525 Header Failure??
05-31-2007, 01:52 PM
#21
Geronimo36
Gold Member
The CMI's don't fail from corrosion, they fail from vibration and heat cycling... They also are prone to failure if the header develops a hot spot. The hot spots are created two ways; first if there's an obstruction (rust chunk etc.), secondly if when they were manufactured the inner pipe is too close to the outer pipe..
Damn CMI's,,,, every week I fire up my engines I worry about these darn things.... I'll be purchasing Stainless Marines next go around...
Damn CMI's,,,, every week I fire up my engines I worry about these darn things.... I'll be purchasing Stainless Marines next go around...
05-31-2007, 02:14 PM
#22
CMI charged 100 dollars for the one fix, plus I had to pay for my shipping up there. They do not guarantee that they can fix it as well, it all depends where the crack is. Mine was easy because it was right where the 4 pipes merge into 1. Right along that weld. For the time being, I'm keeping my second set.
05-31-2007, 02:18 PM
#23
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a friend of mine with an 05-06 39 Gun is about ready for his 3rd set...1st ones cracked, gottum warrantied last season and already this season same header, same crack , same place...things that make ya go hmmmm
05-31-2007, 02:30 PM
#24
Geronimo36
Gold Member
Ken - I have a sneaking suspicion that mine are probably going to go this summer based on everyone elses experience. Did the TIG welding at least let you finish out the summer before you had to replace all the headers? Is there an alternative to the CMI's? We all spend WAY too much money to have these things fail the way they do. 
http://www.offshoreonly.com/forums/s...ad.php?t=27458
05-31-2007, 03:50 PM
#25
Geronimo36
Gold Member
FYI, I think the stainless marine GenIII's are also cheaper than a CMI setup. I think they're somewhere around $3600 complete with tailpipes to your specs.
05-31-2007, 07:01 PM
#26
Charter Member
Charter Member
I've had great luck with KE headers, they are not the eyecandy that CMIs are, BUT I ran a set in Salt water for 7 years, (flushed every time) and they performed AWESOME. Plus they make great power. When I repower the nordic, it will be with either KE's or SM.
Dean
Dean
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Everything is for sale @ a certain $$
Everything is for sale @ a certain $$
05-31-2007, 09:40 PM
#27
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Anyone know anything or got any experience with the headers on 525's failing due to corrosion. I've got one that basically turned to swiss cheese in about a two to three square inch section in the top of one of the tubes. I've heard rumblings that there have been problems with corrosion at other points (flanges) resulting in sea water leaking back into the head/cylinders. The reason for my question is I'm simply wondering if my other three headers are time bombs. At better than 4K a piece I'm not in a hurry to replace, but I certainly don't want to drown one of the motors either.
Thanks in advance.
C.
Thanks in advance.
C.
05-31-2007, 09:46 PM
#28
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Sold lots of 525's. Never a failure in freshwater.Lots of failures in saltwater. Go figure,saltwater is the enemy,but you would expect good maintenance would help,apparently not with these headers
06-01-2007, 08:49 AM
#29
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06-01-2007, 09:18 AM
#30
Also a rough idle as well because of water dripping back in. That's what clued me in to something being wrong.
