Abby’s Guide > Outdoor Power Equipment (Lawn Mowers, Snow Blowers, Chain Saws and more) > Discussions > Tec 7-hp Over-Head Valve pulls back on Starting
Outdoor Power Equipment (Lawn Mowers, Snow Blowers, Chain Saws and more) Discussions |
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edgenet
If you enjoy doing it, It's not work
Location: Toronto
Joined: Nov 27, 2010
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Tec 7-hp Over-Head Valve pulls back on Starting
Original Message Feb 2, 2011 11:47 am |
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I have a snowblower with a TEC 7-hp over head valve engine that pulls the pull cord like it has a broken fly wheel key. I have seen this on many lawnmowers but never on a snowblower engine. The engine runs nice once started. Is this possible.
This message was modified Feb 2, 2011 by edgenet
If you are getting paid for what you are doing No matter how much you Enjoy it, It's a Job
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edgenet
If you enjoy doing it, It's not work
Location: Toronto
Joined: Nov 27, 2010
Points: 84
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Re: Tec 7-hp Over-Head Valve pulls back on Starting
Reply #5 Feb 2, 2011 4:30 pm |
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Yes is possible. I had a problem with the pull start on my 2006 Ariens 11528LE (Tecumseh OHV engine) immediately after I bought it. The cord would pull halfway out then snap back with enough force to break off the bottom of the handle. I was literally left holding the other half of the handle. Call Ariens and they said it was a Tecumseh warranty issue and to call them. Took it to an authorized Tecumseh dealer. It took them forever to fix it because they had to consult with Tecumseh for direction. This was back when Tecumseh was still around. To your question though...before I got it fixed I began using the electric start and once the engine was running it worked flawlessly. But even after running it for a while if I would would shut it off and then try to restart it using the pull cord it would snap back on me. The Tecumseh shop never explained to be what was broke, but they did fix it...knock wood it's been fine ever since.
Paul you described it perfectly that is what is happening wish the guys told you what the fix was. I will look at the flywheel key.
If you are getting paid for what you are doing No matter how much you Enjoy it, It's a Job
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friiy
Location: Las Vegas, The Desert
Joined: Apr 12, 2008
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Re: Tec 7-hp Over-Head Valve pulls back on Starting
Reply #6 Feb 3, 2011 1:07 am |
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Check the Valve Clearance.... Most likely the valves are too loose... If they get too loose the Compression release lobe on the cam will not have any affect and the engine will snap back the pull rope on the compression stroke...... Seen it a million times, it is really bad on the Vangard OHV engines Briggs has, but not uncommon on the Tec Engine too... Let me know what you find... Good Luck, Friiy |
edgenet
If you enjoy doing it, It's not work
Location: Toronto
Joined: Nov 27, 2010
Points: 84
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Re: Tec 7-hp Over-Head Valve pulls back on Starting
Reply #7 Feb 3, 2011 10:08 am |
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Check the Valve Clearance.... Most likely the valves are too loose... If they get too loose the Compression release lobe on the cam will not have any affect and the engine will snap back the pull rope on the compression stroke...... Seen it a million times, it is really bad on the Vangard OHV engines Briggs has, but not uncommon on the Tec Engine too... Let me know what you find... Good Luck, Friiy You were correct after adjusting the valves all is well. Thanks for the input.
If you are getting paid for what you are doing No matter how much you Enjoy it, It's a Job
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borat
Joined: Nov 10, 2007
Points: 2692
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Re: Tec 7-hp Over-Head Valve pulls back on Starting
Reply #10 Feb 4, 2011 10:30 pm |
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Borat ------ When the valves heat up and the clearance tightens the motor will be easier to start. (compression release will engage slightly).... Anything that is overhead valve is prone to this problem, I would always check valve lash on something with this problem before checking the flywheel key on anything with a belt PTO.. Friiy I agree that it will be easier to turn over because the valves aren't completely closing if the lash is too tight. The down side of that is the valve never completely close thus allowing a portion of the combustion process (flame/gases) to escape causing excessive heat and damaging valves. In some circumstances, if the valve lash is tight enough to compromise compression too much, the engine may be difficult to start.
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edgenet
If you enjoy doing it, It's not work
Location: Toronto
Joined: Nov 27, 2010
Points: 84
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Re: Tec 7-hp Over-Head Valve pulls back on Starting
Reply #13 Feb 6, 2011 4:03 pm |
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Ive experienced this numerours times with Honda engines on cement mixxers and power washers. Many times it would pull back so hard one time spraining my wrist. Many other times shattering the plastic t-handle. I was told by the repair shop that there was too much carbon build-up on the piston. Not sure if its true or not. The 1st thing I would do is check the valve adjustment before anything else. Not sure but I think Honda says to check the valves after 30 hours of running time and then 100 hours after that. You as a user should always change the oil every 40 hours and make sure you install a new air filter at least every 12 months in your case maybe sooner due to the cement blowing around the engine.
If you are getting paid for what you are doing No matter how much you Enjoy it, It's a Job
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