150 Mariner Problems

[WRIGHTWARREN]

I Have A 150 Mariner That Starts Right Up.With The Ear Muffs On It Idles Perfect And Revs Up Perfect.When I Put It In Water It Just Wont Go.compression Is Good,spark On All 6 Cyl. When Its Under Load It Just Wont Go.The Prop Was Changed Recently.Could This Be The Problem Or Should I Check Something Else?

 

[Chris1956]

Re: 150 Mariner Problems

Does it stall when you give it throttle? If so, the carbs are likely set too lean. Did you mess with the idle mixture settings.

 

[WRIGHTWARREN]

Re: 150 Mariner Problems

Sometimes It Will Stall When You Throttle And Sometimes It Wont.i Have Not Messed With Anything Except The Prop.it Was Running Perfect Before Now.

 

[CharlieB]

Re: 150 Mariner Problems

Clean your carbs, dirty idle passages lean the mixture and cause those symptoms.

Be glad it happened, it may have saved you from melting pistons from running lean while WOT on the water.

 

[WRIGHTWARREN]

Re: 150 Mariner Problems

Thanks For The Info.im Going To Clean Them Today.

 

[WRIGHTWARREN]

Re: 150 Mariner Problems

Cleaned The Carbs Again And Still Have The Same Problem.it Just Wont Go Under Load.any More Suggestions Out There.please Help.

 

[CharlieB]

Re: 150 Mariner Problems

A weak High Speed Winding in the Stator can be tested with a DVA Meter.

Low voltage to one ignition module will limit RPM under load, yet rev fine in Neutral.

At cranking speed, DVA readings should be

20 DVA on each Red, High speed windings (each Red to ground)

180 DVA on each Blue, Low speed windings (each Blue to ground)

Tests may be made running, the High speed voltage should rise with RPM such that by 2000 voltage should become greater than the low speed voltage to each ignition module. Either module receiving a low high speed voltage will lose spark intensity and fail to spark under loads.

 

[WRIGHTWARREN]

Re: 150 Mariner Problems

Thanks For The Info.i Will Test First Chance I Get And Let You Know The Results.

 

[j_martin]

Re: 150 Mariner Problems

Cleaned The Carbs Again And Still Have The Same Problem.it Just Wont Go Under Load.any More Suggestions Out There.please Help.

Spraying carb cleaner down the throat of the carbs has no effect on anything imortant, except it washed the oil off the engine parts and causes damage. You have to remove and tear down the carbs to clean them.

 

[sschefer]

Re: 150 Mariner Problems

1. When you say "Won't go" do you mean no forward motion?
2. When you changed your prop, did you put the exact same size and pitch prop on it?
3. Did the new prop come with a new hub or did you buy one with a end user replaceable hub like a Flo-Torque II hub?
4. With the engine out of the water and in reverse gear, REMOVE THE KEYS FROM THE IGNITION, REMOVE THE SAFETY LANYARD AND REMOVE THE PLUG WIRES, REMOVE THE SPARK PLUGS, then see if you can turn the prop by hand. You should not be able to turn it by hand without also turning over the engine. In forward gear the prop should ratchet in one direction and turn the engine over in the other.

PLEASE be sure to follow the instructions in item 4 carefully. Any engine can spontaneously combust with or without the ignition on if the cylinders are capable of making compression. You don't want to find this out while your hand is on the prop.

 

[WRIGHTWARREN]

Re: 150 Mariner Problems

Spraying carb cleaner down the throat of the carbs has no effect on anything imortant, except it washed the oil off the engine parts and causes damage. You have to remove and tear down the carbs to clean them.

I`VE COMPLETELY DISSASSEMBLED THE CARBS AND CLEANED THEM AND REPLACED ALL GASKETS.

 

[WRIGHTWARREN]

Re: 150 Mariner Problems

1. When you say "Won't go" do you mean no forward motion?
2. When you changed your prop, did you put the exact same size and pitch prop on it?
3. Did the new prop come with a new hub or did you buy one with a end user replaceable hub like a Flo-Torque II hub?
4. With the engine out of the water and in reverse gear, REMOVE THE KEYS FROM THE IGNITION, REMOVE THE SAFETY LANYARD AND REMOVE THE PLUG WIRES, REMOVE THE SPARK PLUGS, then see if you can turn the prop by hand. You should not be able to turn it by hand without also turning over the engine. In forward gear the prop should ratchet in one direction and turn the engine over in the other.

PLEASE be sure to follow the instructions in item 4 carefully. Any engine can spontaneously combust with or without the ignition on if the cylinders are capable of making compression. You don't want to find this out while your hand is on the prop.

WONT GO MEANING WONT DO OVER 5-10 MPH.THE NEW PROP HAS 21 PITCH AND OLD ONE HAD 23 AND IT CAME WITH A HUB.

 

[j_martin]

Re: 150 Mariner Problems

We sure could use some information.

Does your throttle advance fully? (advance the throttle, and look down the carb throats. Do they open fully?

When it won't go, does it bog, cut out cleanly, or something else?

 

[sschefer]

Re: 150 Mariner Problems

WONT GO MEANING WONT DO OVER 5-10 MPH.THE NEW PROP HAS 21 PITCH AND OLD ONE HAD 23 AND IT CAME WITH A HUB.

O.K. We can safely eliminate the prop as the problem IF at 5-10 mph you are not over revving.

Warren, what year is your engine. Since it's carbed, I'm taking a shot at it having three two barrel carbs, and being around a 1986 is that close?

If so, check your timing advance linkage. It sounds to me like somethings bound up. This might have happened if you changed the inline fuel filter or something in that area. If I've got the correct model, then there is also a ball joint that connects to the trigger arm and advance linkage. Make sure it's moving the trigger freely.

 

[WRIGHTWARREN]

Re: 150 Mariner Problems

O.K. We can safely eliminate the prop as the problem IF at 5-10 mph you are not over revving.

Warren, what year is your engine. Since it's carbed, I'm taking a shot at it having three two barrel carbs, and being around a 1986 is that close?

If so, check your timing advance linkage. It sounds to me like somethings bound up. This might have happened if you changed the inline fuel filter or something in that area. If I've got the correct model, then there is also a ball joint that connects to the trigger arm and advance linkage. Make sure it's moving the trigger freely.

YOUR PRETTY CLOSE ITS A 1984.EVERYTHING SEEMS TO BE WORKING PROPERLY AND FREE.COULD THIS BE A TRIGGER PROBLEM? WITH THE MUFFS ON IT REVS FINE.IN THE WATER IT WONT REV OVER 2000RPM AT FULL THROTTLE IN GEAR.THIS BOAT USED TO SCREAM ON THE WATER.NOW IT WONT GO OVER 10MPH WOT.I REPLACED THE STATOR ABOUT A MONTH AGO WITH A NEW ONE AND NEW SWITCHBOXES ALSO.TRIGGER IS THE SAME ONE THAT HAS ALWAYS BEEN ON THERE.IS THERE A WAY TO CHECK IT OTHER THAN A DVA METER?

 

[WRIGHTWARREN]

Re: 150 Mariner Problems

We sure could use some information.

Does your throttle advance fully? (advance the throttle, and look down the carb throats. Do they open fully?

When it won't go, does it bog, cut out cleanly, or something else?

THE THROTTLE ADVANCES FULLY AND IT WONT GET OVER 2000RPM IN THE WATER UNDER LOAD.EVENTUALLY IT WILL DIE AND THEN START RIGHT UP AND DO THE SAME THING AGAIN.CARB THROATS ARE OPEN FULLY.WITH THE MUFFS ON OUT OF WATER IT REVS FINE AND REVS UP FINE IN THE WATER IN NUETRAL BUT IN GEAR IN WATER IT WONT GO OVER 2000 RPM.I TRIED FEEDING THE THROTTLE SLOWLY BUT IT STILL WONT REV UP IN GEAR.

 

[sschefer]

Re: 150 Mariner Problems

You said you rebuilt the carbs and that the stator has been replaced. Did a link and synch procedure get done on the engine each time? That may be all it needs.

You mention that it ran great before you changed props. Was that last last season and was it stored for a couple of months without use? I'm trying to determine if we're overlooking somthing really obvious.

Sorry for the pesky questions.

 

[WRIGHTWARREN]

Re: 150 Mariner Problems

You said you rebuilt the carbs and that the stator has been replaced. Did a link and synch procedure get done on the engine each time? That may be all it needs.

You mention that it ran great before you changed props. Was that last last season and was it stored for a couple of months without use? I'm trying to determine if we're overlooking somthing really obvious.

Sorry for the pesky questions.

everything is in order as far as link and sync.it ran great and i hit a log in the water that damaged the prop.not enough damage that i could not use it but some damage.we went on fishing the rest of the day with no problems.that was on a thursday.i got a new prop friday and went back out saturday.it has not ran under load since.i put the old prop back on and same problem.it will rev up out of water but when in water and put in gear it just wont go over 5-10mph.i ruled out the prop now but it has to be something electrical i believe.thanks for all the help.

 

[WRIGHTWARREN]

Re: 150 Mariner Problems

Thanks For All The Help Guys. A Friend Brought His Dva Meter Over And Tracked It Down To The Trigger.replaced The Trigger And It Runs Better And Faster Than Ever.gets On Plane In No Time At All.thanks Again!