50 Hp Johnson -97, Powerloss and Oli warning

[Leijon]

After about 30-100 seconds at 4500 rpm my engine loses power and almost drops to idle. After a second it comes back for a few seconds and drops again. This is repeated for number of rounds and than the engine dies. When I start it up again and the whole thing starts over again. If I squeeze the pumpbulp the power stays but after a while the No-Oil alarm starts.

In spite of the following actions the problem remains:

• New spark plugs, with the right gap.
• Cleaned carb, and adjusted
• New fuel tank
• New fuel hose
• New pump bulb
• New fuel filter
• Fuel tank vent is ok
• Tightened hose clamps
• Ignition adjusted
• New air pump diaphragm in VRO
• Compression tested and is ok
• Oil tank is about 50% full

Please any one, what do I do next to cure the problem?

Thanks
Leijon

 

[tashasdaddy]

Re: 50 Hp Johnson -97, Powerloss and Oli warning

is it running hot? it could be going to slow mode 2500rpms, or bad sensor.

 

[Leijon]

Re: 50 Hp Johnson -97, Powerloss and Oli warning

Well, I can not rule that out but there is no over heating alarm going off.
Is there a way for me to tell if it is runing to hot?

Could realy scueezing the pumpbulb override the Slow-Mode?

In the self diagnistic sequens, prior to start up, every thing looks normal.

Regards
Leijon

 

[bugmanjr3351]

Re: 50 Hp Johnson -97, Powerloss and Oli warning

WOW...Weird! I was about to post about the EXACT same problem.
Its strange because I have the IDENTICAL motor and have done everything you have listed to try to solve the problem and have had the same results..
If I pump the ball everything is fine but if I quit I have about 10 seconds until it goes to idle then speeds up then dies.. I have everything new from the tank to the hoses and fittings, I have also cleaned the carbs and fuel pump which made it better but did not solve it. Also I know for sure my engine is not overheating.
Small World?

 

[tashasdaddy]

Re: 50 Hp Johnson -97, Powerloss and Oli warning

are you sure the vent is open on fuel tank. if it is squeezing the bulb, and it running good, points to fuel restriction, either carb float sticking or fuel pump.

 

[bugmanjr3351]

Re: 50 Hp Johnson -97, Powerloss and Oli warning

I have tried two different tanks and Yes both vents are open. I actually used the carbs I have on a different motor and they worked great. The fuel pump looks like new inside? I know that does not mean its good.

Could it be the engine hose that runs the fuel pump? Is there a valve inside the nipple on the engine where the hose comes out and hooks into the fuel pump?

Or maybe the supply line/sending unit from the oil tank?

Did'nt mean to HiJack your Post Leijon.

 

[bugmanjr3351]

Re: 50 Hp Johnson -97, Powerloss and Oli warning

I forgot to add I used the coil off of another working johnson and have had the same problem.
Also I have disconnected the tan Temp Sensor and same problem.

 

[Leijon]

Re: 50 Hp Johnson -97, Powerloss and Oli warning

I don?t mind the hijacking as it addresses the same issue.
As I yesterday had a word with a Johnson technician he asked if I had made sure that I got the air out of the VRO after repairing it. Reasons for this is, according to him, that if there is air left particularly in the oil pumping side the No-Oil alarm might be triggered. So yesterday I disconnected the carb hose from the VRO and stepped on the oil pump bowl until oil came out of the VRO. Have not had the time to find out I it helped.

Can anyone inform me on how the No-Oil and High-Temp alarms acts, besides the red light in the tach meter?

 

[tashasdaddy]

Re: 50 Hp Johnson -97, Powerloss and Oli warning

J/E Alarms

low oil alarm is a beep every 30 seconds. beep......................beep...................

no oil alarm is a beep every 1/2 second or so.beep,beep,beep

overheat alarm is a constant beep.beeeeeeeeeeeeeeeeeeeeeep

 

[Leijon]

Re: 50 Hp Johnson -97, Powerloss and Oli warning

Perfect.
Does any / al of these result in SLOW mode?
Can SLOW mode be overridden by squeezing the fuel bowl/bulb?

 

[tashasdaddy]

Re: 50 Hp Johnson -97, Powerloss and Oli warning

not ususally, that is controlled by the power pack.

 

[Leijon]

Re: 50 Hp Johnson -97, Powerloss and Oli warning

Ok, and does al of them trigger SLOW mode?

 

[bugmanjr3351]

Re: 50 Hp Johnson -97, Powerloss and Oli warning

I replaced the oil tank primer ball today. I tested the boat 2 different times for a total of about 3 hours and have had no issues. I ran in all RPM ranges from idle to WOT. I shut it off and restarted it several times. Everything seemed to work great. Im going for half a day tomorrow and will let you know if it continues working well. Hope that does the trick for you.

 

[Leijon]

Re: 50 Hp Johnson -97, Powerloss and Oli warning

Music to my ears.
Is the oil tank primer ball just an ordinary fuel primer ball or one especially for the oil distribution?

/ Leijon

 

[kjdunne]

Re: 50 Hp Johnson -97, Powerloss and Oli warning

Re: SLOW mode, it is triggered by the temp switch in the head. Disconnect the tan wire from the switch and ground the harness side with the key on. You should get a constant beep from the warning horn.

 

[bugmanjr3351]

Re: 50 Hp Johnson -97, Powerloss and Oli warning

The primer ball I had on my oil line had smaller nipples than a fuel ball. Even so I still used a fuel ball and its been working good.
Let me know your results Leijon and ill post back after my trip this afternoon.
Good Luck
David

 

[Leijon]

Re: 50 Hp Johnson -97, Powerloss and Oli warning

Re: SLOW mode, it is triggered by the temp switch in the head. Disconnect the tan wire from the switch and ground the harness side with the key on. You should get a constant beep from the warning horn

Yesterday I tried that maneuver and the Over Heating lamp went on but there were no alarm.
It?s kind of confusing. Last run I had with the boat a constant alarm went on. I hade to turn the ignition of in order to stop it. The engine went in to SLOW but the No Oil lamp went on. In my mind the No Oil alarm should sound like: Beep?.beep??beep? and so on. But it should not trigger SLOW mode. Right?

/ Leijon

 

[kjdunne]

Re: 50 Hp Johnson -97, Powerloss and Oli warning

No oil or low oil alarms should not trigger SLOW mode. If you had an overheat light on but no horn alarm, troubleshoot the horn and wiring.

 

[bugmanjr3351]

Re: 50 Hp Johnson -97, Powerloss and Oli warning

Leijon
I just wanted to let you know that my motor ran good today. I ran about 8 gallons through it. Idled for quit awhile and did alot of running around.
Seems like the oil primer ball was my problem.
Have you tried a new oil ball on your motor yet?
David

 

[Leijon]

Re: 50 Hp Johnson -97, Powerloss and Oli warning

Glad to hear that you seem to have solved your problem bugmanjr3351. As min also felt hot I decided to start out bay changing the impellor. I got a new ball though and will make a change later on.

Yesterday I lowered the gear case in order to change the impellor. Some if the things I saw made me wonder.

In pic E&F you can see that the rubber seal does not have a tight fit to the rod and further more the rod is not centered. It is situated aprox 1,5 mm to the front of the rigg.
Q1: Should the seal fit tight to the rod?
Q2: Is the ?off-center? some thing to worry about?

In pic D you can se how the Off-center made the rod grind into the cup in the pump house. The former circular hole is now aprox 1 mm wider in one direction. Unfortunately that direction leads to a decrease of the volume were water is sucked in and an increase of volume were water is compressed. I believe this reduces the pressure from the pump. In pic A at area 3 you can see how the cup also has grinded into the rod.
Q3: Is this common?
Q4: I need a new cup, right?

The rod is firmly fitted down in to the gear case without any wiggling. So I don?t think this has caused the grinding.
Q5: Could it be the entire pump housing that has bin fitted a fraction to far back on the rigg hat have caused the grinding?

In pic A, if you compare area 1 with area 2 you se a difference in color. My guess is that the gasket below the stainless steel plat has leaked in the areas that are white.
Q6: Would this matter at al?

I plan to replace al seals,gaskets and the impellor but I?d very much appreciate any answer to my Q?s.

Thanks
Leijon