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Small Air Cooled Gasoline Engines

Broken FH exhaust valve


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  #1  
Old 03-15-2008, 09:47:42 AM
Alan R Alan R is offline
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Default Broken FH exhaust valve

Anyone have a solution for removing a stuck valve. I have been soaking it but no help. The engine shows very little rust but the valve is really tight. I thought it was turning, and instead I twisted off the top off the stem.

Are there any sources for a new or used valve?
Thanks,
Alan
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  #2  
Old 03-15-2008, 12:59:42 PM
Leonard Keifer Leonard Keifer is offline
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Default Re: Broken FH exhaust valve

Valves for FHs show up quite often on ebay or you could advertise in the parts wanted ads for one.

The key is patience. Spray it with your favorite penetrating oil (I've used diesel fuel, kerosene, and PB Blaster over the years). Let it sit and occasionally tap on the valve with a brass punch or small brass hammer, you don't want to mushroom the end of the valve stem that's left or you'll never get it out. You could try heating the head but I'm not sure how well that might work given the thickness of the head. I'm fairly certain there was a thread not long ago on the main Smokstak page about putting a whole head in a wood fire to get valves loosened up. You could search in Smokstak for it.
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Old 03-15-2008, 01:24:44 PM
Alan R Alan R is offline
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Default Re: Broken FH exhaust valve

Thanks, Leonard. Patience is often in short supply around here.
Still soakin'
Alan
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Old 03-15-2008, 08:13:34 PM
Leonard Keifer Leonard Keifer is offline
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Default Re: Broken FH exhaust valve

Alan, I have an FH piston with a hole in the top as a paper weight at work to remind me of the need for patience!
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Old 03-16-2008, 07:40:15 AM
briggsnut briggsnut is offline
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Default Re: Broken FH exhaust valve

I think you can make your own valve about as cheaply as buying one, you need a briggs and stratton exhaust valve part#211119 is very close spec size, this valve was used on 4 and 5hp older style aluminum model , you have to cut the stem to length and either reuse the keeper on top or pin it and add a keeper to top of spring, good luck
John
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Old 03-16-2008, 08:52:05 AM
Billy Boone Billy Boone is offline
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Default Re: Broken FH exhaust valve

When it comes to soaking very rusted parts, I have found out that brake fluid will work very good.
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Old 03-21-2008, 06:37:45 PM
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grega grega is offline
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Default Re: Broken FH exhaust valve

my fh intake valve guide is broke to ,but its aslant fin so il fix it as soon as i figure out how to do a perfect job
-greg
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Old 03-21-2008, 06:44:54 PM
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grega grega is offline
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Default Re: Broken FH exhaust valve

also a newer 3.5 in or 5 ex will fit. just need to reenginere the top of the valfe stem takes 5 to 25 minuts depending on if you plan to re use the keeperes
-greg
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Old 03-21-2008, 07:37:59 PM
James Wallace James Wallace is offline
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Default Re: Broken FH exhaust valve

Briggsnut, great suggestion, do you have a suitable replacement part # for an F series intake valve? I have 3 heads awaiting. My local machine shop says they can machine the groove in for the original exhaust keepers. Thanks, James in Wisconsin
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Old 03-22-2008, 07:19:17 AM
briggsnut briggsnut is offline
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Default Re: Broken FH exhaust valve

i could be wrong but I think the same exhaust valve can be used for both valves, using an exhaust valve as an intake valve should be no problem you just cant go the oppsite way with an intake valve,part #211119 is about as cheap as a valve to buy that i know of, someone else may have a better solution so it may not hurt to ask others im out of that # valve as far as I know
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