No plane, acceleration or rpm merc 3.0

[dfgtye]

2005 Bayliner Merc 3.0 Alpha gen 2. I got this boat with a cottage I bought last year. Took it out one time. Noticed that the bellows wear leaking bad. Five minutes into the ride. The alternator belt broke. I got to the dock pulled the boat. Set it up for the winter. Just did the bellows and shift cable and gimbal bearing. Put on a new prop. Exactly same as old 14.25 x 19 pitch. That's the background. Put it in the water yesterday for the first time since the repairs. Starts easy and idles fine. Revs good in neutral. PROBLEM: I can't get any RPMs in gear. I can barley get it above idle. No plane of course. Checked everything except the compression ( limited tools at the Bay ). Nothing in the prop and actually swapped out with another just in case something was wrong with it. Pulled the fuel filter. Clean. Looks like plenty of fuel flow. Checked the throttle plate. Fully opens. Clean bottom since it was just put in. Oil level good. All spark plugs are new. All wires connected. Fresh gas today. Installed a new flapper valve in the exhaust. Last week. Clean air filter. Tried with and without it. No change. Nothing in the boat so not overloaded and its not overheating. The boat ran fine last year. Popped right up on plane. Any ideas. Sorry about the long post. I am at my wits end.

 

[alldodge]

Re: No plane, acceleration or rpm merc 3.0

Is the throttle cable connected to the throttle plate lever?

Sorry just noticed it does rev in neutral, going to do some more research

 

[Wakesilver]

Re: No plane, acceleration or rpm merc 3.0

Any smell of burning rubber or black bits in the engine compartment?

 

[alldodge]

Re: No plane, acceleration or rpm merc 3.0

I am coming up empty, but I am also assuming that you are moving the throttle full forward and the engine is still basically at idle or barely above. The 3.0 has a in gear sensor, shift interupter and maybe a rev limiter but none of these could cause what I believe your seeing. Now if the RPMs are coming up but your not moving it could be what wakesilver mentioned .

Any smell of burning rubber or black bits in the engine compartment?

 

[Don S]

Re: No plane, acceleration or rpm merc 3.0

PROBLEM: I can't get any RPMs in gear. I can barley get it above idle.

When you give it throttle, does the engine die? does the sound change at all? Like it's sucking a lot of air and no gas? Does the rpm go up at all?

 

[dfgtye]

Re: No plane, acceleration or rpm merc 3.0

Clean engine compartment. No burning no rubber bits. No the shift interrupter. That is working fine. I can shift easily between fwd and reverse. The boat does move. When I put it in gear I can go fwd/rv. The idle comes up just a bit. The boat is acting like it has a giant prop and the engine can't move it. Almost like if you have a stick shift car and try to take of in 3 rd gear. Doesn't matter how much gas it gets. I'd suspect a plugged exhaust. Except that I just replaced the flapper valve and the manifold gasket and had the outdrive off so I know it's clear

 

[Bondo]

Re: No plane, acceleration or rpm merc 3.0

Ayuh,... When was the last tune up, 'n filter change,..??

What color are the spark plugs,..??

Compression test,..??

Ya did leave the trailer in the parkin' lot, Right,..?? :lol:

 

[dfgtye]

Re: No plane, acceleration or rpm merc 3.0

Brand new plugs, clean air filter, clean fuel filter. Oil changed. New oil filter. New alternator/water pump belt. New flapper valve. New exhaust gasket. New bellows and shift cable. New outdrive water pump. Checked engine alignment when outdrive was installed. New gimbal bearings. New gas.

 

[Chef Shawn]

Re: No plane, acceleration or rpm merc 3.0

Exhaust flapper or fuel filter in backwards? Either one could cause that. I've done the latter....oil in the out-drive? Can you manually turn the prop in and out of gear?

 

[dfgtye]

Re: No plane, acceleration or rpm merc 3.0

Exhaust flapper or fuel filter in backwards? Either one could cause that. I've done the latter....oil in the out-drive? Can you manually turn the prop in and out of gear?

Fuel filter is in correct. Flapper just installed and is directionally correct. It is installed so it is closed if water comes up the pipe toward the motor. Opens freely if pressure comes from the motor oriented in the closed position like an arrow pointing up. Are you referring to the flapper just being flipped? It looks pretty much the same from both sides. I can turn the prop with no resistance in neutral. Positively locks and ratchets in fwd and rev.

 

[Bondo]

Re: No plane, acceleration or rpm merc 3.0

Brand new plugs, clean air filter, clean fuel filter. Oil changed. New oil filter. New alternator/water pump belt. New flapper valve. New exhaust gasket. New bellows and shift cable. New outdrive water pump. Checked engine alignment when outdrive was installed. New gimbal bearings. New gas.

Ayuh,.... I don't see compression test listed,...

 

[Bt Doctur]

Re: No plane, acceleration or rpm merc 3.0

No mention of checking/replacing the drive gear oil.With the engine off shift into gear, and try moving the prop by standing on a blade.
prop turns,motor dosent means coupler or drive issues.

 

[dfgtye]

Re: No plane, acceleration or rpm merc 3.0

Gear oil has been changed. Full resovior as well. Old oil looked good not cloudy or mixed with water. Also installed new seals on the drain plugs. Prop is positively engaged when in gear. Does not move in gear. Only thing I haven't been able to check. (Don't have the tools with me) is spark and compression. Wondering if maybe a bad plug or non firing cylinder. I don't know how the compression would go from good to bad. Just from sitting over the winter. But I will check that tomorrow just to rule it out.

 

[dfgtye]

Re: No plane, acceleration or rpm merc 3.0

Ok. Not good. No compression in 2&3 cylinder. 150lbs in 1 and 148 in 4. Blown head gasket? Valves or something else. Sucks.

 

[Bondo]

Re: No plane, acceleration or rpm merc 3.0

Ok. Not good. No compression in 2&3 cylinder. 150lbs in 1 and 148 in 4. Blown head gasket? Valves or something else. Sucks.

Ayuh,.... Probably a blown head gasket 'tween 'em,....

Hopefully ya caught it before it eroded a channel in the head, or worse yet, the block,...