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07-24-2010, 10:02 PM #1
mercury 2.4l high water pressure after I installed water pump kit.
Hello everyone, I installed a water pump kit yesterday on my 1988 2.4l 220 (converted to carbs). I had around 5psi of pressure at idle(1000 rpm) and about 15-20 psi at full throttle (6000 rpm) before the new pump kit. I thought I would install a new pump kit, just for general maint. I now have 15+psi at idle on the hose.The water pressure gauge will drop to 12-15 psi when the poppet value dumps . When the pressure drops, at the same time a small amount of water squrits from the poppet value cover . The water is comming from what I think is a weep hole in the cover. I am not sure but I think water comming from the weep hole would indicate a leak in the poppet diaphragm or gasket. The thermostats are less than year old. The water comming from the pee hoses is not all that much. I can tell the thermostats are opening just not all the way?? I am still pretty new to outboards. I greatly appreciate any help. Thanks again.
Last edited by sasquitch; 07-24-2010 at 10:36 PM. Reason: more info.
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07-24-2010, 10:06 PM #2
High pressure means a restriction somewhere. Usually, water out the weep hole is a bad diaphram, but your so high, it may be too much for the diaphram to hold back.
Did the water tube pull out when you changed the pump?Living in the Freedom provided by Bud Conner and his fellow warriors.
R.I.P. my Heathen Brother
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07-24-2010, 10:12 PM #3
Yes, the tube did come out.
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07-24-2010, 10:38 PM #4
I just checked the scale on my pressure gauge. 15psi is as high as it goes. Sorry about the wrong info. It reads 15+ at idle and around 12-15 when the poppet dumps. Isn't this still a little high? Thanks.
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07-24-2010, 10:49 PM #5
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07-24-2010, 11:07 PM #6
Hey, I think so too. I am just not real clear on what the poppet does ? Will replacing the poppet lower the pressure? Is 15psi at idle with a new impeller too high? Thanks again.
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07-24-2010, 11:39 PM #7
15 lbs doesn't sound that bad for a new water pump with the thermostats closed. The poppet regulates water pressure in the block. It should hold more like 20 to 25 lbs. at full throttle.
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07-25-2010, 03:58 PM #8
Thanks US1, I think the water pressure is overcoming the weak poppet spring and dumping the water before it reaches a high enough temperature to fully open the thermostats. I will put a new poppet kit in tomorrow. Does my theory make any sense. Thanks again .
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07-25-2010, 06:13 PM #9
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07-25-2010, 08:10 PM #10
OK, I will install poppet kit tomorrow and post the results. Thanks for the help.
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07-25-2010, 09:35 PM #11
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07-26-2010, 08:43 PM #12
Hey , When I pulled the old impeller everything was there. I checked the reverse flow of water while I had the lower unit out.I also checked with air after the lower was installed. The water as well as the air drained from the block unrestricted . I talked with mercury tech/parts dealer that I buy parts from. He as well as US1 said 15psi with a new pump kit was not crazy high for my motor. I may be overreacting a bit, but when you go from 5psi at idle to 15psi. I thought I better be sure and ask some that knows. As usual scream and fly members help me out again. I do have a leak in the poppet diaphragm. I bought a poppet kit today, I will install it tomorrow and post results. Thanks again.
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07-27-2010, 08:13 PM #13
Hello, I installed poppet kit today. The old diaphragm was shot. I now have 12 -15 psi at idle. The thermostats are opening with good water flow. I have not tested in the lake. I will do that this weekend.Thanks for all the help.
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07-28-2010, 12:42 AM #14
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07-31-2010, 12:06 PM #15
Everything went well. Great water pressure from idle to wot. Thanks S & F.