08 MCX Exhaust -- how hot is too hot?

[c_craig]

Yes. Water and exhaust mix comes out of that hose (and into your engine compartment when you get a hole). Roll of duct tape would have been nice to have on the water. There's a thread for that too right? Another question I heard. Does the increase in exhaust temp cause a problem in the engine compartment? Is there enough fresh air moving through to keep the temp in check? I assume you can't / shouldn't run the blower all the time, or I'll be buying blower motors in bulk... Like the thing under my name says, "TT Newbie". We've been driving boats ('89 Tristar and others) for years, but this is our first as an owner.

[TheOneandOnly]

Yes. Water and exhaust mix comes out of that hose (and into your engine compartment when you get a hole). Roll of duct tape would have been nice to have on the water. There's a thread for that too right? Another question I heard. Does the increase in exhaust temp cause a problem in the engine compartment? Is there enough fresh air moving through to keep the temp in check? I assume you can't / shouldn't run the blower all the time, or I'll be buying blower motors in bulk... Like the thing under my name says, "TT Newbie". We've been driving boats ('89 Tristar and others) for years, but this is our first as an owner.

Roll of duct tape, I thought that was only used on bayliners? I run the blower all the time will not hurt anything its just a fan.
Ccraig what model/yr boat?

[c_craig]

'08 X-15. Thanks for the info.

[erkoehler]

Actually havent looked although Id only assume if there is a heat issue coming out of the exhaust its only a matter of time.

Does water come out of that hose? I really do not want to just keep an eye on it especially if it could cause some safety hazard for our family. If in any way it could cause a issue we will just wait until its fixed.

MN weather really makes us wonder why we still live here only 3 mths of warm weather id agree rediculous...

ERk is it on all mcx engines or just some?

Check with your local dealer, they'll be able to look at your boat to see if it has a problem.

As far as I know it is only SOME boats w/ the MCX experiencing issues.

[jkski]

'08 X-15. Thanks for the info.

C Craig,

You have a great looking boat and the people at Boat House Marine will make sure it is right. It's nice to have such a great dealership that knows the problem and can fix it on the spot.

[jsnipes]

My dealer said yesterday that they will be replacing the manifold on the side I was having problems on...the problem sounds like it's manifold specific as far as the weld tolerance so one side could be OK and the other side not. I'll let everyone know the results ...

Jamie

[mbtka]

I am going to ask my dealer as well when I pick up the boat on Thursday.

[jsnipes]

My advice is this ... if you start smelling burnt rubber and see wisps of smoke coming from one of the hoses, head for the marina and get it back to the dealer. I had an '06 X-15 from new and it never smelled that way. It had an MCX, but no cats. I can not say that the smell was exclusively coming from the "bad" side, but I can say that the only side with wisps of smoke was coming from the "bad" side. As you would expect, the smell and smoke was worst just after several minutes of running at speed. When I would pull back to idle to let the engine cool down the smell would become evident and I would open the engine cover and see the smoke ... just very small wisps of smoke, but noticeable. After idling for a few minutes the smoke would go away fairly quickly and the smell get less strong.

When the exhaust hose blew it was a very noticeable difference in sound at idle. It sounded more "hot rod" like. I didn't notice it while running ... only when I pulled back to idle. The amount of water coming from the hole was very minor .... mostly exhaust and a little water (probably some steam) hitting the plastic side wall of the engine compartment. It scarred up that plastic panel a little but not bad. The hole was pretty much straight sideways so nothing blowing up into my face or anything, but the hole could form in any orientation I guess.

Best of luck with yours ... it may be just fine. Mine was built in Nov/Dec '07 by the way. Maybe later ones are of less risk?? For those who have the issue, when was yours built?

Jamie

[mbtka]

I believe mine was built in Nov/Dec as well.

[c_craig]

Our dealer mentioned the same issue about welds and replacement of the manifold or related parts, but we're waiting to see right now. Are cats new to these engines? If so, when? Is that what causes such high exhaust temps? Same things when our hose opened up, mostly exhaust and just a little water spitting out the hole, which also led the dealer to believe the water is not circulating properly in the exhaust. With a hole in the hose, there should be substantial water coming out, like out the tail pipes I assume. We actually lost power when it went, like PP was stuck at 10 MPH. I was in the bow and did not notice the change in engine sound until I got behind the windshield. Either way, you'll know. We idled in with a sort of "Cigarette" sound to it!

[TheOneandOnly]

My advice is this ... if you start smelling burnt rubber and see wisps of smoke coming from one of the hoses, head for the marina and get it back to the dealer. I had an '06 X-15 from new and it never smelled that way. It had an MCX, but no cats. I can not say that the smell was exclusively coming from the "bad" side, but I can say that the only side with wisps of smoke was coming from the "bad" side. As you would expect, the smell and smoke was worst just after several minutes of running at speed. When I would pull back to idle to let the engine cool down the smell would become evident and I would open the engine cover and see the smoke ... just very small wisps of smoke, but noticeable. After idling for a few minutes the smoke would go away fairly quickly and the smell get less strong.

When the exhaust hose blew it was a very noticeable difference in sound at idle. It sounded more "hot rod" like. I didn't notice it while running ... only when I pulled back to idle. The amount of water coming from the hole was very minor .... mostly exhaust and a little water (probably some steam) hitting the plastic side wall of the engine compartment. It scarred up that plastic panel a little but not bad. The hole was pretty much straight sideways so nothing blowing up into my face or anything, but the hole could form in any orientation I guess.

Best of luck with yours ... it may be just fine. Mine was built in Nov/Dec '07 by the way. Maybe later ones are of less risk?? For those who have the issue, when was yours built?

Jamie

We did notice ours last week when we only put 2.5hrs on it it started to get more raspy, I was like cool it must be just getting somewhat broke in... Now we have to go look to see if it was melting...

Ours was built in Nov/Dec 2007... Wonder if we have a bad one also, wont be able to forsurely know until its gets nicer out.

Is it a extensive down time labor project?

[TheOneandOnly]

.....................................

[jsnipes]

I think the cats started in '07. My '06 did not have them. Not sure why we are just seeing this. Maybe there was a manifold design change.

I know what you mean on the "cigarette boat" sound. Was cool for a few seconds until I realized that there must be a reason for it!

JS

[TheOneandOnly]

Ours will more than likely fall into needing to be updated, going back to be inspected next week. Not a big deal though since the weather here in MN ***X...

[Reto]

I have the same problems with my 08 X-2.

A hole in the starboard exhaust hose. 10 hours young.