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| | | | Joined: Dec 2010 Posts: 62 'Bolter | | 'Bolter Joined: Dec 2010 Posts: 62 | I'm working on the 270 out of my GMC 350 and I noticed the ears where the bolts attach the generator to the engine are both snapped off. I happen to have a 55 Cadillac engine,V8, in the garage. It has an intact generator. Can I use it on my 270 ? thanks in advance | | | | | Joined: Jun 2011 Posts: 5,096 Crusing in the Passing Lane | | Crusing in the Passing Lane Joined: Jun 2011 Posts: 5,096 | Electricity knows no brands, if it fits, use it.
Ed
'37 GMC T-18 w/ DD 4-53T, RTO-610, 6231 aux., '95 GMC running gear, full disc brakes, power steering, 22.5 wheels and tires.
'47 GMC 1 ton w/ 302, NP-540, 4wd, full width Blazer front axle.
'54 GMC 630 w/ 503 gasser, 5 speed, ex fire truck, shortened WB 4', install 8' bed.
'55 GMC 370 w/270, 420 4 speed, grain, dump bed truck from ND. Works OK.
| | | | | Joined: Feb 2004 Posts: 29,767 Kettle Custodian (pot stirrer) | | Kettle Custodian (pot stirrer) Joined: Feb 2004 Posts: 29,767 | Be sure to swap the regulator from the Cadillac as well. The Caddy will probably have a higher-amperage generator than the GMC, which is a good thing, but in order to make use of the higher capacity, the corresponding regulator must be used, or your original regulator would have to be reset to the higher amp rating. The Cadillac generator will probably have ball bearings front and rear and it will probably be longer from end to end, so some tinkering with the GMC bracket might be necessary. I usually use a short section of 1/4" pipe as a spacer, with a longer bolt on one end.
Someone who is skilled with a TIG welder can fix those broken end frames, so don't discard them.
Jerry
"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!
| | | | | Joined: Dec 2010 Posts: 62 'Bolter | | 'Bolter Joined: Dec 2010 Posts: 62 | yes I noticed today the caddy gen.is longer. Don't have the regulator from the caddy so I'll see about getting one of those. | | | | | Joined: Feb 2004 Posts: 29,767 Kettle Custodian (pot stirrer) | | Kettle Custodian (pot stirrer) Joined: Feb 2004 Posts: 29,767 | OK- - - -I just looked up some specifications. 54-56 Cadillacs ran a 30 amp generator, which is probably the same as the GMC ran. Your regulator will most likely work without doing any swapping. Be sure to polarize the generator by momentarily touching a jumper wire from the BAT terminal on the regulator to the ARM terminal. (about 1 second is plenty) That's particularly important if the GMC is running a positive ground electrical system. The generator will work on either polarity as long as it's polarized after installation.
Jerry
"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!
| | | | | Joined: Dec 2010 Posts: 62 'Bolter | | 'Bolter Joined: Dec 2010 Posts: 62 | Thanks for the info !
It was a little windy today but I got the engine all painted today.
I'm going to sand blast the manifold tomorrow and see about making the caddy gen fit.
Last edited by hotshoe99; 04/15/2020 10:30 PM.
| | | | | Joined: May 2017 Posts: 330 'Bolter | | 'Bolter Joined: May 2017 Posts: 330 | After you have followed Hotrod's advice above and you have it running, you will likely need to adjust the regulator for voltage. At least check to make sure it is properly charging and not just brightening the lights. Perhaps you know this already.
Mac :{)
1962 K10 short step side, much modified for rally
1969 T50 fire truck, almost nos, needs a few things
| | | | | Joined: Jun 2011 Posts: 5,096 Crusing in the Passing Lane | | Crusing in the Passing Lane Joined: Jun 2011 Posts: 5,096 | If you have the manifold(s) off for sandblasting, make sure if you separate them, you only loosely connect them together until you tighten the nuts(brass I hope) holding them to the head, then you can tighten them together.
Ed
'37 GMC T-18 w/ DD 4-53T, RTO-610, 6231 aux., '95 GMC running gear, full disc brakes, power steering, 22.5 wheels and tires.
'47 GMC 1 ton w/ 302, NP-540, 4wd, full width Blazer front axle.
'54 GMC 630 w/ 503 gasser, 5 speed, ex fire truck, shortened WB 4', install 8' bed.
'55 GMC 370 w/270, 420 4 speed, grain, dump bed truck from ND. Works OK.
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