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Some years ago my TR6 head went away to a well known shop, I asked for new guides and seats. When it returned I found the chap had taken it upon himself to fit bigger valves and open the ports. I’ve had no end of trouble since with the timing side constantly blowing head gaskets, the last time wrecking a con rod. Today whilst removing the exhaust valve guide I found out why. He opened up the exhaust port so far he broke through and I have hole between the fins on top of the head! Why can’t people just do what they are asked?

Rod

Last edited by R Moulding; 08/22/20 8:06 pm.

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Any chance he got your head Mixed up with someone else’s?


Now let’s all have a beer beerchug

68’ A65 Lightning “clubman”
71’ A65 823 Thunderbolt (now rebuilt)
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Unfortunately not Mate. I found out when I rang to chase the job, he had already done most of the work.
Rod


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I'm so sorry Rod thats so frustrating. I send my hed off an my suzuki for some head work and the guys made a huge ding in the surface where the cam runs (straight on the aluminum head)... I feel for you. Make him buy you a new one! (easier said than done)

Last edited by BrettF; 03/31/20 7:30 am.

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What an idiot. If not too far away, I'd have paid him a visit in person. That's a powerful method, and no need for shouting or threats either. Your mere presence is plenty enough to underline your determination.
The job you paid for is one thing, you paid for something you didn't get. The other is the need for a new head. If I had done something like that to a customer's bike, I'd have taken the cost and made it right.

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I had a similar experience when I sent off a Trident head. I just wanted the valves put in and lapped to the seats. When I got it back there was some mention of 'shaving' the head, but I thought nothing of it.
That is until it continued to need re-torquing of the head nuts. Turns out the valves were barely kissing the tops of the pistons!
Yes, there is an abundance of morons in the world.


It's not a bug, it's 'character.'

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Yes, he also skimmed the head.
Now I’ve got my head around it I’m more pissed off I didn’t notice it before. I’m also starting to question how much of an issue it could have been. The hole is inside the port next to the valve guide, what would be the chance of it sucking in air on the overlap?

I still think it’s piss poor workmanship and has just added to the issues caused by a 550 pound head job!

Rod


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My trusted machinist hired a guy, who handed me back the head on a T140 I was going through, and said “wow, I had to take .040 off just to get it flat! “—without ever asking me. I had asked him to check the condition of the valves, and now I had a head with big pushrod tube sealing problems. Of course I said “you did what?” And explained the problem with the pushrod tubes and the fix being to bend the head back level. I think I finally got the resulting pushrod leaks solved with shortened aluminum tubes from MAP, but what a pain!!

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and lapping in new valves resulted in severely recessed seats to that I had to get metal taken off the combustion chamber to get rid of the corners and now have to shim the springs to maintain any resemblance of valve spring tension......and not bothering to line ream the new timing side bushing but instead grinding the crank to match the raw bushing which took me part way to the next regrind and then discovering that the crank journal was ground on a taper that I had to have corrected and this was after giving them specific written instructions of how it was supposed to be done....Now I only get anything done somewhere else and only if there is no other option. There's always something

Cheers, Wilf


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...and you guys, mostly in USA, with all those specialized shops for old British bikes...

reverb #803677 04/01/20 5:52 pm
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Originally Posted by reverb
...and you guys, mostly in USA, with all those specialized shops for old British bikes...


I fail to see the relevance in this comment?


Now let’s all have a beer beerchug

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...that here there is no any so we need to deal with what we have (car shops that do not have the knowledge to work with old British bikes and worn out parts)

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I'm late to this thread, but around 1983 I sent the bottom end of my Not a Triumph Spitfire MkII to Devimead for a bottom end conversion. Somewhere along the way I agreed to a new "worked" head which was offered. It had a sight break on a fin which the guy I spoke to( apprentice, I reckon) offered to fix so no-one would know. When it arrived back in Aus ,his "fix" was to break the fin on the other side to match.
Just thought I'd throw that in

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Almost be worth the plane fare to punch the c*&t in the head.

Rod


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After all these years I'm proud to say that I'm perfectly capable of screwing up my own engine, thank you. laughing


It's not a bug, it's 'character.'

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Got round to cleaning up my cylinder head, hole courtesy of The Cylinder Head shop.......
[Linked Image from i.imgur.com]
[Linked Image from i.imgur.com]

Rod


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That’s shocking. Demand they buy a replacement head.


Now let’s all have a beer beerchug

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67’ D10 sportsman (undergoing restoration)
68’ D14 trials (undergoing transformation)

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Hello RMoulding; may you takes measurements from top to the base gasket? Through the holes.

Thanks

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Reverb, I can but since he also skimmed the head I do not know how much help it will be.

Rod


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That's not too bad,i'd be tempted to drill it and put a small nut and bolt in there, it''l
seal up with a bit of carbon quickly.
With all this stuff, most blokes have disaster stories to tell about work done etc.
I've seen some diabolical 'fixes' done over the years and in lots of cases the 'fixed'
article was worse than the broken original. Welding is the biggest issue.
The CHS in Wimbledon did a very good job on an a65 racing head for me years ago,
but i went in there and went through what i wanted done, i would never just post
and hope for the best with my stuff. I don't really trust anyone that well, when i was
naive enough to do it i was always disappointed. If the chap had done that to my
cylinder head he would have had some trouble walking for the next month or two,
unless of course he had offered to pt it right.

reverb #808005 05/05/20 11:17 pm
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Originally Posted by reverb
Hello RMoulding; may you takes measurements from top to the base gasket? Through the holes.

Thanks
On a T140?


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Hi Reverb, This link may help with your head thickness? It's about PRT & heads. Down towards the end is the head thickness info.

http://vintagebikemagazine.com/technical-articles/push-rod-tubes/

Don


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Yes; T140; do you say that the TR6 have different distance? Having different heads measured (through the holes) I/we can obtain references to what really works or do not. (in bikes that actually work)

-Hi TR7RVMan; I read that thread few years ago but I would read again.

Thanks

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I wonder if the original ham-fisted machinist butcher broke through or machined the port too thin. The hole looks irregular (figure 8 shaped) and has what appears to be wall thickness. If he machined too thin, but didn't break through, the actual opening might have appeared later after a few hot-cold cycles. I'll bet that hold blew hot exhaust gas like crazy. Not taking the butcher's side, but he may not have known he did it. Nevertheless, a very bad job.

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The worst part of this is they advertise themselves as "experts" in this field.

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