1993 Mercruiser 3.0 new to me, with major problems, Not Running, Water mixed with oil

[saltybutwet]

Re: 1993 Mercruiser 3.0 new to me, with major problems, Not Running, Water mixed with

that pic has the same firing order has my 3.0L

thanks! I will redo my firing order to match the pic, and see what happens, if she backfires through the carb, I will reset the dizzy

 

[Bondo]

Re: 1993 Mercruiser 3.0 new to me, with major problems, Not Running, Water mixed with

1. How do i wire the Momentary switch, that I bought for the starter, and the 0n/Off toggle switch for the coil, so I can try to start the engine

Ayuh,... To power the ignition, ya go from the battery to the (+) on the coil,....

To power the starter, go from the battery to the red/ yellow wire terminal, on the starter's solenoid,...

 

[wrench 3]

Re: 1993 Mercruiser 3.0 new to me, with major problems, Not Running, Water mixed with

The + on the coil can be hard to connect too on your engine. Check the information I gave you on post #99.

 

[saltybutwet]

Re: 1993 Mercruiser 3.0 new to me, with major problems, Not Running, Water mixed with

The + on the coil can be hard to connect too on your engine. Check the information I gave you on post #99.

thanks I got it figured out, and started her up, she runs good! and sounds good, however.. ran the engine for about 30 minutes, still starts great, but have a noticeable slight misfire. I have new plugs gapped at .035, new wires, but old dizzy cap and rotor, the terminals had carbon so i removed is as good as i could. I will order a new cap and rotor

how would you hook up external fuel tank for this?.
I had the fuel pump hose run into a clear plastic jar lid, with an additional tiny hole in the lid for air.The fuel line i'm using is clear. The fuel pump is mechanical, and needs to the suck the fuel, but the fuel line is not always full, because I have the jar sitting on the ground

Any ideas on what else could cause that slight misfire? other than that, no other issues, except for seeing my gas disappear quickly, lol is this normal
Im no planning on putting the engine back in, until i know for sure all the bugs are worked out, first
Thanks for any advice

 

[wrench 3]

Re: 1993 Mercruiser 3.0 new to me, with major problems, Not Running, Water mixed with

Your miss could be a fuel mixture problem. Have you tried adjusting the idle mixture screws?
It sounds like the only problem with your fuel supply is the size of the tank. If I need a temporary fuel tank I drop a couple of feet of copper pipe with neoprene hose attached to it into a five gallon gas can.

 

[saltybutwet]

Re: 1993 Mercruiser 3.0 new to me, with major problems, Not Running, Water mixed with

Your miss could be a fuel mixture problem. Have you tried adjusting the idle mixture screws?
It sounds like the only problem with your fuel supply is the size of the tank. If I need a temporary fuel tank I drop a couple of feet of copper pipe with neoprene hose attached to it into a five gallon gas can.

I haven't messed with the one and only idle mixture screw, but I can

I will try and use that 6gal boat fuel tank for increasing the size, now do I need to elevate the tank, for gravity feeding the fuel pump?
thanks for the advice

 

[wrench 3]

Re: 1993 Mercruiser 3.0 new to me, with major problems, Not Running, Water mixed with

Rodger on the single screw. I forgot that you have a Mercarb, not a Rochester.
The fuel pump should draw up a couple of feet, no problem.

 

[fishrdan]

Re: 1993 Mercruiser 3.0 new to me, with major problems, Not Running, Water mixed with

New cap & rotor, definitely. I think you have an EST electronic ignition, but if points, replace the points and condenser too.

As suggested earlier, I would play with the idle mixture to see if the mis-fire goes away. BEFORE, messing with the idle mixture, note the screw's position, then turn it in all the way lightly seating it while counting how many turns it takes to seat it. This will give you a base line of where it started at. The carb could have junk in too, possibly needing a rebuild.

Fuel tank sits on ground as the pump will suck uphill. I used a 5-gallon can with a section of 3/8 fuel line shoved down the fill tube, nice snug fit, but this was an older gas can that had the accordion style flexible fill tube/spout.

Fixing everything with the engine on the ground is going to be easier, so good thought on keeping it out of the boat until it's running 100%.

 

[saltybutwet]

Re: 1993 Mercruiser 3.0 new to me, with major problems, Not Running, Water mixed with

New cap & rotor, definitely. I think you have an EST electronic ignition, but if points, replace the points and condenser too.

As suggested earlier, I would play with the idle mixture to see if the mis-fire goes away. BEFORE, messing with the idle mixture, note the screw's position, then turn it in all the way lightly seating it while counting how many turns it takes to seat it. This will give you a base line of where it started at. The carb could have junk in too, possibly needing a rebuild.

Fuel tank sits on ground as the pump will suck uphill. I used a 5-gallon can with a section of 3/8 fuel line shoved down the fill tube, nice snug fit, but this was an older gas can that had the accordion style flexible fill tube/spout.

Fixing everything with the engine on the ground is going to be easier, so good thought on keeping it out of the boat until it's running 100%.

Thanks for the info
I ordered my cap and rotor from iboat, last night
Should be here in 2 days
I will adjust the idle this evening, and see if i can iron out that little misfire
I also have a 6 gal extra boat fuel tank that i can use
Thank u again

 

[saltybutwet]

Re: 1993 Mercruiser 3.0 new to me, with major problems, Not Running, Water mixed with

I have a video for ya'll...
Mercruiser 3.0, I took this video this evening after work. It starts up cold really easy , and runs vary well.
The engine may sound like it is running at higher than 1/4 throttle, but it's not. I did take care of the misfireing, this evening, with actually using a 6 gal plastic boat tank with a vented cap, and adjusting the carb mixture a small amount. I still have the old dizzy cap and rotor, but ordered one, and it is on it's way.

I let the engine run for about 40 minutes, and it didn't even misfire, of flinch at all...I feel good!

I still have a lot more test runs, and things to check out, but still feel confident that this will be a good engine, just hope the "Wendys Frosty Oil" doesn't come back

 

[wrench 3]

Re: 1993 Mercruiser 3.0 new to me, with major problems, Not Running, Water mixed with

We'll keep our fingers crossed, but it's looking good so far.
Just a side note on the distributor cap. Back when tune ups were a yearly thing, they told us not to remove the corrosion from the terminals in the distributor cap because the corrosion had less resistance than the air gap produced by removing it. But a new cap works even better.

 

[saltybutwet]

Re: 1993 Mercruiser 3.0 new to me, with major problems, Not Running, Water mixed with

We'll keep our fingers crossed, but it's looking good so far.
Just a side note on the distributor cap. Back when tune ups were a yearly thing, they told us not to remove the corrosion from the terminals in the distributor cap because the corrosion had less resistance than the air gap produced by removing it. But a new cap works even better.

thanks! wrench3
I am getting close to closing this thread soon with a good ending for this 3.0 , and starting a new one with different topic
this has been one heck of a good ride

 

[saltybutwet]

Re: 1993 Mercruiser 3.0 new to me, with major problems, Not Running, Water mixed with

I do have a question

When the water constantly circulates cold water from my garden hose,through the seawater system, with T-stat in, before engine is started out of the boat, like i'm doing now.
How long will i have to run the engine, before the T-stat opens and lets cool wated circulate around the block?

 

[Bondo]

Re: 1993 Mercruiser 3.0 new to me, with major problems, Not Running, Water mixed with

I do have a question

When the water constantly circulates cold water from my garden hose,through the seawater system, with T-stat in, before engine is started out of the boat, like i'm doing now.
How long will i have to run the engine, before the T-stat opens and lets cool wated circulate around the block?

Ayuh,.... I doubt it'll ever get hot enough, sittin' on the floor,...

'n Why would ya run it that long on the floor, Anyways,...

 

[saltybutwet]

Re: 1993 Mercruiser 3.0 new to me, with major problems, Not Running, Water mixed with

Ayuh,.... I doubt it'll ever get hot enough, sittin' on the floor,...

'n Why would ya run it that long on the floor, Anyways,...

Bondo
I want wasn't sure that this engine would get hot enough running it on the floor. I just want to ensure that she runs like it should, and any tweaks that I need to do to the engine, if anything pops up, I want to do while I have it out

also want to run it so I can ensure that the engine oil is free from any water contamination, which I thought would have showed up by now, however the new engine oil is not as clear as it has been, just noticed that this evening, maybe nothing, but again maybe it is something, not sure yet

hope that makes sense, lol

 

[saltybutwet]

Re: 1993 Mercruiser 3.0 new to me, with major problems, Not Running, Water mixed with

I need to hook up the alternator, so it can maintain the charge in the dedicated battery, while she runs. I start to get a misfire, when the battery charge starts to drop

 

[saltybutwet]

Re: 1993 Mercruiser 3.0 new to me, with major problems, Not Running, Water mixed with

here is a pic of 2 drops of oil from the dipstick

the drop highlighted in "Yellow" was done last night, and was the same color as the drop of oil in "Red" , but after sitting all night, and day. I got home at 6:30 pm this evening and the drop of oil had cleared up.

The drop of oil in " Red" was just taken from the dipstick, 15 minutes ago, from a cold engine, I did not start it up....

so i would appreciate any opinions please. I still feel like it is just dirty, can't really see any water in it at this point

 

[saltybutwet]

Re: 1993 Mercruiser 3.0 new to me, with major problems, Not Running, Water mixed with

just went back out to look at the oil again 8:30, and now it looks clean...what gives?

 

[saltybutwet]

Re: 1993 Mercruiser 3.0 new to me, with major problems, Not Running, Water mixed with

I'm thinking it's just gunk left in the engine, not water
Water is what i was worried about

I will run the engine a few more times, and then change oil and filter
And keep moving forward

 

[saltybutwet]

Re: 1993 Mercruiser 3.0 new to me, with major problems, Not Running, Water mixed with

Well I guess I spoke too soon.........hope it's just condensation...the oil level has not risen on the dip

alos these brand new plugs look like the engine is running rich, they all look like the #1 plug