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Engine Mechanical TopicsDiscussion for motor builds, cams, head work, stripped bolts and other engine related issues. The good and the bad. If it goes round and around or up and down, post it here.
@djl , when i opened the cam chest there was clearly more than 6-8oz. it was more like 16oz or more drained from the cam chest.
I couldn't catch all of it, but this is what came out of mine. Brand new oil was black AF too after a handful of rides and a dyno pull trying to figure out if it was an issue or my imagination.
EDIT: I added a pic of the O-rings too, the correct one is on the left and the one I initially installed is on the right.,
Last edited by snake_eyes; Mar 18, 2024 at 05:19 PM.
i'll be pulling the cam plate this week and checking the pump and plate as well as the oring. is there anything else that could cause it other than the oring.
As you have figured out, sumping is a condition wherein oil is not scavenged by the pump fast enough to avoid fillling the crank case with oil. The two most common contributors to this condtion are oil passing by the oring between the pump and the motor case or mis-alignment of the oil pump. You should check the pump internals as well as crank runout. As Swedish Meatball suggests, if the crank has been twisted, excessive runout could have damaged the pump internals which, obviously, would result in sumping if the pump was not scavenging as it should. Are you sure you used the correct oring on the oil pump?
EDIT: I just saw the last pictures and if I am reading correctly and the smaller black oring was the one installed, I think you have found the source of the sumping. Still worth checking everything else while the cam chest is open.
I couldn't catch all of it, but this is what came out of mine. Brand new oil was black AF too after a handful of rides and a dyno pull trying to figure out if it was an issue or my imagination.
EDIT: I added a pic of the O-rings too, the correct one is on the left and the one I initially installed is on the right.,
only had ~50 miles on the oil and it was jet black. also. the oring on the right is the one I installed. I just my cam kit and the one on the left is still in the package.
@djl..definitely will be disassembling the pump. runout was just checked..004.
thanks
As you have figured out, sumping is a condition wherein oil is not scavenged by the pump fast enough to avoid fillling the crank case with oil. The two most common contributors to this condtion are oil passing by the oring between the pump and the motor case or mis-alignment of the oil pump. You should check the pump internals as well as crank runout. As Swedish Meatball suggests, if the crank has been twisted, excessive runout could have damaged the pump internals which, obviously, would result in sumping if the pump was not scavenging as it should. Are you sure you used the correct oring on the oil pump?
EDIT: I just saw the last pictures and if I am reading correctly and the smaller black oring was the one installed, I think you have found the source of the sumping. Still worth checking everything else while the cam chest is open.
You are confusing my responses with those from the OP @memphisharley
You are confusing my responses with those from the OP @memphisharley
You are right. I was wondering why in his last post the OP says he would be pulling the cam plate this week and the very next post was yours with the pictures; should have caught that; my bad and thanks for pointing that out. I will delete the wrong responding post.
only had ~50 miles on the oil and it was jet black. also. the oring on the right is the one I installed. I just my cam kit and the one on the left is still in the package.
@djl..definitely will be disassembling the pump. runout was just checked..004.
thanks
The one on the left (yellow) is the one you want. Install in case.
As a side note; it is the same oring used for top pushrod covers. The one that pushes up into the head.
I was wondering why in his last post the OP says he would be pulling the cam plate this week and the very next post was yours with the pictures; should have caught that; my bad and thanks for pointing that out. I will delete the wrong responding post.
