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1947 RTU No Spark

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sms
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Joined: 13 Aug 2004
Posts: 6609
Location: nys catskill mts

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PostPosted: Mon Jan 21, 2019 5:22 pm    Post subject: Re: 1947 RTU No Spark Reply to specific post Reply with quote

Sorry that abbreviation is used pretty often on this site and I don't think about it. If I Remember Correctly IIRC.
 
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old
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Joined: 12 Mar 2000
Posts: 79042
Location: Lake of the Ozarks area of MO

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PostPosted: Mon Jan 21, 2019 8:40 pm    Post subject: Re: 1947 RTU No Spark Reply to specific post Reply with quote

WRONG I have done so at least 1000 times in the last 30 year and have points in tractors that are almost that old. Clean them and go for a year or more then clean them again. I have tractor that have not had new points installed for more then 20 year and a good cleaning and there good for long time
 
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molinegb
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Joined: 13 Feb 2005
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PostPosted: Tue Jan 22, 2019 6:30 am    Post subject: Re: 1947 RTU No Spark Reply to specific post Reply with quote

Only 30? Been electronics tech way longer.
 
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JKC
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PostPosted: Tue Jan 22, 2019 8:14 am    Post subject: Re: 1947 RTU No Spark Reply to specific post Reply with quote

I wanted to thank you all for responding to my question. I will not get to try these suggestions until Saturday, but wanted to express my thanks. After I get some time in the shop this weekend, I will let you know what works (hopefully)!

Any additional suggestions are still very much welcome!

JKC
 
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JKC
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PostPosted: Tue Jan 22, 2019 8:19 am    Post subject: Re: 1947 RTU No Spark Reply to specific post Reply with quote

SMS, Thank you for clarifying. I haven't been on the forum for quite some time, so was not aware.


Thanks!
 
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JKC
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PostPosted: Tue Jan 22, 2019 8:21 am    Post subject: Re: 1947 RTU No Spark Reply to specific post Reply with quote

Jocco, Thank you for clarifying. I haven't been on the forum for quite some time, so was not aware.

Thanks!
 
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old
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Joined: 12 Mar 2000
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Location: Lake of the Ozarks area of MO

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PostPosted: Tue Jan 22, 2019 8:26 am    Post subject: Re: 1947 RTU No Spark Reply to specific post Reply with quote

Well that number if just that a number could be longer. As for E.T. that started in 1974 you do the math
 
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MMDEL
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PostPosted: Tue Jan 22, 2019 8:31 am    Post subject: Re: 1947 RTU No Spark Reply to specific post Reply with quote

To Old and Molinegb: Forgive me for sticking my nose in this debate. But I know where both of you are coming from. I have been cleaning points for over 75 years. And will continue to do so. However the companies that make points claim that they should never be filed because it removes the contact coating that is on the surface of the points. One thing for sure your hands must be clean when you handle and install points. Wipe off the contacts with a good clean shop rag. Dirty, greasy points right off the bat will cause them to arc (if they do make any contact) and start to damage the contact surface.
Soooo owner be the judge how you want to service your equipment.
MMDEL
 
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MMDEL
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PostPosted: Tue Jan 22, 2019 8:36 am    Post subject: Re: 1947 RTU No Spark Reply to specific post Reply with quote

Molinegb is right points don't seem to be as good as they used to.
MMDEL
 
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JKC
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PostPosted: Tue Jan 22, 2019 8:43 am    Post subject: Re: 1947 RTU No Spark Reply to specific post Reply with quote

MMDEL, Would you happen to have any additional suggestions of what I could check, other than what has already been posted? I respect your
opinion and decades of experience, so happy to hear any of your ideas!

Thanks!

JKC
 
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SWMolines
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PostPosted: Tue Jan 22, 2019 10:14 am    Post subject: Re: 1947 RTU No Spark Reply to specific post Reply with quote

Shop trick number 996 of 1001. The book is almost righting its self.

Wink
 
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T.R.K.
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PostPosted: Tue Jan 22, 2019 5:53 pm    Post subject: Re: 1947 RTU No Spark Reply to specific post Reply with quote

Since you said it had been on 12v, is it possible that there is still a ballast resistor in the hot wire from the switch to the coil? You need to eliminate it if there is.

If you connect your test light to the terminal where the wire from the coil goes into the distribuitor housing and crank the engine over, does it blink? If it does the points are making/breaking at least somewhat.

With the cap off, switch on and points closed, does the coil make a spark jump from the coil wire coming out of the coil when you open the points? Moving the points with your finger should not shock you, You will probably see sparks, but you might want to use a test plug in the coil wire rather than hold it. If not try different points, different condenser, or an other known-to-be good coil. Its not unheard of to get a bad part now and then.

IF you get a good spark from your coil at the coil wire, then you need to try a known-good distribuitor cap and/or rotor button.

Another place the spark can jump to ground on a MM is through the metal wire looms that support the plug wires. So make sure you plug wires have very good insulation there.

Lastly, I have seen several cases where the spark plugs get a grey glaze on the insulator and the tractor suddenly comes to life if the spark plugs are changed. That glaze is due to burning old fuel, but if you want to blame it on the mean old spark plugs, that is your opinion.
 
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MMDEL
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PostPosted: Wed Jan 23, 2019 9:23 am    Post subject: Re: 1947 RTU No Spark Reply to specific post Reply with quote

Thank You very much for the compliment.
TKR came up with a good thought. Do you know if the coil is a 6V or 12V? In any event if there is a resistor in the circuit ahead of the coil remove it. (I have been running a 6V coil with 12V on a Hyster fork lift for 40 years, not recommended) The simplest way to check out an ignition system is the way I started out with my father and uncle on the farm who were great machine men. (Did custom corn shelling for 50 years dad owned the neighborhood threshing machine, and did custom combing) Also this is the way they taught us in the Army at the Truck mechanic course I was fortunate to be placed in. Very simple, because when you are in a war zone you don't have all the bells and whistles for tools and testers.
Take off the cap and dust cover. with the engine turned so the points are open take a screw driver (and scratch to ground) or test light see if you have current (juice, spark) at terminal on coil from switch, if not check switch and wiring back to the battery. If so check terminal on the terminal to the distributor, then post on dist., then the insulated half of the points. Then remove the coil wire from the center of the dist. cap and hold the end 1/8 " from the engine block. With the screw driver bridge the gap between the open points, as you make and break this gap with the screw driver you should get spark at the coil wire to block. If not you may have a bad condenser, then rotate the engine to close the points. Now take your finger to open and close the points you should get spark at the coil wire. If not clean the points. On bad points it may take 3 or 4 cleanings. If this all works then place the rotor in place on the shaft. Hold coil wire with a gap above the contact on the rotor, break the points with finger if you get a spark the rotor is bad and leaking to the shaft. Inspect the inside of the cap look for cracks and carbon traces, clean contact lugs. A good homemade tool to clean the lugs is to take an old screw driver, sharpen the blade like a chisel then heat with a torch and bend 1/4" of the end 90 degrees. You can hold the cap with one hand and scrape the lugs with your new tool.
Any other questions, I usually check this site each morning when I am at the shop.
MMDEL
 
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MMDEL
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PostPosted: Wed Jan 23, 2019 9:30 am    Post subject: Re: 1947 RTU No Spark Reply to specific post Reply with quote

By the way I don't remember from your earlier posts, do you have solid wire, wires to the spark plugs. Carbon silicon wires are a NO NO for points and condenser systems.
MMDEL














c
 
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MMDEL
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PostPosted: Wed Jan 23, 2019 9:36 am    Post subject: Re: 1947 RTU No Spark Reply to specific post Reply with quote

SWMoline if you are taking notes along the way you can be my co writer. I'll even put your picture in the book.
MMDEL
 
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