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post #1 of 26 Old 12-24-2014, 08:38 AM Thread Starter
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leaking valves?

What is the best and easiest way to diagnose a leaking exhaust valve on a tecumseh 8hp? I do believe that might be the problem with my engine since i can see glowing red inside of the muffler with occasional spitting out of bluish flames out of the muffler while using machine at night.
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post #2 of 26 Old 12-24-2014, 08:51 AM
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I'd say you've already diagnosed it. The valve hanging open is allowing still combusting hot gases to leak into your muffler and to burn there.You need to check your valve clearance soon. MH

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post #3 of 26 Old 12-24-2014, 08:56 AM Thread Starter
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That's what I was affraid the answer was going to be...
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post #4 of 26 Old 12-24-2014, 09:07 AM
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I just did 2 of my engines (HM80)...much easier than I anticipated. If your head bolts come out, then this job should be pretty straightforward. Order a new head gasket, breather gaskets and hit the auto store for a lapping tool, lapping compound and a feeler gauge. Seafoam + a nylon brush makes short work of the piles of carbon that you'll likely find!


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post #5 of 26 Old 12-24-2014, 09:10 AM Thread Starter
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Debating if this wouldn't be the way to go... depending on how much the valve lapping way would cost :/

7 HP 208cc OHV Winter Gas Engine | Princess Auto
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post #6 of 26 Old 12-24-2014, 09:31 AM
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Debating if this wouldn't be the way to go... depending on how much the valve lapping way would cost :/

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Reseating the valves might not be entirely necessary. You could try a seafoam decarb and see if the problem improves....I've always used the Tashasdaddy method. Wait for spring for a more extensive cleaning.


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post #7 of 26 Old 12-24-2014, 09:59 AM Thread Starter
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Only problem with waiting for spring, is this is my only machine. I might just soak up the head bolts over x-mas time and tackle that after the holidays.
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post #8 of 26 Old 12-24-2014, 10:07 AM
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Only problem with waiting for spring, is this is my only machine. I might just soak up the head bolts over x-mas time and tackle that after the holidays.
I'm with ya! What I'm saying is that you may be able to correct the gross problem by doing a simple seafoam decarb (you don't have to pull the head).

One warning, it smokes like CRAZY from all of that crud burning off!


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post #9 of 26 Old 12-24-2014, 10:13 AM Thread Starter
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Yeah, read the link you posted... can just see the curious bitter neighbors bitchin' hahaha. Thanks for the info, will mull on it and see what I do. My other neighbor offered me his honda in case of emergency. I huess it's Christmas after all hahaha.
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post #10 of 26 Old 12-24-2014, 10:23 AM
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Yeah, read the link you posted... can just see the curious bitter neighbors bitchin' hahaha. Thanks for the info, will mull on it and see what I do. My other neighbor offered me his honda in case of emergency. I huess it's Christmas after all hahaha.
Oh yes...'Tis the season of giving...and receiving!


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