transom water pick up installation
#11
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Thanks for the info. I am leaning towards the Hardin marine 410-BK-1084 adjustable transom pick up.
When the install is done is it ok to block off the water hose from the drive, or will this result in drive overheating? Can I install a tee and pull water through both the transom pickup and the drive?
Also, in related links, I have read that excessive water pressure may be a problem at high speeds and that a "dump valve" should be installed ahead of the seawater pump. Is this accurate?
Thanks
When the install is done is it ok to block off the water hose from the drive, or will this result in drive overheating? Can I install a tee and pull water through both the transom pickup and the drive?
Also, in related links, I have read that excessive water pressure may be a problem at high speeds and that a "dump valve" should be installed ahead of the seawater pump. Is this accurate?
Thanks
Last edited by Rage; 10-15-2009 at 10:20 PM.
#12
Chris
Gold Member
The 496HO with closed cooling and the Bravo X1 drive with the gear case low water pickup system is spec'd up to 50 psi water pressure. You should have no problems of excess water pressure with a transum water pick up. It is the folks that use direct sea water cooling that really need a dump valve to protect the engine cooling system from excess water pressure....ie above about 30 psi max. The real area to be carefull with is to get enough cooling water esprcially with a stepped hull aerating the water.
Rage is also correct in that proper pickup location is crucial as to not get aireated water due to steps in the hull.
Chris
Last edited by CB-BLR; 10-16-2009 at 10:31 PM.
#13
I second Chris' input. No regulator. With the seawater circuit, the higher the volume the more it cools and won't logically rupture the tube used. The most important is placing the pickup to not get air in the circuit. That really reduces the system's cooling efficiency.
Russ
Russ
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#14
Registered
If you decide to go with the external pickups, the way you keep the water going through the drives is to drill and tap the upper case of the drive and put a pipe fitting in. You should also re tap and put a pipe plug in the helmet part of the gimbal as well as plug the transom water inlet. Here is a photo of mine. I would not use anodized aluminum fittings in salt water as mine in freshwater corrode very fast.
#17
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#18
Banned
With that said the dealer here did exactly what was needed as it sounds like. . I just hate when boaters think that they got ripped off by true marine dealers in the industry. Yes some do get ripped off and many do not. And for the record book times are not in the dealer favor either . Just saying and wanted to bring this up form a 11 year post.
Last edited by BUP; 01-25-2020 at 12:49 PM.
#19
Banned
I have a 2005 baja275 with a 496ho / bravo x drive (closed cooling). A year and a half ago boat spent 6 months in shop due to overheating condition. It was eventually determined to be a blockage due to corroded inserts at the transom assembly water hose- $2500 repair to pull drive and motor, replace transom ass'y. Merc warranty covered repairs. Apparantly this is a common problem. I am developing the same problem again and would like to bypass the drive plumbing by installing an adjustable transom water pickup. Is this a reasonable approach, or am I asking for trouble? It seems this can cause issues with excessive water pressure. Any advice would be appreciated!
Says Merc warranty covered repairs just bringing this up that's all
#20
Charter Member # 55
Charter Member
I had that set up on my Pantera. I would still run a hose from the inner transom water port to a hull dump. There could be too much water pressure at speed with just the drive shower.