Engine bogging dowwn

[afd2131]

Ok, for starters, I have a 1992, Force 120HP Outboard. The engine has been running great all summer, however today the engine began to bogg down when you throttled up. The engine wouldnt go into a higher speed. The boat crawled back to the dock, then in the middle of the lake the engine died. When I went to restart it, the battery seemed drained like it didnt have enough juice to turn over the engine. Any thoughts?

 

[Jiggz]

Re: Engine bogging dowwn

Bogging down like misfiring? Or just not coming up to speed but firing normally? There is a big difference between the two. The first one can be mechanical problem due to loss of compression in one of the cylinders or spark problem. The second one could be fuel related problem or throttle position problem. Can you specify which one is the best symptom for you problem?

 

[afd2131]

Re: Engine bogging dowwn

I wasnt there personally, but it was described to me like the engine wasnt getting any fuel, I was told first thought was a clogged fuel filter. Last weekend when I used it, there was no problem wregarding any misfiring at all. The powerhead is less then 10 years old. Last week before we left, we noticed what looked liked a missing screw on the top of the engine on the right/front side if your looking at it with the cover off. There was a small amount of water coming out of the screw hole, my uncle said it needed to be plugged as it was used for some kind of testing. We plugged it up with something found on board. Now this happens the next week, wondering if theres a connection here.

 

[Jiggz]

Re: Engine bogging dowwn

The best thing to do is to find out first hand what are the symptoms of the problem. Misfiring or lack of fuel? As for the missing screw, with oozing water, the only thing I can think off is the one close to the thermostat but this is located on the top back end and almost center of the top block end. A picture will be very helpful.

 

[afd2131]

Re: Engine bogging dowwn

Ok, little update here. I took the boat out this morning to diagnose the problem. The battery drain problem was in fact the pinion wheel wasnt engaging the flywheel..little WD40 fixed that problem, works perfectly. Engine starts right up and idles just fine, I popped the engine out of gear and rev'd up the engine, still seems fine. When I hit open water, I throttled up to full and the engine runs great for about 20 sec, then it begins to bogg down. At first I thought I bumped the throttle back, but it seems like the engine cant get any fuel. The second time today I tested it, the engine died completely, but restarted just fine. I took it back to the dock at low speed, again no problems. This definetley isnt a misfire or compression problem. Is this possibly bad gas, or a clogged fuel filter?

Ive also included a picture of the missing screw on the engine head, water drips from it, in a very small amount. Its obvious there was a screw there at some point..

 

[pnwboat]

Re: Engine bogging dowwn

Missing bolt needs to be replaced ASAP. I believe it's a 1/4 20 thread. Not sure how long it is. That bolt holds the exhaust cover (the finned cover) on. There is a gasket under the cover which seals the water passage that is under the cover. What you are seeing is cooling water that is leaking out. Worse case scenario, it may also be leaking internally into the exhaust cavity. You want to avoid this as water can get sucked into one or more of the cylinders.

As far as the bog, what you describe does sound like it may be a fuel delivery issue. If you have an in line fuel filter, you should replace or clean it out. Make sure the gas tank vent is not closed or plugged. Just before it would normally start to bog, try squeezing the primer bulb quickly multiple times. If that "fixes" the bog, then I would suspect that the fuel pump diaphragm needs to be replaced.

 

[afd2131]

Re: Engine bogging dowwn

Ok, I will replace the bolt. Does anyone know where to get a fuel filter at? The engine is a 91 Force Outboard, 120hp. I was looking at Crowley Marine, any other ideas of a place to go?

Missing bolt needs to be replaced ASAP. I believe it's a 1/4 20 thread. Not sure how long it is. That bolt holds the exhaust cover (the finned cover) on. There is a gasket under the cover which seals the water passage that is under the cover. What you are seeing is cooling water that is leaking out. Worse case scenario, it may also be leaking internally into the exhaust cavity. You want to avoid this as water can get sucked into one or more of the cylinders.

As far as the bog, what you describe does sound like it may be a fuel delivery issue. If you have an in line fuel filter, you should replace or clean it out. Make sure the gas tank vent is not closed or plugged. Just before it would normally start to bog, try squeezing the primer bulb quickly multiple times. If that "fixes" the bog, then I would suspect that the fuel pump diaphragm needs to be replaced.

 

[pnwboat]

Re: Engine bogging dowwn

IBoats has the fuel filters.

http://reviews.iboats.com/Mallory-Filter-Fuel-5-16-Inline-9-37959/dm/review_action.all--view_id.365276

 

[emoney]

Re: Engine bogging dowwn

Any generic filter will work, but....do you have a fuel/water separator installed? If not, that's what I'd put in there and eliminate the in-line filter. They are so succeptible to leaks. Plus, the larger f/w/separators work a lot better. They sell a kit and it's a simple install. Mine is mounted in the splash well so it's very easy to get to and gets changed every year. I may opt for the one with the glass bottom that allows you to drain the water next time, mainly so I can see what's in there.

 

[afd2131]

Re: Engine bogging dowwn

Ok, another update on this. I took the boat out today and the engine bogged down again. It soun ds like the engine isnt getting the proper power to it, I can definetley hear a diffrence in the pitch of the engine sound. We did install a new throttle on the boat this spring, but have had no problems with it. Could something in regards to the throttle have come out of wack?

 

[emoney]

Re: Engine bogging dowwn

Assuming you're just omitting the word "cable", then I wouldn't think a bad throttle cable would cause the motor to bog down and then die. I'd start by taking the fuel pump cover off and looking at the diaphragm. Make sure it's not torn, cracked or flaking. Will the boat get up on plane and then "bog down"?

 

[jerryjerry05]

Re: Engine bogging dowwn

Do a comp test anyway.
Then do a emoney suggests.Check the fuel pump diaphrams.
They used 2 different pumps on that motor.
Include Serial# Model# Profile,location?

Then check the hoses,Ethanol is melting older hoses and causing cloggs in the system.
Drop the float bowl and see if there is gunk in there??
Check for soft hoses.
Check for vent line blockage.