Tecumseh HMSK85 valve clearance - Snowblower Forum : Snow Blower Forums
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post #1 of 17 Old 11-05-2019, 06:49 PM Thread Starter
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Tecumseh HMSK85 valve clearance

Hey guys. I have a Tecumseh HMSK85 155905B and cant find the valve clearance spec anywhere. Does anybody know what it is supposed to be?

2000 Yard Machines 22" cut re-powered with 8.5hp flathead Tecumseh
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post #2 of 17 Old 11-05-2019, 07:01 PM
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I believe it is:

HMSK80, VM80, TVM195 (A-K), HM80 Min:.008 / Max.012 in.
.203 / .305 mm.

Same for HMSK100 so I assume same for HMSK85.
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post #3 of 17 Old 11-05-2019, 07:10 PM
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p64 of this doc says spec is 0.006", and usually is +/- 0.002".

http://www.smallenginesuppliers.com/..._reference.pdf

Paul
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1995 Toro 724, 1988 Toro 521
1980 Toro 421, 1995 Craftsman 524
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post #4 of 17 Old 11-05-2019, 07:48 PM Thread Starter
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Thanks for the replies!

I have seen both figures. So which one is correct?

2000 Yard Machines 22" cut re-powered with 8.5hp flathead Tecumseh
Tire Chains, Homemade Impeller Kit
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post #5 of 17 Old 11-06-2019, 07:30 PM Thread Starter
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Update:

I cleaned up the valves and checked the clearance and I am at 0.010 without lapping them.

If it is 0.008 - 0.012 then i am right in the middle. I am still waiting on gaskets but would like to hear from you guys before I button her back up!

2000 Yard Machines 22" cut re-powered with 8.5hp flathead Tecumseh
Tire Chains, Homemade Impeller Kit
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post #6 of 17 Old 11-06-2019, 07:41 PM
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I would go with what the manual calls out.

Paul
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post #7 of 17 Old 11-06-2019, 10:16 PM
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spec is .008 on intake and .012 on exhaust- this is what the tecumseh book at the shop says to use. if your engine is spiting flames out the exhaust or your muffler is glowing red hot and you have already tried to solve a lean condition this is more then likely your problem. now if you hear a pffting noise coming from the exhaust definitely look into the valves. more then half of them that come into the shop i work at have valve issues, but it is much more common on engines with fixed jet carbs
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post #8 of 17 Old 11-06-2019, 11:26 PM
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arienskids: where did you see that spec for the HMSK85? The only spec I have seen says 0.006 +/- 0.002". Also, the 0.008 and 0.012" spec is usually min max, not intake and exhaust.

Paul
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1980 Toro 421, 1995 Craftsman 524
1997 Toro CCR 2500 & 1994 Toro CCR Powerlite
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post #9 of 17 Old 11-07-2019, 12:42 AM
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The flat head Tecumseh manual-
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Toro 8/24 (38080) 1989
Toro 721-QZR (38743) 2015 (Hemi Predator Power)

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post #10 of 17 Old 11-07-2019, 06:00 AM Thread Starter
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Ok guys, this here is the issue I have found.


Has anyone followed one of these specs and can say that it worked for them? They vary quite a bit. Ironically i am at 0.010/0.010 right now (dead nuts between 0.008 - 0.012) and the machine runs fine. If it is in-fact 0.006 then i need new valves cause these have gone too far.

2000 Yard Machines 22" cut re-powered with 8.5hp flathead Tecumseh
Tire Chains, Homemade Impeller Kit
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