London TIG Welding - Crankcase

[ivorybull]

Hi

I have recently cracked the crank case on my 1978 Yamaha TY175 On the bike forum they recomend getting it TIG welded.
Can anyone recomend a place to take it in the London area. I'm based in Herne Hill SE24.

Its a clean break and I recon will need a 6" weld to fix it.

Thanks

Iain

 

[the snooper]

welcome to the forum iain

there must be someone on here that can recomend somewhere to take your cracked crank case

 

[Shox Dr]

Bring it to Yorkshire I'll do it

 

[michael1703]

I used a place called Alpha welding in croydon

2 Bensham Lane
Croydon
Surrey
CR0 2RQ

Tel: 0843 262 0455

 

[Tigman]

im not too far from London I`ll do it !

 

[Freshfabrications]

Hi Im a tig welder based up the road from you in west norwood I can take a look at it for you to asses the job if it's not done already!

Jon

 

[Welderpaul]

Jon,

Wise not to post your mobile number on the internet, if a member of the forum wants to contact you, then can do so by private message.

 

[scott0031]

I did offer to do it for the guy when he posted, he has not logged on since he posted this thread.



Kind regards,

Scott

 

[Freshfabrications]

Thanks welderpaul,

my mistake, will pm next time.

Scott sorry not trying to step on your toes, just posted as my workshop is 10 min from where he is.

Thanks

 

[ivorybull]

Thanks for all your replies and sorry to Scott for not getting back to you, I've been in Ireland and up North for the past two weeks visiting family.

I managed to get a replacement second hand case which should fit but there is a small crack on the main case where it bolts on so will still need a small amount of welding. I will post some pictures when I get a chance.

Getting married in a few months so the wife to be has me busy on other less interesting jobs

Thanks Iain

 

[scott0031]

Scott sorry not trying to step on your toes, just posted as my workshop is 10 min from where he is.

Dont worry, I'm not offended in the slightest, I was more making the point that Ian hadn't logged back in since, rather than making a point i had offered. If i was Ian I would use you being local if the price is right and the job is right.


My kind regards,


Scott (ward engineering)

 

[ivorybull]

Attached are images of the crack on the main crankcase fixing point.
It has cracked in three places all about 1/2 inch long.
Is this weldable?

Images of the crankcase cover to follow (the DT125 crankcase cover I bought does not fit contrary to advice given on the trial bike forum!)

 

[ivorybull]

Attached are pictures of the cracked crankcase cover.
The case has signs of previous repairs, the whole corner around the kickstart has snapped off and there are cracks and a small whole.

Looks like scrap to me??

 

[scott0031]

The first one is repairable with no real issues, it would need the hole re drilled and tapped, but that's no problem.


The clutch casing is repairable but not very straight foward, you have a large area of the gasket face which is broken off, this will mean some work getting that face back to original and possibly re skimming the whole gasket face after welding. It really depends how well the broken off section will fit back in and with what accuracy.

The other problem is that the broken off piece has the kick start shaft hole in it. Again there could well be alignment problems pending how well the broken part of the casting fits back in. The worst case is you will most likely have an oil leak, how bad that leak will be is hard to say pending how well the pieces line up. If the alignment is bad It can still be resolved by plugging/ welding or just welding up the hole and re machine, taking the position off the crank case half. It's really a case of someone having to have a close look at it in person. It is resolvable but could be a bit problematic and that repair wont be cheap and more expensive if it goes to worst case scenario.

I have not covered all methods as there are other techniques to get the broken part back in the right place, but i hope it will give you an insight.

Keep in mind that ideally you need someone who can weld and carry out machining competently if it deems necessary.



My kinds regards.


Scott (ward engineering)

 

[Pete.]

Surely the best way to fixture that would be to bolt it up to the bare engine cases for welding?

 

[Freshfabrications]

Hi all,

Looks like the thread boss should be pretty simple, just a good clean up, melt out the crud with the arc and weld up. It will need some work with a die grinder and drilling and tapping to get it back to normal.

The big cluch casing repair is pretty serious and has a good chance of being a fail, I do have a milling machine but have never skimmed for gasket interfaces and possibly lack fixturing to mount it up nice, if you would be willing to bring it to my place so I can take a look first hand that would be a good first step as photos can mask the true depth of the repair needed.

I also have an excelent vendor for media blasting and polishing if we do get the job done satisfactoraly.

Please PM me with your phone if your interested and I'll give you a call.

 

[scott0031]

Surely the best way to fixture that would be to bolt it up to the bare engine cases for welding?

Yep Pete you are correct it is a method. I have do done several casings in that state and worse requiring some serious work and re machining. Sometimes the broken part if its broken by impact can be too damaged to use that method. Cant really say for sure without inspection. I couldn't cover all methods of doing it as i was in a rush to get out the house.


Kind regards,


Scott

 

[Highpower]

Attached are images of the crack on the main crankcase fixing point.
It has cracked in three places all about 1/2 inch long.
Is this weldable?

Iain, I think that could be easily repaired since I just had an identical problem with a small chainsaw engine. Please forgive the appearance of my repairs since I have just started to teach myself how to TIG weld, and I am very inexperienced at it. However I think it may show how effective a repair can be by someone else that really knows what they are doing.

Best of luck in your quest!