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Old 16-06-2018, 05:33   #1
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Question checking oil level in Yamaha outboard

I recently purchased a new Yamaha 2.5 hp outboard for my dinghy. It has a sight glass for viewing the engine oil level, but for the life of me I cannot determine what I'm supposed to be seeing through the sight glass to gauge the correct oil level. The user's manual is not helpful to me.

So my question is, if I use the dip stick that is attached to the filler tube cap to measure the oil level, should the dip stick be read after

a) Screwing the cap with the dip stick back in place?
b) Just inserting the cap with the dip stick until it rests on top of the threads?

Method (a) gives a reading that is about 1/2 inch higher than method (b).

I cannot find anything in the users manual about which method gives the right reading.

Thanks for any help.
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Old 16-06-2018, 06:35   #2
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Question checking oil level in Yamaha outboard

I have not seen anything with a screw in cap that you screwed it in to check oil level, from little Honda motorcycles as a kid, to Honda generators, Yanmar transmissions etc. They are all checked by not screwing in the cap.
Not saying your engine is different, but as bet itís not.
On motorcycles and turbine engines that have oil level sight glasses, usually half way up is the full level.
Book doesnít say on either?
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Old 16-06-2018, 07:02   #3
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Re: Question checking oil level in Yamaha outboard

The engine oil filler tube has a yellow plastic cap that screws into the tube. Integrated into the plastic cap is a short dip stick. Unfortunately the manual is silent as to how to get an accurate reading. Iíll try to get and post a photo.
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Old 16-06-2018, 07:23   #4
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Re: Question checking oil level in Yamaha outboard

Is this your motor?
If so page 19 and 20 show you how to check oil level
http://www.yamaha-motor.com/assets/s...07-04_1376.pdf
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Old 16-06-2018, 08:12   #5
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Re: Question checking oil level in Yamaha outboard

If it's a round sight glass, oil level should bisect the middle of the circle, i.e., 1/2 way up.
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Old 16-06-2018, 08:35   #6
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Re: Question checking oil level in Yamaha outboard

Visual check thru the sight glass.
1/2 to 3/4 of the sight glass, In the upright,not tilted position.
Yamaha dealer here.
Cheers,
SV Cloud Duster
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Old 16-06-2018, 08:55   #7
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Re: Question checking oil level in Yamaha outboard

Screw it in to check the level.
Page 37
https://cdn.yamaha-motor.eu/owner-ma...BVF819974E.PDF
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Old 16-06-2018, 09:08   #8
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Re: Question checking oil level in Yamaha outboard

Quote:
Originally Posted by Boatyarddog View Post
Visual check thru the sight glass.
1/2 to 3/4 of the sight glass, In the upright,not tilted position.
Yamaha dealer here.
Cheers,
SV Cloud Duster
Thank you, this is helpful but Iím still trying to understand why what I see doesnít match p.20 of the manual, which seems to show some kind of internal tilted disk supposedly visible through the sight glass that indicates the upper and lower oil levels.

I donít see the disk. Am I supposed to? Maybe Iím misreading the manual.

When I do measure the oil level via the dip stick (using the screw in approach) the oil level is perfect. (Between the upper and lower marks). But itís really hard to see the oil through the site glass. Maybe because the oil is very new and still very light in color.
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Old 16-06-2018, 09:15   #9
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Re: Question checking oil level in Yamaha outboard

Quote:
Originally Posted by merlinuxo View Post
Screw it in to check the level.

Page 37

https://cdn.yamaha-motor.eu/owner-ma...BVF819974E.PDF


It does seem to indicate screw it in to check level.
Interesting to me is the the window on the bigger engines isnít used to check level, just there to watch the oil splash around?
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