Outboard psi gauge

[Mavric]

Ive fitted a psi gauge to my mariner 60hp 3 cylinder outboard but i get no reading on the gauge its a faria 30 psi gauge , its brand new old stock never been used , its connected to the place marked with an arrow , any help to sort my problem please

 

[Mavric]

Any help please

 

[caiman]

The pressure of' what' are you trying to measure ? I don't mind being corrected,but I think that the brass plug you indicate ,is into the raw water system?
Cheers

 

[Mavric]

The pressure of' what' are you trying to measure ? I don't mind being corrected,but I think that the brass plug you indicate ,is into the raw water system?
Cheers

My outboard , is that the wrong place to connect the tube from the water pressure gauge if not where should it go , if it is why dosent it read anything ?

 

[Mavric]

Thats what i took out to connect the fixing that came with the gauge

 

[QBhoy]

It will read very very little, if you are expecting pressure when it’s on the trailer and at idle. There is next to no back pressure at all, in this state

 

[vas]

If I got that right and you are indeed trying to measure seawater pressure within the engine, I've fitted accurate pressure senders on both my main engines and the generator.
All feature heat exchangers so not raw water cooled.
Anyway, main IVECOs 6cyl turbodiesels register circa 0.3bar at idle, goes up to 0.6=0.7 iirc at WOT
generetor 2cyl NA yanmar at operating 3k rpm registers 0.5bar.
These values are with clean heat exchangers new impellers and waterlock on the yanmar, although with 3 seasons running, values have not changed.
Agree with QBhoy, don't expect much at idle on mufflers.

 

[Mavric]

So is it connected to the right place on my outboard ? and how will i test it without putting it on the water ?

 

[gordmac]

I can't imagine there is a lot of resistance to the water flow through an outboard, particularly at low speed. Why are you wanting to measure it?

 

[Mavric]

I like the lots of gauges , have i connected it to the right place as per my photo ?

 

[gordmac]

No idea about where you have connected it to but if all you want is another guage rather than specific information, does it matter?
Presumably it doesn't say anything in the outboard manual. You may be better asking on a fishing forum, they tend to use outboards.

 

[QBhoy]

So when the boat is on the trailer and at idle…good to be aware that the cooking water literally just flows out the exhaust full bore with next to zero resistance or back pressure. You’ll never really know until you have it on the water and under way.
I have a water pressure read out on two of my engines. They both show minimal tiny values when out the water. Even in the water at idle…very little.

 

[VicS]

I like the lots of gauges , have i connected it to the right place as per my photo ?

I think you have connected it to the right place but are you sure a 30 psi gauge is correct for your engine .

Take it for a run at WOT and see what reading yo get then,

If no joy post your question and pic together with full motor ID on the Mariner board at iBoats and/or Marine Engine forums. Thet will know

 

[vas]

tbh I recon a 10psi gauge would be plenty (in the water of course!)

 

[gordmac]

A pump produces flow not pressure, the pressure comes from the resistance to the flow. I can't see there being much resistance in an outboard.

 

[QBhoy]

You’ll likely know already…but I don’t think you’ll really need a gauge. Nice to have. But unless it’s on a high performance set up that has the boat aired out at over 60/70 mph…and at risk of losing water pick up…as long as you have a tell tale…you’re good.

 

[Mavric]

So when the boat is on the trailer and at idle…good to be aware that the cooking water literally just flows out the exhaust full bore with next to zero resistance or back pressure. You’ll never really know until you have it on the water and under way.
I have a water pressure read out on two of my engines. They both show minimal tiny values when out the water. Even in the water at idle…very little.

?

 

[Farmer Piles]

I'm with the others. You are trying to fix a problem that doesn't exist in a way that won't work. Not meant to sound hyper-critical, just airing my thoughts. The tell-tail will tell you all you need, put your hand in the flow to feel that it is just warm - job done.
I like simple - being a farmer and all that!

 

[QBhoy]

So here is my Mercury outboard water pressure at idle. Shows 0.23-0.26bar of pressure when in the water (deeply submerged on a low transom). That’s about 3.3/3.4 psi I think. If she was out the water then there is less than that for sure.