Shift interrupt problems

[dozerII]

1981 Mercruiser 140 . In an earlier post after changing the shift cable gimbal bearing and bellows I was having trouble engaging reverse. I followed Achris's video instructions to a T and got reverse, it did take almost full travel in the slotted hole to attain this. At that time it was suggested that there may be a lot of wear in the shift dogs.
We finally got the boat on the water and the timing and carb adjusted only to have the motor die as soon as it was put into reverse and throttle was applied, I tried a couple more times with the same outcome. I then had the owner of the boat put it in gear as I watched the shift interrupt, it seems as we went into gear and applied throttle the Y would be pulled and held by the throttle stalling the motor, if we were careful it would stay running with just going into gear but die with even a little throttle. I ended up disconnecting the ground on the switch and everything worked fine including coming out of either forward or reverse with an idle of about 600 rpm. Any ideas on this problem.

Now the second part of the problem after running the boat it was determined the motor is pooched from detonation caused by water intrusion. I have a new 3.0 liter coming for it from Michigan Motorz with the updated flywheel and coupller as well as the intake exhaust manifold adapter, it also comes with a Delco EST dist ignition system. I printed the pdf instructions for this system and it says to rewire the shift interrupt system from a grounding one to a 12v positive, how are the problems in this system going to effect the Delco?

Any advice would be much appreciated.

 

[alldodge]

1981 Mercruiser 140 . In an earlier post after changing the shift cable gimbal bearing and bellows I was having trouble engaging reverse. I followed Achris's video instructions to a T and got reverse, it did take almost full travel in the slotted hole to attain this. At that time it was suggested that there may be a lot of wear in the shift dogs.
We finally got the boat on the water and the timing and carb adjusted only to have the motor die as soon as it was put into reverse and throttle was applied, I tried a couple more times with the same outcome. I then had the owner of the boat put it in gear as I watched the shift interrupt, it seems as we went into gear and applied throttle the Y would be pulled and held by the throttle stalling the motor, if we were careful it would stay running with just going into gear but die with even a little throttle. I ended up disconnecting the ground on the switch and everything worked fine including coming out of either forward or reverse with an idle of about 600 rpm. Any ideas on this problem.

IMO you need to start over and try the adjustment procedure again. It should not take that much to get it in/out. How does Forward work?

Now the second part of the problem after running the boat it was determined the motor is pooched from detonation caused by water intrusion. I have a new 3.0 liter coming for it from Michigan Motorz with the updated flywheel and coupller as well as the intake exhaust manifold adapter, it also comes with a Delco EST dist ignition system. I printed the pdf instructions for this system and it says to rewire the shift interrupt system from a grounding one to a 12v positive, how are the problems in this system going to effect the Delco?

Any advice would be much appreciated.

The Delco uses the same method to interrupt the ignition

 

[dozerII]

Thanks AllDodge, to be honest I'm not sure if it worked in forward cuz I didn't get the boat off the trailer till after I unhooked the ground on the switch, the boat was on the trailer backed into the lake while I was tuning.

The wiring diagram to poset is different that the one I printed off the net. it and the instructions are from 1992.

 

[wrench 3]

The problem with the interrupter switch is probably from not having it all the way into gear when adjusting the cable. Most control boxes aren't all the way into gear at idle. It's best to make the adjustments at full throttle .

 

[dozerII]

The problem with the interrupter switch is probably from not having it all the way into gear when adjusting the cable. Most control boxes aren't all the way into gear at idle. It's best to make the adjustments at full throttle .

Thanks wrench once we get the new motor installed I will go over the adjustments again.

 

[alldodge]

Thanks AllDodge, to be honest I'm not sure if it worked in forward cuz I didn't get the boat off the trailer till after I unhooked the ground on the switch, the boat was on the trailer backed into the lake while I was tuning.

The wiring diagram to poset is different that the one I printed off the net. it and the instructions are from 1992.

Wiring is the same mine is just more simplistic, color of wires are the same. The jumper wires shown are only for timing purposes

 

[dozerII]

Thanks AllDodge, I will attack that once the new motor is in.