Mercruiser 3.7/LX will crank but not turn over.

[bryan.kearney]

In an earlier thread [1] I asked about the neutral kill switch. I found it on the engine block, and figured I was fine because I could un-screw the wires to bypass it if I every got stuck again. We went out several times, no issues I am a new boat owner, but learning.

This last weekend we skiied for about 2 hours, stopped to swim, and tried to start the boat. It would not crank. So.. I bypassed the neutral kill switch, and it would crank but not turn over. We ended up getting towed in because I figured we had flooded the engine. I waited 2 days, but the muffs on it, and tried to crank it up in the drive way. Same thing.. it would crank but not turn over. Is the next thing I need to look at the plugs?

We did get a bit of rain while we were out, about 30 minutes. So when I pulled the doghouse off today, there was some condensation on the engine and block. Do I need to be worried about gas in the tanks? I would assume not since we ran for a good hour or two.

Thanks in advance!

-- bk


[1] http://forums.iboats.com/showthread.php?t=395906

 

[boat127]

Re: Mercruiser 3.7/LX will crank but not turn over.

if it cranks then it's obivosouly turning over

 

[bryan.kearney]

Re: Mercruiser 3.7/LX will crank but not turn over.

OK... it does not start... I can crank it but it will not fire up.

-- bk

 

[Bondo]

Re: Mercruiser 3.7/LX will crank but not turn over.

Ayuh,... Are the sparkplugs Firing,..??
Is there gas gettin' to the cylinders,..??

Fuel, Fire, Compression,+ at the right Time is what it takes to Run....

 

[nola mike]

Re: Mercruiser 3.7/LX will crank but not turn over.

Check spark first. If none, pull your distributor cap and make sure everything's dry. Same goes for all plug wires, connections, etc

 

[bryan.kearney]

Re: Mercruiser 3.7/LX will crank but not turn over.

I looked in the carb, and saw gas going in. I attached a wire to my alternator and tried to get a spark off that wire and it did not work. I am pretty sure I am not getting a spark. I pulled the cap off the distributor and it did not look wet, but i have honestly not looked at one before. Is a little bit wet bad?

-- bk

 

[lonemust]

Re: Mercruiser 3.7/LX will crank but not turn over.

I looked in the carb, and saw gas going in. I attached a wire to my alternator and tried to get a spark off that wire and it did not work. I am pretty sure I am not getting a spark. I pulled the cap off the distributor and it did not look wet, but i have honestly not looked at one before. Is a little bit wet bad?

-- bk

Why the altenator??? If you think you aren't getting power to the coil, run a jumper from the bat pos to the coil pos terminals. that will give you power to the coil without the key on.(hot wired) Not off the altenator. whoever told you to do that was WRONG!! never never do that. One you could(most likely) fry the altenator. And two the engine has to spin atleast 1500rpm's for the altenator to put out power.

 

[bryan.kearney]

Re: Mercruiser 3.7/LX will crank but not turn over.

I have narrowed it down to the tachometer or a tach wire short. I have started a new post at [1] about how to tell the difference.

Thanks for your help!

-- bk

[1] http://forums.iboats.com/showthread.php?t=407923

 

[Bondo]

Re: Mercruiser 3.7/LX will crank but not turn over.

Ayuh,.... Disconnect it At the tach,.... Does it Start,..??
If So,... Deep Six the tach...