C.E. Niehoff & Co. N1240-2/3 & N1243-2/6 Alternators Installation - Manual

II85C Page 1 of 1
N1240-2/3 and N1243-2 Alt. with N3218 Regulator
N1243-6 Alt. with N3271 Regulator
Installation Instructions
This symbol is used to indicate
presence of hazards that can cause
minor property damage.
CAUTION
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.
Figure 1 - Alternator Installation Details
CAUTION
1. Units are shipped with pulley, belleville washer, and
nut. Check torque on locknut for 163 Nm/ 120 lb. ft.
2. Use hardened washers between aluminum surfaces
and bolt heads and nuts. Torque mounting bolts to
88 Nm/65 lb. ft.
3. All cabling, wiring or conduit must be supported
within 305 mm/12 in. of termination on alternator.
4. Choose wire gauge for B+ and B– cables capable of
handling maximum alternator output with minimum
voltage drop.
C. E. Niehoff & Co. • 2021 Lee Street • Evanston, IL 60202 Tech Services Hotline 800-643-4633
B+ terminal
(on reverse side of control unit)
M12x1.75 Bolt –
torque to 32 Nm/24 lb. ft.

B– terminal
M10x1.5 Bolt –
torque to 15 Nm/11 lb. ft.

M12/0.50 in. Locknut –
torque to
88 Nm/65 lb. ft.

Hardened washer

Slip bushing must be tightened against
bracket — see “CAUTION” above

M20x1.5 Nut
torque to 163 Nm/120 lb.ft.
 
Belleville washer
M12/0.50 in.
mounting bolt
(full length)

Hardened
washer

Bracket
on engine
Alternator
mounting
bracket
on engine


M12x1.75 Mounting bolt –
torque to 61 Nm/45 lb. ft.
Hardened washer


Vehicle harness
connection

Regulator IGN terminal;
torque to 4.5 Nm/40 lb. in.