Go Back  Offshoreonly.com > Technical > General Q & A
HP500 white smoke from exhaust >

HP500 white smoke from exhaust

Notices

HP500 white smoke from exhaust

Old 06-07-2019, 02:25 PM
  #1  
Registered
Thread Starter
 
Join Date: Jul 2014
Posts: 41
Likes: 0
Received 0 Likes on 0 Posts
Default HP500 white smoke from exhaust

I started up my Merc HP500 (carb) today after rebuilding it this winther. I get white smoke from one the exhaust (GIL with long wet risers). When I losen the risers on both sides they are wet on the inside and you can also se watermarks in the exhuast manifolds. I have cloosed cooling and I think the water in the exhaust taste glycol. Any idé what I have done wrong and what I should try? Can the intake manifold gaskets have a bad seal so water gets to the intake runners?
McNick is offline  
Old 06-07-2019, 04:07 PM
  #2  
Registered
 
Join Date: Feb 2001
Location: Elizabethtown KY USA
Posts: 436
Likes: 0
Received 0 Likes on 0 Posts
Default

First ingesting-tasting antifreeze is not a good thing for you.

Second, yes the intake gaskets would be a good start as to chasing down your problem.
GETTINBYE is offline  
Old 06-08-2019, 12:28 AM
  #3  
Charter Member # 55
Charter Member
 
Griff's Avatar
 
Join Date: Oct 2000
Location: Omaha
Posts: 17,492
Received 43 Likes on 28 Posts
Default

Has your coolant level dropped??
Griff is offline  
Old 06-08-2019, 04:54 PM
  #4  
Registered
Thread Starter
 
Join Date: Jul 2014
Posts: 41
Likes: 0
Received 0 Likes on 0 Posts
Default Youtoube

I uploaded a video on youtube, can it be reversion? The risers are wet all the way to the exhaust manifold are it’s som wet in it also.
McNick is offline  
Old 06-10-2019, 11:27 AM
  #5  
Registered
iTrader: (1)
 
Join Date: Jul 2012
Location: Fort Worth TX
Posts: 169
Likes: 0
Received 0 Likes on 0 Posts
Default

I'd suggest angling the rear of the motor down it could be reverting through the exhaust with it level. Also sounds like it idles too low those motors need to be 750 rpm or more at idle to prevent reversion. If it's anti freeze from closed cooling then I'd start with the intake and if that's not it, I'd leak down test from possible head gasket.
Donzi1979 is offline  

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

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service - Do Not Sell My Personal Information

Copyright © 2018 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.

OSO Advertiser