Evinrude E-NATION, for those dedicated to water, power, fishing and fun
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Skipper
Posts: 5
Registered: ‎12-05-2019

Gear **bleep**ing in reverse

Have 2013 300hp etec. Goes in forward gear fine and runs fine but when I shift to reverse with a bit of throttle getting a tunking noise. Any ideas what causes this
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Captain
Posts: 40
Registered: ‎09-13-2011

Re: Gear **bleep**ing in reverse

Bigwave77,

 

Your problem may be that you are "shifting it in reverse" with a bit of THROTTLE...  PERIOD!

 

(I'm taking you literally at your word. ) NEVER shift into ANY gear... while almost instantaneously advancing the throttle! Especially, reverse. If that's what you're actually doing? Because in doing so... that speeds up the spinning drive gears & causes the clutch "dogs" (which are splined onto the propshaft) to have to... SLAM (or "thunk") into the mating dogs on the gear faces. Suffice it to say... if one does this routinely... you will cause the "dog" faces to become rounded rather than sharp. This will, over time, become severe enough that the motor will "thunk or clunk" worse & worse. Then, will eventually "grind" &  "jump" out of gear. Then not stay in engagement with the propshaft. Especially under loading ... in particular reverse!

 

It is highly advisable that when shifting gears... you pause in neutral for a brief moment while shifting from one direction to another. So that the propshaft can have time to slow down a bit before "shocking" it into an opposite direction! Causing hard & premature mechanical parts wear & failure!

 

Also, other factors like your prop and it's condition may have something to do with the noise. In addition to the mechanical condition of the gears / clutch & bearings that make up the transmission. There are other things that may come into play like hull materials, transom condition and more.

Best regards,
Lakerider
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Admiral
Posts: 8,624
Registered: ‎07-14-2011

Re: Gear **bleep**ing in reverse


@Bigwave77 wrote:
Have 2013 300hp etec. Goes in forward gear fine and runs fine but when I shift to reverse with a bit of throttle getting a tunking noise. Any ideas what causes this

The motor may have the shift shaft or the linkage and shift cable misadjusted which is not allowing it to shift fully into reverse.  The shift shaft could also have corrosion buildup on it which could restrict it from moving fully into reverse.

 

Do not run the motor until the problem is corrected as each "thunk" is metal on metal wear and resulting in more fragments getting into the gear oil.

 

 

 


"There is never just one thing wrong with a boat";
                    -- Travis McGee, main character in a book series by John D. McDonald 


 



***************

The factory recommends that a properly trained technician service your Johnson or Evinrude outboard motor. Should you elect to perform repairs yourself, use caution, common sense, and observe safety procedures in the vicinity of flammable liquids, around moving parts, near high-temperature components, and working with electrical or ignition systems.

The information offered here is only general in nature and should not be construed as complete factory approved procedures, techniques, or specifications. Always use the proper service manual for your motor, up-to-date service literature, the correct tools, and have an understanding of how to proceed with troubleshooting and repair methods. If you are unsure or uncomfortable with a procedure, a situation, or a technique, enlist the services of a factory trained technician.


Highlighted
Skipper
Posts: 5
Registered: ‎12-05-2019

Re: Gear **bleep**ing in reverse

Tks.  Is there a procedure for adjusting shift cable/linkage?

Highlighted
Skipper
Posts: 5
Registered: ‎12-05-2019

Re: Gear **bleep**ing in reverse

Goes into reverse fine but when I give engine more power I get the clucking.  In saying that it doesn't always happen

 

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Captain
Posts: 715
Registered: ‎08-20-2017

Re: Gear **bleep**ing in reverse

The fears are not fully engaging in reverse and the clutch slips under load. Check the feel on your shifter for shift balance ( such as from neutral the shifter should move the same distance to lock in each gear). If forward comes in quick and reverse late then the shift cable needs to be adjusted at the engine where the cable clamps.
Highlighted
Admiral
Posts: 8,624
Registered: ‎07-14-2011

Re: Gear **bleep**ing in reverse


@Bigwave77 wrote:

Tks.  Is there a procedure for adjusting shift cable/linkage?


There are  2 critical shifting adjustments. The first is the shift rod height and that requires the gearcase be removed for measuring it. That one has to be done first. 

 

The second adjustment is the shift cable and that consists of centering the cable throw in neutral and making sure N to F and N to R have the same through.

The factory service manual gives the procedures and the specs.

 

Be sure all linkage operates smoothly and easily with no stiffness or binding.

 

 

 


"There is never just one thing wrong with a boat";
                    -- Travis McGee, main character in a book series by John D. McDonald 


 



***************

The factory recommends that a properly trained technician service your Johnson or Evinrude outboard motor. Should you elect to perform repairs yourself, use caution, common sense, and observe safety procedures in the vicinity of flammable liquids, around moving parts, near high-temperature components, and working with electrical or ignition systems.

The information offered here is only general in nature and should not be construed as complete factory approved procedures, techniques, or specifications. Always use the proper service manual for your motor, up-to-date service literature, the correct tools, and have an understanding of how to proceed with troubleshooting and repair methods. If you are unsure or uncomfortable with a procedure, a situation, or a technique, enlist the services of a factory trained technician.