Valve Adjustment On Tecumseh 5hp - Snowblower Forum : Snow Blower Forums
 
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post #1 of 7 Old 02-27-2016, 03:36 PM Thread Starter
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Valve Adjustment On Tecumseh 5hp

I checked valve clearances today on my Tecumseh HSSK50 engine. The intake was .013 and exhaust had 0 clearance. I know I need to grind the exhaust valve to get the clearance. Specs for the intake side show .005-.007. Since I am at .013, how can I decrease clearance?
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post #2 of 7 Old 02-27-2016, 03:56 PM
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Maybe lap the valve

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post #3 of 7 Old 02-27-2016, 04:47 PM
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You probably need to have the valve edges ground, then lap it in, or get a new valve, lap it, then grind the stem to get final clearance. Old valve was probably ground too much in the past.

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post #4 of 7 Old 02-27-2016, 04:54 PM
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TBH, I wouldn't touch the intake clearance. Even if it's on the high-side you're not really hurting anything (besides giving up ~0.006" opening which isn't really going to affect power output) and have a bit of margin before valve-seat recession closes the gap down.

I'd be more worried as to why the exhaust gap has closed to zero. Check its valve seat for erosion/recession and its face for wear.
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post #5 of 7 Old 02-27-2016, 09:01 PM
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You might want to double check that you don't just have a tiny piece of carbon stuck under the intake valve.....
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post #6 of 7 Old 02-28-2016, 05:25 PM Thread Starter
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I just cleaned all around the valves, no more carbon. I am getting a valve spring compressor, then I will dig deeper.
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post #7 of 7 Old 03-05-2016, 11:33 AM
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Doug,
The valve springs are not very strong and compress easily. I didn't have a compressor when I did mine so I just used a needlenose pliers. Definitely easier with the right tool, but you can do it without one.
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