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SUZUKI DF350 Gear Oil Change

Old 07-11-2019, 05:54 AM
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Default SUZUKI DF350 Gear Oil Change

I have a Suzuki DF350 with 300 hours on it. For the first 3 services, 20, 100 & 200 hours, I had a mechanic perform the work. I did some research and noticed the 100 hour services are relatively simple. The oil change portion was no problem. But when i drained the gear oil i noticed an entire gallon of "oil" came out when the recommended level is 3.2L. The oil looked like oil to me light blue-dark blue. Maybe the mechanic just used an excessive amount. Any cause for concern here?
Old 07-11-2019, 07:24 AM
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No concern, its nearly a gallon of gear oil that is used. It is very very important to fill the gearcase properly and completely. There is a certain procedure to do it on the 350 suzuki's.

Gear Oil Changing Procedure
Change the gear oil after the initial 20 hours of operation
(1 month), and every 100 hours (12 months)
thereafter.
1) Place the engine on a level surface.
2) Center the steering, and raise the engine to its
full trim-up position.
3) Place a container under the lower unit.
4) Remove the lower gear oil drain plug (1) first,
then remove the rear gear oil level plug (2),
and drain the gear oil.
NOTE:
The oil drain/level plugs are magnetic – be sure to
clean them so they are free of any debris.

5) Using trim-up and a digital angle meter, elevate
the engine 4 degrees from horizontal (3).
6) Fill the lower unit with the recommended gear oil
through the oil drain hole until oil starts to flow
out from the rear gear oil level hole.
Recommended Gear Oil
Suzuki Outboard Motor Gear Oil or API
classification GL-5, viscosity rating SAE #90
hypoid gear oil.
Gear Oil Volume
Approx. 3.2 L (3.4/2.8 US/Imp qt)
NOTE:
If the engine is positioned correctly as described
above, the lower unit should contain 3.2 L of gear oil.
7) Install the rear oil level plug before removing
the oil filler tube from the drain hole.
8) Install the oil drain plug.
NOTICE
A used gasket may leak and allow water to enter
the gearcase, causing severe damage.
Do not re-use gaskets once they are removed from
the engine. Always use new gaskets.
NOTE:
To prevent a low level of gear oil, keep the engine in
the 4-degrees trim-up position for 10 minutes after
installing the oil drain plug. If the gear oil level is sill
low, add more gear oil until the level is correct
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Old 07-11-2019, 07:45 AM
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Yes, i downloaded the latest bulletin for the service and have all new gaskets. It was actually slightly more than a gallon that was removed from the case. Again it didn't look like water got in. But i am not quite an expert as I am sure you can tell. If water got in would it be very apparent? I emptied the fluid into a clear jug and the oil looks fairly consistent, slightly milky at the bottom, as you can see fairly consistent and it filled to the very top! I wasn't expecting to nearly over flow the gallon jug.

Old 07-11-2019, 10:50 AM
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The oil coming out looks nice and green so you should be all set, nothing to worry about. As far as the level goes, don't worry about that either, just fill properly. Since no water you are fine.
Old 07-11-2019, 11:28 AM
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Hey man big thanks for the advice and taking some time to help me rest easy. This is some expensive equipment and i want to be sure i'm not trashing it trying to save a buck. I will get off my wallet for the 200hr.
Old 10-20-2019, 06:16 AM
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Both my 350 lower unit looks different than this at the 100 hour. Both mine are very black. Is that an issue?
Old 10-21-2019, 04:28 AM
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Originally Posted by datlhookYa View Post
Both my 350 lower unit looks different than this at the 100 hour. Both mine are very black. Is that an issue?
Black is OK, just old. Maybe more then 100hrs on it? As long as it is not milky looking which indicates water.
Old 10-23-2019, 04:32 PM
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Originally Posted by Outboard Specialties View Post
Black is OK, just old. Maybe more then 100hrs on it? As long as it is not milky looking which indicates water.
Mine was kind of black at 20 hours and 1 month use. Very black at 100 hours and 6 months of use. I then got the seal issue, twice. Shoould I be worried long term?
Old 10-24-2019, 04:13 AM
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Originally Posted by Brocnizer1 View Post
Mine was kind of black at 20 hours and 1 month use. Very black at 100 hours and 6 months of use. I then got the seal issue, twice. Shoould I be worried long term?
As long as the seal failure(water intrusion) didn't leave any rust internally, it'll be fine long term. Even if minor service rust was seen I wouldn't worry about it.
What gear oil are you using? Many guys will use the yamalube because it may be easier to get but the lesser yamalube will not work on the suzuki's. You must use the HD yamalube which has the equivalent rating of suzuki gear oil.
Old 12-10-2019, 05:36 PM
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I can’t keep water out of my df350 owners. 150hrs. Dealer made a part change that was suppose to fix the issue. Didn’t. Got worse.
Old 12-11-2019, 04:32 AM
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Originally Posted by Archer22 View Post
I can’t keep water out of my df350 owners. 150hrs. Dealer made a part change that was suppose to fix the issue. Didn’t. Got worse.
I hate to say it but bring it back again for a pressure check and new seals again if needed, maybe the updated seals were not installed. Also the whole driveshaft seal assy cap should be changed as well, suzuki takes care of this no problem under warranty. Need to confirm that that is the seal leaking as well and nothing else is.
Old 12-28-2019, 03:43 AM
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I checked both LU oils yesterday and water came out of both units. I am assuming that all the updates have been done on the motors/seals so I was wondering if you have any ideas.

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