Another Shift interrupter question

[Augoose]

Re: Another Shift interrupter question

The switch should ONLY WORK coming OUT of gear.If it activates going into gear you need a lower cable .

What is actually occurring or failing with the cable to make the switch activate going into gear? Is there too much friction which causes the cable sheath to move? I watched the switch and cable over and over today while putting the boat in and out of gear, trying to figure out what is happening vs what shouldn't be happening, but I don't know what to look for.

Thanks

 

[Bt Doctur]

Re: Another Shift interrupter question

that will be determined when you pull the drive off and look.
Some factors:
a overheated engine melted the cable where is passes close to the exaust tube
water entry into the shift cable pocket causing corrosion inside the cable
bent shift shaft or "C" link in the lower unit
corrosion on the vert shaft you see in the exaust port.

 

[Augoose]

Re: Another Shift interrupter question

that will be determined when you pull the drive off and look.
Some factors:
a overheated engine melted the cable where is passes close to the exaust tube
water entry into the shift cable pocket causing corrosion inside the cable
bent shift shaft or "C" link in the lower unit
corrosion on the vert shaft you see in the exaust port.

What I mean was, when you look at the cable and shift interrupter switch, what are you looking for to know when something is wrong? What physically happens? Does the shift cable not retract all the way? does it not move to begin with? I know I probably need to replace the cable but I just want to know what to look for vs just knowing that if the engine stalls going into gear that automatically means you need a new cable.

 

[achris]

Re: Another Shift interrupter question

Am I right in assuming you would like to know the 'theory of operation' of the interrupter switch and how it all ties in with gear shifting?

If so, click HERE....

Chris..........

 

[Bt Doctur]

Re: Another Shift interrupter question

I`ll try:
Start the motor and have someone try to shift while you watch the plate. If the arm moves while going into gear and the motor stalls ,it`s a sign the cable is binding up . The switch SHOULD NOT OPERATE AT ALL on land (in or out of gear)because there is no torque in the prop.In the water the switch should operate COMING OUT OF GEAR ONLY for just a split second. The momentary stall unloads the gear dogs and allows them to slip out of gear.
page 2A-9 this link
http://www.boatfix.com/merc/Techbk/94/94hsa2.pdf

 

[Augoose]

Re: Another Shift interrupter question

I`ll try:
Start the motor and have someone try to shift while you watch the plate. If the arm moves while going into gear and the motor stalls ,it`s a sign the cable is binding up . The switch SHOULD NOT OPERATE AT ALL on land (in or out of gear)because there is no torque in the prop.In the water the switch should operate COMING OUT OF GEAR ONLY for just a split second. The momentary stall unloads the gear dogs and allows them to slip out of gear.
page 2A-9 this link
http://www.boatfix.com/merc/Techbk/94/94hsa2.pdf

Thanks for the info. I did read the sticky before starting this thread, but I just didn't understand what the motion of the switch, rocker, and roller was supposed to be, but I do understand the concept and the purpose of the switch. I removed the cable, measured and adjusted it to the 6" of length that the manual calls for, and it did seem to make an improvement today. I only stalled going into neutral about 2 out of 10 times- heck of an improvement over yesterday.

When I shift from forward to reverse on land, the roller in the switch rocks from one side to the other, then settles back in neutral when the shifter is in neutral. Does it move differently when the boat is in the water and there is resistance on the drive? Should the roller on the switch stay in the center as the boat is placed from neutral to drive and then only come out of center for a split second as the boat is put back in neutral?

If that is the case, what effect is the cable having on the switch when going back into neutral? Does it cause the roller of the switch to linger outside of center for too long?

Thanks again for the help!

 

[Bt Doctur]

Re: Another Shift interrupter question

I`ll try it again:
ON LAND, THE SWITCH DOES NOT MOVE AT ALL,IF IT DOES YOU NEED A NEW LOWER SHIFT CABLE.!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

 

[achris]

Re: Another Shift interrupter question

On muffs I have often seen the switch arm move (but not enough to kill the engine) just as the dogs engage, particularly if you go from forward to reverse (or reverse to forward) with the prop still spinning.

On land (with muffs) you should not have the engine stall at all. If you have, then replace the lower shift cable. No amount of adjustment will cure it...

Chris......

 

[Augoose]

Re: Another Shift interrupter question

On muffs I have often seen the switch arm move (but not enough to kill the engine) just as the dogs engage, particularly if you got from forward to reverse (or reverse to forward) with the prop still spinning.

On land (with muffs) you should not have the engine stall at all. If you have, then replace the lower shift cable. No amount of adjustment with cure it...

Chris......

Thanks Chris