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Old 03 June 2015, 17:05   #1
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Mariner 30hp 1992 gearbox jumping

Hi all, I'm at the end of my tether with a silly problem (ebay engine). I've got a nice clean yam made mariner (689 series) anyway, the original problem was it was jumping out of forward gear on minimal power, so I reset the remotes and tried again. Better but still jumping out of forward gear. More research and I thought it could be the clutch dog so stripped the gearbox and the clutch and gear had a slight rounding off the lead edge, I took it to the guys at ribs marine who said it didn't need replacing. So rebuild the gearbox and tested and all seems ok. Well, tried it tonight and same problem is there. I have increase the length of the gear shifter linkage (2 part) to the maximum I can get away with. The problem is better but its still jumping out of gear on throttle up and I have no more adjustment left. What am I missing? One thing I can't remember seeing though is the slide spring (no.37) when I did the strip out and rebuild.
30A Mariner Outboard 689-105325 THRU 689-530100 (ML) GEARHOUSING Diagram and Parts

cheers Joe
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Old 04 June 2015, 18:52   #2
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I've been looking at the parts list and if I remember the clutch dog is/was on back to front with the f marking facing the reverse gear. Are the gears cut differently?
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Old 04 June 2015, 19:13   #3
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I'm no expert but from the sound of things it's possible someone swapped the clutch dog over to get a bit more life out of it as reverse rarely fails
Sometimes difficult to see with the eye wear on gears & they can look ok but actually worn enough to jump out
Obviously if there is a spring missing then that could be your problem
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Old 05 June 2015, 00:40   #4
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#37 is only in some engines. First check the spring pushes the clutch dog cross pin fully home to the end of the slot in the propshaft. If it doesn't I would suggest somebody has lost #37.
Making the shift shaft longer will make it jump out of forward gear you want to be shortening it to lift the shifter higher letting it further into forward gear.
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Old 05 June 2015, 11:19   #5
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Cheers Davie, more work me thinks
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Old 05 June 2015, 20:12   #6
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Fwiw I had the same problem with a 72 vintage Johnson.

Cured with a new(er!) Dog & gears.
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Old 06 June 2015, 01:40   #7
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Joe I probably have a complete long shaft gearbox spare, definatly got at least two short shaft boxes spare if not more.
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Old 07 June 2015, 13:57   #8
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hmmmm, whats the damage?
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Old 07 June 2015, 14:16   #9
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Quote:
Originally Posted by 9D280 View Post
Fwiw I had the same problem with a 72 vintage Johnson.

Cured with a new(er!) Dog & gears.
Thats the back up plan if I can't sort a spare unit
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Old 13 June 2015, 15:11   #10
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Good news, stripped the box beside the river today, swapped the dog around and bingo, problem sorted. Going to do some higher speed trials mo
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