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About two weeks ago, suddenly my mower (Toro model 20334 -- 3100...) became much louder. Is there a muffler replacement that can be done? It is also running faster as soon as this happened so perhaps something else. Right now -- even with earmuffs, hard to stand the noise.

Also -- in looking at the parts diagram -- I only see a muffler shield -- what is the part number for the muffler itself and is this something easily replaced?
Thanks.

You have an eight year old unit with a Briggs & Stratton engine. The muffler is part of the engine and can be found using the engine numbers. I would say you should what is causing the engine to run faster, as this will cause an increase in how loud the unit sounds. I don’t ever remember replacing a muffler on one of these engines.

Yes -- replacing muffler does not help. And you (Rivets) are correct -- problem seems to be that mower is running at full speed and cannot modify this as is automatically adjusted on this unit. Right underneath muffler is a 593208 Briggs and stratton thermostat for auto choke style engines. Could that be bad or is there some way to adjust the throttle speed on these units?

I highly doubt the the automatic choke is causing the problem. If you feel that the engine is running to fast, then you will have to adjust it to the proper speed. I normally set the speed at 3100 RPMs. I can’t find a manual which shows how to adjust these exact engines, but if you look through this manual, carbs and governors, you will find setups very similar to what you have. Using the info for the different setups you should be able to adjust the speed. Leave the choke system alone, has nothing to do with speed. Come back with specific questions if you need to. Someone will be able to help you out.
https://drive.google.com/file/d/0B6NaqjIxWV1ycG8wd0s3Z2Q2X00/view

nova said:

About two weeks ago, suddenly my mower (Toro model 20334 -- 3100...) became much louder. Is there a muffler replacement that can be done? It is also running faster as soon as this happened so perhaps something else. Right now -- even with earmuffs, hard to stand the noise.

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Don't run that engine anymore......... You gonna throw a rod or something is gonna let loose in your engine .....

I am very familiar with your engine if you have the one I am thinking of........ A 6.75 Briggs is the one I am thinking of...

Those are the ones that came with the auto choke EZ start style....... is it the 126M02 or similiar ?????

I am thinking that you might have a governor issue......... It might have let loose inside your engine or your linkage got hung up some kind of way...... ?????

If your gov let loose then that's a easy fix...........

Let us know Mon Ami ~!~!

Yes -- was thinking might be a governor issue as the increased speed happened suddenly as if something came loose -- how can this be checked? I found what is called the governor spring, which seems fine -- not sure what else is needed. Also -- model number of the engine is 128T05-3123-B1 -- unit is about 8 yrs old. Toro mower is automatic choke electric start. When you start now runs a bit rough for about a minute -- then the speed increases to max and is loud.

nova said:

Yes -- was thinking might be a governor issue as the increased speed happened suddenly as if something came loose -- how can this be checked? I found what is called the governor spring, which seems fine -- not sure what else is needed. Also -- model number of the engine is 128T05-3123-B1 -- unit is about 8 yrs old. Toro mower is automatic choke electric start. When you start now runs a bit rough for about a minute -- then the speed increases to max and is loud.

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Take the cosmetic cover off and the air filter box..... Then you will have access to the throttle on the carb........

Start the engine and if it runs away with you then put your fingers on throttle control at the carb....... See if you can control the speed like that....... You should be able to do that, you have a mechanical gov on that engine compared to a air gov on the small classics........

Like I said earlier it's a easy fix and cheap to .........

Let us know Mon Ami ..........

Boudreaux In Eunice La. said:

Take the cosmetic cover off and the air filter box..... Then you will have access to the throttle on the carb........

Start the engine and if it runs away with you then put your fingers on throttle control at the carb....... See if you can control the speed like that....... You should be able to do that, you have a mechanical gov on that engine compared to a air gov on the small classics........

Like I said earlier it's a easy fix and cheap to .........

Let us know Mon Ami ..........

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Looked at gov situation -- sent pictures by gmail to you -- anyway cleaned up around gov and still running very fast -- looks to be inside unfortunately, replacing probably beyond my abilities -- will see if any videos that can help with this.

nova said:

Looked at gov situation -- sent pictures by gmail to you -- anyway cleaned up around gov and still running very fast -- looks to be inside unfortunately, replacing probably beyond my abilities -- will see if any videos that can help with this.

Click to expand...

-- and yes you can slow down manually but that is not much help.

Finally got the email....... Ok here's a parts list......

691997 Governor 16 bux
399781S Seal 4 to 5 bux
692232 Sump gasket 4 bux

You can get these at your local lawn mower repair shop or order from Pro Parts direct.net Call their toll free number and talk to Ed.... Tell em Boudreaux in Louisiana sent you.... They know me there....

Let us know Mon Ami ~!~!

Nova here is the video you wanted to see..... I am overhauling a engine right now like yours so here's your info ....

https://youtu.be/tqQQ618XeiE

Boudreaux In Eunice La. said:

Take the cosmetic cover off and the air filter box..... Then you will have access to the throttle on the carb........

Start the engine and if it runs away with you then put your fingers on throttle control at the carb....... See if you can control the speed like that....... You should be able to do that, you have a mechanical gov on that engine compared to a air gov on the small classics........

Like I said earlier it's a easy fix and cheap to .........

Let us know Mon Ami ..........

Click to expand...

Watched the video and does not look too bad -- will give it a try -- probably in January as pretty much done with the mower for this year. Thanks again -- also for the part numbers as well -- hopefully the weights that you were talking about have not done too much damage.

Also -- in video -- so governor simply slips off of the cam shaft? What keeps it in place when the new one is put on? I assume it is held in place in that there is nowhere for it to go?

nova said:

Also -- in video -- so governor simply slips off of the cam shaft? What keeps it in place when the new one is put on? I assume it is held in place in that there is nowhere for it to go?

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As i pointed out in the video the sump / crank cover holds it in place.......... In fact when I put this thing back together I will point that out and show how to put the sump back on...

I am doing a whole series of videos on this project...... about 8 videos all in all..........

Plus Tard Mon Ami ~!~!

Edit....... Yes the gov just slips on and off just like in the video .......

Edit Encor'e ......... Before you order any parts take the sump and make sure there is no damage nowhere inside.... The only damage you might have is gonna be the teeth on the cam gear and timing gear on the crankshaft... That gear just slides right off and can be replaced in 2 seconds if that LOL......

The cam is not that pricey and is worth replacing if the teeth are bad...... Inspect the lobes and see if they are good.....also the ACR on the cam... You can get by without the ACR just a lil harder to pull the starting rope.......

Am about to replace the governor on my toro mower -- Briggs and stratton engine. I have reviewed the video that Boudreaux In Eunice La added and looks straightforward. I purchased the parts you recommended and am ready to give the replacement a try. I did have some questions -- (1) do I need to unhook everything on that is hooked up to the engine and have the engine completely away from the mower body? I would assume so but wanted to check. (2) do I need to do anything on top of the engine -- remove the starter belt assembly, etc?

for some reason I got the Email this morning..... I have talked on the phone with him and he's got the engine repaired and back together....

Waiting on oil to put in it and fire it up.............

Plus Tard Mes Amies ~!~!

Started today and mower working perfectly. Old governor was clearly broken and replacement well described in video.

Thank you Boudreaux In Eunice La for your help!

Mower as mentioned running well after governor replacement but is now using oil -- need to add with each mowing. Perhaps I did not put in gaskets properly?
Suggestions?