Snowblower won't start - compression? - Snowblower Forum : Snow Blower Forums
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post #1 of 11 Old 02-03-2015, 10:36 AM Thread Starter
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Snowblower won't start - compression?

Hi all,
new to this forum and I hope someone can help.

I have a ~20 year old Noma snowblower, with Tecumseh 8 HP Snow King engine. Ran fine yesterday when I used it to clear 10" in driveway. Went out this morning to clean up, and it wont start:

Starter cord pulls too easily - no resistance. Doesn't turn engine over.

I plugged in the electric start - turns too easily, doesn't turn engine.

There is gas. I checked obvious things - starter key is in, oil level is OK (low, at "add" but not below that level).

I am thinking there is no compression. Any ideas of this, and cause, and what to do about it?

Thanks, any help appreciated.
Ted
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post #2 of 11 Old 02-03-2015, 10:51 AM
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i would guess a stuck valve, throw a 50/50 mix of mmo and diesel down the cylinder until it soaks the valve, if that doesnt work you may have to pull the head and GENTLY tap it free with a mallet
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post #3 of 11 Old 02-03-2015, 03:29 PM
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When you say "doesn't turn engine" is the piston going up/down? As in just the flywheel is spinning but nothing else? Broken key? Which would be unusual in a snowblower.
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post #4 of 11 Old 02-03-2015, 04:54 PM Thread Starter
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I cannot tell is piston is moving up and down - the starter cord pulls very easily with no resistance. No compression feel.
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post #5 of 11 Old 02-03-2015, 05:07 PM
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Remove the spark plug and look down the hole. If the piston and both valves are moving everything would be working properly. If the valves are moving, but not the piston then you have a broken rod. If the piston and 1 or 0 valves are moving then you have stuck valves. If nothing is moving then the starter isn't making contact.

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post #6 of 11 Old 02-04-2015, 07:26 AM Thread Starter
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Thanks for the suggestions. I will remove the spark plug and check, and report back what I find (may be a day or 2 from now)
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post #7 of 11 Old 02-09-2015, 08:50 PM
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I have the same motor on a snapper 8/24. Have noticed lately there is little resistance when pulling it to start. I put a compression tester on it cold and came up with a reading of 29 on the gauge. Called my local equipment shop and they said normal is 50-60 for that engine. It still runs and does its job but seems sometimes it struggles to start. Thinking it is time for a replacement motor
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post #8 of 11 Old 02-09-2015, 08:53 PM
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Quote:
Originally Posted by mr.finn View Post
I have the same motor on a snapper 8/24. Have noticed lately there is little resistance when pulling it to start. I put a compression tester on it cold and came up with a reading of 29 on the gauge. Called my local equipment shop and they said normal is 50-60 for that engine. It still runs and does its job but seems sometimes it struggles to start. Thinking it is time for a replacement motor
Sounds like you need a valve job. When the get old and hot the valves expand and don't close all the way.

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post #9 of 11 Old 02-09-2015, 09:08 PM
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Quote:
Originally Posted by mr.finn View Post
I have the same motor on a snapper 8/24. Have noticed lately there is little resistance when pulling it to start. I put a compression tester on it cold and came up with a reading of 29 on the gauge. Called my local equipment shop and they said normal is 50-60 for that engine. It still runs and does its job but seems sometimes it struggles to start. Thinking it is time for a replacement motor
How handy would you consider yourself there Mr.finn?

A valve job & new head gasket is fairly straightforward, an afternoon's worth of work and cheap (assuming that you don't have a scored/worn cylinder wall of course) and you'll have a like-new engine.
* wooden lapping tool & lapping compound
* feeler gauge
* torque wrench (up to 200 inch lbs)
* gaskets: head, muffler and breather
* A valve spring compressor isn't necessary but would make the job go even faster.


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post #10 of 11 Old 02-09-2015, 09:31 PM
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Agree with classiccat. Most likely valve(s) stuck in guide or chunk of carbon stuck on seats. Not a big deal to repair.
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