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Re: D15 not starting - banging head against wall

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11-14-2013 16:00:54

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I've gone through the carb several times. I've never professed to be a carb master technician, but I'm feeling pretty comfortable with this one by now. The venturi is in place. I am a little suspicious that the fuel is not being sucked up through the intake manifold. The plugs are not really wet at all. But spraying ether in the carb or in the plug holes doesn't make any difference at all.

So confused.

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Dick L

11-14-2013 16:40:37

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 Re: D15 not starting - banging head against wall in reply to TitanTn, 11-14-2013 16:00:54  
Put you hand over the carburetor when cranking it over at full cranking speed. or remove the carburetor and see how much vacuum you have at the manifold. If it trys to suck your hand into the manifold you have enough vacuum to start the tractor. When you cleaned the carburetor did you remove the power jet seat and the discharge tube?

If all of this checks out I would get back to top dead center on number one cylinder and remove the valve cover and make sure both rocker arms are up so you can get a .010 feeler gage on top of both the intake and exhaust valves for number one cylinder.

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11-15-2013 05:28:03

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 Re: D15 not starting - banging head against wall in reply to Dick L, 11-14-2013 16:40:37  
When placing my hand on the carb intake, it's sucking fairly hard.

I did remove the discharge tube, and basically everything that could be removed. The only one I couldn't get out is the jet at the very bottom of the carb. But I sprayed carb cleaner through that jet and it very significantly blew out through the discharge tube.

I guess I'm onto pulling the valve cover.

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11-15-2013 17:57:50

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 Re: D15 not starting - banging head against wall in reply to TitanTn, 11-15-2013 05:28:03  
Well, I pulled the valve cover and everything looked good. Long story short, I've found at least half of the problem. I did not crush the spark plug "washers" enough. So they weren't grounding good. After real tightening them, I got the engine to catch and even run for a few seconds. I'm at a point now where I feel encouraged because the engine is catching and attempting to run. But it's still not running. I've got new plugs, and they're finally getting wet, so I know fuel is getting there. I've been adjusting the timing with the distributor, but it's not having a consistent effect.

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Dick L

11-16-2013 04:38:00

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 Re: D15 not starting - banging head against wall in reply to TitanTn, 11-15-2013 17:57:50  
With the valve cover off you did check both intake and exhaust valves on number one for lash? (the distance between the rocker arm and valve end) with it on TDC? (both rocker arms up)

Any engine with compression, fuel being delivered, sparking at the proper time will run.

Top dead center marks on a fly wheel will show twice for number one. One time both rocker arms will be up the next time one will be down. If one is down you would be 180 off.

The other thing is spotting the FIRE line on the flywheel instead the TDC or CENTER line which would be 30 off on timing.

This is why I ask you to remove the valve cover and check valve lash

If both rocker arms are up and you use the timing instructions I gave first it will run if fuel is getting in the cylinders. If you can turn the distributor as is and get it to run some I would suspect the advance mechanism under the plate the points are mounted on has a problem.

Reading your posts it seems you have ruled out low vacuum to the carburetor and well as not having a good spark. Not running when using starting fluid points back to (timing) when you have a good spark and good compression.


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11-17-2013 15:44:21

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 Re: D15 not starting - banging head against wall in reply to Dick L, 11-16-2013 04:38:00  
Thanks to everyone. It is running. Ultimately I think it was several things, but the biggest issue was the points. I think they've been burnt several times through out this rebuild process. I took the distributor completely apart and cleaned out the advance mechanism and oiled it up good. Cleaned the points and put everything back together. It started and with a little adjustment on the dist. timing, it was running great. I've got some adjustments to do on the carb, but I'm thrilled it's running.

Thanks again for all the help.

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Dick L

11-17-2013 16:27:11

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 Re: D15 not starting - banging head against wall in reply to TitanTn, 11-17-2013 15:44:21  

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11-15-2013 18:36:26

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 Re: D15 not starting - banging head against wall in reply to TitanTn, 11-15-2013 17:57:50  
Check the little square shaped black bakelight insulator, that carries the point wire through the outer wall of the distributor. Also check the point clip, that attaches to the inside of this bolt. easy to get an intermittent ground thataway. Also can be the key switch, if the key is loose, or has a heavy weight of other keys on it, can cause or mask the problem.

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