Pop in exhaust manifold

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DeeF88
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Pop in exhaust manifold

Postby DeeF88 » Sun Nov 20, 2016 7:55 pm

Just rebuilt my 1949 Farmall cub, tried starting and it would smoke out of the exhaust followed by a very loud bang( I'll try to post video below) any ideas on what would cause this? And what to do to fix this? Thanks everyone!!

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Re: Pop in exhaust manifold

Postby ScottyD'sdad » Sun Nov 20, 2016 8:31 pm

Timing?
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Re: Pop in exhaust manifold

Postby ricky racer » Sun Nov 20, 2016 8:58 pm

Explain "bang". Was it a mechanical noise a backfire or what?
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Re: Pop in exhaust manifold

Postby Barnyard » Sun Nov 20, 2016 9:02 pm

Your timing may be 180 out.
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DeeF88
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Re: Pop in exhaust manifold

Postby DeeF88 » Mon Nov 21, 2016 2:45 pm

It wasn't anything mechanical, It sounded more like a backfire, unfortunately it won't let me upload the video. If it's timing how do I fix that? Thanks guys!

razerface
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Re: Pop in exhaust manifold

Postby razerface » Mon Nov 21, 2016 4:56 pm

mag or distributor? I have one with dist,,i never care how things line up. Put it on #1 tdc and start with wires wherever the rotor points. With mag, take it out, turn it 180 and put it back in,,,static time it (see youtube).

DeeF88
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Re: Pop in exhaust manifold

Postby DeeF88 » Mon Nov 21, 2016 6:08 pm

It has a mag, I'll check YouTube for timing, thanks!

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Re: Pop in exhaust manifold

Postby Glen » Mon Nov 21, 2016 6:45 pm

Hi,
Here are pages from the 1949 Cub owner's manual telling about the magneto. The 1st page shows how to replace the points. The 3rd page tells how to time it. :)

http://farmallcub.com/rudi_cub/www.clea ... age-30.jpg

http://farmallcub.com/rudi_cub/www.clea ... age-31.jpg

http://farmallcub.com/rudi_cub/www.clea ... age-32.jpg

DeeF88
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Re: Pop in exhaust manifold

Postby DeeF88 » Wed Dec 07, 2016 10:39 am

Thanks! I timed it just like they said in instructions, don't hear the pop noise when starting but now I can't get engine to turnover to fully start. Any suggestions? Thanks!

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Re: Pop in exhaust manifold

Postby Chipmaker » Wed Dec 07, 2016 11:52 am

Timing may still be off the other way now. If you just rebuilt it and your sure the timing is right you may have to pull start it the first time, if it's to tight, I would only do that as a LAST resort though.
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Re: Pop in exhaust manifold

Postby k hutchins » Wed Dec 07, 2016 1:28 pm

If it has a mag. I would crank it before trying to pull start.
Double chk the firing order, it should be 1 at top followed by 3, 4, and 2 going clockwise around the cap.
Why is there never enough time to do the job right, but always enough time to do it over. :?:

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Re: Pop in exhaust manifold

Postby AL Farmall Boy » Wed Dec 07, 2016 3:49 pm

Please post some good pictures of the tractor, the engine, the distributor/mag, etc. We will have it going in no time!

To me, sounds like its out of time, and now probably a weak battery
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Re: Pop in exhaust manifold

Postby Glen » Wed Dec 07, 2016 7:47 pm

Hi,
Charge the battery if it is low, or it won't crank the engine as fast as it should. After you get it to run, you should check the timing with a timing light to be sure it is right. :)

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Re: Pop in exhaust manifold

Postby BigBill » Sun Jan 15, 2017 11:59 pm

Did you use plastic gauge on the bearings to check all the clearances? One mix up on the bearing size could make the engine tighter than it could be.

I had a head mechanic at a dealership tell me they don't use plastic gauge. I assembled the engine and sealed the oil pan good. I knew it was too tight but I kept my mouth shut. The guy was a jerk. The bearings weren't in a box they were all loose little boxes. This told me he mixed and matched them. Of course the wrong size could be in the wrong box. There's never time to do it right, but always time do it over.
I'm technically misunderstood at times i guess its been this way my whole life so why should it change now.


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