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Canadian Poncho Homepage -> Canadian Poncho -> 65-70 Full Size Power Train Tech Forum -> Exhaust manifold heat riser valve explosion!
Post Info TOPIC: Exhaust manifold heat riser valve explosion!
4SPEED427


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Exhaust manifold heat riser valve explosion!
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So yesterday I pulled a pair of manifolds off an old seized 283. Naturally the heat riser valve is seized as they always seem to be. I thought I'd heat it to see if I could get the shaft to move. I'm glad I had glasses plus my tinted goggles on over them. As I heated it, suddenly it sounded like a gunshot and whatever is normally pressed into the manifold, I assume a bushing of some sort, literally exploded and hit me in the cheek as it went by. Any ideas what it's made of and why did it explode like that?

20230901_170739[1].jpg



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1966 Strato Chief 2 door, 427 4 speed, 45,000 original miles 

1966 Grande Parisienne, 396 1 of 23 factory air cars (now converted to a "factory" 4 speed)
beaumontguru


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That's wierd. I have gutted those many times and welded up the hole. Good to have the warning!!

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Beaumontguru

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65 SD L79


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almost sounds like there was an air pocket



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4SPEED427


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Thankfully it was pointed at the parts car and not one of our good vehicles. I heard it bounce off something (besides my face!) but I have no idea what or where. I'll likely find it sometime when I'm doing a cleanup.

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1966 Strato Chief 2 door, 427 4 speed, 45,000 original miles 

1966 Grande Parisienne, 396 1 of 23 factory air cars (now converted to a "factory" 4 speed)
LT1Caddy


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Carl...Isn't there a brass bushing for the rod to pivot on? Maybe not brass, probably just tin. I have heard of guys using penetrating oil on them over a number of days to get them freed up. They were hard to obtain a few years back as I remember...

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4SPEED427


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LT1Caddy wrote:

Carl...Isn't there a brass bushing for the rod to pivot on? Maybe not brass, probably just tin. I have heard of guys using penetrating oil on them over a number of days to get them freed up. They were hard to obtain a few years back as I remember...

 Not sure and it didn't leave enough of an indentation in my cheek to see what hit it!



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1966 Strato Chief 2 door, 427 4 speed, 45,000 original miles 

1966 Grande Parisienne, 396 1 of 23 factory air cars (now converted to a "factory" 4 speed)
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