Tecumseh valve gap question - Snowblower Forum : Snow Blower Forums
 
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post #1 of 9 Old 02-03-2019, 03:17 PM Thread Starter
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Tecumseh valve gap question

Doing my first valve work on these engines and all went well except when I ground the valve I went a little heavier than I thought, The gaps in the Tecumseh service manual say .008 on intake and .012 on exhaust but the exhaust now takes the .016 and .017 can be pushed in, I know it's the size of a human hair too much but how much will this effect the engine not opening that hair as far. Let me know because I want to get this put back together and onto the next machine so I can clear out the garage some.

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post #2 of 9 Old 02-03-2019, 03:47 PM
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It won't open as far, but should be alright.
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post #3 of 9 Old 02-03-2019, 03:48 PM
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what engine model is it? are you sure the spec is not 0.008" to 0.012" on both? Most of the older Tecumseh have same valve clearance for both.

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post #4 of 9 Old 02-03-2019, 03:50 PM
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Experience is what you get, when you don’t get what you want....
That happened on my first valve job. It was noisy. Didn’t seem to affect performance too much..... but I knew it was wrong and got tired of listening to it. So 3 weeks later, I got a valve and did it over..... much more carefully than the first time.

GLuck, Jay
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post #5 of 9 Old 02-03-2019, 04:17 PM
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Did you lap the valves before or after grinding the valve stem? If you didn't lap them after, there is a real good chance the clearance will decrease after lapping.

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post #6 of 9 Old 02-03-2019, 04:32 PM Thread Starter
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Was going to skip the lapping as this is more a learning job (NOT a customers machine but a beater I picked up) But now decided to lap them, Just need to get the right stuff to do it, Not in a rush but DO want to get my garage cleared out a little LOL Thanks for all the quick responses.

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post #7 of 9 Old 02-03-2019, 05:16 PM
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Too much clearance is at least safer than too-little. With too much, at least the valve will seal completely. But if that's the valve with the compression release, then you'd give up a bit of compression release, so it might be a harder to pull the cord.

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post #8 of 9 Old 02-03-2019, 08:38 PM Thread Starter
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its the exhaust valve, Will test it out and if it's too much of a issue I will pull a valve from one of the many parts engines, Will be giving this to a friend after it's running so good learning for me anyway, Not hard to do but just got to be careful.

Sno-Tek Modded, 15"X-Track tires (Now has same X-Track tires but 13"x4" for better fit), 254cc engine LED light and hand warmers.
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post #9 of 9 Old 02-05-2019, 11:28 AM
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Too little clearance can lead to burnt valves...
Too much, noise and some mostly theoretical (for these engines) loss of HP.
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