![]() |
Register or Log In To remove these advertisements. |
|
|
![]() |
|
Thread Tools | Display Modes |
|
![]() |
#1 |
Cultural Infidel
![]() Join Date: Jan 2007
Location: Clearwater, FL
Posts: 668
|
Unbelievable....broke an exhaust manifold
In all my 30+ years of working on and driving old vehicles, I have never seen this. Today it was about 90 degrees outside and after work I went to pick up 2 of my grandsons. They got in and I took off, in there parking lot there is a low spot that retains water after a rain. When I hit this water, it splashed up and hit the hot exhaust manifold, breaking it in half!, right above where the down pipe attaches. Has anyone ever heard of this? Are these ram horns readily available? I find this rather unbelievable, but it happened.
![]() -Mark
__________________
posted via La-Z-Boy -Mark 1972 C-10 Fleetside 350/TH350 PS PB A/C Cab Sadly....Sold ![]() 1968 Short Fleet 350/TH400 PS PB Delivered by Fine69 ![]() ![]() It may be that your whole purpose in life is simply to serve as a warning to others. A man is not complete until he is married -- then he is finished. |
![]() |
![]() |
![]() |
#2 |
Senior Member
Join Date: Jan 2003
Location: daytonabeach
Posts: 22,956
|
Re: Unbelievable....broke an exhaust manifold
yep it happens alot on the older stuff from the 30's thru50's it was a pretty normal deal// ramshorns are readily available (try ebay craigslist and the hamb)used and in fact they're repoping a new version for the rodders that speddway motors sells in either castiron or polished stainless
__________________
71c-10 350/2004r/4:11 lowered3/4 longbed/dead by hurricane MEANING OF DEATH::::: SOMEBODY ELSE GETS YOUR STUFF DONT BELIEVE EVERYTHING YOU THINK TAKE MY ADVISE;I DON'T USE IT ANYWAY |
![]() |
![]() |
![]() |
#3 |
Registered User
Join Date: Apr 2006
Location: Boyertown Pennsylvania
Posts: 37
|
Re: Unbelievable....broke an exhaust manifold
Mark,
Been there, done that. I was able to get another manifold, no problem. Ray ![]() |
![]() |
![]() |
![]() |
#4 |
Cultural Infidel
![]() Join Date: Jan 2007
Location: Clearwater, FL
Posts: 668
|
Re: Unbelievable....broke an exhaust manifold
That looks too familiar. Mine broke straight across.
-Mark
__________________
posted via La-Z-Boy -Mark 1972 C-10 Fleetside 350/TH350 PS PB A/C Cab Sadly....Sold ![]() 1968 Short Fleet 350/TH400 PS PB Delivered by Fine69 ![]() ![]() It may be that your whole purpose in life is simply to serve as a warning to others. A man is not complete until he is married -- then he is finished. |
![]() |
![]() |
![]() |
#5 |
I am a Referee of life.
Join Date: Jun 2000
Location: Greensboro N.C.
Posts: 13,993
|
Re: Unbelievable....broke an exhaust manifold
Wow,one of the guys at work just asked me today if I ever heard of a manifold cracking.I said sure the old cast iron does that.He said no it's aluminum and it's cracked so bad the carb is the only thing holding it together.I haven't ever heard of an intake manifold cracking before have any of you?
__________________
The 47-present Chevrolet and GMC Truck Message Board Network,it's owners,moderators,members,and associates of any type should not be held responsible for my opinion. You can't fix stupid,not even with duct tape. "My appearance is due to the fact that "GOD" does punish you for having too much fun!" Barrett-Jackson has perfected alchemy,they make rust into gold! "You can lead a horse to water but you can't saddle a duck" "Cleverly disguised as a 'Responsible Adult' "Sometimes your Knight in shining armor is just a retard in tinfoil" Last edited by PanelDeland; 07-12-2007 at 08:20 PM. |
![]() |
![]() |
![]() |
#6 |
Friday's Toy
![]() Join Date: Nov 2006
Location: Ovilla, TX
Posts: 574
|
Re: Unbelievable....broke an exhaust manifold
I had a 85 Turd Ranger in high school. It was a great beater. I had the driver side manifold bottom 1/2. not the flange area, break and fall off. It was only due to me making the straight exhaust backfire while going down the road, man was that loud.....Mikey
|
![]() |
![]() |
![]() |
#7 |
its all about the +6 inches
Join Date: Jan 2001
Location: Hilliard Ohio
Posts: 2,693
|
Re: Unbelievable....broke an exhaust manifold
I know they'll break like that if you remove the tranny and let the exhaust hold all the weight.
|
![]() |
![]() |
![]() |
#8 |
Senior Member
Join Date: Sep 2004
Location: CANADA
Posts: 1,681
|
Re: Unbelievable....broke an exhaust manifold
|
![]() |
![]() |
![]() |
#9 |
Senior Member
![]() Join Date: Dec 2006
Location: Studio City, Calif.
Posts: 2,873
|
Re: Unbelievable....broke an exhaust manifold
I have a big crack in mine. I didn't realize that the torque spec on these (according to the 1969 GM shop manual) is only 30 ft.lbs (inner) and just 20 ft. Lbs (outer bolts).
I read somewhere that it's good to check with a staight-edge and correct as necessary before installing a used rams horn.
__________________
'69 GMC C2500 Custom Camper, 8 1/2' bed, New GM 350, NP 435 Close Ratio 4spd. Trans., 3.73 Dana-60 open.Camper and Trailer wiring, PS, PB, AC, tach , three gas tanks, stereo speakers, 2nd owner, Work-Truck supreme. Last edited by WorkinLonghorn; 07-12-2007 at 11:47 PM. |
![]() |
![]() |
![]() |
#10 |
MOVE OVER
Join Date: Jun 2002
Location: Warrensburg, MO
Posts: 5,470
|
Re: Unbelievable....broke an exhaust manifold
I've had one break to, on the surburban, and I was actually paying someone to rebuild the tranny, and he didn't remove the exhaust and it broke the manifold! of course, it was already broke according to him... I dont do business with him anymore...
__________________
No matter where you are..... There you are... Buckaroo Banzi |
![]() |
![]() |
![]() |
#11 |
Having issues
Join Date: Jul 2005
Location: Eldorado Ca, an hour east of sacramento
Posts: 696
|
Re: Unbelievable....broke an exhaust manifold
All you would have to do is look at the broken part. If there is carbon buildup anywhere on the part, I would not expect him to pay for a manifold. If it was shiney all around the break, I would expect him to fix it, for free. If he refused, well, lets just say that it would cost him more money to NOT fix it, than it would have if he had admitted to his mistake and done the right thing.
|
![]() |
![]() |
![]() |
#12 |
Registered User
Join Date: Jun 2002
Location: Southern California U.S.A.
Posts: 276
|
Re: Unbelievable....broke an exhaust manifold
I have broke several ramhorn exhaust manifolds (on both sides, but never at the same time) on my 68 over the last 2 years. I have replaced them with "junk yard finds" so I don't know if its due to age of the casting or some other reason. I have checked the engine mounts & all the hangers on the exhaust system without finding any obivious problems. Maybe new manifolds are the way to go. Any suggestions?
|
![]() |
![]() |
![]() |
#13 |
Registered User
Join Date: Feb 2000
Location: Center City, MN, USA
Posts: 3,254
|
Re: Unbelievable....broke an exhaust manifold
When my buddy that does machine work dropped off my 383 block he said to be careful not to torque the bolts on the exhaust manifolds too tight. They can break if too tight and then go through a few hot/cold cycles. I never broke one but it happens.
__________________
'70 cab, '71 chassis, 383, TH350, NP205. '71 Malibu convertible '72 Malibu hard top Center City, MN |
![]() |
![]() |
![]() |
#14 |
Special Order
![]() ![]() Join Date: Nov 2004
Location: Mt Airy, MD
Posts: 85,858
|
Re: Unbelievable....broke an exhaust manifold
Metal fatigue/old age.I`ve had more manifolds break than problems with headers,I don`t care who says what.True,a header would not last 30+ years,though.Today`s cast is nowhere as good as the older stuff,either.
__________________
"BUILDING A BETTER WAY TO SERVE THE USA"......67/72......"The New Breed" GMC '67 C1500 Wideside Super Custom SWB: 327/M22/3.42 posi.........."The '67" (project) GMC '72 K2500 Wideside Sierra Custom Camper: 350/TH350/4.10 Power-Lok..."The '72" (rolling) Tim "Don't call me a redneck. I'm a rough cut country gentleman" R.I.P. ~ East Side Low Life ~ El Jay ~ 72BLUZ ~ Fasteddie69 ~ Ron586 ~ 67ChevyRedneck ~ Grumpy Old Man ~ |
![]() |
![]() |
![]() |
#15 |
Sierra Grande Club
Join Date: Jan 2007
Location: New Mexico USA
Posts: 2,433
|
Re: Unbelievable....broke an exhaust manifold
So with this talk of cracking manifolds….I have some questions.
I plan on reinstalling my manifolds and was wondering what special steps need to be done. I think I have them marked from what side it came off, but do I need to have them checked for flatness or anything? What torque should be used? I also plan on installing them without the gasket or heat riser. Good or bad? s/t
__________________
1971 GMC Sierra Grande, 1/2 ton short wide, original 4 bolt 010 020 block & heads. (matching #'s). 383 stroker, SMI q jet 750 cfm, Lunati Voodoo 60102 cam, Scorpion roller rockers, Spin Tech pro street mufflers with X pipe. ![]() |
![]() |
![]() |
![]() |
#16 |
Registered User
![]() Join Date: Apr 2005
Location: Brookings_South Dakota
Posts: 43
|
Re: Unbelievable....broke an exhaust manifold
It's okay not installing a heat riser, but you'll need the gaskets, or you'll definetally be hearing it when you start it up, they not like the new fords that run no gaskets on their 4.6's and 5.4's. If you don't you'll probably be hearing a ticking when you start it up.
__________________
01 Pontiac Bonneville SLE 62 Studebaker GT Hawk 72 GMC C20-327/th350 81 Chevy c10 84 Monte Carlo SS 70 Ford 3/4ton 4X4 Highboy 390/bedhoist 68 Mercury Cougar GT |
![]() |
![]() |
![]() |
#17 | |
Sierra Grande Club
Join Date: Jan 2007
Location: New Mexico USA
Posts: 2,433
|
Re: Unbelievable....broke an exhaust manifold
Quote:
Do you have an OEM part #? ![]() s/t
__________________
1971 GMC Sierra Grande, 1/2 ton short wide, original 4 bolt 010 020 block & heads. (matching #'s). 383 stroker, SMI q jet 750 cfm, Lunati Voodoo 60102 cam, Scorpion roller rockers, Spin Tech pro street mufflers with X pipe. ![]() |
|
![]() |
![]() |
![]() |
#18 |
Official Site Guitar Shredder
Join Date: May 2006
Location: Oz
Posts: 3,955
|
Re: Unbelievable....broke an exhaust manifold
this is crazy, i have never heard of this . i have been hanging on to mine for 10 years, and 2 engines, i dont want the hassle of headers and everyone has told me that the (ram horns) are the fastest flowing stock manifolds out there. is there any way to make shure this doesnt happen (i e) coatings? or is it just luck of the draw??
|
![]() |
![]() |
![]() |
#19 |
Too many projects
Join Date: Mar 2004
Location: Fargo, ND land of the flat hills
Posts: 1,147
|
Re: Unbelievable....broke an exhaust manifold
I cracked one a few years back, but replacements are easy to find and easy to put in, so I don't worry about it happening in the future. Just another querk of old stuff.
__________________
Andrew 84 GMC C1500 SWB 6.2 Diesel/700R4/3.42 "Grandpa's odd duck" |
![]() |
![]() |
![]() |
#20 |
Registered User
Join Date: Apr 2006
Location: oklahoma
Posts: 10,670
|
Re: Unbelievable....broke an exhaust manifold
I have done it to. Broke in about the same place as d4xycrq shows in his photo. Except mine was on the driver side. Hit a chug hole before a bridge back in 2000 and broke it. They are notorious for cracking there. And they are easy to find new or used ones.
|
![]() |
![]() |
![]() |
#21 |
Registered User
Join Date: Aug 2002
Location: Hickory, NC.
Posts: 776
|
Re: Unbelievable....broke an exhaust manifold
This happens alot. If you look at a good one you will probably see alot of tiny cracks just above where it turns back. I had a 70' and the drivers side broke while I was going down the interstate. I have never had any problems with 4x4 manifolds.
|
![]() |
![]() |
![]() |
#22 |
Cultural Infidel
![]() Join Date: Jan 2007
Location: Clearwater, FL
Posts: 668
|
Re: Unbelievable....broke an exhaust manifold
Nothing like the feeling of not being alone.
![]() I went ahead and bought a new one. I twisted the head off of the center rear bolt removing the old one, so out came the BFH and it came apart in no time! The bolt was seized in the old manifold, so I turned what was left of the manifold until the bolt was free. The break in the manifold looked like it had been cracked for a while, only part of the metal was shiny. Just for kicks I decided to check the plugs while I had such easy access, and I found the worst looking plugs I have ever seen in a running engine. So tomorrow it's new plugs and new bolts. Maybe I'll have this "easy" repair done soon. Thanks for all the replies. -Mark
__________________
posted via La-Z-Boy -Mark 1972 C-10 Fleetside 350/TH350 PS PB A/C Cab Sadly....Sold ![]() 1968 Short Fleet 350/TH400 PS PB Delivered by Fine69 ![]() ![]() It may be that your whole purpose in life is simply to serve as a warning to others. A man is not complete until he is married -- then he is finished. Last edited by Piece of Work; 07-14-2007 at 08:29 PM. |
![]() |
![]() |
![]() |
#23 |
Active Member
![]() Join Date: Dec 2003
Location: Waterbury, CT
Posts: 591
|
Re: Unbelievable....broke an exhaust manifold
Don't mean to be a wise guy but the bracket in the picture holding the A/C compressor look like the wrong one for the exhaust manifold. It looks like the bracket that is supposed to be on the intake manifold that supports the compressor. Could be the wrong bracket put too much stress on the exhaust manifold. If you look at the pic you can see that the compressor is not directly bolted to the bracket. Looks like they used the A/C compressor bracket shims to make up the difference.
|
![]() |
![]() |
![]() |
#24 |
Registered User
Join Date: Jun 2007
Location: Georgetown , TX
Posts: 166
|
Re: Unbelievable....broke an exhaust manifold
yeah me and a buddy of mine broke one when we hit a bump in a field in his 67. we found new ones for his and my 71 in an LMC Truck catalog
__________________
70 Chevy C-10 short step 250/3 on the tree Owned: 71 longbed Cheyenne 70 swb |
![]() |
![]() |
![]() |
#25 |
Senior Member
![]() Join Date: Sep 2005
Location: Lewisville, Nc
Posts: 10,234
|
Re: Unbelievable....broke an exhaust manifold
www.partstrain.com has them pretty cheap
__________________
David fuller Ase Certified Mechanic Click here to help support our board!! 1971 Chevy c-10 under going a 4.8l LSx swap Build Thread http://67-72chevytrucks.com/vboard/s...d.php?t=421305 2007 Honda Accord my daily 145kmiles 2002 Honda Accord 4 door With 330k(sisters car) 2005 toyota Avalon 228k( brothers car) 2002 Sububran 5.3 245k 2000 Tahoe 5.3l 378 General manager for Marco's Carwash & lube |
![]() |
![]() |
![]() |
Bookmarks |
|
|