1997 Muffler
Printed From: CorrectCraftFan.com
Category: Repairs and Maintenance
Forum Name: Boat Maintenance
Forum Discription: Discuss maintenance of your Correct Craft
URL: http://www.CorrectCraftFan.com/forum/forum_posts.asp?TID=37750
Printed Date: November-16-2024 at 10:44pm
Topic: 1997 Muffler
Posted By: wetskier2000
Subject: 1997 Muffler
Date Posted: November-30-2015 at 1:27pm
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I need to diagnose possible exhaust issues in my 1997 SN, GT40. My wife thinks the muffler is going as the sound of the boat seems to have changed. She also is concerned that black stains on the carpet around the engine cover might be exhaust. Here's my take.. The bilge isn't a black mess. The areas rarely cleaned around the rudder are typical dark bilgey gook, not what I would think exhaust would look like. The replacement muffler is 600 bucks. Ouch.. If it was cheap, I'd just throw one at the problem. - can I pressure test the monster muffler that I have now? How? - Anyone done a replacement on one of these to something with a little more... ahem... "agressive"?  ------------- Current: 1997 Nautique Previous: 1987 Nautique 1964 American Skier |
Replies:
Posted By: 8122pbrainard
Date Posted: November-30-2015 at 2:15pm
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Rick, A pressure test won't show anything except for an external crack. If it wasn't leaking and the engine only sounds louder, then I'd say there are some internal baffles that have broken. Have you had any engine problems that would cause back firing? That has been reported as damaging mufflers. If you want to make your wife happy  and save some bucks, cut it open and take a look. If baffles are broken they can be glassed back in and the cut out section glassed back together. Make sure you post pictures if you do it.Unless the engine is running real bad causing it to run real rich, I doubt the black stains are exhaust plus, you would notice an exhaust leak. I'd say it's black smut from your accessory belt(s). Check them for condition and tightness. ------------- /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: wetskier2000
Date Posted: November-30-2015 at 2:51pm
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Hmmmm... Now that you mention it, I have had a rich condition on occasion... It used to happen at restart after skiing half the day... cough, belch, BLACK SMOKE! Shut it off, start it back up and it ran fine til the next time. I have since narrowed this down to the temp sender. I cleaned and tightened the connection to the unit on the block and the problem went away for almost a year. I had thought a leak also since I've been getting a fair amount of water in the bilge when skiing. But it's always cold water so I don't think it's from the muffler and as you saw in the other thread, I'm also addressing the rudder packing material. But you bring up a VERY good point.. Not only could I inspect the baffles, but a person also could remove some if they were so inclined. Am I correct in assuming that's all that's in there is glass mat and resin? ------------- Current: 1997 Nautique Previous: 1987 Nautique 1964 American Skier |
Posted By: 8122pbrainard
Date Posted: November-30-2015 at 3:35pm
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Rick, Since a baffle repair is relatively small, there are fiberglass repair kits available that include the needed resin hardener and cloth. Most on line marine supplies will have them. Even your local auto parts store would probably have one. ------------- /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: 74Wind
Date Posted: November-30-2015 at 3:48pm
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Or.... a person could just remove the mufflers if "so inclined". Didn't you imply you wanted something more "aggressive" anyway? LPSL. .. ------------- 1974 Southwind 18 1975 Century Mark II |
Posted By: wetskier2000
Date Posted: December-01-2015 at 11:41am
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I don't think removing the muffler completely is in the cards.. I've gotten as far as "It seems important to you to have a little more growl from the boat so that's fine, although I like it quiet like it has always been". That translates to, if I'm going to make it louder, it better be "just a little".... We don't ski at zero-dark-hundred so that's not an issue. ------------- Current: 1997 Nautique Previous: 1987 Nautique 1964 American Skier |
Posted By: JayG80
Date Posted: December-03-2015 at 12:06pm
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Discussion and video about rebuilding Hull Hugger muffler https://onedrive.live.com/?authkey=%21ADyhUvRGnXZl56k&id=F02B1D32FD09ADF0%213381&cid=F02B1D32FD09ADF0" rel="nofollow - Fiberglass Repair on Hull Hugger Muffler http://www.planetnautique.com/vb5/forum/nautique-topics/maintenance-technical-discussion/29556-muffler-rattle-not-against-the-hull" rel="nofollow - Planet Nautique Muffler Repairs ------------- 2007 Ski 2002 Ski |
Posted By: wetskier2000
Date Posted: December-09-2015 at 11:34am
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I pulled the muffler last night and the flat panel "baffle" seems to have the same oil-canning sound that the video above shows. Next step will be to cut it open and see what's what... I presume I'll find the same disconnected areas the guy in the video did.. My thought is to repair that, but also drill some holes in it to get a bit more growl. I have no idea how well this might work, but I've done it on a motorcycle exhaust on a VMax and the results were very good. Any ideas? ------------- Current: 1997 Nautique Previous: 1987 Nautique 1964 American Skier |
Posted By: JayG80
Date Posted: December-09-2015 at 11:53am
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Also look for any areas on the underside of the muffler that may be worn thin from rubbing against the hull. With the muffler out, I put a flashlight inside my muffler at night and could really see the thin spots well. Replaced the rubber pads under the muffler where it was rubbing. My engine had a loss of power due to blocked baffle. See the thread. http://www.planetnautique.com/vb5/forum/nautique-topics/maintenance-technical-discussion/463173-ski-nautique-bad-muffler-kills-horsepower" rel="nofollow - Bad Muffler kills performance ------------- 2007 Ski 2002 Ski |
Posted By: wetskier2000
Date Posted: December-09-2015 at 4:19pm
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I will check for rubbing and thickness, thanks... Curious that you mention this as I did find a CONSIDERABLE digger in the hull caused by abrasion from the rudder cable. I zip tied the cable up off the hull surface. ------------- Current: 1997 Nautique Previous: 1987 Nautique 1964 American Skier |
Posted By: JayG80
Date Posted: December-09-2015 at 4:35pm
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You'll probably be able to identify thin spots where the black has worn off and the muffler is yellow. I had a couple of rubber support pads that slipped out of position from under the muffler. Created additional neoprene pads from HO Animal Ski binding toe pieces (not the wraps). Then used Gorilla Glue to secure the new pads. There is probably a better glue and pad material but this worked fine for me using on-hand stock. ------------- 2007 Ski 2002 Ski |
Posted By: winniskier
Date Posted: December-10-2015 at 9:44am
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I have the same boat, same year, same soot, with no identifiable leaks in an exhaust system that was replaced south of the risers in the last five years. Resist the urge to over tighten the clamps as this can crush the fiberglass. My current conclusion is that the soot is actually composed of belt dust and engine fluids and the concerning noise from the exhaust is a figment of my imagination. The good part is that the soot on the rug and in the bilge cleans up very easily each spring.with soap and water. That said, if I could figure out how to stop the soot, I'd die a happy man. ------------- Jim |
Posted By: 8122pbrainard
Date Posted: December-10-2015 at 10:01am
As well as alignment. Get the straight edge out! ------------- /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 < |
winniskier wrote:Posted By: baitkiller
Date Posted: December-10-2015 at 10:24am
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One of you guys needs to take a trip to the scrap yard and figure out a serp setup for the Fords. It took me one afternoon to do the Chevy and when I think of all the crazy stuff I did to my boat, the serpentine belt is the biggest upgrade. I have not touched it in 300 plus hours except to replace a tensioner that was making noise when first installed. No squeals and zero dust. All the parts are available from Motorcraft for sure and probably not very much money. Just have to figure out which ones. Have to source a pulley for the Sherwood but that couldn't be that hard. I'm surprised one of our resident engineers hasn't done it yet. ------------- Jesus was a bare-footer............. |