The Ford Barn

lotsagas4u · 07-06-2018, 02:46 PM

How are valve seats cracks repaired? Have a early engine with 1 cracked valve seat, the crack goes to the edge of the cylinder. Are these normally welded? The crack does not go down into the cylinder. I do not have the valve out. It is a 36LB engine, thanks

rotorwrench · 07-06-2018, 04:14 PM

Most machine shops pin them with Irontite cast iron threaded taper pins or Lock & Stitch methods. Cast can be welded but it takes a lot of heat to fusion weld a block. This is a specialty trade and they mostly work on unobtanium type antique stuff. Most shops recommend a sleeve to reinforce a cylinder wall that is on a repaired area due to warranty possibilities. This link to You-Tube gives some info. https://www.youtube.com/watch?v=Y7dDZgflHKw

Frank Miller · 07-07-2018, 06:58 AM

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What rotor wrench said but you also machine for a new valve seat. You need to make sure the crack does not go into the valve chamber. Not saying that cannot be fixed but it gets more difficult. There is a guy near me who can stitch most anything. Works out of his house. I was there one time and he was repairing a Delahaye block with the side blown out of it.

07-06-2018, 02:46 PM	#1
lotsagas4u Senior Member Join Date: Apr 2011 Location: Plainview, Texas Posts: 757	Valve seat crack???? How are valve seats cracks repaired? Have a early engine with 1 cracked valve seat, the crack goes to the edge of the cylinder. Are these normally welded? The crack does not go down into the cylinder. I do not have the valve out. It is a 36LB engine, thanks

07-06-2018, 04:14 PM	#2
rotorwrench Senior Member Join Date: Jun 2010 Location: San Antonio, Texas Posts: 16,440	Re: Valve seat crack???? Most machine shops pin them with Irontite cast iron threaded taper pins or Lock & Stitch methods. Cast can be welded but it takes a lot of heat to fusion weld a block. This is a specialty trade and they mostly work on unobtanium type antique stuff. Most shops recommend a sleeve to reinforce a cylinder wall that is on a repaired area due to warranty possibilities. This link to You-Tube gives some info. https://www.youtube.com/watch?v=Y7dDZgflHKw

07-07-2018, 06:58 AM	#3
Frank Miller Senior Member Join Date: May 2010 Location: Auburn, MA Posts: 2,106	Re: Valve seat crack???? Sponsored Links (Register now to hide all advertisements) What rotor wrench said but you also machine for a new valve seat. You need to make sure the crack does not go into the valve chamber. Not saying that cannot be fixed but it gets more difficult. There is a guy near me who can stitch most anything. Works out of his house. I was there one time and he was repairing a Delahaye block with the side blown out of it. __________________ “The technique of infamy is to start two lies at once and get people arguing heatedly over which is true.” ~ Ezra Pound