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No start 8N PLEASE HELP

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John.T
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PostPosted: Tue Aug 11, 2020 5:36 pm    Post subject: No start 8N PLEASE HELP Reply to specific post Reply with quote

I have a side distributor 8N that won't start. it has new plugs, wires, cap, rotor, points, condenser, coil, intake gasket, known good carb, new gas, good spark on all plugs new ign switch. cylinder compression is 100psi on 4,3,2 and 75 psi on #1. tractor cranks fine but wont fire. Any ideas what im missing?
 
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Ron W
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PostPosted: Tue Aug 11, 2020 9:14 pm    Post subject: Re: No start 8N PLEASE HELP Reply to specific post Reply with quote

John,

I have done it before, but could it be 180
out of time?
 
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John.T
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PostPosted: Wed Aug 12, 2020 2:21 am    Post subject: Re: No start 8N PLEASE HELP Reply to specific post Reply with quote

CVPost-Ron W wrote:
(quoted from post at 22:14:47 08/11/20) John,

I have done it before, but could it be 180
out of time?



I would think it would pop and back fire. The distributor does not look like it was removed. It was brought to me like this.
 
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Bruce (VA)
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PostPosted: Wed Aug 12, 2020 3:24 am    Post subject: Re: No start 8N PLEASE HELP Reply to specific post Reply with quote

6v or 12v?

You could have a spark issue.


You could have a fuel issue.


Don’t guess. Troubleshoot. See tip # 13 at the link below.


You need to answer 2 questions before you do anything else:


With the bolt in the carb bowl removed and the gas on, will the fuel flow fill a pint jar in less than 2 minutes?


Next, get out your adjustable gap spark checker * , open the gap to 1/4", hook it up, turn the key on and crank the engine. Does the spark jump 1/4"? Post back
with the answers.



* Don't own an adjustable gap spark checker? Buy one! Not a test light! Until then, take an old plug, open the gap 1/4" ground it to the head & look for spark.
It’s not the color of the spark that counts; it’s the distance it jumps.

https://www.autozone.com/test-scan-and-specialty-tools/ignition-tester/oemtools-adjustable-ignition-spark-tester/10257_0_0?
cmpid=PLA:US:EN:AD:NL:1000000:TLS:71700000043798748&gclid=Cj0KCQiAovfvBRCRARIsADEmbRKBdAvAmtFfOvYiYXR7T6NYiW57uyv5-
dEKjVT_h2KogQNUUMsRixYaAlU3EALw_wcB&gclsrc=aw.ds
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Jim L WA
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PostPosted: Wed Aug 12, 2020 7:32 am    Post subject: Re: No start 8N PLEASE HELP Reply to specific post Reply with quote

Heed the advice from Ron W and Bruce (VA), don't assume anything. Until you prove otherwise, I'm betting on 180 degrees out of time or the firing order is way off.
 
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John.T
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PostPosted: Wed Aug 12, 2020 7:41 am    Post subject: Re: No start 8N PLEASE HELP Reply to specific post Reply with quote

CVPost-Jim L WA wrote:
(quoted from post at 08:32:08 08/12/20) Heed the advice from Ron W and Bruce (VA), don't assume anything. Until you prove otherwise, I'm betting on 180 degrees out of time or the firing order is way off.


Thanks for the input. I've tried the carb on my 2n and it runs perfectly also put my 2n carb on the guys 8n. Nothing. I've used a good spark plug to test spark but not a spark tester. In my experience with automotive ign....if the timing is 180 out the engine will pop and backfire. Is that not the case on a 8n?
 
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Snowplow
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PostPosted: Wed Aug 12, 2020 8:52 am    Post subject: Re: No start 8N PLEASE HELP Reply to specific post Reply with quote

As was said I would think if it had spark and gas it would "pop" regardless of all other issues. But... not always. If you can
see spark, even weak spark, generally my thoughts go to gas. Are the plugs wet after cranking? Have you confirmed gas actually
getting to carb? You have as many as 3 screen filters and a fuel shut off. Does it pour out of the fuel inlet when disconnected?
Is the bowl full? Is the ignition switch on when you are cranking... not just testing? Ha... i've done that before.

And did it run before or did you change all those things and now it won't run.
 
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John.T
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PostPosted: Wed Aug 12, 2020 8:59 am    Post subject: Re: No start 8N PLEASE HELP Reply to specific post Reply with quote

CVPost-Snowplow wrote:
(quoted from post at 09:52:22 08/12/20) As was said I would think if it had spark and gas it would "pop" regardless of all other issues. But... not always. If you can
see spark, even weak spark, generally my thoughts go to gas. Are the plugs wet after cranking? Have you confirmed gas actually
getting to carb? You have as many as 3 screen filters and a fuel shut off. Does it pour out of the fuel inlet when disconnected?
Is the bowl full? Is the ignition switch on when you are cranking... not just testing? Ha... i've done that before.

And did it run before or did you change all those things and now it won't run.


Good flow of fuel to carb. Actually runs out of carb sometimes...odd thing is the plugs are not wet
 
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R Geiger
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PostPosted: Wed Aug 12, 2020 9:24 am    Post subject: Re: No start 8N PLEASE HELP Reply to specific post Reply with quote

bring number one cylinder up on compression stoke and see if you are seeing the timing mark. it should be at the 4 degree mark with the piston at tdc, then look to see where the rotor is pointed. Remember the 8n has two sets of timing marks on the flywheel. If the wrong set was used, you would have spark abut not at the correct time. Don't assume that you would have backfire problems, make sure it is right. not hard to do.
 
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lha
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PostPosted: Wed Aug 12, 2020 9:39 am    Post subject: Re: No start 8N PLEASE HELP Reply to specific post Reply with quote

I've done that on old engines myself. To check that theory,move the spark plug wires to number four where number one is
now,then follow the timing order,1-2-4-3. If it runs,you've solved the problem,if not you've eliminated one possible cause.
As Bruce[Va] stated,diagnose the problem before throwing money at it.
 
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Bruce (VA)
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PostPosted: Wed Aug 12, 2020 10:52 am    Post subject: Re: No start 8N PLEASE HELP Reply to specific post Reply with quote

The plugs are not supposed to be wet. If they are you flooded it and it will not start no matter how good your spark is.

Fuel running out of the carb throat tells me you've flooded it. Leave the choke alone and use starter fluid.

An old spark plug is useless for testing spark unless you opened the gap to 1/4". Did you?

The cap goes on one way......but the wires can go on 4 different ways. LOOK at the cap. #1 should say 1. Make sure #1 wire goes there to # 1 plug. Then, it's 1-2-
4-3, CCW.
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Jim L WA
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PostPosted: Wed Aug 12, 2020 10:58 am    Post subject: Re: No start 8N PLEASE HELP Reply to specific post Reply with quote

Good tip iha. I like that.
 
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JMOR
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PostPosted: Wed Aug 12, 2020 12:23 pm    Post subject: Re: No start 8N PLEASE HELP Reply to specific post Reply with quote

CVPost-Jim L WA wrote:
(quoted from post at 14:58:18 08/12/20) Good tip iha. I like that.
Actually better than thinking/assuming that #1 marking on cap means anything....distributor can be stabbed such that any one of 4 will be #1. With only 4 trials at installing wires,, you will have covered all possibilities.
 
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John.T
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PostPosted: Wed Aug 12, 2020 12:31 pm    Post subject: Re: No start 8N PLEASE HELP Reply to specific post Reply with quote

I will check all these things. The owner said it shut off and never started again after he installed cap and points. The distributor appears to never been out for many years due to the dirt around the base but I will check the timing to make sure. The cap is properly indexed and so is the rotor. Thata why I'm so baffled. Even with starting fluid it wont even pop
 
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R Geiger
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PostPosted: Wed Aug 12, 2020 2:25 pm    Post subject: Re: No start 8N PLEASE HELP Reply to specific post Reply with quote

Do you have the little clip under the rotor? easy to lose!
 
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