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Jan 23rd, 2013
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Increasing size of water pump discharge hole #12434930
09/21/17 02:35 AM
09/21/17 02:35 AM
Joined: Feb 2013
Posts: 1,202
S
SlabHappy Offline OP
Extreme Angler
SlabHappy  Offline OP
Extreme Angler
S

Joined: Feb 2013
Posts: 1,202
I have a 115 2cyc merc, 94 mod. I have had an issue of clogging up the fitting of wp discharge hole for the water pump. I took it off and got a 3/8 hose barb to some threaded fitting, and mounted on engine. This opened the discharge from about a 1/16 to about 1/4 or 5/16. I had a friend tell me that the cooling system requires this back pressure to cool properly. From my research, I have never found that, but I asked BPS parts, and he said he didn't suggest this. Does the cooling system require a back pressure, and would I have issues if I increased the diameter of discharge hole to about a 1/4"? I kept the fitting, so I can replace it. I also put a clear line on, so I can see if it is clogged.

Last edited by SlabHappy; 09/21/17 02:36 AM.
Re: Increasing size of water pump discharge hole [Re: SlabHappy] #12435026
09/21/17 04:06 AM
09/21/17 04:06 AM
Joined: Dec 2014
Posts: 1,664
Euless
M
Muzzlebrake Offline
Extreme Angler
Muzzlebrake  Offline
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Joined: Dec 2014
Posts: 1,664
Euless
I ain't no guru but I think your thermostat(s) and pop-it valve provide all the back pressure it needs. Once the water leaves the block via the thermostats opening it is free flow. Don't know that hole size would matter. When the t-stat is closed, no tell tale. T-stat opens, tell tale starts. That's the way you know it's warmed up enough to run wide open.


From Genesis: "And God promised men that good and obedient wives would be found in all corners of the earth."

Then He made the earth round...and He laughed and laughed and laughed!

Re: Increasing size of water pump discharge hole [Re: SlabHappy] #12442855
09/26/17 06:07 PM
09/26/17 06:07 PM
Joined: Nov 2006
Posts: 253
Flower Mound, Plano
B
Budlitego Offline
Angler
Budlitego  Offline
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Joined: Nov 2006
Posts: 253
Flower Mound, Plano
I have a 70 Johnson and I have done the same to mine. I haven't had any problems, the water comes out warm.

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