Notices

High hour 575 sci's

Old 06-14-2017, 10:51 PM
  #1  
Registered
Thread Starter
 
Join Date: Jan 2011
Location: Navarre, Fl
Posts: 217
Received 0 Likes on 0 Posts
Default High hour 575 sci's

Got a buddy lookin at a boat with high hour mercury 575s as far as I know stock. Havnt got service records yet but they have 500 hrs. How are their lifespans.
Riley0114 is offline  
Old 06-15-2017, 01:28 AM
  #2  
Charter Member # 55
Charter Member
 
Griff's Avatar
 
Join Date: Oct 2000
Location: Omaha/LOTO
Posts: 19,475
Received 1,736 Likes on 857 Posts
Default

With 500 hrs and if never opened up, it will be time for top ends at a minimum.
Griff is offline  
Old 06-15-2017, 07:15 AM
  #3  
VIP Member
VIP Member
iTrader: (1)
 
Quinlan's Avatar
 
Join Date: Jul 2003
Location: Tulsa, GLOC
Posts: 4,065
Received 552 Likes on 258 Posts
Default

Surly they have been opened! I haven't heard of many making it past 200 hours without blowing the head gaskets lol.
Quinlan is offline  
Old 06-15-2017, 08:29 AM
  #4  
Registered
iTrader: (1)
 
Join Date: Jun 2011
Location: Henderson, KY
Posts: 2,167
Received 80 Likes on 56 Posts
Default

right

Originally Posted by Quinlan
Surly they have been opened! I haven't heard of many making it past 200 hours without blowing the head gaskets lol.
ALL_IN! is offline  
Old 06-15-2017, 08:31 AM
  #5  
Registered
iTrader: (1)
 
Join Date: Jul 2007
Location: MI
Posts: 2,639
Received 12 Likes on 6 Posts
Default

What Quinlan said. If they have not been opened that is one high hour set of 575s. A few things about 575s, stock mapping sucks, fuel injectors are obsolete, low pressure lift pumps leak and take out sea pump bearings, flat tappet cams have been known to lose lobes, intakes rot out in salt water, blowers are not the most durable.

Unless it is a screamin deal on the boat (leaving enough $ for rebuilds) this would be one I would pass on.
JRider is offline  
Old 06-15-2017, 08:51 AM
  #6  
Registered
Thread Starter
 
Join Date: Jan 2011
Location: Navarre, Fl
Posts: 217
Received 0 Likes on 0 Posts
Default

Appreciate the input guys! I'll get some more details on them if they've had any work done. If not we will definitely move on. We were lookin mostly at 496 and 525 boats I just didn't know much about the 575s longevity I knew that had to be high
Riley0114 is offline  
Old 06-15-2017, 11:16 AM
  #7  
Registered
iTrader: (1)
 
Join Date: Jun 2011
Location: Henderson, KY
Posts: 2,167
Received 80 Likes on 56 Posts
Default

...and rockers and springs - ask me how I know. They are a good foundation for upping the HP though - I liked mine, but the fuel tanks on the 35' Lightning weren't big enough! LOL

I do have a good 575 fresh water intake for sale though!

Originally Posted by JRider
What Quinlan said. If they have not been opened that is one high hour set of 575s. A few things about 575s, stock mapping sucks, fuel injectors are obsolete, low pressure lift pumps leak and take out sea pump bearings, flat tappet cams have been known to lose lobes, intakes rot out in salt water, blowers are not the most durable.

Unless it is a screamin deal on the boat (leaving enough $ for rebuilds) this would be one I would pass on.
ALL_IN! is offline  
Old 06-16-2017, 07:08 AM
  #8  
VIP Member
VIP Member
iTrader: (1)
 
Quinlan's Avatar
 
Join Date: Jul 2003
Location: Tulsa, GLOC
Posts: 4,065
Received 552 Likes on 258 Posts
Default

I am in the middle of my 2nd rebuild. This time I caught it BEFORE it blowed up lol.

The first time Brad rebuilt, he punched mine out to 509s, aluminum heads, full roller, upgraded fuel system and several other new/ upgrades. Was pushing 750 hp. Now we just replaced the blowers w TBS swaps. That's when we found the current issues- luckily before I went and turned those new blowers ON!
Have been very happy.
they do like Fuel !!
Quinlan is offline  
Old 06-19-2017, 02:04 PM
  #9  
Platinum Member
Platinum Member
 
Tom A.'s Avatar
 
Join Date: Nov 2002
Location: New Jersey
Posts: 4,288
Received 84 Likes on 31 Posts
Default

As an experienced 575 boat owner, at 500 hours, the top end has been gone through at least once.
At 500 hours, you will need to at least do a good once over on the entire engines. Chances are the bottom end will need at least rings, the top end will need a complete go through and I would recommend making it a roller cam if it is not already. That will extend the life and let you gain some hp if you want. The blowers will need to be rebuilt and carefully check the intake manifolds as those have been a problem point for corrosion. Pressure test the headers as well.

Ron Potter built mine up to 700hp roller motors and they run like a champ!
Tom A. 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


Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

Copyright © 2024 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.