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 We have liftoff.....AZU 250 rebuild thread 
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Firing on two.
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Joined: July 10th, 2010, 12:35 pm
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Location: Magyar
Post Re: We have liftoff.....AZU 250 rebuild thread
Maybe the chemical metal will do the trick and you have many km ahead before you will have to tackle the problem.

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August 18th, 2020, 7:10 am
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Firing on two.

Joined: February 17th, 2009, 8:43 pm
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Location: NOrWAY
Post Re: We have liftoff.....AZU 250 rebuild thread
I used chemical metal on pushrod tubes in 2011, and it's still working. Applied it all around the tube, but I think it will be fine just as a spot patch since you're head is mounted to the engine. But the bigger area it is applied to, the better. Make sure the rod is totally clean, and rub it down with fine abrasive, before applying the chemical metal. The engine has not been used much until this summer, but all seems fine. No leaks. I consider it a permanent fix.

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August 18th, 2020, 10:01 am
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Joined: January 1st, 2009, 7:37 pm
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Post Re: We have liftoff.....AZU 250 rebuild thread
A pushrod tube suffered a major leak (the hole was/is absolutely tiny but obviously very high pressure) and I used exhaust paste/putty as "stop gap." It's still oil tight three years later. I did buy a tube of chemical metal to do a "better job" but as the exhaust paste is providing an oil-tight seal I'm in no rush to disturb it.

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August 18th, 2020, 1:55 pm
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Joined: May 23rd, 2011, 7:14 pm
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Location: ecosse
Post Re: We have liftoff.....AZU 250 rebuild thread
Thanks folks !

Materials ordered for repair....I found a post by Ken H, from 2011...

ken wrote:
Or some thin sheet aluminium, shaped to wrap halfway around the tube, with Araldite and a couple of jubilee clips to hold everything together. ;)

That's still in place on an engine I put together about 15 years ago..

ken


15 years will outlast me :D :D

I'll take some pics when its done.


August 18th, 2020, 5:17 pm
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Joined: October 22nd, 2014, 10:59 pm
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Location: South-Limburg
Post Re: We have liftoff.....AZU 250 rebuild thread
Did the cooling shrouds touch it?


August 18th, 2020, 8:26 pm
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Joined: May 23rd, 2011, 7:14 pm
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Location: ecosse
Post Re: We have liftoff.....AZU 250 rebuild thread
the hole is nearer the bottom of the tube so a couple of mm clearance for plate and clip,,,,,I've been out tonight and cut and shaped the patch. hopefully the Araldite here tomorrow.

Also, found a perished fuel pipe at bottom of pump, so ordered some ethanol resistant pipe to replace it while its accessible....


August 19th, 2020, 12:31 am
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Joined: May 23rd, 2011, 7:14 pm
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Post Re: We have liftoff.....AZU 250 rebuild thread
The hole

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Cleaned up
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The patch
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The gunk
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Patched and clamped
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August 20th, 2020, 12:03 am
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Joined: July 10th, 2010, 12:35 pm
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Post Re: We have liftoff.....AZU 250 rebuild thread
Fingers crossed :)

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Ez a türelem kérdése.........


August 20th, 2020, 7:06 am
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Joined: May 23rd, 2011, 7:14 pm
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Location: ecosse
Post Re: We have liftoff.....AZU 250 rebuild thread
Well, seems to be oil tight :) Ran engine till hot and all seems well

Put it all back together, and put the seat in..... out blinking into the sunlight under her own steam for the first time in 12 months ....

Tracking and try to get exhaust sealed tomorrow

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August 21st, 2020, 9:16 pm
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Joined: March 21st, 2013, 12:04 am
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Post Re: We have liftoff.....AZU 250 rebuild thread
Woo woo ... thats progress :D

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August 21st, 2020, 11:53 pm
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