Author Topic: Dry Sump??  (Read 394 times)

Online jack d

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Dry Sump??
« on: August 12, 2017, 02:47:31 pm »
I have seen the Tenere engine referred to as a dry sump engine on this forum. I see no separate oil tank, no oil in  the frame, no sump extension below the engine and there does not seem to be a scavenge oil pump to return oil to the sump. It looks like every other engine that has a wet sump. Is there something I am missing?

Offline magic

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Re: Dry Sump??
« Reply #1 on: August 12, 2017, 03:26:14 pm »
The oil tank is built into the crankcase. Hence the need for 2 drain plugs as the oil pan is divided into 2 reservoirs. This design only uses 1 oil pump. You're not missing anything, take a look at an exploded view of the engine it will all make sense. Rocky Mountain ATV has exploded views in their OEM parts section. Checking your oil level can be somewhat interesting as the level in the sight glass seems to change, but don't worry about it too much. Just dump in the 3.6 quarts or so when you change oil and forget about it. I check mine according to the owner's manual and have not seen any oil consumption yet.

Offline EricV

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Re: Dry Sump??
« Reply #2 on: August 12, 2017, 03:35:44 pm »
@magic - Very nice explanation.   ::008::  you nailed it.
Matte Black 2015 Super Tenere
Rumbux Adventure Products Importer
Eval Innovations Inc.

Online jack d

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Re: Dry Sump??
« Reply #3 on: August 12, 2017, 04:57:51 pm »
Thanks for the explanation however I am familiar with this type of design and have no problems with my bike. I was curious as to why people refer to this as a dry sump when it is not.

Offline Sierra1

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Re: Dry Sump??
« Reply #4 on: August 12, 2017, 05:28:39 pm »
My tech described it to me as a "semi-dry" sump.  I don't know/care what it means; it obviously works well.  I did notice a definite color difference in the oil drained from the front tank vs the rear tank.  My tech also told me it adds a step to the oil change; no sweat.   ::001::
In the stable: Me-'17 TENERE ES & '86 FJ 1200; Wife-'01 TW 200; Son 1-'16 R6; Son 2-'14 FJR ES
Out to Pasture: '77 XS 360; '81 SECA 550; '00 KZ 1000P; '04 BMW 1150 RT-P; '11 ST1300PA; '11 KLR

Offline EricV

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Re: Dry Sump??
« Reply #5 on: August 12, 2017, 07:14:03 pm »
Thanks for the explanation however I am familiar with this type of design and have no problems with my bike. I was curious as to why people refer to this as a dry sump when it is not.
Hmm, then you should be able to understand the description above.  It is a dry sump, it's just not a stand alone design with a mechanically separate reservoir.  The engine only has a quart or so of oil in it at any one time.  The oil pump draws oil from the separate reservoir, pumps it thru the engine and back to the reservoir.  There is no wet sump at the bottom of the engine with any significant volume of oil present and rods skimming thru it with wipers, etc.

If you don't feel it's a dry sump design, what type do you believe it to be? 

The lack of an external reservoir, (aircraft or older HD, for example), does not preclude it from being a dry sump.  The two drain plugs are part of the giveaway to the nature of the design.  Another is the sight glass and very specific nature of the oil level check routine in the owner's manual.
Matte Black 2015 Super Tenere
Rumbux Adventure Products Importer
Eval Innovations Inc.

Online jack d

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Re: Dry Sump??
« Reply #6 on: August 12, 2017, 11:37:53 pm »
I finally did find a diagram of the oiling system and saw that there are 2 separate oil pumps in the oil pump assembly. The feed pump pulls oil from the rear section of the crankcase and supplies the engine and transmission. Oil drains from the engine and transmission into both the front and rear sections of the bottom of the engine. The rear section is considered the oil tank while the front is what would be called the dry sump as the scavenge pump pulls oil from there to keep it "dry" and returns that oil to the rear section or tank. So yes it is a dry sump engine. Thanks for the comments.

Online jack d

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Re: Dry Sump??
« Reply #7 on: August 13, 2017, 10:31:51 am »
So after debating this and researching on the internet I happened upon a different thread pertaining to oil level and there was some very detailed explanations of the oil system and the unique dry sump of the Tenere. Should have done a forum search before posting.

Offline Checkswrecks

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Re: Dry Sump??
« Reply #8 on: August 13, 2017, 11:13:00 am »
No problem and this thread was probably enlightening to a few others.
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Offline Paletes3

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Re: Dry Sump??
« Reply #9 on: August 15, 2017, 03:18:46 am »
Try these videos, they explain the S10 dry sump system:

https://youtu.be/rb5yq46IHmo

https://youtu.be/eE3JiG2ni18
XT1200Z 2016 Race Blu series

The journey not the arrival matters - T.S.Eliot

Online jack d

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Re: Dry Sump??
« Reply #10 on: August 15, 2017, 08:53:52 am »
Thanks, a picture is worth a thousand words.

 

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