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  #1  
Old 27th June 2020
pucketprutectah's Avatar
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Default 80 xl1000 oil not circulating?

I've been bringing a friend's newly purchased 1980 xlh100 out of cold storage and fixing a variety of oddly managed problems from the previous owner.
I've got pretty much everything sussed out except cleaning up the electrical wiring, but I'm having a mental moment about the oil circulation.
I wanted to get as much of the old oil out of the crankcase as possiblef, while adding new oil from the reserve tank, so I removed the return line and stuck it into a can while adding new oil to a clean tank.
upon starting it up, the return line pumped old nasty oil into the can for a bit but then stopped, and the oil tank doesn't appear to be pumping the new into the crankcase. i tried reattaching the return line to the tank, after a few days wait to see if the oil would seep into the sump on its own. tried it again, and the oil still does not seem to be draining from the tank to crankcase.
I have removed all the oil lines previously and blown them out to make sure they don't have any storage clogs.
can you guys help fix my head straight before I ruin something? what am I doing wrong?
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Last edited by pucketprutectah; 27th June 2020 at 21:42..
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  #2  
Old 28th June 2020
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Default

Quote:
Originally Posted by pucketprutectah View Post
I've been bringing a friend's newly purchased 1980 xlh100 out of cold storage and fixing a variety of oddly managed problems from the previous owner.
I've got pretty much everything sussed out except cleaning up the electrical wiring, but I'm having a mental moment about the oil circulation.
I wanted to get as much of the old oil out of the crankcase as possiblef, while adding new oil from the reserve tank, so I removed the return line and stuck it into a can while adding new oil to a clean tank.
upon starting it up, the return line pumped old nasty oil into the can for a bit but then stopped, and the oil tank doesn't appear to be pumping the new into the crankcase. i tried reattaching the return line to the tank, after a few days wait to see if the oil would seep into the sump on its own. tried it again, and the oil still does not seem to be draining from the tank to crankcase.
I have removed all the oil lines previously and blown them out to make sure they don't have any storage clogs.
can you guys help fix my head straight before I ruin something? what am I doing wrong?
It’s a “dry sump” system.

It’s not supposed to drain from the tank to the crankcase.
The oil goes from the tank to the oil pump inlet.
As oil gets into the crankcase sump, the scavenge section of the oil pump (two section oil pump) , sends the oil back to the tank.
After sitting a long time, oil can seep into the sump, but it’s not the normal condition.

Read the description of the oil system in the sportsterpedia, then let us know if you still think there is a problem.

http://sportsterpedia.com/doku.php/techtalk:ihil01
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  #3  
Old 4 Weeks Ago
pucketprutectah's Avatar
pucketprutectah pucketprutectah is offline
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Default

After reviewing this information, I'm still confused. I understand that the sump will fill after sitting and will occasionally burp up a bit of oil on startup. That isn't my issue. The problem is that the return oil line doesn't seem to be pushing oil from the crankcase to the reservoir tank. Also, the oil in the reservoir is not being pulled to the crankcase.

I took the small allen screws out of the rocker covers and verified after running for a minute that there does seem to be oil getting to the top end. After finishing off the electrical nightmares and various previous owner mickey mousery, i took the bike for it's first ride in eight years. Had the bike in the shade till startup, with ambient outside temp at 87 degrees. Warmed up the bike for a few minutes to do a final safety check. Rode up and down the block. Decent get up and go from idle to mid. Problems in the mids, because of the stupid drag pipes i haven't replaced yet, and never got to wot. After just a short five minute low speed (30mph) ride, I came back to the garage and put the old laser thermogauge on the bike.

Both cylinders came back at ~265 degrees
Rockers came back at ~150 degrees
oil in the reservoir came back at 104
I've never put a gauge on the reservoir oil after such a short ride, so I'm unsure what to expect.
-Could be the oil circulation is adequate under engine load, and didn't have enough time to get up to normal operating temp.
-Also could be the cylinder temperature elevated the reservoir oil temp through convection or conduction.

Would have gone for a longer ride, but I had some fuel issues and didn't want to go too far.
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  #4  
Old 4 Weeks Ago
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Default

The engine heats up faster than the oil does.
It can take 15-20 mins to heat the oil up with a load on the engine.
The cold oil (feed side) doesn't run as fast into the engine since it's thicker until it heats up.
You should see a small amount of oil returning to the tank but it isn't like turning on a water faucet.
You may need a flashlight to actually see the flow.
If you are concerned at all if oil is going to the engine from tank, don't ride it.
Get an oil pressure gauge and verify you have pressure first.
You can pull the oil switch off the pump and watch for oil to skeet out the hole also.
This also primes the oil pump.
If the feed side line has been off recently, there can be air in the line that blocks oil from getting to the pump.

That'll tell you if tank oil is getting into the engine.
If you don't have oil pressure on the feed side or oil skeeting out the pump, pull the oil pump and check the internals for damage.
If no, pull the cam cover and check for a damaged oil pump drive gear on the pinion shaft.
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  #5  
Old 3 Weeks Ago
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Quote:
Originally Posted by Hippysmack View Post
You can pull the oil switch off the pump and watch for oil to skeet out the hole also.
This also primes the oil pump.
If the feed side line has been off recently, there can be air in the line that blocks oil from getting to the pump.
You see, this is the kind of information you just can't get anywhere else. Honestly, I've searched everywhere for this answer. Watched tons of videos, looked through the various service manuals, blogs, etc. Thanks again, Hippysmack.
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  #6  
Old 3 Weeks Ago
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Aw shucks...
I can't take all the credit.
Priming the oil pump is in the 70-78 FSM pg 3-28.

Did that fix the problem?
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Old 3 Weeks Ago
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Quote:
Originally Posted by Hippysmack View Post
Did that fix the problem?
I'll let you know as soon as i can get into it. Just went back to work, so it may be a few days.
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