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no fire

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gregjo1948
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PostPosted: Tue Oct 09, 2018 2:51 am    Post subject: no fire Reply to specific post Reply with quote

International 2400A(454) gas 157 ci
This engine starts and runs on #1 & #4 cylinders. 2 & 3 don't fire.

Switched plugs and wires form firing cylinders to non-firing and still no fire. All cylinders have very good compression.(checked with gauge) There is spark on the plugs when extracted from engine and grounded. Carburetor rebuilt(Marvel Schebler). Choke needs to partially applied when running on 1 & 4 cylinders. Center cylinder plugs (2 & 3) are very dry, as if, starving for fuel. Any ideas and/or help would be appreciated. gregjo1948
 
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caterpillar guy
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PostPosted: Tue Oct 09, 2018 3:00 am    Post subject: Re: no fire Reply to specific post Reply with quote

Is the spark the same as on the firing cylinders? Has the manifold been of and left a rag inside. Has it been run lately like this summer and fall? All sounds like possibilities also could be a leaking intake manifold to the head on the gasket.
 
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gregjo1948
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PostPosted: Tue Oct 09, 2018 3:23 am    Post subject: Re: no fire Reply to specific post Reply with quote


Hasn't been run in a while. Was acquired with a small trailer park by my customer. Sprayed the intake manifold with WD40 with engine running (on 1 & 4) with no change. There is a double nut on one of the manifold studs which leads me to believe that the inner nut may have stripped so someone added the second nut. This makes me think the manifold may have been off before. I'm going to remove 2 & 3 plugs, squirt in some gas, replace plugs and fire it up to hopefully get it to fire on all four cylinders. That should, at least, let me know it's lacking fuel.
 
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rustred
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PostPosted: Tue Oct 09, 2018 3:27 am    Post subject: Re: no fire Reply to specific post Reply with quote

have you checked to make sure the firing order is in the correct rotation. if it is counter clockwise then you will only have 1 and 4 firing.
 
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rustred
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PostPosted: Tue Oct 09, 2018 3:29 am    Post subject: Re: no fire Reply to specific post Reply with quote

firing order is 1342 clockwise.
 
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gregjo1948
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PostPosted: Tue Oct 09, 2018 3:56 am    Post subject: Re: no fire Reply to specific post Reply with quote

CVPost-rustred wrote:
(quoted from post at 17:27:03 10/09/1Cool have you checked to make sure the firing order is in the correct rotation. if it is counter clockwise then you will only have 1 and 4 firing.


I didn't see the rotation myself but had an assistant watch it rotate clockwise and the wires were placed for 1342 using that rotation.
 
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Jim48328
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PostPosted: Tue Oct 09, 2018 5:19 am    Post subject: Re: no fire Reply to specific post Reply with quote

If it has a combination intake/exhaust manifold there may be a rust hole between the two sections where the heat crossover is.That will cause exhaust to be taken in instead of air and fuel to those cylinders.Took me a good while to find that one time. Just something to check.
 
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rustybronco
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PostPosted: Tue Oct 09, 2018 7:53 am    Post subject: Re: no fire Reply to specific post Reply with quote

Also point gap issue, distributor cam runout.
 
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old
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PostPosted: Tue Oct 09, 2018 10:01 am    Post subject: Re: no fire Reply to specific post Reply with quote

Why not do a simple test by switching the nonfiring plug wires with each other you have nothing to loose but may well gain a good running engine
 
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gregjo1948
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PostPosted: Tue Oct 09, 2018 10:11 am    Post subject: Re: no fire Reply to specific post Reply with quote

CVPost-old wrote:
(quoted from post at 00:01:02 10/10/1Cool Why not do a simple test by switching the nonfiring plug wires with each other you have nothing to loose but may well gain a good running engine



Been there--done that!! I switched wires with no difference and switched plugs with no difference. Good thought though.
 
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Janicholson
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PostPosted: Tue Oct 09, 2018 10:20 am    Post subject: Re: no fire Reply to specific post Reply with quote

Did it fire on the center cylinders when you squirted fuel in the spark plug holes? it should have run on them for a few seconds. Jim
 
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gregjo1948
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PostPosted: Tue Oct 09, 2018 10:29 am    Post subject: Re: no fire Reply to specific post Reply with quote

CVPost-Janicholson wrote:
(quoted from post at 00:20:52 10/10/1Cool Did it fire on the center cylinders when you squirted fuel in the spark plug holes? it should have run on them for a few seconds. Jim


Haven't tried it yet.
 
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old
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PostPosted: Tue Oct 09, 2018 11:18 am    Post subject: Re: no fire Reply to specific post Reply with quote

It could also have bent push rods on the intake side not letting the valves open so then it get no gas into the cylinders
 
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gregjo1948
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PostPosted: Tue Oct 09, 2018 12:02 pm    Post subject: Re: no fire Reply to specific post Reply with quote

CVPost-old wrote:
(quoted from post at 01:18:08 10/10/1Cool It could also have bent push rods on the intake side not letting the valves open so then it get no gas into the cylinders




If that were the case, I don't think it would have good compression and as I stated earlier, it does.
 
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old
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PostPosted: Tue Oct 09, 2018 1:39 pm    Post subject: Re: no fire Reply to specific post Reply with quote

If the valve did open but not as far as they should it could maybe cause what your seeing to happen.
 
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