Was curious if there is a way to rotate a outboard cylinders like I do with a inboard motor with a breaker bar. I would guess I would have to do it from the fly wheel and the drive would have to be in neutral. I am trying to find out if i siezed the motor. Any tips would be appreciated. Motor is a 2000 Johnson 200 hp.
Rotating a 200hp outboard with a breaker bar
- Thread starter ALKA2710
- Start date
I really hate the idea of trying to turn any engine over by using any nut. If it's frozen any you put too much pressure and strip the crank shaft...
Rather try turning the engine by putting a large screwdriver against a flywheel tooth and something solid and pry it.
Rather try turning the engine by putting a large screwdriver against a flywheel tooth and something solid and pry it.
- Joined
- Jul 12, 2007
- RO Number
- 27413
- Messages
- 1,164
Make sure you're in neutral. If you can borrow or rent one, use a flywheel turner rather than a large screwdriver. Don't force the teeth; you'll break them. If it's stuck, try an old auto mechanic's trick. (The trick is old, not the mechanic.) Boil a pot of vinegar and pour the hot mixture into the cylinders through the spark plug holes. Replace the plugs and let it sit overnight. Then remove the plugs and try turning the flywheel. The hot vinegar may loosen any rust to free the rings and pistons. Good luck. Hy
Not sure what happened to motor. We are trouble shooting now. While coming in at just above idle and shifting to neutral the motor stalled and would not start. The starter is engaging but its not able to turn the motor over. Figured we have to start some where so will pull the plugs to see if any water and if the motor will crank. I was thinking that something might have siezed and is keeping the motor from turning over. Wanted to rule out a siezed motor first if i can turn it by hand. There was no strange noises or clanks or clunking when she died but motor is 14 seasons old and not always flushed.
Al
Al
When an I/O acts jammed up, it's common to remove the Outdrive to show which major component (engine or outdrive) is the source of the binding. Likewise, suggest you drop the Lower Unit, as if you were to replace the water pump.
There is NOT as much friction in an O/B, even a V6, as there is in an automotive engine converted to marine, like an I/O.
A socket that fits the flywheel nut, with just a ratchet, should rotate the powerhead easily, given the sparkplugs are out.
The V4 and V6 OMC O/B's I've tinkered with had a large flywheel nut, probably around 1-1/4". It ought to be safe to rotate the crankshaft with it. If it jams up and won't turn, something's jammed inside.
You might be able to inspect inside the cylinders with a small flashlight.
The head fits through a sparkplug hole and you could get a couple peeks inside each cylinder. Otherwise, powerhead jammed up with plugs out and gearcase removed - see if your model has intake port covers. If so, pull them and look at what you can see of the pistons. Those gaskets are cheaper than Head Gaskets. Pulling Heads would be next.
Some OMC V6 "Looper" engines had a hot spot in a cylinder at the end of the line in the cooling water path. That cylinder, one of the two lower ones and I forget which, would blow. You might pull an Intake Cover and God Forbid see damage or find bearing needles. That would be Very Bad, but would be an answer.
There is NOT as much friction in an O/B, even a V6, as there is in an automotive engine converted to marine, like an I/O.
A socket that fits the flywheel nut, with just a ratchet, should rotate the powerhead easily, given the sparkplugs are out.
The V4 and V6 OMC O/B's I've tinkered with had a large flywheel nut, probably around 1-1/4". It ought to be safe to rotate the crankshaft with it. If it jams up and won't turn, something's jammed inside.
You might be able to inspect inside the cylinders with a small flashlight.
The head fits through a sparkplug hole and you could get a couple peeks inside each cylinder. Otherwise, powerhead jammed up with plugs out and gearcase removed - see if your model has intake port covers. If so, pull them and look at what you can see of the pistons. Those gaskets are cheaper than Head Gaskets. Pulling Heads would be next.
Some OMC V6 "Looper" engines had a hot spot in a cylinder at the end of the line in the cooling water path. That cylinder, one of the two lower ones and I forget which, would blow. You might pull an Intake Cover and God Forbid see damage or find bearing needles. That would be Very Bad, but would be an answer.
plug your model number in http://www.boats.net/parts/search/BRP/JOHNSON/2000/parts.html