Invertaflow repair
Printed From: CorrectCraftFan.com
Category: Repairs and Maintenance
Forum Name: Engine Repair
Forum Discription: Engine problems and solutions
URL: http://www.CorrectCraftFan.com/forum/forum_posts.asp?TID=17465
Printed Date: November-18-2024 at 11:29am
Topic: Invertaflow repair
Posted By: Chris4x4gill2
Subject: Invertaflow repair
Date Posted: May-10-2010 at 2:53am
|
FInally got the boat running for the season and noticed a sizeable leak coming from the port exhaust hose where it comes in from the riser.
Pulled the hose and this si what i found: ] My plan is to get some exhaust tubing to fit the ID of the hole, get the shop to roll the edge slightly and then redo the fiberglass on top. ------------- /diaries/details.asp?ID=4472" rel="nofollow - '89 Ski Nautique 2001 |
Replies:
Posted By: Chris4x4gill2
Date Posted: May-10-2010 at 2:55am
 ------------- /diaries/details.asp?ID=4472" rel="nofollow - '89 Ski Nautique 2001 |
Posted By: Hawktique
Date Posted: May-10-2010 at 4:11am
|
I'm in the process of removing the invertaflo and going to a Y-Pipe down to the exhaust. ------------- "A Veteran is someone who at one point in his life, wrote a blank check made payable to: 'The United States of America,' for an amount of 'up to, and including his life." Semper Fi |
Posted By: Chris4x4gill2
Date Posted: May-10-2010 at 10:52am
|
Are you planning on bypassing the muffler altogether?
I had thought of that as an option, but was going to try to repair this first. ------------- /diaries/details.asp?ID=4472" rel="nofollow - '89 Ski Nautique 2001 |
Posted By: Hawktique
Date Posted: May-10-2010 at 11:52am
|
Yes I am. I'm taking out the invertaflo and having a straight pipe made in it's place (modified Y-pipe). Should get better sound and flow that way. ------------- "A Veteran is someone who at one point in his life, wrote a blank check made payable to: 'The United States of America,' for an amount of 'up to, and including his life." Semper Fi |
Posted By: behindpropeller
Date Posted: May-10-2010 at 3:15pm
I have that on my 176. Can't talk in the boat. Currently looking at muffler options. Tim ------------- |
Hawktique wrote:Posted By: kapla
Date Posted: May-10-2010 at 3:29pm
|
If you are handy on the FB job, the muffler is an easy fix.
As for removing the invertaflo, I also wanted to do something to raise the db a little but my concern about going the Y pipes, is it was going to be very loud. Instead I replaced the rubber carpeted hose that goes from it to the exhaust transom outlet, with a SS pipe. I now hove a deeper tone, and you can seat on the back and its ok. here´s a pic o my setup 
hope it helps ------------- <a href="">1992 ski nautique |
Posted By: Hawktique
Date Posted: May-10-2010 at 3:37pm
|
One of my other harps on the invertaflow, it sounds like a little smurf is in there pounding on the side like a drum. I've heard the stories of them going out, so I plan on eliminating it. If it's too loud, I could always splice in a 4" muffler where kapla has his stainless. ------------- "A Veteran is someone who at one point in his life, wrote a blank check made payable to: 'The United States of America,' for an amount of 'up to, and including his life." Semper Fi |
Posted By: Chris4x4gill2
Date Posted: May-10-2010 at 5:51pm
|
I'm fairly decent working with the fiberglass. It might not be pretty when I get done, but it should hold up. I think this will really be a pretty quick / easy fix. I'm going to try to size some metal exhaust piping to the ID of the inlets and then buildup on top of that with fiberglass. I'm hoping that will give me a stronger base to mount the hose and clamps to.
I'm still trying to figure out the best way to flare the metal tubing though. I need it to be just slightly rolled so it will not work its way into the muffler. I'm worried about this becasue the I dont think the Fiberglass will bond very well to the metal and I want to keep it from moving ------------- /diaries/details.asp?ID=4472" rel="nofollow - '89 Ski Nautique 2001 |
Posted By: 8122pbrainard
Date Posted: May-10-2010 at 6:18pm
Chris, I'm not following what the flare is for but to make just one, I'd just peen it in or out with the ballpeen hammer and the corner of a vise if a anvil isn't available. You want to remove this piece when done correct? The epoxy will want to stick to it. I'd grease it up and then try to remove it after the first layer of glass isn't fully cured. ------------- /diaries/details.asp?ID=1622" rel="nofollow - 54 Atom /diaries/details.asp?ID=2179" rel="nofollow - 77 Tique 64 X55 Dunphy Keep it original, Pete < |
Posted By: Chris4x4gill2
Date Posted: May-10-2010 at 7:41pm
|
Actually I was thinking leave it in. My thinking, it would help prevent the problem from happening again and also keep from collapsing the inlet on accident by over tightening the hose clamps on it.
Good Idea or bad? should I just re glass it and call it a day? ------------- /diaries/details.asp?ID=4472" rel="nofollow - '89 Ski Nautique 2001 |
Posted By: 8122pbrainard
Date Posted: May-10-2010 at 9:35pm
|
Chris,
Re reading, if you flange out, you won't be able to get it out anyway!! You could leave it in. I don't see a problem with that. ------------- /diaries/details.asp?ID=1622" rel="nofollow - 54 Atom /diaries/details.asp?ID=2179" rel="nofollow - 77 Tique 64 X55 Dunphy Keep it original, Pete < |
Posted By: Chris4x4gill2
Date Posted: May-10-2010 at 10:57pm
|
I'm starting cleanup of both inlets now, cutting away all of the rotten glass and what looks like a former patch job. There is a bondo like compound built up near where the end of the rubber exhaust hose would be when it is attached to the inlets. ------------- /diaries/details.asp?ID=4472" rel="nofollow - '89 Ski Nautique 2001 |
Posted By: Chris4x4gill2
Date Posted: May-10-2010 at 11:03pm
|
anyone know the ID size of the hose between the Invertaflow and the risers on the '89. I think 3" but dont have the hose here to double check. ------------- /diaries/details.asp?ID=4472" rel="nofollow - '89 Ski Nautique 2001 |
Posted By: Chris4x4gill2
Date Posted: May-11-2010 at 12:05am
|
got the cleanup done.
Before 
After  ------------- /diaries/details.asp?ID=4472" rel="nofollow - '89 Ski Nautique 2001 |
Posted By: M3Fan
Date Posted: May-11-2010 at 12:01pm
|
I'd stick a form of some sort in that hole that is close to the original ID, like a Coors Light can or balloon or something and just start wrapping new layers of glass around it. Of course after a few full wraps you'd have to focus on building layers of glass on that broken portion so you don't end up with an oblong shape. I believe those non-HO manifolds are 3" ID.
I'm sure the MANY fiberglass guys here will have all the details and suggestions you could ever want on how to rebuild this. ------------- 2000 SN GT40 w/99 Graphics/Gel 2016 SN 200 OB 5.3L DI https://forum.fifteenoff.com |
Posted By: 8122pbrainard
Date Posted: May-11-2010 at 12:24pm
|
Chris,
Reading Joel's comment regarding the oblong shape got me looking at the broken out spot again. To simplify and to keep it round, I feel you're better off cutting the whole "nipple" off the muffler. Then use the metal inside form and rebuild out the the proper ID of the hose. Get plenty of glass/resin build with a generous radius at the junction to the muffler itself. Prop/hold the metal form with something like a rod going into the muffler. Don't worry about flaging it. Then pull it out when the first layer of glass is almost cured. ------------- /diaries/details.asp?ID=1622" rel="nofollow - 54 Atom /diaries/details.asp?ID=2179" rel="nofollow - 77 Tique 64 X55 Dunphy Keep it original, Pete < |
Posted By: Chris4x4gill2
Date Posted: May-11-2010 at 2:03pm
|
Original Idea looks to be close to 2.75" I'll have to start scrounging the shop to see what I can find, But that was kind of the purpose for wanting to create the insert, to keep it round so it will seal properly, I know I will have do a thicker buildup on the cut away part to do that and I thought that would be the easiest way to keep the form correct. I just didnt plan on taking it back out afterwards.
BUT.....your arguments are persuasive. I'll start playing around with it more when I get home and see what happens. ------------- /diaries/details.asp?ID=4472" rel="nofollow - '89 Ski Nautique 2001 |
Posted By: Sephmu
Date Posted: May-11-2010 at 3:04pm
|
Chris,
I did almost the same exact repair on my Sport over the winter, but on the FB downpipes from riser to hose. One end had been crushed from overtightening just the same as yours. When I prepped I only removed the bad material exactly as you've done. In the end, it turned out to be a PITA to match the funky shape and didn't turn out quite as uniformly as I would have liked. Would have been much less headache to simply cut it back down to square and build it back. Don't get me wrong, the repair works great and is covered by new hose, but it took more time in the end to get it right with the "partial" prep, andddd, i know that ugly repair is lurking under there!! I'll put it on the list for next year.... |
Posted By: Chris4x4gill2
Date Posted: May-11-2010 at 4:52pm
|
Thanks for the input, guess I'll start looking ofr soemthing to use as a form when I get home. ------------- /diaries/details.asp?ID=4472" rel="nofollow - '89 Ski Nautique 2001 |
Posted By: 8122pbrainard
Date Posted: May-11-2010 at 5:01pm
|
Chris,
Cut up a "tin" can (or any light gauge sheet metal) and roll it to the diameter needed. Bolt or screw the lapped seam then when you want to remove it, unscrew and roll it in on itself. ------------- /diaries/details.asp?ID=1622" rel="nofollow - 54 Atom /diaries/details.asp?ID=2179" rel="nofollow - 77 Tique 64 X55 Dunphy Keep it original, Pete < |
Posted By: Chris4x4gill2
Date Posted: May-13-2010 at 10:54am
|
I cut the inlet down to about 1/2" from the main body of the muffler. I then took a coke can, cut the bottom out and split the side. I left the top intact to help it hold its shape better. Took resin and "kitty hair" and made a a paste to fill in the gap and then started wrapping with fiberglass cloth.
Once I got a few wraps on, I let it cure for about 2 hours. It had started to set so I pulled the can out and then let it sit for a few more hours to harden. Then went back and added more glass till I got to my thinckness. I think I might have gotten a little too thick, but htat ok since its slightly tapered. I expect the hose to go back on fairly well. I'll let it cur eall day today and then I'll cut it off at the right height and see what else needs to be touched up. Hopefully I'll be running this weekend. ------------- /diaries/details.asp?ID=4472" rel="nofollow - '89 Ski Nautique 2001 |