My $18 10HP Tecumseh 30" craftsmen snowblower - Snowblower Forum : Snow Blower Forums
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post #1 of 14 Old 12-27-2019, 04:13 PM Thread Starter
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My $18 10HP Tecumseh 30" craftsmen snowblower

Ok guys, i bought this snowblower for $18, it is HUGE!! When I bought I was told they could not get it running and tried everything they could think of.. First carb was nasty so I put on a new one with a new gas line, it started right up after the 3 pulls, I let it run for a while and tried to make sure everything was in working order, GREAT everything works. The pull rope was wore so I replaced that and when I went to start it, it started to backfire and would not start. That was a year ago, so today I started to tear into it, I removed the head and the gasket was replaced by former owner and cleaned. I check the valves, intake was at.010 and exhaust was at .008. I reseated both valves and ground the exhaust to a .010 gap. I put everything back together, I know I need a new head gasket but still wont fire up. When I was checking the valve gap and getting the piston to TDC , I noticed the exhaust valve would open a little and close before TDC. Any thoughts? Thanks
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post #2 of 14 Old 12-27-2019, 04:21 PM
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Check the flywheel key, it may have sheared. Does it back fire, or difficult to pull the rope? Have you checked for spark, also?




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post #3 of 14 Old 12-27-2019, 04:30 PM
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is that slight exhaust valve lift part of the compression release system? this guy has pretty good videos on Tecumseh engines.


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post #4 of 14 Old 12-27-2019, 04:42 PM
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Quote:
Originally Posted by paulm12 View Post
is that slight exhaust valve lift part of the compression release system? this guy has pretty good videos on Tecumseh engines.
That would be my guess, that you're seeing the compression release operate.

Great deal on the machine! It's had some work done, but I'd start by treating it like any engine that won't start. You need fuel/air, compression, and spark (at the right time).

If you spray some gas or starting fluid into the carb, will it run for a few seconds? Do you have a good bright spark? Assuming you have compression, if none of those will make it run, then I'd check the flywheel key, to make it's not sheared, which would mess up your ignition timing.

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post #5 of 14 Old 12-27-2019, 04:46 PM Thread Starter
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Yes nice bright blue spark, it will NOT start on starting fluid. I tried checking compression, it would go up to 120 with the electric start... Thanks everyone, I will check the key tomorrow
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post #6 of 14 Old 12-27-2019, 06:23 PM
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That sounds weird, should fire. Did the previous do anything to it?
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post #7 of 14 Old 12-27-2019, 06:28 PM
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Well if you have spark I'm thinking fuel. Starting fluid should get it run for at least a couple of seconds. Hmmm!

Just thought of this. You said you have nice spark. How? The plug lead disconnected and grounded out to the head with some clearance? Or the actual spark plug removed and observed sparking?
What I mean is everything could be good and the installed plug is bad!

Last edited by dcinma; 12-27-2019 at 06:32 PM.
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post #8 of 14 Old 12-27-2019, 07:00 PM
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Quote:
Originally Posted by Motor City View Post
Check the flywheel key, it may have sheared. Does it back fire, or difficult to pull the rope? Have you checked for spark, also?
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AND IT DOES NOT, DOES NOT NEED TO BE SHEARED! A well kept secrete around here by repair shops that repair lawnmowers is a key that is just slightly bent from the blade hitting a rock. And the machines have spark when tested but will not start! Because of the slight shift in the flywheel in relationship with ignition points the spark intensity is compromised. And also remember, when one tests for spark they SHOULD do it with the spark plug removed, body of the plug held tightly against the engine casting prior to rotating the crank shaft.

OH and a spark at high pressure inside a combustion chamber needs a higher voltage for an arc than that seen when checking for a spark with the plug removed. While I am at it, a warning about checking for spark. NEVER check the spark with the spark wire not connected to a plug. The plug’s gap determines how high the spark voltage can rise to. The spark voltage can soar very high above that voltage limited by the spark plug. The higher voltage commonly causes the high voltage transformer to fail.
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post #9 of 14 Old 12-27-2019, 07:51 PM Thread Starter
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Originally Posted by dcinma View Post
That sounds weird, should fire. Did the previous do anything to it?
The case looks as it was never touched. I tested for spark with the plug removed and touching the top metal. I couldn't find my spark tester today go figure
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post #10 of 14 Old 12-27-2019, 08:32 PM
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Having a spark is half the battle. Having it occur at the right time is the other. If the PO was into the head gasket he may also have futzed with the flywheel to check the ignition components and forgot/lost the key and/or didn't tighten the flywheel nut sufficiently and the key is now sheared & the flywheel out of time.

Last edited by Blackfin; 01-02-2020 at 10:09 AM.
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