Go Back   The Supercar Registry > General Discussion > Technical & Restoration


Reply
 
Thread Tools Display Modes
  #21  
Old 04-11-2021, 01:53 PM
rszmjt rszmjt is offline
Senior Member
 
Join Date: Nov 2004
Location: Calgary,Alberta,Canada
Posts: 263
Thanks: 5
Thanked 117 Times in 77 Posts
Default

Quote:
Originally Posted by mhm1966 View Post
Kevin,

I am glad you are using welding material for the USA. The stuff made in China is junk and will never provide an adequate weld. You should also make a jig to mount your exhaust manifold in so that when your done welding the holes in your exhaust manifold lineup with the threaded holes in your head.

Chances are you will have to drill the bolt holes out a little bigger on the end cylinders #1 & #7 anyway, those style manifolds always seem to shrink in from heat.

We used to see that sort of cracking on similar design exhaust manifolds from mid 70,s Chev trucks that had propane conversions.
Reply With Quote
  #22  
Old 04-11-2021, 09:11 PM
KevinW KevinW is offline
Yenko Contributing Member
 
Join Date: Sep 2003
Location: Millstone, NJ
Posts: 970
Thanks: 2
Thanked 102 Times in 67 Posts
Default

Quote:
Originally Posted by mhm1966 View Post
Kevin,

I am glad you are using welding material for the USA. The stuff made in China is junk and will never provide an adequate weld. You should also make a jig to mount your exhaust manifold in so that when your done welding the holes in your exhaust manifold lineup with the threaded holes in your head.
Hmm, that might be tough. I have to cool this down slowly, so overnight in a bucket of sand is the ticket.

I have been working on the smog tubes and the un-cracked manifold. Once done with that I plan to switch to the nickel MIG wire and try it out.
__________________
69 SS 350 convertible (in peices)
69 327 convertible (driver)
Reply With Quote
  #23  
Old 04-11-2021, 09:13 PM
KevinW KevinW is offline
Yenko Contributing Member
 
Join Date: Sep 2003
Location: Millstone, NJ
Posts: 970
Thanks: 2
Thanked 102 Times in 67 Posts
Default

Quote:
Originally Posted by rszmjt View Post
Chances are you will have to drill the bolt holes out a little bigger on the end cylinders #1 & #7 anyway, those style manifolds always seem to shrink in from heat.

We used to see that sort of cracking on similar design exhaust manifolds from mid 70,s Chev trucks that had propane conversions.

Thanks for the tip. I will test fit the manifolds and see how they fit before welding. I can always hit the bolt hole with a die grinder.
__________________
69 SS 350 convertible (in peices)
69 327 convertible (driver)
Reply With Quote
  #24  
Old 04-12-2021, 01:07 AM
rszmjt rszmjt is offline
Senior Member
 
Join Date: Nov 2004
Location: Calgary,Alberta,Canada
Posts: 263
Thanks: 5
Thanked 117 Times in 77 Posts
Default

Quote:
Originally Posted by KevinW View Post
Thanks for the tip. I will test fit the manifolds and see how they fit before welding. I can always hit the bolt hole with a die grinder.
Very hard to die grind that length of hole, just use numbered bits and drill it slightly larger till bolts go in if the manifold has shrunk.
Reply With Quote
  #25  
Old 04-12-2021, 08:03 AM
bergy's Avatar
bergy bergy is offline
Yenko Contributing Member
 
Join Date: Feb 2005
Location: Pennsylvania, Florida
Posts: 2,674
Thanks: 611
Thanked 1,113 Times in 327 Posts
Default

Most of you probably know this, but there was a repair station at the Tonawanda Foundry for cosmetic welds on cast iron parts. These repairs could only be done on non-stress areas though. The repairman just heated the damaged area to cherry red with a torch - then welded the damaged area - then covered the repair with asbestos cloth. They left the asbestos on until the next day before grinding the repaired area smooth. Most of the repairs involved chipped valve cover rails on heads and intake mating surfaces on the front and back of blocks.
Reply With Quote
  #26  
Old 08-12-2021, 07:46 PM
KevinW KevinW is offline
Yenko Contributing Member
 
Join Date: Sep 2003
Location: Millstone, NJ
Posts: 970
Thanks: 2
Thanked 102 Times in 67 Posts
Default

OK, sorry for the delay. Family stuff came 1st in priority

So I wanted to fill a hole in a riser for a blank. Here are the pics. Had some feed issues partway through, so some crappy welds. But good news, a cutoff wheel took the welds down with no issues.

Did a dollop of weld right on the cast surface (previously media blasted). Could not pry it off. Then did some grinding and smoothed out nice without any cracking that I could see. Did some chip hammering and it dented easy.

Then I filled the hole, no pre-heating of cooling. That amount of weld did not heat the part that much. Ground it smooth, easy-peesy

Next, will have to make a crack in a junk manifold, drill it and bevel and see how it goes.
Attached Images
       
__________________
69 SS 350 convertible (in peices)
69 327 convertible (driver)
Reply With Quote
  #27  
Old 08-13-2021, 06:09 PM
KevinW KevinW is offline
Yenko Contributing Member
 
Join Date: Sep 2003
Location: Millstone, NJ
Posts: 970
Thanks: 2
Thanked 102 Times in 67 Posts
Default

Alright! Lets work on an actual crack! On a test manifold

Drilled some holes at the end of the crack, but later saw it go further, so grinded past.

Cut a groove and ran a bead. Then put it in some media to slow cool it.

My feed issue is fixed, but I was not centered in the groove and it missed one edge. But still weld stuck well in the groove IMO.

Will still need grinding and some more passes, but I am happy with the result. Pinged it with hammer and it rang well.

I think I will next fix the smog manifold over the weekend and finish this test one up after.
Attached Images
     
__________________
69 SS 350 convertible (in peices)
69 327 convertible (driver)

Last edited by KevinW; 08-13-2021 at 06:17 PM.
Reply With Quote
The Following User Says Thank You to KevinW For This Useful Post:
SuperNovaSS (08-14-2021)
  #28  
Old 08-14-2021, 10:06 PM
KevinW KevinW is offline
Yenko Contributing Member
 
Join Date: Sep 2003
Location: Millstone, NJ
Posts: 970
Thanks: 2
Thanked 102 Times in 67 Posts
Default

Well, that was a FAIL! Weld looked nice but did not adhere. Ground it flat, hit the edge of the manifold and the cracks appeared. Well this is why we test

Did the first pass over an inch, too much probably. Next test will be 350 deg preheated, only 1/2 inch passes, then stress relieve, then back in the heat. Also instead of 75% Argon, I will be going full Argon and bumping up the heat range of the welder.
Attached Images
 
__________________
69 SS 350 convertible (in peices)
69 327 convertible (driver)
Reply With Quote
  #29  
Old 08-15-2021, 09:53 PM
frankk frankk is offline
Senior Member
 
Join Date: Jan 2005
Location: Prince George.B.C.
Posts: 588
Thanks: 0
Thanked 36 Times in 31 Posts
Default

What are you doing to stress relieve?
Reply With Quote
  #30  
Old 08-17-2021, 02:18 PM
KevinW KevinW is offline
Yenko Contributing Member
 
Join Date: Sep 2003
Location: Millstone, NJ
Posts: 970
Thanks: 2
Thanked 102 Times in 67 Posts
Default

No stress relief, just welded and stuck in media to cool. It was a test next test will include relief with pick hammer.
__________________
69 SS 350 convertible (in peices)
69 327 convertible (driver)
Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT. The time now is 11:16 AM.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.

O Garage vBulletin Plugins by Drive Thru Online, Inc.