required, using proper ring terminals:
a. Make sure alternator-to-regulator harness
is plugged securely in regulator receptacle.
b. A2-128 regulator has P and F+ terminals with
.2500-20 studs and an IGN terminal with a
#10-24 stud. Torque terminal nuts to 3.4 Nm/
30 lb. in.
• IGN terminal receives power from ignition
source to turn system on only while engine
is running.
• P terminal can tap AC voltage, typically half
the charge voltage. When required, connect
P terminal to tachometer or relay.
• F+ terminal receives field coil power
supply from the battery. If a battery isolator
is used in the system, the F+ terminal must
be connected directly to the B+ terminal
on the battery. If a battery isolator is not
used in the system, the F+ terminal must
be jumpered to the alternator B+ terminal
so that the field circuit becomes activated.
M12/0.50 Locknut
(2 places) – torque to
88 Nm/65 lb. ft.
Slip bushing in rear mounting foot
must be tightened against bracket —
see “CAUTION” above
Bracket
on engine
B– terminal bolt (on left side)
.3750-16 UNC-2A –
torque to 15 Nm/11 lb. ft.
.5000-13 UNC-2A bolt –
torque to 32 Nm/24 lb. ft.
Washer
Battery output
cable terminal
Lockwasher
Insulator
Alternator B+
Terminal Stud
C634
Alternator
Installation Instructions
Bracket mount
.3750-16 UNC-2B
(2 places)