|
Model Engineering in UK - Model engineering, metal crafts in UK
|
|
|
|
|
Posted by Rob on February 24, 2008, 1:05 pm
Please log in for more thread options
Hello
I am about to replace the engine in my car, which requires me to shorten
the engines sump
I have chopped off the required amount and would like to know if anyone
knows of a good safe method of throughly cleaning the alloy prior to
it being TIG welded up
I know a few others that have cut and shut alloy sumps and when they
have had them TIG'd back up the cast has sweated out crud making the
repairs a bit sketchy and some have found they have minor leaks..(not ideal)
Some have had to use JB weld or similar epoxy's internally to try and
fix the leaks, but I would rather spend a little more time doing prep
work to give the TIG welder chap the best possible chance of making it
seal first time, and make his life as easy as possible
I did wonder about heating the cast alloy around the areas to be welded
to see if it would pre-sweat out the crud, but someone mentioned that
there /may/ be an obtainable acid dip suitable?
Thanks in advance
Regards
Rob
|
|
Posted by Martin Whybrow on February 24, 2008, 1:41 pm
Please log in for more thread options
> Hello
> I am about to replace the engine in my car, which requires me to shorten
> the engines sump
> I have chopped off the required amount and would like to know if anyone
> knows of a good safe method of throughly cleaning the alloy prior to it
> being TIG welded up
> I know a few others that have cut and shut alloy sumps and when they have
> had them TIG'd back up the cast has sweated out crud making the repairs a
> bit sketchy and some have found they have minor leaks..(not ideal)
>
> Some have had to use JB weld or similar epoxy's internally to try and fix
> the leaks, but I would rather spend a little more time doing prep work to
> give the TIG welder chap the best possible chance of making it seal first
> time, and make his life as easy as possible
>
> I did wonder about heating the cast alloy around the areas to be welded to
> see if it would pre-sweat out the crud, but someone mentioned that there
> /may/ be an obtainable acid dip suitable?
>
> Thanks in advance
>
> Regards
> Rob
Rob, try posting your question over on sci.engr.joining.welding.
Martin
--
martin<dot here>whybrow<at here>ntlworld<dot here>com
|
|
Posted by Peter Fairbrother on February 24, 2008, 2:09 pm
Please log in for more thread options Rob wrote:
> Hello
> I am about to replace the engine in my car, which requires me to shorten
> the engines sump
> I have chopped off the required amount and would like to know if anyone
> knows of a good safe method of throughly cleaning the alloy prior to it
> being TIG welded up
> I know a few others that have cut and shut alloy sumps and when they
> have had them TIG'd back up the cast has sweated out crud making the
> repairs a bit sketchy and some have found they have minor leaks..(not
> ideal)
>
> Some have had to use JB weld or similar epoxy's internally to try and
> fix the leaks, but I would rather spend a little more time doing prep
> work to give the TIG welder chap the best possible chance of making it
> seal first time, and make his life as easy as possible
>
> I did wonder about heating the cast alloy around the areas to be welded
> to see if it would pre-sweat out the crud, but someone mentioned that
> there /may/ be an obtainable acid dip suitable?
I don't know of one.
The problem is that acid isn't good for removing oily crud, and alkali,
which is, is also good at dissolving Aluminium and it's alloys.
Best think I can suggest is methylene chloride, which you may be able to
buy as a carbon remover in a very good hardware shop, or for use in a
vapour degreaser (use as liquid, not vapour). Nasty stuff though.
disclaimer - I have never tried to remove sump crud, with anything
-- Peter Fairbrother
|
|
Posted by John Stevenson on February 24, 2008, 2:17 pm
Please log in for more thread options
>Hello
>I am about to replace the engine in my car, which requires me to shorten
>the engines sump
>I have chopped off the required amount and would like to know if anyone
> knows of a good safe method of throughly cleaning the alloy prior to
>it being TIG welded up
>I know a few others that have cut and shut alloy sumps and when they
>have had them TIG'd back up the cast has sweated out crud making the
>repairs a bit sketchy and some have found they have minor leaks..(not ideal)
>
>Some have had to use JB weld or similar epoxy's internally to try and
>fix the leaks, but I would rather spend a little more time doing prep
>work to give the TIG welder chap the best possible chance of making it
>seal first time, and make his life as easy as possible
>
>I did wonder about heating the cast alloy around the areas to be welded
>to see if it would pre-sweat out the crud, but someone mentioned that
>there /may/ be an obtainable acid dip suitable?
>
>Thanks in advance
>
>Regards
>Rob
Do initial wash in clean paraffin.
Get an old pan big enough to take the sump.
Give the missus 10 quid and bus fare to go shopping, open all doors
and windows and stick on the stove and boil in a strong washing up
powder solution.
Before bead blasting was common and affordable we used to prepare all
the racing engines this way.
Won't hurt alloy, opens the pores and gets rid of the oil, even gets
rid of baked on oil unless it's really severe like R40 on a Manx head
but it does remove most of that.
|
|
Posted by Charles Ping on February 24, 2008, 3:47 pm
Please log in for more thread options On Sun, 24 Feb 2008 19:17:20 GMT, John Stevenson
>
>>Hello
>>I am about to replace the engine in my car, which requires me to shorten
>>the engines sump
>>I have chopped off the required amount and would like to know if anyone
>> knows of a good safe method of throughly cleaning the alloy prior to
>>it being TIG welded up
>>I know a few others that have cut and shut alloy sumps and when they
>>have had them TIG'd back up the cast has sweated out crud making the
>>repairs a bit sketchy and some have found they have minor leaks..(not ideal)
>>
>>Some have had to use JB weld or similar epoxy's internally to try and
>>fix the leaks, but I would rather spend a little more time doing prep
>>work to give the TIG welder chap the best possible chance of making it
>>seal first time, and make his life as easy as possible
>>
>>I did wonder about heating the cast alloy around the areas to be welded
>>to see if it would pre-sweat out the crud, but someone mentioned that
>>there /may/ be an obtainable acid dip suitable?
>>
>>Thanks in advance
>>
>>Regards
>>Rob
>
>
>Do initial wash in clean paraffin.
>Get an old pan big enough to take the sump.
>Give the missus 10 quid and bus fare to go shopping, open all doors
>and windows and stick on the stove and boil in a strong washing up
>powder solution.
>
>Before bead blasting was common and affordable we used to prepare all
>the racing engines this way.
>Won't hurt alloy, opens the pores and gets rid of the oil, even gets
>rid of baked on oil unless it's really severe like R40 on a Manx head
>but it does remove most of that.
And whilst she's still out put it in the dishwasher.
Then run the dishwasher empty just to be sure...
Charles
|
| Similar Threads | Posted | | Al alloy channel ? | April 13, 2008, 12:06 pm |
| Thumping cast-iron | July 31, 2008, 6:36 am |
| Cleaning Trefolex ??? | May 1, 2008, 5:03 am |
| Cleaning 3-jaw chuck | May 28, 2008, 8:25 pm |
| Re: Advice please-tapping in cast aluminium | February 13, 2007, 4:13 am |
| Meddings drill repair | January 20, 2008, 10:28 am |
| Repair of a broken camera lens | July 20, 2008, 7:14 am |
| Drummond Round Bed (rebuild/repair/remove to skip) | August 10, 2006, 10:49 am |
|
|
|
Yahoo! 
Google 
Windows Live 
del.icio.us 
digg 
Netscape 
XML Sitemap
> I am about to replace the engine in my car, which requires me to shorten
> the engines sump
> I have chopped off the required amount and would like to know if anyone
> knows of a good safe method of throughly cleaning the alloy prior to it
> being TIG welded up
> I know a few others that have cut and shut alloy sumps and when they have
> had them TIG'd back up the cast has sweated out crud making the repairs a
> bit sketchy and some have found they have minor leaks..(not ideal)
>
> Some have had to use JB weld or similar epoxy's internally to try and fix
> the leaks, but I would rather spend a little more time doing prep work to
> give the TIG welder chap the best possible chance of making it seal first
> time, and make his life as easy as possible
>
> I did wonder about heating the cast alloy around the areas to be welded to
> see if it would pre-sweat out the crud, but someone mentioned that there
> /may/ be an obtainable acid dip suitable?
>
> Thanks in advance
>
> Regards
> Rob