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Old 11-15-2021, 09:36 AM   #1
Ratchet
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Default Badly worn Valve guides

Hi,

I have a 1926 "T" with badly worn valves, guides and exhaust seats and I am wondering if anybody has recommendation for replacement valve guides, valves and seats?

Are model A two piece guides an option?

Thanks

James
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Old 11-15-2021, 10:51 AM   #2
Will N
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Default Re: Badly worn Valve guides

I do not believe that the T engine has replaceable valve guides. Venders sell valves with oversized shafts and reamers to make them fit the worn guides.
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Old 11-15-2021, 11:18 AM   #3
Ratchet
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Default Re: Badly worn Valve guides

Thanks Will

I was hoping somebody had a work around!

James
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Old 11-15-2021, 07:07 PM   #4
rotorwrench
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Default Re: Badly worn Valve guides

Langs has .015" oversize and .030" oversize valves. A person would need the reamer and reamer guide bushing for each size needed to center ream the old guide. A machine shop could likely set the block up to align bore the old guides as well as long as they have the equipment to do it. If the worn guide bore isn't too far off center then the reamer may work without a guide bushing.

Broken guides can be replaced with cast iron but it may require fabrication by the machinist doing the job. Some T motors had replaceable guides but not all that many from what I understand.

Some rebuilders may install valve guide sleeves instead of oversized valves.

Last edited by rotorwrench; 11-15-2021 at 07:16 PM.
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Old 11-16-2021, 04:43 PM   #5
Ratchet
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Default Re: Badly worn Valve guides

Thank you for the information I will have a look at Langs web site.
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Old 11-28-2021, 09:22 PM   #6
Ratchet
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Default Re: Badly worn Valve guides

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Well as it turns out the valves in my 1926 have been in the past, all 4 exhaust valves have oversized stems and are one piece valves unlike the intake valves are two piece. Is there anyway to increase the oil for the exhaust valves to reduce valve stem/ guide wear?
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Old 11-29-2021, 08:19 AM   #7
rotorwrench
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Default Re: Badly worn Valve guides

Run some Marvel Mystery oil additive in the fuel. There are instructions for mixing on the product container. MMO was and still is used in many old airplanes that use the small Continental 4-cylinder engines to prevent valve problems.
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Old 11-29-2021, 03:49 PM   #8
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Default Re: Badly worn Valve guides

Check Lang's, there are 3 sizes of standard type valves along with the modern replacement type valve that uses the standard valve spring retainer clips.
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