Are You Damaging Your Gearbox when Changing Gear?
Clutch Canine Gearboxes
Outboard motors and most stern drive gearboxes (like Mercruiser’s Alpha drives) use a Dog Clutch arrange for choosing and shifting gear.
If you choose gear slowly and careabsolutely with these gearboxes you will truly be damaging the gear box.
Do you hear a grinding or chattering noise when selecting either forward or reverse gear?
In the event you do, something needs to vary or sooner or later your decrease unit will not have any drive and it’ll continuously bounce out of gear.
Firstly I’ll explain how the lower unit/gearbox works.
They have an enter shaft that is pushed from the engine or ‘energy head’. (This enter shaft is called the driveshaft. The driveshaft has a gear connected to the underside of it called the Pinion gear. The pinion gear is always in constant mesh with the forward and reverse gears. When ever the motor is running, the pinion gear is rotating the forward and reverse gears. Between the forward and reverse gear there’s the mechanism that selects gear. This is called the Clutch Dog.
The Clutch Canine sits on the propeller shaft that protrudes out the back of the gearbox and drives the propeller. The Clutch Dog has an inside spline that is in constant mesh with the propeller shaft.
Image the Clutch Dog having a front and a back. At every end it has massive, sq. teeth. When you choose gear on the motor you move the Clutch Dog forwards and backwards alongside the propeller shaft.
When the Clutch Dog is moved to pick out gear it engages with the same sized square enamel on the particular gear that is being engaged.
Keep in mind that both of the output gears (forward and reverse) are rotating as they are in fixed mesh with the pinion gear (enter gear).
If you choose gear slowly, the Clutch Canine will slowly move into mesh with the gear. This slow movement causes the enamel of the gear to ‘skip’ over the enamel on the Clutch Dog. This continuous skipping wears away the great sharp edges of the teeth and will ultimately cause the motor to jump out of gear.
Easy methods to Choose Gear
· The way to avoid doing damage to your gearbox is to positively choose gear. This means to literally bang the engine into gear so that you hear one clean engagement of the gearbox, not chatter.
· You should also pause in impartial when shifting from forwards to reverse or vice versa. This permits the propeller time to stop spinning.
· Do not shift into reverse when you find yourself moving forwards quickly. It creates an enormous amount of pointless power on the gearbox (and engine). Slow the boat down of the plane, come back to an idle and pause in neutral to let the boat slow proper down. Reverse is only a reverse, not a break…
Engine Idle Velocity Too High
· Another cause for damage being completed to the Clutch Canine is your idle pace might be too high. In case you motor is idling higher than around 900rpm in neutral you can be doing damage each time you’re selecting gear.
So…
· Be sure that your idle velocity is ready to what the Manufacturer recommends!
· Positively choose gear
· Pause in impartial between gear changes.
· Let the boat gradual down before changing into reverse
· Have the gear oil modified every a hundred hours or yearly, which ever comes first.
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