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post #1 of 23 Old 02-11-2017, 12:24 PM Thread Starter
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Can't figure it out

Hi all, need someone's help or at least keep me honest.
I bought a used Murray 22 inch snowblower, maybe 15 years old, with a 5 hp tecumseh hssk50 engine, that dies under load. Seems to run fine, but in deep snow stalls, which is what I want it for, it bogs down and will stall. I have done the following:
Replaced gas and the carb with a non oem carb. Fixed valve lash at .004 inches for both intake and exhaust. I did not lap the valves. I also , cleaned head and replaced head gasket, and torqued to specs, 200 inch lbs. Compression is 80 psi. Key is not sheared, what am I missing?
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post #2 of 23 Old 02-11-2017, 12:46 PM
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Hi all, need someone's help or at least keep me honest.
I bought a used Murray 22 inch snowblower, maybe 15 years old, with a 5 hp tecumseh hssk50 engine, that dies under load. Seems to run fine, but in deep snow stalls, which is what I want it for, it bogs down and will stall. I have done the following:
Replaced gas and the carb with a non oem carb. Fixed valve lash at .004 inches for both intake and exhaust. I did not lap the valves. I also , cleaned head and replaced head gasket, and torqued to specs, 200 inch lbs. Compression is 80 psi. Key is not sheared, what am I missing?
That machine is not really suited for anything over 4-5 inches of snow. I know this from past dealing with it a very long time ago. so if your bank roll can do it. be honest with yourself and find something bigger and better, anyhoo ALOHA from the Paradise City.

Long LIVE THE POWERSHIFT!! MAY IT NEVER RUST IN PEACE!!
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MAHALO!!!!!!!!!
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post #3 of 23 Old 02-11-2017, 12:49 PM
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to SBF Bigbmn

How much snow are you talking about and is it fluffy or packed like from a snow plow and what speed are you running the machine into it in ??

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post #4 of 23 Old 02-11-2017, 01:21 PM Thread Starter
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I'm not yet sure what rpm the machine is running at, and purchased an inexpensive laser rpm meter to check. The snow I was trying to clear was 8 to 10 inches of snow plow snow. Just didn't think the machine should bog down like that
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post #5 of 23 Old 02-11-2017, 03:35 PM
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Quote:
Originally Posted by Bigbmn View Post
I'm not yet sure what rpm the machine is running at, and purchased an inexpensive laser rpm meter to check. The snow I was trying to clear was 8 to 10 inches of snow plow snow. Just didn't think the machine should bog down like that
not the engine speed, the speed (the gear) you're using to drive the machine, my guess is you're not going to be able to use anything above first gear with that small a machine and 8-10" of snow. IMHO slow down and enjoy the blow!
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post #6 of 23 Old 02-11-2017, 03:44 PM
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80psi compression is kind of low. Before you adjusted the valve lash was the engine popping badly out of the exhaust? If so,adjusting valve lash alone might not have been enough and valve lapping might have been required.

It can't hurt to add some oil to the cylinder through the spark plug hole and recheck compression. Maybe your rings are just really worn, and the engine is plain old tired.

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post #7 of 23 Old 02-11-2017, 04:19 PM Thread Starter
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I never thought about adding oil and checking compression again. Everything I've read said it was difficult to accurately test compression, since these engines have a compression release to allow easier starting. To me, this machine was big enough for my small property, and I can't imagine it was used that often over its lifetime. Maybe I was expecting too much, and Yes I did have it in a high gear to go through some of the snow faster
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post #8 of 23 Old 02-11-2017, 06:56 PM
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With an older 5 horse 22" going into the EOD pile about first gear is all you can hope for and you might need to stop a couple times to let it catch up even in first. I know my newer Troy still needs a little help getting through the EOD pile.

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post #9 of 23 Old 02-12-2017, 06:51 AM
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My Toro 521 had the same/similar engine. I found that the fuel mixture had to be a bit on the rich side in order for it to hold up under load. Even then, it needed to go slow through the snow banks, by pulsing the drive lever.

So, I'm not sure how fast you are trying to go through stuff, but maybe it is too fast. 5 HP for a 22" is kind of on the low end. You should be able to go through deep snow (12", etc.), just not in anything more than first gear.

So, I would set the fuel mixture a tad rich and see if the machine can keep up with a slower going.

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post #10 of 23 Old 02-12-2017, 07:53 AM Thread Starter
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Thanks for all the posts. It was a good project for me, to get this machine to run again. It seems my expectations were too high, thinking thjs two stage would devour snow. I'm all for tweaking as much out of it as possible. This new carb doesn't have any adjustments that I know of. How can I run rich?
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