Maxum 2400 SCR in Croatia

[Ivan Horvat]

Thanks Mike and Phillbo

There's a new item on my wishlist

[Ivan Horvat]

I had a daily trip today, there are some photos

[Ivan Horvat]

Now about the sad.
I left the marina with a full tank of fuel and water, I was alone.
The estimated distance was 14.4 nautical miles.
The sea was claim and no wind.
My top speed was 31 mph (according to mobile app)
After that my cruise speed was 28 mph.

In the middle of the distance, the alarm went off and the boat lost speed, a second later the engine began to choke, I put it in neutral and turned off the engine.

After a couple of minutes, I started it again, the indicators were as follows, look at the photo

[Ivan Horvat]

In other words, all indicators were normal.
I made the decision to turn back and drove home at 9 mph, the engine was running smoothly, the speed was stable, but as soon as I tried to increase the speed, the engine choked.

And one more detail, the right (starboard) raiser was warm and the left (port) raiser was cold.

What is the problem? Where to look?

[mmwjr]

Originally Posted by Ivan Horvat

I had a daily trip today, there are some photos

Gorgeous.

[mmwjr]

First get yourself an IR temp sensor and take actual temperature readings of the thermostat housing, and both exhaust manifolds/risers. I prefer real data. Being a EFI engine you can read out the fault codes if you have a Ridna tool or buy the PC version that you can load onto a laptop along with the cable to plug into the test port. Otherwise pay a mechanic who has the tool to read out the codes. Several sensors and any one could be seeing a fault if not faulty itself.

[Ivan Horvat]

All data is in degrees Celsius.
Measurements were taken after 30 minutes of boating at 2500 rpm.

Port side:
manifold 55.6
raiser 39.6
block 80.6

Stb. side
manifold 65.2
raiser 55
block 69.2

Thermostat housing (see pic)

[mmwjr]

Those readings look good, were they taken sitting at the dock, underway or when the engine looses power? The later is preferred.

[Ivan Horvat]

They were taken underway.

[mmwjr]

Originally Posted by Ivan Horvat

They were taken underway.

Was the engine running normally or was it experiencing power loss at the time?

Best bet to get codes read from the ECM.

[Ivan Horvat]

I did not plan to spend $600 on a diagnostic tool, but it seems I have to do it.
I assume this one will be enough for me
https://www.rinda.com/rindashop/shop...acom-94105-kit

Answering to your Q Mike, the engine is not running normally, 3000 RPM is the maximum.

[mmwjr]

Yup, that one will do.

[Ivan Horvat]

New day - new trouble.
Yesterday I had a trip to the nearest island and one of the cooling tubes started leaking. The pipe was fixed with aluminum tape, there is no leak at idle, but there is a leak at speeds higher than minimum. I drove home at minimum speed and my boating season is over.

[mmwjr]

That’s the engine circulating pump hose, replace it. Higher rpm high water flow and pressure. Use your engine serial number to look up the part number so you can search for it locally.


https://www.marineengine.com/parts/m...iAAEgJRlfD_BwE

[Mr Hemi]

Replace your thermostat and gaskets, cheap and easy to help with possible heat issues.

Hoses are expensive so sorry for that, but way to important to not change out.

Check your belt on your engine, any cracks replace it.

Impellor change it out, if your doing hoses anyway.
These are cheap parts for thew most part, and will help troubleshooting overheating.

My 2500 SCR had temperatures like yours, and the boat ran much cooler once I changed out the impellor.
Good Luck.

[Ivan Horvat]

Thanks Mike and Mr. Hemi

[shrew]

The problem is your incident occurred when you were running at 28 mph. What was your RPM at that speed?

Your temps were taken at 2500 RPM, is that the RPM that gets you to 28 MPH?

[Mr Hemi]

Temperatures are not that bad, 185 is a bit high but would not cause for alarm.
My gauges were a lot better than yours, and they were out more than 10 degrees.
based on temp and oil; pressure I dont see a problem.

If temperature keeps climbing with RPM above 185 degrees, then I would be worried, but again I bet gauges are not very accurate.

Boating running good at low RPM but sputtering at high RPM makes me think fuel issue, or IAC if you have one.
For sure replace thermostat.
https://www.lakewizard.com/post/boat-beeping.
Good Luck.

[Mr Hemi]

Originally Posted by Phillbo

Bad trim limit sensors... replace them both.

Your trim limit switches are good.

When you use the trim up, it has a safety that makes sure you dont pull the drive out of the water when running.
So when you use the switch, it only comes up about 1/2 way on guage.
this is normal.

When you use the trailer switch, you are pulling the drive out of the water, so it allows motor to be pulled up completly.

If you even find your trim switches are not working correctly and your in a jam, just remember to use your trailer switch to lower or raise up.

[Mr Hemi]

if you need some replacement gauges let me know.
I am changing mine out soon.