Have an 07 31pc with 496mags and bravo threes. Have had recent overheating/sea water pressure issues. Replaced both raw water pumps due to scoring inside pumps. Inspected heat exchangers, hoses, drive intakes, etc. Pretty sure there is marine growth in the small hoses that go through transom. Have decided to bypass legs and install new intakes, thru hulls, seacocks, and strainers. Wondering if anyone else has done this? Any issues? Mostly concerned about placement of thru hulls and clean water intake due to top speed of forty knots. Any help is appreciated.
Bypassing outdrives with thru hulls and sea strainers
- Thread starter JayW
- Start date
Unforgettable
New member
I have the same boat but with 5.7 (320 HP) Volvo's. I put thru-hull fittings/strainers in after my first 3 seasons of overheating almost every time that I took the boat out. Have not had a problem since.
FYI, I used low-profile strainers manufactured by Buck Algonquin (ordered through Deep Blue Yacht Supply @ www.deepwateryachtsupply.com). The cost of the strainers/fittings totaled $739.98 back in 2009 and it cost $200.00 per engine to have them installed.
The Part Number of the Strainers was 00IWS150 (IWS-150 INTAKE WATER STRAINER)
Best $$$$ that I have spent to date.....
FYI, I used low-profile strainers manufactured by Buck Algonquin (ordered through Deep Blue Yacht Supply @ www.deepwateryachtsupply.com). The cost of the strainers/fittings totaled $739.98 back in 2009 and it cost $200.00 per engine to have them installed.
The Part Number of the Strainers was 00IWS150 (IWS-150 INTAKE WATER STRAINER)
Best $$$$ that I have spent to date.....
Unforgettable
New member
Yes sir. It only took 4-hours.....
Not sure of the Merc set-up but I wouldn't think that it should take much longer IMHO
Not sure of the Merc set-up but I wouldn't think that it should take much longer IMHO
Good morning,
Yes, that's a pretty popular modification around the Great South Bay on the South shore of Long Island due to the large amount of floating eel grass and shallow silty/muddy water.
So popular in fact that they are called "south bay sea strainers". Google them.
My friend has added them to his 31PC w/ 496s and solved his overheating problems due to sucking up silt/mud in his shallow canal. He has hull strainers on the bottom of hull and raw water inline strainers bolted to the stringers.
I have a 31PC w/ 6.2s and have been lucky so far but will install them if I find the need too.
Good luck.
Also see the post and picture posted by Clueless in this post:
http://formulaboatsforum.com/forumtest/index.php?topic=5421.0
Yes, that's a pretty popular modification around the Great South Bay on the South shore of Long Island due to the large amount of floating eel grass and shallow silty/muddy water.
So popular in fact that they are called "south bay sea strainers". Google them.
My friend has added them to his 31PC w/ 496s and solved his overheating problems due to sucking up silt/mud in his shallow canal. He has hull strainers on the bottom of hull and raw water inline strainers bolted to the stringers.
I have a 31PC w/ 6.2s and have been lucky so far but will install them if I find the need too.
Good luck.
Also see the post and picture posted by Clueless in this post:
http://formulaboatsforum.com/forumtest/index.php?topic=5421.0
undercover
Member
our '04 31pc has Gil strainers, I believe from the factory. They do not bypass the water intake on the drives but rather are an additional intake. I heard it's a good idea to keep the drive intake when installing thru hull pickups as the water flowing through the drives keeps the drive lube temps down.
Installing the blockoff plates on the transom shields would be a lot of labor as they're pretty burried back there.
Installing the blockoff plates on the transom shields would be a lot of labor as they're pretty burried back there.