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-   -   Exhaust Headers / 525 Mercury Racing Engines (https://www.offshoreonly.com/forums/general-q/241634-exhaust-headers-525-mercury-racing-engines.html)

pm203 12-29-2010 08:13 AM


Originally Posted by Dean Ferry (Post 3284824)
We went and looked at a 07 38 Donzi zr last Thursday, (the 23rd, my b-day) and the boat is a dealer demo, with 22 hours on it, and the bottom line for us was the cabin is a little too small for our family, and with this header issue still being a problem, I couldn't really buy the boat and not worry about the exhaust issue. I mean in my eyes, it defeats the purpose of buying a new boat with warranties.....
Dean

Dean,

Do not let the header issue deter you from buying a boat. There are lots of these headers with lots of hours that have been fine. I know its a problem for alot of people, but don't let headers dictate what kind of boat you buy.

Mykalvballer 12-29-2010 08:14 AM

To answer the question about 600's or 700's. YES it WILL happen to them as well. Speaking from experience!

2 Gone now on 700's - this is getting out of control.....

Knot 4 Me 12-29-2010 08:30 AM


Originally Posted by kreed (Post 3284831)
Stainless Marine Generation 3 exhaust is what lots of people are going to. Im considering it too. Not as much bling, but fully functional and worry free. HP loss doesnt seem to be an issue either. Have seen some powdercoated to match engine color and they dont look too bad! I will sacrafice some bling for the life of my engine.

+1. How often do you have the hatch up staring at your mills? In an offshore boat, give me function over form every day of the week.

Tom A. 12-29-2010 08:41 AM

1 Attachment(s)
I don't know if anyone else here has done this but my mechanic installed a set of header drains to my boat and probably a dozen other boats here in NJ. It works great to remove the standing water in the pipes so it doesn't lay in there.
You can see a pair of through hull fittings be each tab. I don't have any inside pics to show where they drain from.

bbcmi 12-29-2010 08:46 AM


Originally Posted by thirdchildhood (Post 3284839)
$300 a year plus over $100 shipping back and forth when I can do it in a vat of water? I don't see how their pressure testing will be any better. I move them around in the water and give them plenty of time to show bubbles. Besides, I don't have a lot of trust in CMI anymore. OEM specs? Either they leak or they don't!!

With the incorrect amount of testing pressure and improper preparation, as in carbon removal on the inside of the header (where one should be most concerned of a leak) you can keep doing it yourself and hope your doing it how it should be done....

‎"Don't find fault, find a remedy; anybody can complain"
— Henry Ford

Dave M 12-29-2010 09:02 AM


Originally Posted by bbcmi (Post 3284652)
Thirdchildhood; Although you may feel this is a good way to test, I would highly suggest sending them back to the factory as they have the correct equipment and process to test them to OEM specification. Properly cleaning and amount of pressure will change the results as well as the position they sit in the water will change the results!! They charge $150 a header plus shipping to properly inspect them, sounds like a GREAT value to me!

A few ???s

What's the turn around time on the testing?

Are most leaks repairable?

If so, what's the average repair cost?

Dave M 12-29-2010 09:04 AM


Originally Posted by Tom A. (Post 3284874)
I don't know if anyone else here has done this but my mechanic installed a set of header drains to my boat and probably a dozen other boats here in NJ. It works great to remove the standing water in the pipes so it doesn't lay in there.
You can see a pair of through hull fittings be each tab. I don't have any inside pics to show where they drain from.

Is that in addition to pulling the blue plastic wing nuts? It seems easy enough to do it that way.

thirdchildhood 12-29-2010 09:08 AM

:coolcowboy:

thirdchildhood 12-29-2010 09:09 AM

:coolcowboy:

PhantomChaos 12-29-2010 10:47 AM


Originally Posted by bbcmi (Post 3284658)
Smitty; A proper flushing is a good start to the life of your exhaust, CMI has put together some videos on the difference of water pressure and water FLOW, Flow is the key, pressure doesn't really tell you what is happening when a pump is on its way out or if a heat exchanger is getting plugged up.
Here are the links;
http://www.youtube.com/watch?v=HWGcvwHZSE8
http://www.youtube.com/watch?v=vXB5RRwC_l8
Check them both out.

Interesting videos. Thanks.

I was going to send my HP500EFI headers to Teague to test and clean.....maybe not? Where are you guys located?


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