gear oil

OnTheWaterNow

Petty Officer 1st Class
Joined
Mar 18, 2009
Messages
210
Hey guys, I have a question Im changing lower end gear oil.I tilted motor up removed fill plug inspected it clean no metal removed vent plug. oil drained lowered motor let a little bit more out quit draining oil looked good clean no water no metal just didnt seem like there was much that came out. went to marine shop 5 min from house took bucket of oil with me.Asked them if it seemed like it was proper amount that came out.He said no told me to take 2 32 ounce bottles it will take one and a little out of the other bottle.Came home had motor in operating postion put pump hose in fill tube pumped it in stared to run out vent hole put fill plug back with new washer put vent plug back with new waser, looked at bottle on side where there is viewable ounce chart said there was 20 ounce left in bottle. so in my mind that would mean if it was a 32 ounce bottle and i had 20 ounce left after the fill i used 12 ounce correct? That is a huge difference from 32 plus ounce the mechanic told me they are a new shop that opened up about a year ago i get parts from them cus they are close a professinal football player from the cheifs not sure of name and a local guy here are supposed to be the owners and they have all young kids there cant be much over 24v 25 years of age just never felt good about what they tell me probably will just stop using them all togther now if it turns out all the gearcase holds is around 12 ounces the motor is 1994 mariner 50 hp 2 stroke 3 cylinder (not big foot) does this sound like that is enough oil any one know thanks for listening and any help
 

dingbat

Supreme Mariner
Joined
Nov 20, 2001
Messages
16,332
Re: gear oil

Did you remove the top plug as well. Needs to be open to vent the system while draining
 

OnTheWaterNow

Petty Officer 1st Class
Joined
Mar 18, 2009
Messages
210
Re: gear oil

yes i described in detail how i did it in the post does it seem correct to you i just want to know how much it should hold i got 12 ounces in then it started to overflow the top vent hole thanks
 

Lion hunter

Lieutenant Commander
Joined
Apr 9, 2005
Messages
1,529
Re: gear oil

It may have got a vacuum when you drained and you didn't get it all out, or there may be a plug of gunk in it. I don't know that motor but would think a 50hp would take 25-30 ounces. Most small motors are 12-16 oz. Do you have a manual? There should be a capacity sheet in it. Also, instead of asking the shop how much to buy ask them to look up the capacity. They way you did it is correct if you used the bottom hole for drain/fill and the top for vent.
 

OnTheWaterNow

Petty Officer 1st Class
Joined
Mar 18, 2009
Messages
210
Re: gear oil

I just found it online it holds 12 ounce so i must have got it right because there was 20 ounce left in bottle after the fill thanks for reply
 
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