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MG Midget and Sprite Technical - Head repair

Just tried reactivating this topic but it doesn't want to work for me (I clearly don't have a good working relationship with the BBS Archive system!)

I wanted to show the alloy head repaired.
It was welded and then a 2 "thou" skim taken off just to freshen it up.- 5 thou is the max permissible on these heads. Not sure what weld alloy was used but one can only just make out the weld area and that is with knowing exactly where it is! But it does show what can be done.

Guy

Guy

And as a reminder, this is the before version

Guy

Wow.... That turned out nice

Totally differant photos

Prop
Prop

That looks nicely viable Guy

Will you be able to gently work the bad bit of combustion chamber clear, with your rusty Dremel?

I think I would like to help that chamber forget it ever had issues myself, rubbing the surface smooth might help if it could be done without taking away any serious amount of metal.

Perhaps

I wonder what the real engineers round here think though?

It has defimitely got a healthier outlook at last :)

(My Dremel is getting RUSTY 'cos I've hardly used it since I bought it )
Bill 1

Hi Bill,
Do you mean the bit that looks like slight pitting on the chamber between the valves at the top of the photo? If that is what you are referring to it is catching the light and looks worse than it actually is. It is very slight and would rub out with some emery paper.

The next task is to remember where all the bits go!
And then work out how to time 4 independent cam shafts! I can feel brain pain coming on already!

Guy

Yeah ... But you know there is going to be one hidden part you will find at the end...hahaha

Prop
Prop

Btw.... Was this the masaratii engine

Prop
Prop

wow, looks like you've got your work cut out for you.
seems I've been absent and missed out on this new project, what are you up to?

Alex
Alexander Sorby Wigstrom

Looks spanking.

Can you divulge how much the head repair cost?
Lawrence Slater

Guy
"Do you mean the bit that looks like slight pitting on the chamber between the valves at the top of the photo?"

Actually I think I am looking at a Red Herring

I "meant" the dark area, botom of the chamber right hand side

but that isnt the one you showed us in the other photo

so sorry mate

forget I writ wot I WRIT

The repaired part is very good
Bill 1

Bill,
That patch is just decolouration l think, but l will check when l go to the workshop.
There are repaired areas on the "south" side of both those chambers. One is pretty well invisible, the other shows as a shadow that looks like a thumb print by the right hand chamber.

Haven't had the invoice yet but they did some crack testing at the same time.
Guy

Looks pretty good guy. However the proff of the pudding... I'm sure it will be fine.

I can't tell where the repair is, I'm a bit confused as it was cylinder 2 that was damaged and this shows cylinder one...

You can see on the freshly skimmed head quite a few little pock marks. I would guess that these areas of porosity in the casting, the possible source of the original loss of material?

Malcolm
Malcolm Le Chevalier

Looks ok from here - congrats on finding someone that knew what to do-------- cheers Willy
William Revit

Looking at the minor pitting on the surface I think it will be fine for you when you have put that mekkanikkal jigsaw puzzle together

If as seemed to be the concensus the corrosion and decay were brought about by incorrect coolant mixture it is likely that using the recommended mix will make it last as long as you want it to

The jigsaw looks like fun

nice one mate

Bill 1

Actually Malcolm the damage was on #6, which had corrosion extending past the cylinder liner, and #8 where it hadn't quite broken through. If you look at the before shot you can see the #8 damage at the far right.
The after photos ate of the same 2 cylinders, but taken with a different camera angle.
Guy

This thread was discussed between 17/10/2011 and 18/10/2011

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