Cracked Head

[TMcNam4510@aol.com]

The (mis)adventure continues...........The shop that is rebuilding the engine has shown me that the exhaust valve seat in number 2 cylinder has a hairline crack in it. Even if they cut out enough material to accomadate a hardend seat, the crack will remain. My questions to the group are; does anyone have experience in sucessfully welding such a crack? Will the new hardened, pressed in seat stay put if the repair is atempted? Are there any rebuildable heads available? If so at what cost? As ever, thanks for the replys, this knowledge base is awesome. Regards, Tom, TC2850 [Non-text portions of this message have been removed]

[Diecuts@aol.com]

Hi Tom, There is a company called Metal Stitch, Lock-n-Stitch or close to it that specializes in ways to repair cracks without welding. I have used their product to repair a crack on a SA block and it was straightforward and easy. They have a video to show how heads are repaired and even show the exact crack and repair that you are describing. Cost is initially a little high for the drills, taps, etc but for around $200 you can do it yourself and have stuff leftover for any other surprise cracks. Look them up on Google. Cheers, Lee Jacobsen, Dearborn, MI TA2969 tickford [Non-text portions of this message have been removed]

[Jeff Redman]

G'day Tom, Hate to say it mate... but I think you now have a new door stop! I've forgotten whether your cyl. head is round hole or banana water passages. Cracks in the latter are unusual but common in the former. Academic here, really Recently I floated a request for repair info on behalf of mate with several TF heads with a similar cracks, just in case new technology had emerged. No luck There are quite a few respected engine reconditioners down here, with technical expertise as good as any on the international scene. When contacted all were of the same opinion... if it's cracked through the valve seat then its buggered. Fitting hardened seats in this situation is Russian Roulette. Metal stitching/ welding on blocks, as suggested elsewhere, is a vastly different proposition to attempting repairs to the combustion chamber. A fresh head is the only (safe) option. Good luck mate. Reddo -----Original Message----- From: mg-tabc@yahoogroups.com [mailto:mg-tabc@yahoogroups.com] On Behalf Of TMcNam4510@aol.com Sent: Saturday, 21 May 2005 12:29 AM To: mg-tabc@yahoogroups.com Subject: [mg-tabc] Cracked Head The (mis)adventure continues...........The shop that is rebuilding the engine has shown me that the exhaust valve seat in number 2 cylinder has a hairline crack in it. Even if they cut out enough material to accomadate a hardend seat, the crack will remain. My questions to the group are; does anyone have experience in sucessfully welding such a crack? Will the new hardened, pressed in seat stay put if the repair is atempted? Are there any rebuildable heads available? If so at what cost? As ever, thanks for the replys, this knowledge base is awesome. Regards, Tom, TC2850 [Non-text portions of this message have been removed] Yahoo! Groups Links

[TMcNam4510@aol.com]

The adventure continues.....This is just a note to the group that I have not dynamited TC2850 in frustration. Hugh Pite has offered a usable head and I am taking him up on his offer. When I am ready to throw in the towel, this group keeps my feet on the ground. What a project and expense restoring this car is getting to be! It keeps me humble and.......appreciative of my bide of 40 years who thinks I am certifiably insane. regards, Tom TC2850, disassembled [Non-text portions of this message have been removed]

[Charles Hill]

Tom, Unfortunately Jeff is right. If the head is cracked so far that a new seat won't remove the crack, it is toast. Metal stitching works on blocks, but not inside the combustion chamber. As a machinist friend of mine used to say, you would be building a hand grenade. Regards, Charles Hill Jeff Redman wrote:

>G'day Tom, > >Hate to say it mate... but I think you now have a new door stop! >I've forgotten whether your cyl. head is round hole or banana water >passages. >Cracks in the latter are unusual but common in the former. Academic >here, really >Recently I floated a request for repair info on behalf of mate with >several >TF heads with a similar cracks, just in case new technology had emerged. >No luck >There are quite a few respected engine reconditioners down here, with >technical expertise as good as any on the international scene. >When contacted all were of the same opinion... if it's cracked through >the valve seat then its buggered. Fitting hardened seats in this >situation is Russian Roulette. >Metal stitching/ welding on blocks, as suggested elsewhere, is a vastly >different proposition to attempting repairs to the combustion chamber. >A fresh head is the only (safe) option. > >Good luck mate. > >Reddo > >-----Original Message----- >From: mg-tabc@yahoogroups.com [mailto:mg-tabc@yahoogroups.com] On Behalf >Of TMcNam4510@aol.com >Sent: Saturday, 21 May 2005 12:29 AM >To: mg-tabc@yahoogroups.com >Subject: [mg-tabc] Cracked Head > >The (mis)adventure continues...........The shop that is rebuilding the >engine has shown me that the exhaust valve seat in number 2 cylinder has >a >hairline crack in it. Even if they cut out enough material to >accomadate a hardend >seat, the crack will remain. My questions to the group are; does >anyone have >experience in sucessfully welding such a crack? Will the new hardened, > >pressed in seat stay put if the repair is atempted? Are there any >rebuildable >heads available? If so at what cost? > >As ever, thanks for the replys, this knowledge base is awesome. >Regards, >Tom, TC2850 > > >[Non-text portions of this message have been removed] > > > > >Yahoo! Groups Links > > > > > > > > > > >Yahoo! Groups Links > > > > > > > > >

[1939mgtb]

Actually, it can be repaired by oven welding. The head is heated carefully, then welded with special stick, then re-machined. Have done it twice at least with no problem down the road . Metal stitching is a different ball game, entirely. Best, Ray "Morology is our profession, our ONLY profession!"

----- Original Message ----- From: "Charles Hill" candahill@worldnet.att.net> To: mg-tabc@yahoogroups.com> Sent: Friday, May 20, 2005 9:09 PM Subject: Re: [mg-tabc] Cracked Head > Tom, > > Unfortunately Jeff is right. If the head is cracked so far that a new > seat won't remove the crack, it is toast. Metal stitching works on > blocks, but not inside the combustion chamber. As a machinist friend of > mine used to say, you would be building a hand grenade. > > Regards, > Charles Hill > > Jeff Redman wrote: > >>G'day Tom, >> >>Hate to say it mate... but I think you now have a new door stop! >>I've forgotten whether your cyl. head is round hole or banana water >>passages. >>Cracks in the latter are unusual but common in the former. Academic >>here, really >>Recently I floated a request for repair info on behalf of mate with >>several >>TF heads with a similar cracks, just in case new technology had emerged. >>No luck >>There are quite a few respected engine reconditioners down here, with >>technical expertise as good as any on the international scene. >>When contacted all were of the same opinion... if it's cracked through >>the valve seat then its buggered. Fitting hardened seats in this >>situation is Russian Roulette. >>Metal stitching/ welding on blocks, as suggested elsewhere, is a vastly >>different proposition to attempting repairs to the combustion chamber. >>A fresh head is the only (safe) option. >> >>Good luck mate. >> >>Reddo >> >>-----Original Message----- >>From: mg-tabc@yahoogroups.com [mailto:mg-tabc@yahoogroups.com] On Behalf >>Of TMcNam4510@aol.com >>Sent: Saturday, 21 May 2005 12:29 AM >>To: mg-tabc@yahoogroups.com >>Subject: [mg-tabc] Cracked Head >> >>The (mis)adventure continues...........The shop that is rebuilding the >>engine has shown me that the exhaust valve seat in number 2 cylinder has >>a >>hairline crack in it. Even if they cut out enough material to >>accomadate a hardend >>seat, the crack will remain. My questions to the group are; does >>anyone have >>experience in sucessfully welding such a crack? Will the new hardened, >> >>pressed in seat stay put if the repair is atempted? Are there any >>rebuildable >>heads available? If so at what cost? >> >>As ever, thanks for the replys, this knowledge base is awesome. >>Regards, >>Tom, TC2850 >> >> >>[Non-text portions of this message have been removed] >> >> >> >> >>Yahoo! Groups Links >> >> >> >> >> >> >> >> >> >> >>Yahoo! Groups Links >> >> >> >> >> >> >> >> >> > > > > > > Yahoo! Groups Links > > > > > >

[Ron Benson]

Hi all, Does anyone have any experience of welding cracks in cylinder heads? I have a spare one that has a crack in-between No.2 and 3 cylinder at right angles going towards the stud holes. It has also been skimmed beyond Stage2. Not sure if this has contributed to it or not. Regards, Ron Benson TB Very windy N. Yorkshire [Non-text portions of this message have been removed]

[MG Leckstein]

Ron, I had a TF head welded by a place in the Midwest that only does cylinder heads. They have some unique process, they were inexpensive and head came back like new. They test it and installed new valves and seats which were ordered from Moss and sent to them. If you are interested I will look up their name and address Mike on the summer like Jersey Shore. Almost 70 today. -----Original Message----- From: mg-tabc@yahoogroups.com [mailto:mg-tabc@yahoogroups.com] On Behalf Of Ron Benson Sent: Saturday, November 26, 2011 2:52 PM To: mg-tabc@yahoogroups.com Subject: [mg-tabc] Cracked head Hi all, Does anyone have any experience of welding cracks in cylinder heads? I have a spare one that has a crack in-between No.2 and 3 cylinder at right angles going towards the stud holes. It has also been skimmed beyond Stage2. Not sure if this has contributed to it or not. Regards, Ron Benson TB Very windy N. Yorkshire [Non-text portions of this message have been removed] ------------------------------------ Yahoo! Groups Links

[MG Leckstein]

Ron, found it. Take a look at Midwest Cylinder Head 1700 W F Avenue Nevada, IA 50201 (515) 382-2791 They did an excellent job Mike

[MG Leckstein]

Just realized Ron, that you are on the right side of the pond, so a place in Iowa USA isn't very helpful, Sorry, but it can be done. Mike -----Original Message----- From: mg-tabc@yahoogroups.com [mailto:mg-tabc@yahoogroups.com] On Behalf Of Ron Benson Sent: Saturday, November 26, 2011 2:52 PM To: mg-tabc@yahoogroups.com Subject: [mg-tabc] Cracked head Hi all, Does anyone have any experience of welding cracks in cylinder heads? I have a spare one that has a crack in-between No.2 and 3 cylinder at right angles going towards the stud holes. It has also been skimmed beyond Stage2. Not sure if this has contributed to it or not. Regards, Ron Benson TB Very windy N. Yorkshire [Non-text portions of this message have been removed] ------------------------------------ Yahoo! Groups Links