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Old 07-11-2023, 08:22   #1
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operating oil temperature of Yanmar SD60 saildrive

I am looking to fit a header tank onto my Yanmar SD60 saildrives so that I can run a header tank with transmission oil mounted up on the side of my engine bay so that as part of my engine check:
1. I can see the oil level with having to climb into my engine bay
2. With a clear header tank I can see if the oil is fine or milky due to a seal issue
3. If there is a problem it is far easier to top up the oil level this way.
4. It creates more room for oil expansion due to temperature variance which I believe will place less pressure on the sail drive seals.
5. It will save me some boat yoga
6. Make the admiral happy as I dont need to mess with the beds lifting the engine bay covers (which are on gas struts)
I would ideally like to use a clear hose for this (not the one in the photo!) that will withstand the temperature. Failing that, the hose must meet the required temperature rating of the oil under load.
I am looking to use a header tank similar to one used for brake fluid or clutch fluid. Any suggestions regarding the make and/or type of header tank to use would be appreciated. It will need a nipple of 9mm to take the hose from the filler cap

Does anyone know the operating temperature of the transmission oil so that I can buy the correct hose for this application.

I have a posted a photo of the filler cap that I managed to source.

All comments welcome
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Old 07-11-2023, 10:26   #2
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Re: operating oil temperature of Yanmar SD60 saildrive

When it is time to fill the saildrive with oil, how will that work? How with the air that is in the empty saildrive be escaping with just a single tiny oil tube going in?
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Old 07-11-2023, 10:36   #3
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Re: operating oil temperature of Yanmar SD60 saildrive

I found this somewhat dated description of someone doing something similar - maybe it's useful. Doesn't talk about oil temps though.

Sail Drives
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Old 07-11-2023, 10:43   #4
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Re: operating oil temperature of Yanmar SD60 saildrive

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Originally Posted by SailingHarmonie View Post
When it is time to fill the saildrive with oil, how will that work? How with the air that is in the empty saildrive be escaping with just a single tiny oil tube going in?
If it is a top up, the oil will still be in the pipe even though the header tank might be empty.
If it is after an oil change I will fill via the filler cap until full and then the rest from the header tank. I hope that answers your question.
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Old 07-11-2023, 19:32   #5
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Re: operating oil temperature of Yanmar SD60 saildrive

Immersed as the saidrive is in the seawater, I don't think it gets but so hot in the first place. Not like the final drive in a truck or car.

But don't try to put all the fill oil in thru the expansion tank! Would take too long for the air to works it's way up.
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Old 09-11-2023, 01:58   #6
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Re: operating oil temperature of Yanmar SD60 saildrive

The YANMAR SD60 Operation Manual* states [Page 8] “SAFETY. NOTICE. If the Sail-Drive oil temperature is too high, stop engine immediately”; but I didn’t see anywhere, where they specified a safe/unsafe [too high] operating temperature.

*https://www.yanmar.com/marine/wp-con...23_2018.05.pdf
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Old 10-11-2023, 19:50   #7
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Re: operating oil temperature of Yanmar SD60 saildrive

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Originally Posted by GordMay View Post
The YANMAR SD60 Operation Manual* states [Page 8] “SAFETY. NOTICE. If the Sail-Drive oil temperature is too high, stop engine immediately”; but I didn’t see anywhere, where they specified a safe/unsafe [too high] operating temperature.

*https://www.yanmar.com/marine/wp-con...23_2018.05.pdf
Thanks Gord ..... I always value your feedback ........ I have now heard bqck from a Yanmar service manager who said that most gearboxes operate at 20 - 40 degrees C

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Old 10-11-2023, 20:03   #8
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Re: operating oil temperature of Yanmar SD60 saildrive

Well, that's not very hot!

But he's saying just Yanmar "gear boxes". As in typical gearboxes not immersed in the sea water, but in the engine room? That would be different, I'd think.

While the top part of saildrives is in the hot engine room, more of it is being cooled in the sea.
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Old 10-11-2023, 20:12   #9
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Re: operating oil temperature of Yanmar SD60 saildrive

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Originally Posted by ggray View Post
Well, that's not very hot!

But he's saying just Yanmar "gear boxes". As in typical gearboxes not immersed in the sea water, but in the engine room? That would be different, I'd think.

While the top part of saildrives is in the hot engine room, more of it is being cooled in the sea.
Yes he was referring to saildrives ... That was my question. I was also pleasantly suprised by the information! I will test it from time to time with my laser thermometer to satisfy my curiosity

I do have powerful extractor fans in each engine bay that also help manage the temperature

I am sure the direct drive transmissions run hotter ..... and have noticed a higher temp on my direct drive Mastercraft Prostar transmission oil.
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