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This VAC is driving me nuts.

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ADB-Ia
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PostPosted: Sat May 08, 2021 12:44 pm    Post subject: Re: This VAC is driving me nuts. Reply to specific post Reply with quote

Not likely since you are using a 1 quart tank, but could you have gotten a little water in the tank. I've tried several times but I never have got water to burn.lol I had a Briggs one time that I wore myself out pulling the rope (I'm gonna pull this rope till it starts). When I finally drained the gas out, it had some water in it. New gas and it started right up.
 
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PostPosted: Sat May 08, 2021 1:07 pm    Post subject: Re: This VAC is driving me nuts. Reply to specific post Reply with quote

No chance for water to get in since this is fresh gas and I've had 2 carbs one and fill the tank each time
 
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MCOHIO
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PostPosted: Sat May 08, 2021 4:28 pm    Post subject: Re: This VAC is driving me nuts. Reply to specific post Reply with quote

Have you checked if the engine is creating enough vacuum when cranking?
 
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PostPosted: Sat May 08, 2021 5:05 pm    Post subject: Re: This VAC is driving me nuts. Reply to specific post Reply with quote

Yes it has good suction if you hold your handover the air intake of the carb
 
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PostPosted: Sat May 08, 2021 6:37 pm    Post subject: Re: This VAC is driving me nuts. Reply to specific post Reply with quote

Your question is making me think I could have some sort of manifold problem since the suction I get doesn't seem as good as it should be but hard to gauge that
 
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Don Rudolph
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PostPosted: Sat May 08, 2021 7:17 pm    Post subject: Re: This VAC is driving me nuts. Reply to specific post Reply with quote

My BIL's 530 was driving him crazy and after replacing all electrical components and rebuilding the carb found out it was a bad intake manifold gasket. It came down to being about the only thing possible left to check out. Don
 
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MCOHIO
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PostPosted: Sun May 09, 2021 8:13 am    Post subject: Re: This VAC is driving me nuts. Reply to specific post Reply with quote

A compression test could be beneficial. Holding your hand over the intake is a good idea but only checks the engine as a whole. A cylinder that has low compression will conversely have low vacuum.
 
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PostPosted: Sun May 09, 2021 9:56 am    Post subject: Re: This VAC is driving me nuts. Reply to specific post Reply with quote

The cylinders I checked had around 120psi which should be more then enough to run well
 
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MCOHIO
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PostPosted: Sun May 09, 2021 10:11 am    Post subject: Re: This VAC is driving me nuts. Reply to specific post Reply with quote

Maybe a long shot but have you confirmed that the plug wires are in the correct order? I had a Ferguson that drove me up the wall until I realized I installed the plug wires in the opposite rotation of the distributor. I was having the same issue that you have described.
 
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PostPosted: Sun May 09, 2021 10:33 am    Post subject: Re: This VAC is driving me nuts. Reply to specific post Reply with quote

Firing order has been checked and double check and is correct. I even tried it 180 out to be sure and that caused back fire big time. I'm thinking maybe a bad manifold with a hole into the exhaust or some such. I have at least one spare manifold off one of my parts VACs
 
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MCOHIO
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PostPosted: Sun May 09, 2021 12:43 pm    Post subject: Re: This VAC is driving me nuts. Reply to specific post Reply with quote

Many moons ago my grandfather had a lot of problems with the manifold on a 49 SC. You seem to have the best solution in mind with swapping parts. Please give an update post when you figure it out. This will be probably a forehead slapper in hindsight.
 
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PostPosted: Sun May 09, 2021 1:04 pm    Post subject: Re: This VAC is driving me nuts. Reply to specific post Reply with quote

First step is to find a manifold gasket for it. Not really sure howto test if a manifold has a hole or some such thing wrong with it
 
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MCOHIO
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PostPosted: Sun May 09, 2021 1:21 pm    Post subject: Re: This VAC is driving me nuts. Reply to specific post Reply with quote

One easy way would be to stuff some rags tightly into the exhaust ports and pour water in the exhaust stack. Any holes internally will allow water to exit the intake ports or carb mount.
 
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PostPosted: Sun May 09, 2021 1:26 pm    Post subject: Re: This VAC is driving me nuts. Reply to specific post Reply with quote

I'm talking test while still on the engine. Off the engine is pretty easy
 
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rfdmn
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PostPosted: Mon May 10, 2021 8:30 am    Post subject: Re: This VAC is driving me nuts. Reply to specific post Reply with quote

CVPost-old wrote:
(quoted from post at 14:21:13 05/08/21) Yes has good gas flow to the carb and the open end of the carb at times shows to much gas. No air cleaner at this time. What gets me is I had it running the other day then fixed the hoses and now will not start again. Have a new cap and rotor I will be putting on when I get back to it
Just a thought. Have you tried retarding the timing. Maybe the mechanical advance in the distributor is sticky from setting and has stuck full advance.
 
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