Go Back  Offshoreonly.com > Technical > General Q & A
496 HO starboard exhaust burning hole >

496 HO starboard exhaust burning hole

Like Tree3Likes
  • 1 Post By BillK
  • 2 Post By IGetWet

496 HO starboard exhaust burning hole

Reply

Old 05-22-2019, 11:26 AM
  #1
Registered
Thread Starter
 
Join Date: Oct 2015
Location: Michigan
My Boat: 2001 fountain fever
Posts: 7
Default 496 HO starboard exhaust burning hole

i have a 496 HO in a fountain fever 29. I continually burn a hole at the top of my wet exhaust on the starboard side. i have read previous forum article on here about this issue and have tried everything.
I have replaced impeller, replaced ball valve, changed starboard rise with port riser, grinder top of bellow down.

It still appears and feels to me that the exhaust hose is is touching the top of the bellow. could i be running the wrong type of wet exhaust hose. is there a flex wet hose that i can run. I have an angle (down) from where my exhaust tip is to angle of my riser. i feel like my exhaust hose (brand new) doesn't bend at all so i continually hits the top of the hose.

Could the motor be out of alignment. i am at a lost of what else to do. any help or recommendation would help.

Derrick
d4laseck is offline  
Reply With Quote
Old 05-22-2019, 11:55 AM
  #2
Registered
 
Join Date: Sep 2013
Location: Wisconsin
My Boat: 2005 25 Outlaw, Whippled Merc 525, Imco SCX-4
Posts: 1,012
Default

When you say exhaust hose touching top of bellow, what bellow are you referring too?

Sounds like your hose might be at too steep of an angle and the hot exhaust is blowing at that spot of the hose rather than down the hose.
IGetWet is offline  
Reply With Quote
Old 05-22-2019, 02:58 PM
  #3
Registered
 
Join Date: Oct 2005
Location: Waldorf, Md
Posts: 594
Default

Picture ?
SB likes this.
BillK is offline  
Reply With Quote
Old 05-23-2019, 11:18 AM
  #4
Platinum Member
Platinum Member
 
Join Date: Jun 2004
Location: Md
My Boat: 92, Checkmate, Enforcer 230
Posts: 320
Default

I burned a few holes in the top side of my 496 exhaust hose before I realized the down angle was the problem. It caused the inside of the hose to contact the flare at the top of the riser output creating a U-shaped water shadow and hot spot on the hose. I bent the top of the flare down ever so slightly to allow water to pass by and it's been problem free ever since.

Last edited by NightHawk; 05-23-2019 at 11:25 AM.
NightHawk is offline  
Reply With Quote
Old 05-23-2019, 11:40 AM
  #5
SB
Registered
iTrader: (1)
 
Join Date: Nov 2004
Location: On A Dirt Floor
Posts: 9,769
Default

Originally Posted by NightHawk View Post
I burned a few holes in the top side of my 496 exhaust hose before I realized the down angle was the problem. It caused the inside of the hose to contact the flare at the top of the riser output creating a U-shaped water shadow and hot spot on the hose. I bent the top of the flare down ever so slightly to allow water to pass by and it's been problem free ever since.
Exact same issue and repair on a set of short EMI's. The bell flare barely touched at top side and burnt thru hoses here and there. Reduced edge of bell flare a little to let water thru and wallah. Good for dozen years or so and still going.

The bell is very similar.



Last edited by SB; 05-23-2019 at 11:46 AM.
SB is offline  
Reply With Quote
Old 05-23-2019, 03:57 PM
  #6
Registered
 
Join Date: Apr 2005
Posts: 35
Default

Originally Posted by NightHawk View Post
I burned a few holes in the top side of my 496 exhaust hose before I realized the down angle was the problem. It caused the inside of the hose to contact the flare at the top of the riser output creating a U-shaped water shadow and hot spot on the hose. I bent the top of the flare down ever so slightly to allow water to pass by and it's been problem free ever since.
I did exactly the same thing with the same result, it was a easy fix.
SCANDINAVIAN is offline  
Reply With Quote
Old 05-23-2019, 05:27 PM
  #7
BUP
Registered
iTrader: (8)
 
Join Date: Jul 2011
Location: Ft. Worth TX
Posts: 8,776
Default

its in the service manuals how to install the exhaust and the angle to make sure water flow does not back up
BUP is offline  
Reply With Quote
Old 05-23-2019, 05:28 PM
  #8
Registered
 
Join Date: Sep 2013
Location: Wisconsin
My Boat: 2005 25 Outlaw, Whippled Merc 525, Imco SCX-4
Posts: 1,012
Default

When I moved my 496 up 3” I tried to get away with making the offset up with hose but after almost burning a hole thru said screw the hose and replaced with some home made tail pipes. Think I still have them actually.


SCANDINAVIAN and Ryan00TJ like this.
IGetWet is offline  
Reply With Quote

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


OSO Sponsor
OSO Advertiser
OSO Advertiser
OSO Advertiser