If you can see the long thin shift rod (#9 in GordMay's diagram) move up and down in response to the shift lever- then most likely you have a problem down inside the lower unit.
I had a motor
that would not shift out of forward. After taking off the lower unit I noticed that the shift rod had a plastic wedge on the end that forced two opposing camplates apart. As you shifted from forward to neutral the cam plates separated enough to disengage the drive shaft from the lower unit gear
. Shifting to reverse caused the cam plates to separate wide enough to engage the drive shaft with the reverse gear. The adjustment of the plastic wedge was critical to allow the gears to meet. Damage to the plastic wedge or its attachment to the shift rod would cause the drive shaft to stay engaged in the nominal fwd or reverse gear.
- - You are going to have to remove the lower unit. But when you do it - look carefully at how the exhaust
systems connects with the lower unit passes to the exhaut through the propeller
. There are gaskets or rubber spacers that must me carefully aligned during re-assembly. Looking carefully at how the parts
align during dis-assembly makes it easier when trying to put everything back together again.
- - Also the water pump
for the cooling water
is sometimes down there at the junction between the lower unit and the main body. Again seals
and how the pipes align should be carefully noted during dis-assembly so you can remember how to put it back together again.