smoreau 658 #1 Posted December 2, 2012 (edited) I just picked up a 68 Charger 12 with a good engine with a very rusty body that needs a lot of work. I also have a 312-8 with a Magnum 12 with a blown rod and a fairly nice body. I would like to put the Engine from the charger on the 312-8 for a better tractor for my dads place. His c81 doesn't have enough power for his grass cutting needs. I would like to make the c81 as plowing only and the 312-8 for grass duty. So my question is do I just use the block or do I use the the old k301 sheet metal. It does have a points magneto ignition on the k301 and the Magnum has the outside mag. I know the older K301 doesn't have the bosses to mount the coil, but should I change the sheet metal over to make it look right. The dipstick is the screw in type witch should be fine for my needs. but at least it would look right. Just need your opinions. Edited December 2, 2012 by smoreau Share this post Link to post Share on other sites
smoreau 658 #2 Posted December 2, 2012 Also the K301 has the vacuum style fuel pump. Will it be able to pull the fuel from the tank under the seat? The original k301 carb works, but the throttle shaft is shot and the Magnum carb and fuel pump are fine. Share this post Link to post Share on other sites
TT-(Moderator) 1,162 #3 Posted December 2, 2012 I'd use everything possible from the K-301. You need it to use, so appearance doesn't matter. Paint the K black and it really wouldn't be much different than an '85/'86 312 ~ other than the missing battery ignition coil. Share this post Link to post Share on other sites
smoreau 658 #4 Posted December 2, 2012 I didn't think about the early ones. They were a K series, I think that will be the plan for getting it working again. So any thoughts on the fuel pump and carb? Share this post Link to post Share on other sites
TT-(Moderator) 1,162 #5 Posted December 2, 2012 The carb and the pump from the M12 should work fine on the K. One nice thing about the K having the mag is that you can still use the 312's ignition switch. The charging system will probably require some attention, but I don't know which stator is in the M12. Share this post Link to post Share on other sites
smoreau 658 #6 Posted December 2, 2012 Worst case I have 2 good stators flywheels, and coils from bad k301 shaker mount engines. I should be able to change that if needed. Just don't want to open it up to change a bearing plate. Just want to make it simple and dependable tractor that several family members can use when needed. Thanks TT for the help again!! Share this post Link to post Share on other sites
TT-(Moderator) 1,162 #7 Posted December 2, 2012 It's been a while since I changed my old Raider 12 engine over from mag ignition / 10amp alternator to battery ignition / 15amp alternator, but I'm thinking I had to change the bearing plate too. I'm thinking that the mounting pattern for the newer stator is different, but without going to the shop and looking, I'm not positive. :scratchead: Share this post Link to post Share on other sites
TT-(Moderator) 1,162 #8 Posted December 2, 2012 They are different...... I found the picture I thought I had: Share this post Link to post Share on other sites
smoreau 658 #9 Posted December 2, 2012 (edited) Sounds like I may be changing a bearing plate. I do want a good charging system on this and with out ever being into one of these older mag-points engines I would have never known. What do you think that style charging system puts out? 5-10 amps? Edited December 2, 2012 by smoreau Share this post Link to post Share on other sites
TT-(Moderator) 1,162 #10 Posted December 2, 2012 The one in my picture is 10amp Share this post Link to post Share on other sites
smoreau 658 #11 Posted December 2, 2012 So if my charging system does work on my k301 in the 68 Charger 12, 10amps should be fine? The 312-8 does have the idiot lights and I do want the head lights to work with out the battery going dead. I do use battery maintainers on the tractors at my parents, They can sit for weeks-months without being used. Share this post Link to post Share on other sites
TT-(Moderator) 1,162 #12 Posted December 2, 2012 10amps should be fine. Don't forget - the magneto ignition doesn't use any battery power. I don't know the formulas for figuring out the amperage requirement, but even if you switched it over to battery ignition and kept the 10amp stator, it would probably be fine with the stock lighting. Share this post Link to post Share on other sites
smoreau 658 #13 Posted December 2, 2012 That's what I was thinking. Thanks again Terry! Share this post Link to post Share on other sites
KATO 115 #14 Posted December 2, 2012 Watts divided by Volts = amps Example :standard 1156 bulb is about 27 watts. / 12 volts =2.25 amps Share this post Link to post Share on other sites
smoreau 658 #15 Posted December 2, 2012 (edited) Watts divided by Volts = amps Example :standard 1156 bulb is about 27 watts. / 12 volts =2.25 amps Remember that when the engine is running it is not 12 volts, its 14 volts = 1.93 amps. The tractor that it's going in has larger head lights and 2 tail lights. 86 312-8 to be exact. Edited December 2, 2012 by smoreau Share this post Link to post Share on other sites
TT-(Moderator) 1,162 #16 Posted December 2, 2012 An '86 312 should have a K-301..... It would have to be an '87 or newer. Share this post Link to post Share on other sites
smoreau 658 #17 Posted December 2, 2012 I didn't run the #'s on it, just knew it had the idiot lights on it. I don't have a pic of it as its over in my buddy's lean to. need to change the front tires to 8" rims as it only has one long spinal. I have rims for it and spinals. I got it for the good sheet metal that is on it. Know it will be put back to work at my parents place. Share this post Link to post Share on other sites
