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Briggs Model P Help On Bolens Model A Power Ho


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#1 gunstuff1000 ONLINE  

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Posted June 22, 2014 - 11:18 AM

I need some techincal help on a briggs model p engine It's has spark but it's acting like it's not getting gas even though the motor wheel carb is getting the gas it just will not pop off unless I shut some carb cleaner directly into the air intake Any suggestions on what the problem might be?

#2 Bolens 1000 ONLINE  

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Posted June 22, 2014 - 11:37 AM

What kind of compression does it have?

If the engine has been sitting for some time it may have lost the compression needed to suck the fuel up.

I had this happen with my 1948 Power Ho, Pour some oil down the cylinder and give it a few pulls with the plug out.



#3 gunstuff1000 ONLINE  

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Posted June 22, 2014 - 11:51 AM

What kind of compression does it have?
If the engine has been sitting for some time it may have lost the compression needed to suck the fuel up.
I had this happen with my 1948 Power Ho, Pour some oil down the cylinder and give it a few pulls with the plug out.

It has compression There is a compression release on the head the valve was stuck a little I lossen that up last night it just doesn't want to suck the gas I hate to pull the whole head off the motor if I can keep from doing that it would be good don't want to mess up the gasket this engine is very old

#4 Bolens 1000 ONLINE  

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Posted June 22, 2014 - 12:02 PM

The valve may still be sticking a little and have carbon deposits on it.

Do you have the manual for this engine? If not I have a PDF I could post for you.

This is the engine with the Fan on it right?



#5 gunstuff1000 ONLINE  

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Posted June 22, 2014 - 12:07 PM

The valve may still be sticking a little and have carbon deposits on it.
Do you have the manual for this engine? If not I have a PDF I could post for you.
This is the engine with the Fan on it right?

yes it has the external fan an no I don't have a manual

#6 Bolens 1000 ONLINE  

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Posted June 22, 2014 - 12:11 PM

http://gardentractor...-owners-manual/

 

If all else fails you can always cut out a new gasket, sometimes you just have to dig in to rule out the problem......


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#7 superaben OFFLINE  

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Posted June 22, 2014 - 12:33 PM

Is the spark plug wet after you try to start it? 

 

My guess is that you have a weak spark.

 

Ben W.



#8 gunstuff1000 ONLINE  

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Posted June 22, 2014 - 12:38 PM

Is the spark plug wet after you try to start it? 
 
My guess is that you have a weak spark.
 
Ben W.

. It has good spark an no the plug is dry

#9 superaben OFFLINE  

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Posted June 22, 2014 - 03:52 PM

You can have "a spark" but not enough spark to fire the engine when you are under compression pressure. 

 

I would suspect, then, if you have no fuel getting to the plug, that you have a vacuum leak.  I would make sure all the gaskets in the intake side are good. 

 

Ben W.



#10 DougT ONLINE  

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Posted June 22, 2014 - 04:57 PM

If you put your thumb over the intake can you draw gas that you can see? Take the float bowl lid off and take out the float. Look down along the float bowl and locate the passage that takes the gas out of the bowl to the venturi. Take a nozzle on the carb spray and try to spray in it and see if it makes to the venturi. It is a fixed jet carb and prone to having crud in the jet. Sometimes choking it hard will do it.

 

Another thing I had bite me once was that the exhaust valve spring was too loose. The exhaust valve was acting like a second atmospheric intake sucking air. Under compression it would seal good and have good compression.


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#11 gunstuff1000 ONLINE  

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Posted June 22, 2014 - 05:38 PM

If you put your thumb over the intake can you draw gas that you can see? Take the float bowl lid off and take out the float. Look down along the float bowl and locate the passage that takes the gas out of the bowl to the venturi. Take a nozzle on the carb spray and try to spray in it and see if it makes to the venturi. It is a fixed jet carb and prone to having crud in the jet. Sometimes choking it hard will do it.
 
Another thing I had bite me once was that the exhaust valve spring was too loose. The exhaust valve was acting like a second atmospheric intake sucking air. Under compression it would seal good and have good compression.

I have tried the carb cleaning deal an blowing it out Have a question is there suppose to be a gasket on the intake manifold? Because there isn't one on this engine seems like there should be one

#12 gunstuff1000 ONLINE  

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Posted June 22, 2014 - 05:53 PM

Well Doug ur finger tricked worked as a choke it will run but u have to keep taking ur finger off an on to keep it running is there any adjusting these motor wheel carbs?

#13 DougT ONLINE  

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Posted June 22, 2014 - 06:33 PM

No adjustment, it's a fixed jet in that passage. There should be a gasket between the carb and the manifold and between the manifold and valve cage. There should be a copper ring like a sparkplug under the valve cage to the jug.


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#14 gunstuff1000 ONLINE  

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Posted June 22, 2014 - 06:56 PM

No adjustment, it's a fixed jet in that passage. There should be a gasket between the carb and the manifold and between the manifold and valve cage. There should be a copper ring like a sparkplug under the valve cage to the jug.

yea that copper ring is missing. Any ideas as to where I can get one. It is running now just took a few times of choking like you said an now it's running Was driving it around the yard. Just something about walking behind a 1921 tractor!!!
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#15 Bolens 1000 ONLINE  

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Posted June 22, 2014 - 08:06 PM

yea that copper ring is missing. Any ideas as to where I can get one. It is running now just took a few times of choking like you said an now it's running Was driving it around the yard. Just something about walking behind a 1921 tractor!!!

 

Is there a part number for it in the manual I uploaded?

May want to check with superaben as he deals alot in the NOS briggs stuff.






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