Gentlefolks,
Your help please. A friend is rebuilding a Javelin engine and on one of the water transfer holes (on the front of the block), there is what might be corrosion or may be where somebody rammed something into the block. However it needs something to give it a better surface so it won't leak. What epoxies or fillers have members used that they are impressed with please? The plan will be to sand it down to shape and size after it has hardened.
Corroded block
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Alastair Gregg
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Corroded block
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Compliments of the Season,
Alastair Gregg
Alastair Gregg
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Jack
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Re: Corroded block
Hi Alastair,
I'd get it welded before looking at other materials as an option.
Any decent aluminium welder should be able to build it up neatly, with some careful grinding you will get the face right, and a dremmel will get the interior seal hole tidied up.
Gut feel is that anything stuck on will eventually crack with the increase and decrease in temp and exposure to coolant, and a repair including the cleanup should be less than 50 quid cash.
Jack.
I'd get it welded before looking at other materials as an option.
Any decent aluminium welder should be able to build it up neatly, with some careful grinding you will get the face right, and a dremmel will get the interior seal hole tidied up.
Gut feel is that anything stuck on will eventually crack with the increase and decrease in temp and exposure to coolant, and a repair including the cleanup should be less than 50 quid cash.
Jack.
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Keith Clements
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Re: Corroded block
Looks like it has sat in water on that corner for a while and has corroded. This will need to be thoroughly cleaned prior to welding. This area is not highly stressed and does not have oil ways close by so welding is an option. The aly in the block is high silicone alloy so 5% Si rod is needed. Finishing afterwards with a file is probably all that is necessary, rather than trying to set up in a milling machine. Really depends what the rest of the head face is like.
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David Morris
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Re: Corroded block
Hi,
Be very very careful! Before having it welded, ask if the weld process involves pre-heating the block. We have seen more blocks ruined by welding than cured. Yes, it is near the edge of the block so that's hopeful. It might be an idea to fit the head on that side before welding, to hold everything in place and provide a heat dump.
Probably before you start, it would be a good idea to air pressure test the block to see if there are any other cracks, before you spend your money. ( only around 15% of our blocks actually pass! ) Also, repeat the air pressure test after welding to see if the block is still ok?
Best of luck!
David
Be very very careful! Before having it welded, ask if the weld process involves pre-heating the block. We have seen more blocks ruined by welding than cured. Yes, it is near the edge of the block so that's hopeful. It might be an idea to fit the head on that side before welding, to hold everything in place and provide a heat dump.
Probably before you start, it would be a good idea to air pressure test the block to see if there are any other cracks, before you spend your money. ( only around 15% of our blocks actually pass! ) Also, repeat the air pressure test after welding to see if the block is still ok?
Best of luck!
David