Go Back  Offshoreonly.com > General Discussion > General Boating Discussion
Water pump or no water pump? >

Water pump or no water pump?

Notices

Water pump or no water pump?

Old 02-24-2017, 10:58 PM
  #1  
Registered
Thread Starter
 
Join Date: Oct 2007
Location: Rolla/LOTO MO
Posts: 1,264
Likes: 0
Received 0 Likes on 0 Posts
Default Water pump or no water pump?

1996 merc 5.7 mag gen + motors. 300hp

Question: I had a place umplug the motors while I send them off to the builder. The place that is putting them back in is wanting to get rid of the water pumps on the front of the motors. He says there not needed because the sea pump will do it and it will take less stress of the motors not having to turn the pulleys. The oil temp runs hot so I'm adding oil coolers. Water temp was never a problem. He showed me a kit that you can put on to eliminate the pumps and showed me BB blower motors sitting in his shop that had this kit with no pumps. Should I or should I not?
nova26 is offline  
Old 02-25-2017, 12:32 AM
  #2  
Charter Member # 55
Charter Member
 
Griff's Avatar
 
Join Date: Oct 2000
Location: Omaha/LOTO
Posts: 19,518
Received 1,784 Likes on 885 Posts
Default

For what you have, I would say NOT and keep the engine water circ pumps. They will provide more consistent water temps and pressures.

Crossovers systems can cause problems with high water pressure.
Griff is offline  
Old 02-25-2017, 07:02 AM
  #3  
SB
Registered
iTrader: (1)
 
Join Date: Nov 2004
Location: On A Dirt Floor
Posts: 13,520
Received 3,091 Likes on 1,393 Posts
Default

KISS.

Keep the recirc pumps.

Less stress ? LOL.

Last edited by SB; 02-25-2017 at 07:04 AM.
SB is offline  
Old 02-25-2017, 01:06 PM
  #4  
BUP
Banned
iTrader: (9)
 
Join Date: Jul 2011
Location: Ft. Worth TX
Posts: 9,594
Likes: 0
Received 41 Likes on 35 Posts
Default

So do you have an alpha or Bravo outdrive ? If alpha then 100 % you need water circ pumps. If bravo many run without / cross over and many run the circ pump. I like using and running the circ pumps.
BUP is offline  
Old 02-25-2017, 01:11 PM
  #5  
SB
Registered
iTrader: (1)
 
Join Date: Nov 2004
Location: On A Dirt Floor
Posts: 13,520
Received 3,091 Likes on 1,393 Posts
Default

I believe he's got factory EFI also...all the more reason for factory recirc set-up.
SB is offline  
Old 02-25-2017, 01:21 PM
  #6  
BUP
Banned
iTrader: (9)
 
Join Date: Jul 2011
Location: Ft. Worth TX
Posts: 9,594
Likes: 0
Received 41 Likes on 35 Posts
Default

^^^^ That would be 100 percent correct SB. Over cooling or under cooling the engine - the coolant temp sensor inputs to the ecm will be out spec per stock OEM cal and that also will change Idle control. Also Idle control is important for shifting the outdrive - N to FWD ---- N to REV and so forth, plus important for no wake zones, docking, loading the boat on the trailer and so on. Even correct Idle control is important for engine shutdown in the water so the engine does not diesel and reverts water.
BUP is offline  
Old 02-25-2017, 02:48 PM
  #7  
Registered
Thread Starter
 
Join Date: Oct 2007
Location: Rolla/LOTO MO
Posts: 1,264
Likes: 0
Received 0 Likes on 0 Posts
Default

Originally Posted by BUP
So do you have an alpha or Bravo outdrive ? If alpha then 100 % you need water circ pumps. If bravo many run without / cross over and many run the circ pump. I like using and running the circ pumps.
Blackhawks 1:65 31p

I didn't like the idea of removing them that's why I thought I would research here. ��
nova26 is offline  
Old 02-25-2017, 03:21 PM
  #8  
BUP
Banned
iTrader: (9)
 
Join Date: Jul 2011
Location: Ft. Worth TX
Posts: 9,594
Likes: 0
Received 41 Likes on 35 Posts
Default

Blackhawk for your app - those recommend a idle of 600 rpms only . ^^^^^
BUP is offline  
Old 03-02-2017, 09:51 AM
  #9  
Registered
 
Join Date: Jul 2015
Location: Atlantic Southeast
Posts: 1,139
Received 76 Likes on 54 Posts
Default

Originally Posted by nova26
Blackhawks 1:65 31p

I didn't like the idea of removing them that's why I thought I would research here. ��
Good hunch, sounds like the shop is trying to make extra profit with no real benefit to you.
Tractionless 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.