Maxum 2400 SCR in Croatia

[Ivan Horvat]

Originally Posted by 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?

When I running 28 mph my RPM was 4000-4200
2500 RPM = 12-14 mph

[Ivan Horvat]

Thanks Mr. Hemi

[Mr Hemi]

With top seed of 31 MPH your probably at the right RPM 4400-4500RPMRPM ish, so thats good.
Cruising at 4000-4200 RPM is to high though.
my 2500SC R likes 3400-3600 RPM and fuel burn will be much lower also.

Your fuel pressure and temperature seems great, looks like engine is running good.
Just need to find out why it shut down.
based on manifold temperatures, I would not think its to serious.
Just my thoughts, I know much more experienced people here whos opinions would help as well.
Cheers Grant

[Mr Hemi]

When you say the engine began to choke what do you mean???.

With full fuel and water and such a high cruise speed you were really sucking in the gas.
Maybe the issue is fuel starvation??
Bad gas.
Debrie in fuel tank.
Clogged fuel filter.
Water in gas or tank.
Have you dumped in Fuel treatment to help stabilize the gas and or get rid of moisture in tank???.
Hot days cool nights could cause condensation to build up in tank.
Just offering my opinion.

[Mr Hemi]

Ez-Flo 30031 is a 4.5 inch DRAIN FOR THE SHOWER THAT SHOULD WORK.

[Ivan Horvat]

I will try to explain.
Before the breakdown, the engine rpms was above 4300.
Now, at full throttle, it’s impossible to reach rpms above 3000.

I bought a new pipe, a new thermostat and a set of gaskets.
I'll replace all the parts on Saturday.
I would like to note that Croatia is a maritime country, but many spare parts for the Mercruiser are not available. Ordered from Austria.
I will order all other pipes from the USA, cheaper than in the EU.

The old thermostat was disassembled in parts, I think no one has ever replaced it.

[mmwjr]

Hard to imagine that replacing these parts will restore the lost rpms.

[Mr Hemi]

Originally Posted by mmwjr

Hard to imagine that replacing these parts will restore the lost rpms.

Your probably right.
But changing out a $20:00 dollar thermostat seems like a good place to start.

I had been trouble shooting temperature issues, and a thermostat and impellor seemed like a good place to start.
The impellor was the culprit, and if he doesnt know when it was done it should be replaced.

I know these things are not likely going to solve his problems, but they will eliminate future ones and the cost is minimal.
I am new to boating also, but i do all my own work, and have solved all my problems. (With the help of the members here).

[mmwjr]

Originally Posted by Mr Hemi

Your probably right.
But changing out a $20:00 dollar thermostat seems like a good place to start.

I had been trouble shooting temperature issues, and a thermostat and impellor seemed like a good place to start.
The impellor was the culprit, and if he doesnt know when it was done it should be replaced.

I know these things are not likely going to solve his problems, but they will eliminate future ones and the cost is minimal.
I am new to boating also, but i do all my own work, and have solved all my problems. (With the help of the members here).

I was referring to his engine being limited to 3000 rpm. He’s has several issues.

[Mr Hemi]

https://www.google.com/search?q=alar...t=gws-wiz-serp. I would read through these and start from there.
I still think it is fuel or temperature/ thermostat. Compression test might be in order after a hard run like he did fully loaded, maybe knock sensor causing issue???

[Mr Hemi]

Originally Posted by mmwjr

I was referring to his engine being limited to 3000 rpm. He’s has several issues.

Anti Syphon valve.
Sorry dont know much about it, but from reading it can cause similar symptoms.
Any thoughts???

[Ivan Horvat]

I know that this small repair will not solve all the problems. But this is a good start.
To be confident in the engine I need to change a lot of things.

[Mr Hemi]

I sent you a Privat message not sure if you got it.

I am replacing my gauges, if you want the o0ld ones just pay the shipping.
They are in better condition than yours.

The Speedoo and temperature were not accurate, so i bought new ones, which I will include with the other gauges.

So 5 inch speedoo @ Tach.
2 inch trim, 2 inch temp, 2 inch oil pressure, 2 inch fuel.
They are original gauges and they work great, except tac sticks sometimes when dropping.
I will pull the rest of the gauges next week, let me know if your interested, otherwise I am not sure what I will do with them.

[Mr Hemi]

This is the correct drain for your shower.
It is the exact measurements from the original one.
I tried it and it fits perfectly.
The center comes out for easy cleaning.
https://www.amazon.com/Danco-10644-M...6XXMZQRT&psc=1.

[mmwjr]

Originally Posted by Mr Hemi

Anti Syphon valve.
Sorry dont know much about it, but from reading it can cause similar symptoms.
Any thoughts???

It’s a simple check valve to prevent fuel from being sucked back into the tank when the engine is off. A stuck one can limit fuel flow starving the engine.

[Ivan Horvat]

Originally Posted by Mr Hemi

I sent you a Privat message not sure if you got it.

I am replacing my gauges, if you want the o0ld ones just pay the shipping.
They are in better condition than yours.

Thanks Grant.

I did not received a PM from you. I appreciate for gauges, if you really do not need them I will grab them. See PM with my postal address.

[Ivan Horvat]

Originally Posted by Mr Hemi

This is the correct drain for your shower.
It is the exact measurements from the original one.
I tried it and it fits perfectly.
The center comes out for easy cleaning.
https://www.amazon.com/Danco-10644-M...6XXMZQRT&psc=1.

I will try to find this item in EU market.

[Mr Hemi]

Originally Posted by Ivan Horvat

I will try to find this item in EU market.

I can send it to you with the gauges.

[Mr Hemi]

You are likely limited to 3000 rpm because you still have a fault code. Until it's cleared you are probably limited to 3000 rpm in drive or neutral. If you don't have money to read engine fault codes,ask a mechanic to look at them or borrow from. Another boat owner. It's a popular motor. When you get the fault codes, then people here will be able to help. The Hull Truth is Another really good site for help,and have a great used parts forum. Good Luck. It's fuel,oil or temperature, should not be to expensive to fix.

[Mr Hemi]

https://www.marineengine.com/boat-fo...ms-fyi.476835/.
Worth looking at.