Catalytic Converter Welded
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Junior User
Joined: Mar 2012
Posts: 91
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From: Greenville, SC
Catalytic Converter Welded
i have a 1975 F250 Highboy and i think the previous owner had after market exhaust pipes installed. But there is a terrible rattle coming from the catalytic converter its not the mounts i have shaken and knocked. But the pipes and the catalytic converter seem to be one piece. there are no bolts just welds. Is this how it should be. Or did the previous owner just put me it a S**t hole
Lead Driver
Joined: May 2007
Posts: 6,993
Likes: 15
From: Costa Mesa, CA
sounds like the innards of the cat are breaking down or broken down already and rattling within the case.
Have an exhaust shop cut the cat out & look and do it soon.
I've had cats break down before & have had pieces of them come free & lodge themselves in the exit pipe of the cat. No exhaust being able to pass through the system = no good.
I've had it happen while driving on the freeway & it was a big surprising. Lost power all of a sudden on a hill!
Have an exhaust shop cut the cat out & look and do it soon.
I've had cats break down before & have had pieces of them come free & lodge themselves in the exit pipe of the cat. No exhaust being able to pass through the system = no good.
I've had it happen while driving on the freeway & it was a big surprising. Lost power all of a sudden on a hill!
Lead Driver
Joined: May 2007
Posts: 6,993
Likes: 15
From: Costa Mesa, CA
Had that happen too (well, no fire but the red pipe) on a different truck years ago!
Coming home from the mountains on valentines day at about 10 PM or later. Stopped at every gas station I found and used the water there to cool the thing down so I could drive to the next one. That drive SUCKED! What is normally a 2 hr. drive took over 4 if I remember right. Gotta love things that go wrong when no shop is open & when you have no tools! Truck didn't catch fire though luckily!
Coming home from the mountains on valentines day at about 10 PM or later. Stopped at every gas station I found and used the water there to cool the thing down so I could drive to the next one. That drive SUCKED! What is normally a 2 hr. drive took over 4 if I remember right. Gotta love things that go wrong when no shop is open & when you have no tools! Truck didn't catch fire though luckily!
Lead Driver
Joined: Mar 2010
Posts: 5,250
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From: West Virginia
Yep, also a very common way to misdiagnose very retarded timing (red hot exhaust pipes leading into the cat).
but in your case, Id agree with chase, the innards are gone, rattling around, and will pack themselves into the case outlet and your muffler if you have a normal one. Time for a new cat if you live in smog country or care about air quality, or time for a straight pipe if not.
but in your case, Id agree with chase, the innards are gone, rattling around, and will pack themselves into the case outlet and your muffler if you have a normal one. Time for a new cat if you live in smog country or care about air quality, or time for a straight pipe if not.
Post Fiend
Joined: Dec 2007
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From: Lost
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Posting Guru
Joined: Nov 2008
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From: Halifx Pa
+1, you wont find that here in Pa either. My 77 is non catalytic which I love.
The OP is listed as living in Greenville SC so I don't know what their restrictions are there.
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Cargo Master
Joined: Oct 2011
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From: Kenner,La.
noisy converter
My son's first car was a 86 Crown Victoria, when the cats started rattling I had him remove them and we opened them up to clean them out, afterward I got out the welding torch and set him up so he could teach himself to gas weld. He never forgot that. Kenny Nunez
Lead Driver
Joined: May 2007
Posts: 6,993
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From: Costa Mesa, CA
are the chunked up ones still worthwhile to the scrappers? I know the stuff in the internals is what brings the $$, but I didn't know if it started breaking down if it was still worth $.
Either way - I second what the guys are saying - if you don't have an inspection requiring them in your state just cut them off & enjoy the nice exhaust tone that comes when they're gone
Either way - I second what the guys are saying - if you don't have an inspection requiring them in your state just cut them off & enjoy the nice exhaust tone that comes when they're gone
Elder User
Joined: Aug 2011
Posts: 685
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From: Cape Coral, Florida
1975 f250 + cat =odd. so it's unleaded only?
quote from "NumberDummy"
Quote:
<TABLE border=0 cellSpacing=0 cellPadding=6 width="100%"><TBODY><TR><TD style="BORDER-BOTTOM: 1px inset; BORDER-LEFT: 1px inset; BORDER-TOP: 1px inset; BORDER-RIGHT: 1px inset" class=alt2>Originally Posted by bmuhlbach
cars started cats in 75. trucks in 79
except heavy duty
</TD></TR></TBODY></TABLE>
First year for catalytic converters in F100's: 1975 w/300/302/360/390's.
First year for catalytic converters in F150's: 1977 w/351M/400's.
First year for catalytic converters in F250's: 1977 w/351M/400 Regular/Super Cabs only.
First year for catalytic converters in F350's: 1977 w/351M/400's.
Info source; 1973/79 Ford Light Truck Parts Catalog / Exhaust System Application Charts / Section 52.1; Pages 2 thru 7.
<!-- / message --><!-- sig -->__________________
Bill // Retired Ford Parts Manager // SoCal Chapter member // Part Number Research: 1928/2001 FoMoCo vehicles.
quote from "NumberDummy"
Quote:
<TABLE border=0 cellSpacing=0 cellPadding=6 width="100%"><TBODY><TR><TD style="BORDER-BOTTOM: 1px inset; BORDER-LEFT: 1px inset; BORDER-TOP: 1px inset; BORDER-RIGHT: 1px inset" class=alt2>Originally Posted by bmuhlbach
cars started cats in 75. trucks in 79
except heavy duty</TD></TR></TBODY></TABLE>
First year for catalytic converters in F100's: 1975 w/300/302/360/390's.
First year for catalytic converters in F150's: 1977 w/351M/400's.
First year for catalytic converters in F250's: 1977 w/351M/400 Regular/Super Cabs only.
First year for catalytic converters in F350's: 1977 w/351M/400's.
Info source; 1973/79 Ford Light Truck Parts Catalog / Exhaust System Application Charts / Section 52.1; Pages 2 thru 7.
<!-- / message --><!-- sig -->__________________
Bill // Retired Ford Parts Manager // SoCal Chapter member // Part Number Research: 1928/2001 FoMoCo vehicles.
Thread Starter
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Junior User
Joined: Mar 2012
Posts: 91
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From: Greenville, SC
Wow this post blew up quick hahahahaha thanks for all the input. Like i said i know the exhaust tips are after market so my best guess is that the pipes are too. but i will take a picture some time and ya'll can see for yourselves. The previous owner lived in Alabama anybody know if they have emissions test there. In Greenville SC we dont have emissions tests.