3.0 OMC 4cyl HELP!!!! SLOW CRANK BUT NO START

[qdesenti]

Hey guys, i recently just the boating game, ive worked on cars my hole life but have been told that boats are a different world. Anyways, i bought a 3.0 OMC 4cyl and it does crank but no start, personally it seems to crank slow but im also used to car engines. i know it needs a carbourator and a new alternator, but that still doesnt help, with the fact it seems to turn over slowly. i dont know much, nor where to really start. Any ideas would be really helpful!!!

 

[alldodge]

A boat motor is a truck motor and should turn over the same speed.
Clean both ends of the battery cables to shinny metal. Check your points
Drip a small amount of gas down the carb to see if it fires

 

[qdesenti]

A boat motor is a truck motor and should turn over the same speed.
Clean both ends of the battery cables to shinny metal. Check your points
Drip a small amount of gas down the carb to see if it fires

so found out that the starter was just going bad and got a new starter, but i also just got a new carb for it , but what i am wondering what is a easy way to clean out the old gas out of all the lines

 

[alldodge]

Remove all the lines and see if they need cleaning or replacement
Can spray some carb cleaner thru the lines to help

Remove the fuel filter and replace and clean it, but this depends on which filter is installed

 

[qdesenti]

Remove all the lines and see if they need cleaning or replacement
Can spray some carb cleaner thru the lines to help

Remove the fuel filter and replace and clean it, but this depends on which filter is installed

okay cool, now the next thing i have is that the previous owner said the shifter cable broke but how can i verify that without taking anything apart or without having the motor running. it that even possible?

 

[alldodge]

okay cool, now the next thing i have is that the previous owner said the shifter cable broke but how can i verify that without taking anything apart or without having the motor running. it that even possible?

Shift into forward and see if the prop locks in one direction, then shift to reverse and see if it also does it.

That said, you should remove the drive, drain the gear lube and replace the impeller in the drive, and may need to rebuild the pump.

Pressure test the drive after impeller replacement at 10 psi and check for leaks

Then check gimbal bearing and alignment

 

[qdesenti]

Shift into forward and see if the prop locks in one direction, then shift to reverse and see if it also does it.

That said, you should remove the drive, drain the gear lube and replace the impeller in the drive, and may need to rebuild the pump.

Pressure test the drive after impeller replacement at 10 psi and check for leaks

Then check gimbal bearing and alignment

So if it does lock into place thats a good sign? and if it doesnt then its not ?

 

[qdesenti]

Shift into forward and see if the prop locks in one direction, then shift to reverse and see if it also does it.

That said, you should remove the drive, drain the gear lube and replace the impeller in the drive, and may need to rebuild the pump.

Pressure test the drive after impeller replacement at 10 psi and check for leaks

Then check gimbal bearing and alignment

also whats the original carb for the 1990 omc 3.0, im trying to look everywhere for it but i cant find the part # and cant dont have to original one with it

 

[alldodge]

If it doesn't lock then the cable is broken or something is disconnected

Most 3.0 used the holley 2bbl, or Rochester 2GC carb
Only way to know for sure is if you can give us the serial number of the motor

 

[qdesenti]

If it doesn't lock then the cable is broken or something is disconnected

Most 3.0 used the holley 2bbl, or Rochester 2GC carb
Only way to know for sure is if you can give us the serial number of the motor

If it doesn't lock then the cable is broken or something is disconnected

Most 3.0 used the holley 2bbl, or Rochester 2GC carb
Only way to know for sure is if you can give us the serial number of the motor

T01187672 is the serial number

 

[qdesenti]

another one just incase is T00699772, those are the two i have on the stick on the valve cover

 

[alldodge]

That number isn't coming up
What year is it?

 

[qdesenti]

its a 1990, model # 302bmrpws

 

[alldodge]

That works, it came with a Holley 2V 2bbl carb
Carb kit number 0986794