New 124" build is sumping?
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Stellar HDF Member
Joined: Oct 2007
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From: New Bern NC
New 124" build is sumping?
OK guys I need some help here. I'm running out of things to check. I had a complete bottom end rebuild done on my 08 Street Glide. I had a Jim's 4 5/8" crank installed, the Timkin bearing conversion was done and the cases were bored for 4.125 pistons. I had the heads done, and new valves and springs. I assembled it with new cylinders and pistons and a new stock oil pump. I fired it up with no problems heat cycled it a few times and took it to a tuner in the area.
He called the next day and told me it was sumping. He took the cam chest apart and I had put the wrong O ring on the scavenge side of the oil pump when I put it together. OK simple enough right, NOT. He called back the next day to tell me it was still sumping. I trailered the bike back home, ordered a Feuling cam plate and oil pump. Put it back together and it still sumped. I pulled the oil pan everything was clean and clear. I started following the oil path and found that the port from the sump back to the scavenge side of the oil pump seemed to be blocked. I pulled the motor back out, split the cases and found what was left of a black ty-wrap in the crank case. I wasn't happy but at least I had found the problem, or so I thought, NOT.
I blew out all the oil passages, made sure the cam plate and the oil pump were clear and reassembled the motor again. I noticed that the oil pressure at start up seemed a little higher than before, 50lbs at idle cold. I let it warm up and then took it for a short ride, maybe 2 miles. Everything seemed fine and I thought once again that all was good, NOT. It was still sumping, so bad the oil gauge was all over the place 10lbs to 35lbs. I figured I missed a piece. I tore the motor down again and found nothing, its spotless inside. I blew out the came plate nothing, dissembled the oil pump, clean.
What am I missing?
He called the next day and told me it was sumping. He took the cam chest apart and I had put the wrong O ring on the scavenge side of the oil pump when I put it together. OK simple enough right, NOT. He called back the next day to tell me it was still sumping. I trailered the bike back home, ordered a Feuling cam plate and oil pump. Put it back together and it still sumped. I pulled the oil pan everything was clean and clear. I started following the oil path and found that the port from the sump back to the scavenge side of the oil pump seemed to be blocked. I pulled the motor back out, split the cases and found what was left of a black ty-wrap in the crank case. I wasn't happy but at least I had found the problem, or so I thought, NOT.
I blew out all the oil passages, made sure the cam plate and the oil pump were clear and reassembled the motor again. I noticed that the oil pressure at start up seemed a little higher than before, 50lbs at idle cold. I let it warm up and then took it for a short ride, maybe 2 miles. Everything seemed fine and I thought once again that all was good, NOT. It was still sumping, so bad the oil gauge was all over the place 10lbs to 35lbs. I figured I missed a piece. I tore the motor down again and found nothing, its spotless inside. I blew out the came plate nothing, dissembled the oil pump, clean.
What am I missing?
Seasoned HDF Member
Joined: Jun 2006
Posts: 28,552
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From: Vermont
Did you properly seat the rings? Block in the oil return passage in the heads or cylinders? You said you looked through the cam chest pretty good so I'm thinking of the other areas maybe.
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Stellar HDF Member
Joined: Oct 2007
Posts: 2,806
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From: New Bern NC
Ha! Nope can't blame this one on Mainshaft.
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Stellar HDF Member
Joined: Oct 2007
Posts: 2,806
Likes: 1,754
From: New Bern NC
It hasn't run long enough to seat the rings yet. The tuner heat cycled it but once he put it on the dyno and cranked the throttle a couple of times it was obvious that it was sumping so he stopped.
Thread Starter
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Stellar HDF Member
Joined: Oct 2007
Posts: 2,806
Likes: 1,754
From: New Bern NC
Yea all the O rings are good. I even disassembled the Feuling oil pump to make sure the two internal O rings at the plate that separates the two gerotors weren't pinched or distorted. I have to be missing something. I'm not having a minor sumping issue it's filling the sump in no time.
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