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IN-OUT BOARD MERCRUISER WATER COMING OUT MANIFOLD

BOAT ENGINE WATER COMING FROM MANIFOLD

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2011 seadoo boat 150 speedster surging up and down on full throutle but idles fine in neutral and changed the plugs and new gas and tps sensor and still no differnce


Check for air leaks on the manifold, or fuel air locks, fuel starvation. Tank vent, kinked pipes, that sort of thing.

There is further help in the link.

This is caused by minor cavitation. It is not an actual issue. What is happening is that your impeller is moving fast enough that it's drawing out the available supply of water since the boat is moving slowly and there isn't enough pressure on the bottom of the boat the keep the jet pump fed with the amount of water you're expelling out the nozzle. Water is fed into the tunnel in the transom by the pressure caused by forward motion at speed.

Every jet boat will probably do it at a certain RPM depending on many different factors even down to water temperature, fresh/salt water etc.

For the longevity of your wear ring and impeller...avoid that rpm.

2011 seadoo boat 150 speedster surging up and down on full throutle Google...

Aug 14, 2017 | Cars & Trucks

1 Answer

Mercruiser boat 1989 3.7l/LX 4 cyl. 3&4 cyl is not firing. New plug . Contact Pt.wires, distributor cap.start right away,


Try to ensure you have the correct PT Wires connected in the right order of firing, This should be on the side of the engine near the top either side it can on, I am sure that is your problem. Best Wishes. Malcolm Campbell.

Jun 20, 2017 | Cars & Trucks

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HOW TO REMOVE A FLYWHEEL FROM 1985 MERCRUISER 190 ENGINE


Hi, I have a question, is it the mercruiser 190 marine engine that is based on the 350 chev engine

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1 Answer

My mercruiser 120 wont shift


You have this posted in car and truck category, please re-post in boats.

May 30, 2012 | Cars & Trucks

1 Answer

1990 454 mercruiser misfire under load when warmed up


Running on a stand is not the same as running under power...In the water, you are essentially running on a dynomometer (dyno is a big water brake) If you can prove that the module isn't putting in enough advance, it would be doing the same thing that I mentioned with the damper, only for a different reason. So...you're likely on the right track. (rather have a points setup out on the water...anything goes wrong, you fix it without a tow!!!!)
Good luck

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1 Answer

I have a 1987 mercruiser alpha one out drive the boat sat for 5or 6 years engine turns over but no spark also had water in the cylinders drained the oil filled the cylinders with mystery oil let it sit for...


Alpha One is the out drive, what engine do you have? Remove the distributor cap and verify if your ignition is electronic or contact points. Either way, I recommend going with a Pertronix electronic ignition. This module is a simple drop in installation and will eliminate a major portion of your troubleshooting. Pertronix also has a high output coil to accompany their ignition, I recommend you install both as a set.
FYI, water in the cylinders is not good. Especially if it sat for 5-6 years rusting the rings and cylinder walls. Was this boat running when it was parked and do you know the history?
Nick

Aug 01, 2009 | 1986 Chevrolet K1500

1 Answer

Chriscraft w/ Mercruiser I/O wont raise completely


there is an up and down button and then a seperate trailer button to raise it further. it uses the same system to continue to raise it so you may have an issue with the trailer button.

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3 Answers

Upgrade 4.3 l carb engine to vortec TFI fuel system


It can be done but it is very time consuming.
I use an 87 Astro van intake sensors and computer on my 86 OMC.
After six years I am still playing with it.
Runs good and easy on gas.
Got lots of info from DIY-EFI.
You HAVE to change programing in the computer.
I am running a closed loop system with one oxygen sensor in the starboard manifold.
Your 94 computer is not as good for a boat because it also controls the transmission.

Just to give you an idea what your in for.

Apr 01, 2009 | 1994 Chevrolet S-10

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