OIL OVERFILL

[Pruis6]

So I changed my oil today in the boat for the first time (usually done at the dealer). It went fairly smooth all the while learning a few lessons. I've ran the boat and checked the fluid after running it. It needed a little extra. It looked like it needed about 2 quarts so I added one then checked again. Now it is above the fill line..

Is this a big deal? Am I going to blow seals or something terrible if I don't drain some oil??

[Bill_AirJunky]

I'm not sure what would happen. But considering the mess a blown seal would make, I think I'd drain a little.

[nuttyskier2002]

So I changed my oil today in the boat for the first time (usually done at the dealer). It went fairly smooth all the while learning a few lessons. I've ran the boat and checked the fluid after running it. It needed a little extra. It looked like it needed about 2 quarts so I added one then checked again. Now it is above the fill line..

Is this a big deal? Am I going to blow seals or something terrible if I don't drain some oil??

You will not blow any seals. How much over is it? Every time I change my oil, when I put the required amount in (as per owner's manual) it is over. Over by about 1/2 the distance between the add and full marks. Overfilling too much will cause the oil to get aerated by the spinning crankshaft. If this isn't happening,... you are fine.

[Pruis6]

So I changed my oil today in the boat for the first time (usually done at the dealer). It went fairly smooth all the while learning a few lessons. I've ran the boat and checked the fluid after running it. It needed a little extra. It looked like it needed about 2 quarts so I added one then checked again. Now it is above the fill line..

Is this a big deal? Am I going to blow seals or something terrible if I don't drain some oil??

You will not blow any seals. How much over is it? Every time I change my oil, when I put the required amount in (as per owner's manual) it is over. Over by about 1/2 the distance between the add and full marks. Overfilling too much will cause the oil to get aerated by the spinning crankshaft. If this isn't happening,... you are fine.

Does 5-1/2 quarts sound about right for a 340 Monsoon?

[Pistol Pete]

Does 5-1/2 quarts sound about right for a 340 Monsoon?

Yup,

I just did mine the other day and it used to take only 5 qts. After boating all weekend I actually bothered to check the level and it was a little over, probably just like yours. I'm not gonna worry about it. It'll need that extra oil by mid season.

[nuttyskier2002]

So I changed my oil today in the boat for the first time (usually done at the dealer). It went fairly smooth all the while learning a few lessons. I've ran the boat and checked the fluid after running it. It needed a little extra. It looked like it needed about 2 quarts so I added one then checked again. Now it is above the fill line..

Is this a big deal? Am I going to blow seals or something terrible if I don't drain some oil??

You will not blow any seals. How much over is it? Every time I change my oil, when I put the required amount in (as per owner's manual) it is over. Over by about 1/2 the distance between the add and full marks. Overfilling too much will cause the oil to get aerated by the spinning crankshaft. If this isn't happening,... you are fine.

Does 5-1/2 quarts sound about right for a 340 Monsoon?

Indmar's specs say 5.5 is the capacity for the crankcase but that also bepends on the size oil filter you use and the angle that the engine sits in your boat. When you check teh oil level,... check it when boat is in the water and still.

[Baddog]

I usually fill mine to the low mark on the stick in my driveway, then fill it to the center mark when it is floating. i find the level is different on land vs. in the H2O.

[SacKen]

... i find the level is different on land vs. in the H2O.

This is something that has always made me nuts with boats. Manuals always use the generic phrase "level" when talking about the boat with respect to checking and adding fluids. However, I have yet to find one that actually states what "level" means. It would be nice if there was some defined spot on the boat that could be used as a reference point for leveling, per the manufacturers definition of what level means to that boat. I've never even seen a reference to level meaning "as it rests in the water", as most people assume is the correct "level" reference.

Maybe it is a flat spot on the engine, or the floor of the boat itself, or even a little platform that is added somewhere specifically for this purpose. Just large enough for a small level.

For the engine oil, it wasn't a big deal. However, when I changed the tranny fluid, I added about 75% of the spec'd amount of fluid and it was already reading high! I tried changing what I considered "level" and the reading changed dramatically (due to it being a smaller reservoir and fluid amount, I guess).

Waiting until I am on the water, an hour from the house, is just not convenient.

[nuttyskier2002]

However, when I changed the tranny fluid, I added about 75% of the spec'd amount of fluid and it was already reading high! I tried changing what I considered "level" and the reading changed dramatically (due to it being a smaller reservoir and fluid amount, I guess).

Waiting until I am on the water, an hour from the house, is just not convenient.

When checking tranny fluid level,.... check it immediately after shutting off engine. This checks the level before all the fluid drains back to the bottom. That's what the manual says.