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Ecklers AutoMotive
Username Post: 1957 Generator gets hot        (Topic#354430)
Posts: 2

Loc: Pasco, WA
Reg: 12-12-18
12-17-18 10:20 AM - Post#2754803    

The generator on my 1957 Chevy gets really hot after I drive a bit. Is it the generator, regulator? It is on a small block 327 engine.

Edited by garyi on 12-17-18 10:26 AM. Reason for edit: No reason given.

Ecklers AutoMotive
Ultra Senior Member
Posts: 12236

Loc: Wisconsin..USA
Reg: 09-27-02
12-17-18 02:47 PM - Post#2754842    
    In response to garyi

The generator is air cooled. Fan on front pulley pulls in cool air from rear. Should get warm. If it gets really hot may be a problem with the volt/amp setting of the voltage regulator.

ChevGene 1934 Master sedan 1939 Master DeLuxe Town Sedan 1950 Styline DeLuxe Power Glide 1957 Nomad 283 PG 1963 Corvair Convertible

Senior Member
Posts: 9793
Loc: The Republic of Texas
Reg: 04-30-00
12-19-18 03:36 PM - Post#2755038    
    In response to garyi

It will get hot if it's overcharging. If the voltage regulator is stuck open the generator will overcharge to the point of boiling the acid in the battery.


Posts: 136

Loc: San Francisco Area
Reg: 12-22-07
12-21-18 11:08 PM - Post#2755251    
    In response to garyi

You might also consider loosening the belt and rotating the generator pulley by hand to see if it turns freely. I am thinking about a possible bearing problem. Do this with the ignition off of course. Good luck let us know what you find.

Honored Member
Posts: 27634
Loc: Katy, Tx, USA
Reg: 07-06-00
12-22-18 06:21 PM - Post#2755318    
    In response to apix17

Is the generator functioning properly? I.e., charging at the correct voltage?

Did you polarize the generator after having it disconnected? If not polarized correctly it will try to act as a motor instead of a generator, which makes heat (and it won't be charging).

How hot is "hot"? It should generate some heat when charging, it's not all that efficient.

Frequent Contributor
Posts: 1527
Loc: Granada Hills, CA
Reg: 03-04-09
01-16-19 09:46 PM - Post#2757581    
    In response to Rick_L

I had a generator that got so hot it quit working. Turns out the rear bushing was so worn out that the armature was rubbing on the field and the friction overheated the armature windings and shorted out. I just changed the rear mounting and armature and all is happy.

Tom Ordway If you don't drive it, why have it?

Ecklers AutoMotive
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