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Old 09 July 2008, 12:04   #1
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gear oil?

i have a mariner 30, is the gearbox oil sae 90 or something else, also i am assuming the screw just above the skeg is the drain plug and the one just below the cavitation plate the filler hole, once drained do i fill up to the level of the filler plug?
thanks for any advice,
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Old 09 July 2008, 12:12   #2
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Horrible job, so arm yourself with cloths, drip tray and some disposable gloves cos it's going to go everywhere.

Take the two screws out and drain the oil. Clean the magnet on the inside of the screws of any swarf. Dealers will use a pump but at home you will need probably 3 tubes of gear oil. Cut the tops off each tube ready for action. Squirt the first tube into the lower hole and then without it running out again quickly put the next tube in and continue filling the box up from the lower drain hole. When oil runs out of the top hole its full and more importantly you have avoided trapping air pockets inside.

Pete
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Old 09 July 2008, 12:17   #3
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cheers pete is it standard sae 90 though? i have half a gallon in the shed and a tool for pushing oil in - like a grease gun but for oil,
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Old 09 July 2008, 12:24   #4
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Yes but No But
Mmmm Just taken a tube off the shop shelf and it reads
"Contains Improved emulsifiers to help protect gears should water enter the Gear housing, Tackifiers to improve the oil film adhesion to gears and internal components, Extreme pressur additives to protect gears from metal to metal contact and excessive wear "
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Old 09 July 2008, 12:28   #5
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Hi,
I found this quite useful:
http://www.themarinedoctor.com/gearoilmovie.wmv

Orve.
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Old 09 July 2008, 12:50   #6
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Originally Posted by ashbypower View Post
Yes but No But
Mmmm Just taken a tube off the shop shelf and it reads
"Contains Improved emulsifiers to help protect gears should water enter the Gear housing, Tackifiers to improve the oil film adhesion to gears and internal components, Extreme pressur additives to protect gears from metal to metal contact and excessive wear "
Exactly why you shouldn't use normal EP90. The proper stuff will protect your box even if you get a bit of water ingress.
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Old 09 July 2008, 14:07   #7
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what is the third drain plug for- slightly higher than the oil filler and to the left a bit?
the oil is draining, looks more like semi-fluid grease than oil though, no signs of swarf or water in it though,
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Old 09 July 2008, 14:35   #8
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The third hole is probably a fitting for a flushing attachment. The smaller mariners have in the past used a small brass fitting which a hose fits onto. I had one, it was silly. The ear muff style flusher is way easier.
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Old 09 July 2008, 16:08   #9
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Quote:
Originally Posted by ashbypower View Post
Yes but No But
Mmmm Just taken a tube off the shop shelf and it reads
"Contains Improved emulsifiers to help protect gears should water enter the Gear housing, Tackifiers to improve the oil film adhesion to gears and internal components, Extreme pressur additives to protect gears from metal to metal contact and excessive wear "
They all do that!!!

Many racers use synthetic gear oil which is sold for car applications. Remember LR diffs and gearboxes get plenty of water in them as well..........

Morris lubricants sell some good gear oils - I asked their tech dept if they were suitable for outboards and was told "no problem"!!!
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Old 09 July 2008, 17:03   #10
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Originally Posted by codprawn View Post
They all do that!!!

Many racers use synthetic gear oil which is sold for car applications. Remember LR diffs and gearboxes get plenty of water in them as well..........

Morris lubricants sell some good gear oils - I asked their tech dept if they were suitable for outboards and was told "no problem"!!!
How much do I have to bet that they haven't tested their gear oils for protection against damage due to standing for long periods with contamination with salt water?
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