Tecumseh HMSK105-159915C help - Page 3 - Snowblower Forum : Snow Blower Forums
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post #21 of 62 Old 01-02-2018, 09:22 PM
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What did the rest of the stuff under the flywheel look like? Clean as the rest of the motor? Was thinking a rodent may have dragged some stuff up inside. Also did you shake the muffler after you took it off? Possible loose baffle.

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post #22 of 62 Old 01-02-2018, 09:29 PM
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Wha

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post #23 of 62 Old 01-02-2018, 09:35 PM Thread Starter
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A few days ago I read that carbon build-up can create a really loud rapping sound due to the minimal space of these flat head engines. Has anyone ever heard of this, or experienced it first hand on their Tecumseh. I really don't know what else it could be.
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post #24 of 62 Old 01-02-2018, 09:39 PM Thread Starter
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What did the rest of the stuff under the flywheel look like? Clean as the rest of the motor? Was thinking a rodent may have dragged some stuff up inside. Also did you shake the muffler after you took it off? Possible loose baffle.
Perfectly clean. No rodent problem. Yes, I did shake the muffler. Solid, no noise at all. On the tear down, all the nuts and bolts were tight. Not one was loose anywhere on the engine. I was hoping I would have found something loose. It would have been much easier.
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post #25 of 62 Old 01-02-2018, 09:40 PM Thread Starter
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What's the starter gear look like?

All intact.
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post #26 of 62 Old 01-02-2018, 10:00 PM
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A few days ago I read that carbon build-up can create a really loud rapping sound due to the minimal space of these flat head engines. Has anyone ever heard of this, or experienced it first hand on their Tecumseh.
No, not really. You would need a tremendous amount of carbon to cause a knock like you described and I see no evidence of it in your pictures.

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post #27 of 62 Old 01-02-2018, 10:46 PM Thread Starter
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No, not really. You would need a tremendous amount of carbon to cause a knock like you described and I see no evidence of it in your pictures.
Thanks

I'm going to clean everything up, order a gasket set, put it back together and see what happens. Thanks guys. I appreciate all the input.
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post #28 of 62 Old 01-03-2018, 06:40 AM
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I'm intrigued by the oversized piston (0.010"). It would suggest rebuild but you've had it since new.

The governor gear marring hopefully came from assembly when they tried to mesh it with the cam gear.

before slapping it together, make sure the governor spool / weights still move freely and as-intended.

the same goes for the compression release...it's only supposed to bump the exhaust lifter at low-speed.

i don't know if it's an optical illusion but is the left-side of the main journal damaged?



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post #29 of 62 Old 01-03-2018, 07:49 AM
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post #30 of 62 Old 01-03-2018, 08:16 AM
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What did you have for valve lash? I would check to see if a valve seat is loose. Did it rev right up to full rpm or just kind of chug when you tried to go full throttle?

Last edited by 351beno; 01-03-2018 at 08:22 AM.
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