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Old 23-04-2015, 18:34   #1
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Why fill gear case from bottom

Folks,

Why do you need to fill the gear case oil from the bottom hole (yamaha)? It makes an awful mess and you end up leaking out some of the oil....

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Old 23-04-2015, 18:38   #2
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Re: Why fill gear case from bottom

Yamaha 2 stroke outboard I assume.

To purge the air. The holes are so small you cant fill from the top fast enough and cold gear oil is very viscous.

I use a 1 quart plastic bottle with a pvc tube and tapered plug. Works a treat. No mess no fuss. Having the oil nice and warm helps too.

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Old 23-04-2015, 18:40   #3
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Re: Why fill gear case from bottom

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Originally Posted by leftbrainstuff View Post
Yamaha 2 stroke outboard I assume.

To purge the air. The holes are so small you cant fill from the top fast enough and cold gear oil is very viscous.

I use a 1 quart plastic bottle with a pvc tube and tapered plug. Works a treat. No mess no fuss. Having the oil nice and warm helps too.

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Yes, we use the recommended yamaha pump assembly but you still need to take the pump out and put in the plug, during which some oil leaks out.
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Old 03-05-2015, 11:01   #4
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Re: Why fill gear case from bottom

The oil is so thick it will trap air in the case and not be full. You fill from the bottom til it squirts ou the top. If you put the top plug back in before pulling the pump off, that will airlock the case and very little will come out the bottom hole. Or you can turn the motor on its side or almost upside-down before disconnecting. That might not be good for a 4 stroke, but a 2 stroke won't care.
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Old 03-05-2015, 15:35   #5
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Re: Why fill gear case from bottom

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Originally Posted by capt jgw View Post
............. If you put the top plug back in before pulling the pump off, that will airlock the case and very little will come out the bottom hole. Or you can turn the motor on its side or almost upside-down before disconnecting.
Of course.
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Old 03-05-2015, 16:40   #6
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Re: Why fill gear case from bottom

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Yes, we use the recommended yamaha pump assembly but you still need to take the pump out and put in the plug, during which some oil leaks out.

After your sure it's full, put the plug in the top BEFORE you remove the hose from the bottom, you'' be surprised at how little leaks out that way.


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Old 04-05-2015, 07:51   #7
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Re: Why fill gear case from bottom

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Originally Posted by a64pilot View Post
After your sure it's full, put the plug in the top BEFORE you remove the hose from the bottom, you'' be surprised at how little leaks out that way.


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Yes, that is what we do.
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