Author Topic: A65 extreme spark plug thread repair  (Read 298 times)

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Steve Tipper

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A65 extreme spark plug thread repair
« on: 30 November, 2017, 14:09:20 »
I've just got hold of the correct OIF type head for my A65 project.
One of the plug threads has been butchered by a drunken gorilla.
A standard helicoil just isn't going to be possible.
By the look of things either the hole is going to have to be completely welded up and re-machined or some sort of substantial insert fitted.
Any recommendations please ?


Steve Tipper

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Re: A65 extreme spark plug thread repair
« Reply #1 on: 30 November, 2017, 14:30:36 »
Photos

Bess

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Re: A65 extreme spark plug thread repair
« Reply #2 on: 30 November, 2017, 14:42:37 »
Hi,
    By the look of the images, I would source another or send to SRM in Wales, they give an estimate and recommendations before starting.

Best wishes...

A10 JWO

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Re: A65 extreme spark plug thread repair
« Reply #3 on: 30 November, 2017, 16:24:25 »
I had similar issues with a Ducati head years ago. I took it to a vintage car restorer, the head was heated to the correct temperature, welded and a new thread cut. Get a copy of Old Bike Mart, there are loads of engineering adverts in there. Otherwise have a run around your local trading estates and find an establish old school workshop, there are loads out there; you will be surprised and the old lads enjoy these challenges. They generally don't take liberties.

om15

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Re: A65 extreme spark plug thread repair
« Reply #4 on: 30 November, 2017, 16:43:56 »
I had similar and had it repaired here

 http://www.g-c-s-motorcycles.co.uk/

Good job, good price and had a tour of the workshop, nice bloke owns it,

BARNFIELD

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Re: A65 extreme spark plug thread repair
« Reply #5 on: 02 December, 2017, 18:32:24 »
Hi, have just had some work done on a S/Rocket head, one of the repairs was on a thread insert fitted incorrectly. Whilst there, the cyl. head guy (40 years experience) showed me the 3 types of insert, call them stage1,2 and 3. Stage 1 is a helicoil for cross/stripped plug threads. Stage 2 is a copper coated medium steel insert for use where there is insufficient metal to accept a helicoil. Stage 3 is a heavy duty copper coated steel insert for totally butchered holes. These have to be fitted by an skilled engineer. mine wasn't and came out attached to the plug whilst removing it for inspection. This was remedied by using a special loctite. They told me if the insert ever needed to be removed, it would have to be machined out, it's that good. Don't know your location, but the firm i used was South Cerney Engineering Ltd, Ashton Keynes near Cirencester. Worth checking out their website.

Steve Tipper

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Re: A65 extreme spark plug thread repair
« Reply #6 on: 02 December, 2017, 19:13:12 »
Thanks for all the advice.
It looks like a stage 3 job to me.
I think that I know of an engineers in the Midlands who may be able to help me out with this.
If they can't they will be able to point me in the direction of somewhere that can.
I think I'll have to get a small amount of weld added around the outside face before machining starts.