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Discussion Starter #1
Hi all,

Does anyone know what type of aluminum alloy was used to cast these heads? And if it is possible to weld this material?

I have a cylinder head that has had the water pump impeller come loose from its shaft. It looks like it was still being driven and unfortunately has worn down the casting. This was discovered after finding water in the engine oil. I did a pressure test and could hear a leak near the top of cylinder 1. The head was removed and pressure tested again, where a very small hole was found, small but large enough to cause trouble.

The photos show where I have drilled a hole hoping I could plug it with a threaded insert, but thanks to the wearing the material is now approx 1.5mm thick. My luck for beliving the previous owner when he said the pump was changed with the timing belt... date code on the impeller says 98' so it turns out.

I think my only solution now is to find a talented tig welder to build up the surface from the impeller side to block the hold and restore the original wall thickness, what I am not sure is if this can be done successfully. I am sure there are welders that could do the job, but I know that welding cast alloy material has many challenges.

Any insight on this problem is greatly appreciated.


937920

937921


P.S.

I hope others can learn from my mistake here, and change that pump regardless on how good the bearing feels or what you have been told. It appears that its replacement is recommended because of the life span of the impeller and not on the seal and bearing. I did try to find an alternative part that uses metal for the impeller instead but was not successful.

Thanks again.
 

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2010 Alfa Romeo Mito 1.4, 2003 Alfa Romeo GTV Phase 3 JTS
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Is it possible to put a steel sleeve in and maybe epoxy in place?
 

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Discussion Starter #4
Thanks for the feedback. I had considered an adhesive solution, but I don't think there are any products that can handle being exposed to the glycol coolant, and large temperature changes from cold to running. But that's a very interesting video, have you had success with that product on the water channels before? If so I wonder if it is available in Australia? Cheers.
 

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2010 Alfa Romeo Mito 1.4, 2003 Alfa Romeo GTV Phase 3 JTS
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74 Posts
Thanks for the feedback. I had considered an adhesive solution, but I don't think there are any products that can handle being exposed to the glycol coolant, and large temperature changes from cold to running. But that's a very interesting video, have you had success with that product on the water channels before? If so I wonder if it is available in Australia? Cheers.
I'd encourage you to look at metal loaded epoxy such as JB weld (the grey colour stuff) as I have used it on an expansion tank that had a large split, and also to repair the engine block of a lawn tractor. It is marvellous stuff
 
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