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19.5HP Briggs & Stratton - Yardman Mower Engine Problems

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19.5HP Briggs & Stratton - Yardman Mower Engine Problems infiniteMPG 06-15-2007
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Posted by infiniteMPG on June 15, 2007, 9:24 am
I have a handed down Yardman Lawn Tractor with a 19.5HP Briggs &
Stratton 3672CN engine. Got this last year and ran fine all year
without problems starting or running. Haven't run it in several
months and when I tried it last week the battery was too low to turn
engine over. Replaced battery but then engine would just crank and
crank and never fire. Pulled air cleaner off and sprayed some starter
fluid in and would run until fluid ran out and then cut off. Pulled
carb and cleaned everything I could with carb cleaner and made sure
everything was free moving. Pulled cap lock screws out and float was
trapped under mid-gasket and didn't have a new gasket so I sprayed in
the float area with carb cleaner without removing it. Pulled the plug
on the side of the float area and let the carb cleaner run completely
thru. Replaced fuel filter even though fuel was free flowing.
Replaced carb and after starting with starter fluid a few time, it
started running on it's own. Idled fast and stayed running smooth as
long as I just let it sit there.

I put it in gear and moved forward and backwards a few times and as
soon as any additional load was put on the engine, the engine would
slow, the lower butterfly below the carb would start to shut and the
engine would just cut off. Also, if I even just barely started to
engage the blades the engine would die. Was told there was also an
oil level safety on this engine but the oil level is correct. It
appears that the engine runs fine but has no power under load. When
any load is added to the idle condition the engine dies. I tried
adjusting the metering needle screw on the carb but that had no effect
unless I went in too far and then the engine would sputter and die.

Any and all help would be greatly appreciated as with the recent rains
I will soon need a field guide to find my front door :O)

Scott
57classic@gmail.com


Posted by Meat Plow on June 15, 2007, 10:05 am
On Fri, 15 Jun 2007 06:24:13 -0700, infiniteMPG wrote:

> I have a handed down Yardman Lawn Tractor with a 19.5HP Briggs &
> Stratton 3672CN engine. Got this last year and ran fine all year
> without problems starting or running. Haven't run it in several
> months and when I tried it last week the battery was too low to turn
> engine over. Replaced battery but then engine would just crank and
> crank and never fire. Pulled air cleaner off and sprayed some starter
> fluid in and would run until fluid ran out and then cut off. Pulled
> carb and cleaned everything I could with carb cleaner and made sure
> everything was free moving. Pulled cap lock screws out and float was
> trapped under mid-gasket and didn't have a new gasket so I sprayed in
> the float area with carb cleaner without removing it. Pulled the plug
> on the side of the float area and let the carb cleaner run completely
> thru. Replaced fuel filter even though fuel was free flowing.
> Replaced carb and after starting with starter fluid a few time, it
> started running on it's own. Idled fast and stayed running smooth as
> long as I just let it sit there.
>
> I put it in gear and moved forward and backwards a few times and as
> soon as any additional load was put on the engine, the engine would
> slow, the lower butterfly below the carb would start to shut and the
> engine would just cut off. Also, if I even just barely started to
> engage the blades the engine would die. Was told there was also an
> oil level safety on this engine but the oil level is correct. It
> appears that the engine runs fine but has no power under load. When
> any load is added to the idle condition the engine dies. I tried
> adjusting the metering needle screw on the carb but that had no effect
> unless I went in too far and then the engine would sputter and die.
>
> Any and all help would be greatly appreciated as with the recent rains
> I will soon need a field guide to find my front door :O)

Still got carb problems.


Posted by infiniteMPG on June 15, 2007, 10:18 am
>>Still got carb problems.

The carb is pretty simple, the only thing I didn't dig into was the
float. When the top cap is removed the gasket is stuck to the bottom
of the carb housing. The float mechanism seems mounted to something
in the top half and something is under the gasket in the bottom half.
So unless I scrap the gasket off and replace it I can't seperate the
halves. Does this sound like float issues? Should the entire float
mechanism be relaced or could it just be sticking?

Sounds like a trip to the parts shop to get a gasket and a float or a
complete rebuild kit. I checked and did not see ANY numbers or
identifiers on the carb anywhere. How do you ask for a rebuild kit or
float or would there just be one carb available on the 19.5hp 3672CN
engine?

Thanks,
Scott


Posted by Meat Plow on June 15, 2007, 2:00 pm
On Fri, 15 Jun 2007 14:18:31 +0000, infiniteMPG wrote:

>>>Still got carb problems.
>
> The carb is pretty simple, the only thing I didn't dig into was the
> float. When the top cap is removed the gasket is stuck to the bottom
> of the carb housing. The float mechanism seems mounted to something
> in the top half and something is under the gasket in the bottom half.
> So unless I scrap the gasket off and replace it I can't seperate the
> halves. Does this sound like float issues? Should the entire float
> mechanism be relaced or could it just be sticking?
>
> Sounds like a trip to the parts shop to get a gasket and a float or a
> complete rebuild kit. I checked and did not see ANY numbers or
> identifiers on the carb anywhere. How do you ask for a rebuild kit or
> float or would there just be one carb available on the 19.5hp 3672CN
> engine?
>
> Thanks,
> Scott

It could go by the make and serial number of the mower but you could
take the carb with you also. Sounds like the engine is dying because it's
starving for fuel (unless it makes black smoke) when the governor pulls
the throttle up and that could be a sign of low fuel level in the bowl
(float/needle valve problem) You probably should call the parts department
and ask the exactly what they need to look up a parts list for that carb.



Posted by infiniteMPG on June 15, 2007, 4:41 pm
> It could go by the make and serial number of the mower but you could
> take the carb with you also.

They wanted the stamped number off the engine block. I had the model
of the mower but no help as it's old.

>>Sounds like the engine is dying because it's starving for fuel (unless it
makes black smoke) when the governor pulls the throttle up and that could be a
sign of low fuel level in the bowl (float/needle valve problem) You probably
should call the parts department and ask the exactly what they need to look up a
parts list for that carb.

I would of checked the float out better but didn't have the
replacement gasket and the float is attached to the top part of the
carb housing and some of it extends below the gasket so I couldn't
remove it without scraping off the gasket. The local shop (and I
trust these guys) is open tomorrow 8-1 so I am running by there. Good
idea to bring the carb. Two bolts and it's in my hand. My Dad (who I
got the mower from) just told me that he thinks it's carbon buildup in
the heads and/or the exhaust system. I kind of doubt that as that
would cause it to run bad all the time and not just when going under
load. My hunch is pointing me towards the float as even when it
starts to die if I spray starter fluid (or dribble some gas) directly
in the carb it stays running until the fuel is used up. The float is
not in a seperate "bowl" with a releif spring screw plug in the bottom
like many small engines, it's in a machined out section of the bottom
housing and only has one hex plug in the side and no drain in the
bottom.

Thanks for the advice, I need it :O)
Scott


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