Mixing Alternator Parts: Pulley Nut Torque; Internally & Externally Regulated

[SuperDuperCruizer]

Mixing up alternator parts. I needed to swap pulleys with the correct off-set.

My first question: What's the tightening torque of the pulley nut? I didn't find anything in search but I did find this:

Alternator Pulley Removal and Installation Instructions

My next question: How do you know if the alternator is internally regulated?

My last question: Can you use an internally regulated alternator if your truck has an external regulator?

 

[SuperDuperCruizer]

For posterity from the website link posted above:

ALTERNATOR PULLEY REMOVAL AND INSTALLATION INSTRUCTIONS, WHAT YOU SHOULD KNOW
Pulley Removal and Installation for Alternators with External and Internal fans:

1. To remove the alternator pulley, use a 1/2" Drive impact wrench to loosen the nut.
Most automotive Alternator pulleys use a 15/16 socket. Hold the alternator pulley firmly.
You should use a rag or better a heavy glove. Alternators with external fans can rip up
your hand pretty good if the fan is allowed to spin while removing the pulley. I know this
from experience so be careful. It is recommended that a protective glove and eyewear
be used. The pulley nut uses standard, right-hand threads, rotate in a counter-clockwise
direction for removal as looking at the front of the alternator.

2. Alternator pulleys do not have a key and should be a slip fit. sometime thread locking
fluid or rust gets between the shaft and pulley and a slight amount of heat or puller is
needed to remove the pulley, do not overheat. Install the new pulley, lock washer, and nut by hand.

3. Tighten the nut with an impact wrench until nut is tight (about 70 ft-lbs).
The lock washer must be completely closed. Do not over tighten.

NOTE : Many internal fan alternators use a self-locking nut that do not use a separate lock washer.
You may also use thread locking liquid for better hold.Typical Automotive pulleys are designed
for a 17mm shaft smaller units have a 15mm shaft and some pulleys may require adapter bushing.

 

[ryanwk628]

Thank you for this! I am replacing my alternator and the rebuilt one has the smaller/narrow pulley so I am going to swap on the wide pulley from the alternator I am removing. Was not sure of the torque spec

 

[Coolerman]

You cannot tell just by looking at an alternator (unless you are familiar with the model) if it is internal or externally regulated. Just about all modern alternators built after 1978 are internally regulated, but there are many exceptions.

You can indeed use an internally regulated alternator in your externally regulated truck with just a couple of simple wiring changes.

 

[ryanwk628]

You cannot tell just by looking at an alternator (unless you are familiar with the model) if it is internal or externally regulated. Just about all modern alternators built after 1978 are internally regulated, but there are many exceptions.

You can indeed use an internally regulated alternator in your externally regulated truck with just a couple of simple wiring changes.

Thanks. This is the alternator I purchased, it claims to be a direct replacement and appears so save for the pulley, but I could be wrong. ACDelco 334-1554 for 19134547. Does that look correct? I just replaced the voltage regulator as well but have not run the vehicle as I am still getting it back together

 

[Coolerman]

That is definitely an EXTERNALLY regulated alternator.
You can tell due to the connector labeled FEN. F is for field which connects to the external regulator. E is for ground and N is used for a charge light.

 

[ryanwk628]

That is definitely an EXTERNALLY regulated alternator.
You can tell due to the connector labeled FEN. F is for field which connects to the external regulator. E is for ground and N is used for a charge light.

Thanks, that is what I thought. My Toyota regulator is on the fire wall just up from the high beam switch