Muffler glowing red - Snowblower Forum : Snow Blower Forums
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post #1 of 14 Old 11-12-2015, 12:17 PM Thread Starter
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Muffler glowing red

Hi Gang-

Need some advice from the experts. Tecumseh 8 HP engine early 90s vintage. (not mine) when I was doing some fine tuning of the carb earlier this year, I could see the muffler start to glow red, but with a few changes to the carb adjustment it would go away. I ended up rebuilding the carb recently and the machine runs much better, but have not yet ran it at night to see if it gets the muffler hot enough to start glowing.

Thoughts on why it would glow in the first place? Just the mixture not being set correctly? The muffler seems to be in good shape otherwise and the machine is stored inside a shed and has been since they purchased it. Gasoline is always fresh and the fuel shut off is always turned off after done with the snow blowing, allowing the engine to die once it's used up all the fuel in the line and carb.
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post #2 of 14 Old 11-12-2015, 12:37 PM
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Quote:
Originally Posted by GoBlowSnow View Post
Hi Gang-
Thoughts on why it would glow in the first place? Just the mixture not being set correctly?
When the muffler glows it means it is running lean but a little glowing in the dark is no cause for alarm. So if you can adjust it so it doesn't glow just don't go to the rich side too much where you will gum up the spark plug hence having hard starts.

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The 15 HP is a new Ducar engine sold
by Princess Auto in Canada.
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post #3 of 14 Old 11-12-2015, 01:06 PM
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If the machine has been in a shed for any amount of time it might be worth verifying that there isn't mouse nest under the flywheel shroud.

A nest would restrict cooling air and cause the engine to run hot.

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post #4 of 14 Old 11-12-2015, 01:07 PM
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Take the muffler off and check it. Mine did that and it had rusted internally and had a loose part that you could hear when shaken. You may also have a bad gasket.
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post #5 of 14 Old 11-12-2015, 01:56 PM
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Quote:
Originally Posted by Normex View Post
When the muffler glows it means it is running lean but a little glowing in the dark is no cause for alarm. So if you can adjust it so it doesn't glow just don't go to the rich side too much where you will gum up the spark plug hence having hard starts.
+1 on this

Joe

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post #6 of 14 Old 11-12-2015, 02:40 PM
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Are the revs per minute within specs??????????????????????

Long LIVE THE POWERSHIFT!! MAY IT NEVER RUST IN PEACE!!
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MAHALO!!!!!!!!!
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post #7 of 14 Old 11-12-2015, 05:58 PM
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Quote:
Originally Posted by GoBlowSnow View Post
when I was doing some fine tuning of the carb earlier this year
Don't forget, these are air cooled motors with extra shielding designed to be run in colder temperatures. Tuning a snow engine when it is 80 or 90 degrees out will have some effect on the engine and I agree with Norms assessment.

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post #8 of 14 Old 11-12-2015, 09:52 PM Thread Starter
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Thanks for the input. I will pull the muffler this weekend and have a look. I will also give a good look around for any signs of a nest.

Regarding the tuning of the engine, very good point there too, thank you. It was running very nicely when I gave her a little trial run Wednesday morning after we got a few inches of snow Tuesday night into Wednesday.

PowerShift- you asked: Are the revs per minute within specs??????????????????????

I would not be surprised if they are not within spec. Having never done this before, what would be the best way of checking the revs? I can certainly look up what the specs would be online for that year/model, but not sure how to check the revs? Never done that before.

thank you!
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post #9 of 14 Old 11-12-2015, 10:06 PM
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Quote:
Originally Posted by GoBlowSnow View Post
I would not be surprised if they are not within spec. Having never done this before, what would be the best way of checking the revs? I can certainly look up what the specs would be online for that year/model, but not sure how to check the revs? Never done that before.
Here's a few that you can purchase. Normally a snow blower rpm when at full throttle is 3,600 rpm.
Good Luck
Small Engine Tachometer | eBay

Snow Removal Apparatus I own:
Ariens ST1530DLE, and good ole arm powered scrapper.
The 15 HP is a new Ducar engine sold
by Princess Auto in Canada.
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post #10 of 14 Old 11-12-2015, 10:55 PM
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could also be an exhaust valve issue
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