Reverse problem

[mu]

I have a 1970 evinrude 60073b 60 hp

I had some electrical problems replaced coil and power pack, spark plug and coil wires. So far that problem is solved good spark and compression.

The motor is switching gears no problem on the hose.

I then replaced the gear oil using type c. Its a push button electric type shifter. The oil that was in there was a light milky looking cream. Like a double cream coffee.

When I put the motor in the bucket and switch forward it works fine. When I put it into reverse it does not switch. If i rev the engine a bit it will go into gear and run in reverse fine until i back the throttle all the way down. After a few seconds it will just go back to neutral.

I am very frustrated at this point.

 

[mu]

Re: Reverse problem

.. ..

 

[Dhadley]

Re: Reverse problem

That is a hydro-electric gearcase, different than a straight electric shift unit. It is in forward by default and uses hudraulic pressure to shift into neutral and reverse. Make sure you used the correct oil, that's very important.

 

[mu]

Re: Reverse problem

I used type c oil

Today I tested the switch assembly and everything checks out except for the fact that when in reverse the blue and green wires don't have the same voltages.

half a volt difference

There is a place to disconnect the blue and green wire just before it enters the motor. I disconnected them and tested the voltage there too. 12.8 volts on both same as battery. (Switch and wires are good)

when i reconnect them I get 11.4 green 10.9 blue or the other way round can't remember now.

this is with the engine off.

neighbour is having birthday party. But it should not matter just testing electronics.

Im not sure what draws the load in the lower end What would cause one wire to draw more power?

or is it likely the root cause is mechanical.

Im not sure why it goes into gear when its revved up more voltage , higher oil pressure, What?

I dont know If want to take on rebuilding lower end with no experience.

Any troubleshooting I can try without dismantling the lower end where do I go from here.

 

[Daviet]

Re: Reverse problem

Higher RPM means higher pressure, is the engine idleing at the proper RPM?

 

[mu]

Re: Reverse problem

Higher RPM means higher pressure, is the engine idleing at the proper RPM?

I have a cdi replacement power pack without a tach function. So im not sure if its idling perfectly. The manual says to set the idle speed around 850 rpms in forward gear. I set the idle at a rate where its runs smooth and does not slam into forward too hard from neutral.

when i do throttle up to get it to lock into reverse gear its a little aggressive.

 

[Daviet]

Re: Reverse problem

In the day when we had a similar problem we would flush out the lower unit with ATF (dextron not ford ATF), even run it for a second through the gears to flush the pump and shift piston. There were even a couple of times that it worked.
Maybe worth a try, but at your own risk.