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What is your water pressure? Late model stock Mercury 454 or 502

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Old 05-08-2002, 02:12 AM
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Exclamation What is your water pressure? Late model stock Mercury 454 or 502

I am looking to get water pressure numbers from anyone who has a 95 and up 454 or 502. What is the highest water pressure you have seen from your engine? I am interested in engines with the newer thermostat housings. The thermostat housing has one water inlet from the seawater pump. One exit to the circulating pump and two exits, one to each of the exhaust manifolds. Any input would greatly be appreciated.

Dan

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Old 05-08-2002, 10:32 AM
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Dan,
I don't have the stock setup as you know. My water pressure is around 10 psi cruising and 15 psi at WOT. I have no t-stat and use a water x-over so water goes in block,thru heads and out to exhaust.

There was a thread out here about 9 mos. ago and somebody made a dump valve or bypass because his water pressure was around 50 psi. He set it up to dump excess pressure thru a hull fitting. Try doing a search. I think the thread was started by someone with "fountain" in his screen name but don't quote me on that. If I think of anything else I'll let you know. What is your current water pressure? How are you getting your reading? Is it a mechanical or electric guage?

Take care,
Dave
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Old 05-08-2002, 11:29 AM
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Dave,
Gary Grimes makes a kit for the water dump. I have two being made up for me. My pressure is being taken off of the side of the block with a mechanical gauge.

The reason for this post is to find out if Mercury possibly has a problem with the late model 454's and 502's, not including the high performance engines. Most of the boats that use these engines don't have water pressure gauges. The owners don't know their might be a problem. The only thing that should point out a problem is leaking circulating pumps after only 50 hours.

I need all the input I can get on this question. I don't think a lot of the owners of these engines have water pressure gauges on them.

Thanks,
Dan
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