Boat Repair Questions? Ask a Marine Mechanic for Answers ASAP
the problem definitely feels, in the control box. The throttles are both locked together, there is not even enough play to engage a stuck shifter on one of the motors. The throttles feel like they are locked together in the control box, if that makes sense.
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yes sir, I am looking for answers linked to the control box, not the engine. Both of my engines did not suddenly have shifting problems, or both shifting cables fail. I am looking for issues with the 704 binnacle control box
The issue you have here is either the engine is he problem or the control box is the problem. So disconnecting the cables from the engine separates the 2. This will tell us if the engines are the issue or the control cables are bad or the control box is the problem. This is a process of elimination. How do you know the engines are not the issue if you haven't disconnected the control cables and shifted the engine manually?
If the engines are ok then that leaves the cables or the box. The cables can be replaced. The control box will have to be removed and inspected for cause of the issue. Now most of the time the cables are the issue. Stiff cables will cause binding and shift issues. Now the engine can cause stiff shifting and shift issues also. So you must disconnect the control cables to narrow down the issue. As you can see thee are allot of parts in the control.
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Update: removed cables from engine, no change. After more inspection of the control, I was able to seperate the movement of the throttle levers on the control box and get the control to move the shift cables and shift the engine, but very stiff. The throttle cable moves very freely on both throttles, the shift cables moves VERY stiff, with or without the cables connected to the engines. So this narrows the problem to the shift cables or the control box. Thoughts: I would not suspect the shift cables, especially that both of them would be so stiff, when the throttle cables, especially that both of them move so freely, no corrosion evident anywhere. Leading me to suspect the control box.
can I remove the throttle frictions screws completely and try to lubricate inside the control box?
How do I remove the cables from the control box to seperate the problem, from the cables versus the control box
Can I lubricate the control box without tearing it down?
Where can I find instructions to service the control box/cables, my service/shop manual does not cover the control box
There is no service manual on the control box. As for the shift cables they are a wear and tear item. Just because the throttle cables are free it doesn't mean the shift isn't bad. They wear differently and have different forces applied during use. I fail to see how the throttle friction screws will help the shift. The control boxes must be split apart once split just remove the retainer holding the cables in place. There is a e clip holding the end of the cable. Once you have the cables disconnected check there movement, if they move smoothly then the boxes are the issue. As for cleaning and lubricating I have never attempted to repair one of these boxes for liability reasons. Lubrication isn't usually the issue but worn parts. To many moving parts that can be reassembled wrong and liability. When the control box starts acting up it is time to replace. The issue is if you have worn or failing parts and the box fails to disengage or sticks in one particular position it can be very hazardous to operate the boat and cause bodily injury. I suggest replacing the control if it is the issue so no one gets hurt.
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