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Old 10 January 2014, 04:52   #1
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Lower unit removal of L4NA mercury(80-115 4S EFI)?

Any trikky parts regardin shift linkage or is it just to open the 5(?) bolts and let it dropp?
Any gear position to preffere? This is not the Yam/Merc but Mercury own(free aspiration Verdado type).

Thanks
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Old 10 January 2014, 06:25   #2
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Drain engine oil out first or it will leak when gearbox removed.
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Old 10 January 2014, 08:40   #3
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really? are you sure? never drained an outboard gearbox yet to remove
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Old 10 January 2014, 08:59   #4
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You don't need to drain the gearbox oil you need to drain the engine oil. They are the same as the verados in that they leak engine oil out the driveshaft input in the powerhead if engine oil is not drained.
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Old 10 January 2014, 11:32   #5
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Quote:
Originally Posted by ring20johnson View Post
Drain engine oil out first or it will leak when gearbox removed.
Huh? How does the oil stay in when the LU is attached?

jky
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Old 10 January 2014, 12:09   #6
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Driveshaft seals it as it goes through seal into base of powerhead
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Old 10 January 2014, 13:20   #7
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The drive shaft seals everything off as it goes into base of powerhead.
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Old 10 January 2014, 14:44   #8
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Thank's for comments so far, interesting design re the drive shaft!

Can't see on the parts breakdown picture how the shift shaft is connected to LU, maybe just pushed into a bushing, but maybe it will all be clear when loosen the bolts first.

ww.boats.net/parts/search/Merc2/Mercury/80%20EFI%20%284-STROKE%29/1B366823%20%26%20Up/Gear%20Housing%2C%20Driveshaft/parts.html
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Old 10 January 2014, 14:51   #9
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Shift shaft is on a spline and therefore twists to selects gear. You don't need to do anything with it when removing the box. Just ensure it aligns correctly when re installing the box.
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Old 10 January 2014, 16:02   #10
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Quote:
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Shift shaft is on a spline and therefore twists to selects gear. You don't need to do anything with it when removing the box. Just ensure it aligns correctly when re installing the box.
Thanks a lot!
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