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525efi water pressure port

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525efi water pressure port

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Old 02-11-2019, 08:20 PM
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Default 525efi water pressure port

not sure why but my boat does not have water pressure gauges and I want to add them. Can someone explain or even better send a pic of where I connect the fittings/ hose to a 525 efi. 2003 motor. Thanks for your help.
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Old 02-12-2019, 08:21 AM
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Remove one of your block drains and install a Tee. Put plug on one side and a compression fitting (1/8 NPT to 1/16 compression) on the outer to use air brake line up to the gauge. Some have installed it in the thermostat housing and I still need to remember to move mine from the block up there for pressure comparison for tractionless
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Old 02-12-2019, 09:40 AM
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Note: the above is for open cooling

If the motor is closed cooling, then need need a serial number to see what you have
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Old 02-12-2019, 10:25 AM
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On 700's (Fountain Lightning), there is a t-fitting on the oil cooler, on the back of the engine. The t feeds smartcraft and mechanical gauge. It's just a brass block. I might have a pic somewhere...
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Old 02-12-2019, 10:30 AM
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Here's a pic.
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Old 02-12-2019, 11:52 AM
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Nothing wrong with an water flow meter for an install. Some Marine oems are installing them instead of water pressure system / monitoring or both. Water pressure and or any pressure reading is a form a resistance. Sometimes it can fool one when monitoring.

Example a low water pressure reading can become a high water pressure reading when a line or orfice after the pressure reading becomes restricted.

Actually I like to have both readings -- water flow and water pressure
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Old 02-12-2019, 12:01 PM
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Thanks for all the help. It is closed cooling and s/n is OM905807.
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Old 02-12-2019, 12:25 PM
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Originally Posted by therealmccoy View Post
Thanks for all the help. It is closed cooling and s/n is OM905807.
Here is the Tee fitting which can be used on the oil cooler
https://www.boats.net/product/mercur...gaAo3eEALw_wcB

Might also find it at a hardware store
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