Andres131313 Posted June 21, 2014 Report Share Posted June 21, 2014 I can't tell if the alternator is a 50 amp or 60. It's a 78' 510 with an l20b Quote Link to comment
ggzilla Posted June 21, 2014 Report Share Posted June 21, 2014 Read the sticker or casting numbers Quote Link to comment
datzenmike Posted June 21, 2014 Report Share Posted June 21, 2014 Generally the US and Canada got the 50. The 60 was an option though Look on the case. Usually there is a foil label LR150 = 50 amp, LR160 = 60 amp. The alt. case may be stamped with a number. 23100-W5802 or W5803 on the 50 amp unit 23100-W5805 on the 60 amp unit Quote Link to comment
ggzilla Posted June 21, 2014 Report Share Posted June 21, 2014 LR160 LR150 Or you could turn the stereo on and use an ammeter to see if the alternator is putting out more than 50 amps. Quote Link to comment
Andres131313 Posted June 21, 2014 Author Report Share Posted June 21, 2014 mike one other question. what is a good tool to prime the oil pump? i know some engines have special tools for that but i dont know about the l20b Quote Link to comment
Andres131313 Posted June 21, 2014 Author Report Share Posted June 21, 2014 thanks by the way guys Quote Link to comment
datzenmike Posted June 21, 2014 Report Share Posted June 21, 2014 I assume this is a fresh rebuild? Remove the pump and fill with oil and replace. Half fill the new oil filter and screw on. Then you could just pull the coil wire off and crank it over. With the valve cover off you will see the oil when it arrives. More work is to drop the oil pump and remove the drive spindle, put the pump back on filled with oil. Remove the distributor and insert a long suitable rod with bladed edge like a screwdriver or cut a long screwdriver shaft and use an electric drill to spin the pump. Takes 10-20 seconds. But then you have to time the motor and put everything back. Quote Link to comment
Andres131313 Posted June 21, 2014 Author Report Share Posted June 21, 2014 no its not a rebiuld. yet. im going to utah from california to pick up the car and everything like the water pump, belt, alternator, fuel pump, hoses, gaskets, air filter,thermostat, and clutch are being replaced. This is so i dont die in the 75 mile stretch or desert i have to drive through. i thought taking a socket/ or flat head attachment to a power drill and puting it down where the distributer goes would work. i know you can do that on chevys. so that wont work on this? any other thinks i might need for the car? it sat for 20 years till i saved it. anything else that could go bad? Quote Link to comment
ggzilla Posted June 21, 2014 Report Share Posted June 21, 2014 You don't need to do that Chevy Small Block needs priming. Datsun L20B has a self-priming pump. Just start the engine - after making sure there's oil in the engine. Quote Link to comment
Andres131313 Posted June 21, 2014 Author Report Share Posted June 21, 2014 ya but the engine hasnt been started since i started it last year. so i dont want to score the bearings Quote Link to comment
datzenmike Posted June 21, 2014 Report Share Posted June 21, 2014 I've pulled apart engines that have sat for 10 years. The bearings are still covered in oil. My 710 sits most of the year and I take it to Canby and that's about it. I never worry about it starting up dry. Just pull the coil wire and crank for twenty seconds and it will be more than primed. Quote Link to comment
ggzilla Posted June 21, 2014 Report Share Posted June 21, 2014 any other thinks i might need for the car? it sat for 20 years till i saved it. anything else that could go bad? Anything and everything can go bad after sitting 20 years. How it was stored is crucial. I'd be most concerned about brakes and tires. And the fuel tank & lines will often give trouble even if it runs OK at first. At least drain the tank via the drain plug if rust comes out replace the tank. Quote Link to comment
Andres131313 Posted July 4, 2014 Author Report Share Posted July 4, 2014 I have a 78 510 and I need a new alternator but I can't find what it is the tag is gone. I was woundering what would happen if I just get the 50 amp alternator (what was common) in the car and it happened to me a 60 amp? Or if the alternative was 60 amps and the care was 50 Quote Link to comment
ggzilla Posted July 4, 2014 Report Share Posted July 4, 2014 It will just work. 60A was optional, 50A was standard. Quote Link to comment
datzenmike Posted July 4, 2014 Report Share Posted July 4, 2014 Mine was 50 amp. I put a 100 amp alt. in it. Everything works better. Quote Link to comment
ggzilla Posted July 4, 2014 Report Share Posted July 4, 2014 With everything on including headlights, radio ,heater and fan, 50A works perfect. If you add additional equipment (eg brighter lights) then it will will work better with a higher capacity alternator. Or if the 50A wasn't putting out (was out of spec) then replacing it will help. Quote Link to comment
Andres131313 Posted July 4, 2014 Author Report Share Posted July 4, 2014 Damn mike. Thanks by the way Quote Link to comment
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