08 MCX Exhaust -- how hot is too hot?

[jsnipes]

I took the maiden on my 08 X-2 today and observed similar smoking of the rubber hose and smell. I kept a close eye on it and all seemed OK. I made frequent inspections in the engine area and stopped often to let the engine idle and cool down, per break in procedure.

I followed the break in procedure and at about 4 hours I noticed that the engine seemed to be "lope-ing" ... sounded like a hot rod car. I took a look under the engine cover and found that a hole had formed on the starboard hose just below the clamp. I was close to the marina and took it in ... a little bit of exhaust was being shot onto the plastic side wall of the engine compartment. We'll see what the dealer says tomorrow.

No issues otherwise ... I could tell when the hole formed by the sound. Engine temp never went over 160. Otherwise a great day out. Kinda makes me disappointed in MC though.

Anyone else have any other observations?

JS

[jsnipes]

sorry, double post.

[Holman J.B.F]

last week we took my friends 08 x-15 with a mcx ,it took about 1 hour before the exhaust hose had a big hole in it.It is stil at the dealer.
1.5 hours never got above 160.port side hose right after the cats on the left side.(seen from the platform)

[TMCNo1]

I took the maiden on my 08 X-2 today and observed similar smoking of the rubber hose and smell. I kept a close eye on it and all seemed OK. I made frequent inspections in the engine area and stopped often to let the engine idle and cool down, per break in procedure.

I followed the break in procedure and at about 4 hours I noticed that the engine seemed to be "lope-ing" ... sounded like a hot rod car. I took a look under the engine cover and found that a hole had formed on the starboard hose just below the clamp. I was close to the marina and took it in ... a little bit of exhaust was being shot onto the plastic side wall of the engine compartment. We'll see what the dealer says tomorrow.

No issues otherwise ... I could tell when the hole formed by the sound. Engine temp never went over 160. Otherwise a great day out. Kinda makes me disappointed in MC though.

Anyone else have any other observations?

JS

We need pictures so we can see the smell of the new paint, "New Boat Smell" and all the other stuff that makes the hole in the exhaust hose.

[Roonie's]

I know on my 07 X2 the exhaust hose in kinked similar to your pic. No problems on holes as I have about 40 hours on it now and don't expect any problems. No burning rubber smell either just the burning paint smell described by Jim. Maybe a new problem with the 08's?

[jsnipes]

Funny, TMCNo1!

I just spoke with my dealer and here's what he said ... I can only assume that this is accurate.

He has seen a hole develop in one other boat. The issue appears to be due to a lack of enough water flow to keep the manifold below "rubber burning" temps. The lack of water flow stems from a weld that was added in the manifold ... the sensor on top of the manifold needs to stay dry and they added an inner thin wall tube to accomplish this. If the weld is not to spec then it can restrict flow. He was not sure of the scope of the issue ... he's only seen it once before and MC has issued no service bulletins, etc. The first go around they just replaced the rubber exhaust hose which burnt through again (of course). He has since worked with MC to either replace the manifold or else fix the weld in it (not sure which was done). He is going to work with MC on mine this week to determine the course of action and get the part in to do the job.

I'll post what comes of this, but I'm glad that at least my dealer recognizes that there is a technical problem and is not just going to throw another hose on it. I'm disappointed that MC did not test waterflow through the manifold or else identify a potential problem on the water test. I mean, c'mon ... exhausts get hot ... it doesn't seem to hard to me to avoid this problem.

Still an MC fan, a little disappointed that my boat with less than 4 hours is headed back to the shop.

JS

[fbroen]

Thx folks for posting. Pls keep us updated.

Ours now has 11 hours on it. No hole in exhaust hose yet. Although by the looks of it in the kink, I fully expect a hole to develop sooner or later -- so, very interested in you all's developments.

Had ours break-in serviced, and hooked up to computer. No codes, and tech said he has seen the kinks elswehere, but no failings. Yet -- would be my guess.

[c_craig]

I mentioned this somewhere else, but same thing on my '08 X-15 today. 2.5 engine hours, our second brief trip to the lake, and we burned a hole in the port exhaust hose. Dealer was on the lake doing demos, so they looked at it right away. He thinks the manifold elbow is bad and needs to be replaced. Thinks the exhaust water is not circulating evenly, causing a hot spot on the hose. Interesting, he guessed "port side hose" as he approached the boat, and later said that seems to be more common, port side is always hotter?

[vision]

08 X-star with MCX. No holes in rubber exhaust tubes so hopefully ours will not develop this problem. But, several other minor to perhaps major (transmission) problems by 40 hours. I have to agree that for 08, MC quality control seems to have slipped. I had 500 hours on an 05 X2. Never a single problem. Love my MC, great dealer, but it is frustrating to lose lake time due to problems with a new boat.

[mbtka]

Seem's like this might be a problem. We are picking up our boat on Thursday and will see if we have the same problem with our MCX.

[erkoehler]

Should be a service bulletin along shortly from the sounds of it

We've had 1 boat come back as well.

[TheOneandOnly]

ERk-- we have 2.5 hrs on ours also 08x2, is this going to be a recall? Id like to get ours in if they need to change something especially since the weather is still crappy here in mn. Thx

[erkoehler]

Just keep an eye on it, they haven't released a bulletin/recall as of yet. Stay tuned!

[mbtka]

Have you had any problems with your's yet? This weather in MN is rediculous.

[TheOneandOnly]

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?