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Old 04-21-2012, 07:56 AM   #1 (permalink)
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Oil flow problem

Just finished putting my Twin Cam 88 back toghether, Bought it with heads off and Cam plate and cams missing. put it back with stock cams and plate. Ran fine and oil pressure light went off immediatly at Idle.
Road for the first time yesterday and after a few miles the oil light was on at low rpm.
Brought it home and checked the oil. No oil in the sump???
Tried it again this am at idle and checked the oil after it warmed up, oil light stays off but after a few minutes No oil in the sump.
Look like the cam cover comes off to make sure the relief valve is not stuck. Any other suggestions?
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Old 04-21-2012, 08:20 AM   #2 (permalink)
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Uncle Salty is reading this now saying WTF is this?
What bike? What do you mean, "No oil in the sump?" Are you talking about the oil tank or the sump? There is not supposed to be much oil in the sump. It's supposed to be in the tank. If it's not in the tank then it's probably not scavenging properly. Could be the oil pump not assembled or aligned properly. But I'm just a rookie. More experienced help is around here and I'm sure they will chime in.
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Old 04-21-2012, 08:47 AM   #3 (permalink)
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bike year/model? Mine does not have a 'sump'...not sure what you mean there. Sounds like oil is heating up (thinning out) like it normally does which causes oil pressure to drop slightly from when started cold. I eventually put a pressure gauge on mine (did not come stock) and a hot day it's pretty low (0-5psi) at idle.
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Old 04-21-2012, 10:01 AM   #4 (permalink)
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oil flow

1999 Dyna with 30 k miles
The sump is the oil resevior where the dip stick is.
I checked the oil right after the bike has been turned of and found no oil. After it sets a while the oil returns.
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Old 04-21-2012, 10:42 AM   #5 (permalink)
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Uncle Salty is reading this now saying WTF is this?
The tank (or pan as some call it) is where the dipstick is and where most of the oil should be. The sump is the lower area of the motor where the oil collects after it has done it's work of lubricating and cooling the motor. One stage or section of the oil pump sends oil to the motor under pressure. Another stage of the pump scavenges the oil from the sump and returns it to the oil tank. It sounds like the problem on your scoot is the scavenge stage of the oil pump is not removing the oil from the sump fast enough. A possible cause is the pump was not assembled or aligned properly. Also, did you check the crankshaft runout while it was apart? Could have a scissored crank. There may be other causes.
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Old 04-21-2012, 11:06 AM   #6 (permalink)
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thanks

did check the crank .005 runnout
looks like i need to pull the cam plate and get back into the pump.
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Old 04-21-2012, 12:13 PM   #7 (permalink)
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Quote:
Originally Posted by Richard001 View Post
did check the crank .005 runnout
looks like i need to pull the cam plate and get back into the pump.
Pump could be put together wrong or you pinched or rolled and o-ring.
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Old 04-21-2012, 12:38 PM   #8 (permalink)
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I thought it might be an "O" Rings on the back oil pimp cut during assembly.
Can I check the relief valve and spring without pulling out the cam support plate?
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Old 04-21-2012, 01:55 PM   #9 (permalink)
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Uncle Salty is reading this now saying WTF is this?
It's been a few years since I was in the cam chest and that was my only time in there so I forget exactly how everything looks. I would think the cam plate needs to come out to inspect the relief spring and plunger but I can't swear to it. The relief system may be the problem with your low pressure but not the problem with oil collecting in the sump. Like I said in my first post, there are more experienced Harley wrenches on the board that may have additional information. They're probably out riding today.
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Old 04-22-2012, 01:13 PM   #10 (permalink)
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Quote:
Originally Posted by Richard001 View Post
I thought it might be an "O" Rings on the back oil pimp cut during assembly.
Can I check the relief valve and spring without pulling out the cam support plate?

You should be able to tap the roll pin in enough to do that, I've done it in the past with no problems. You just have to be extra careful not to hose up the spring by driving the roll pin into one of the coils
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Old 04-22-2012, 02:13 PM   #11 (permalink)
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Are you sure you assembled the oil pump gears in the proper sequince, almost sounds like the gears are reversed.
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Old 04-22-2012, 07:39 PM   #12 (permalink)
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claydbal is reading this now saying WTF is this?
if you dont fix the crank, the pump will be the least of your worries.
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Old 04-22-2012, 08:50 PM   #13 (permalink)
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Oil Pump and Runnout on Crank

Thought I put the oil pump toghether right but looks like I will have to take it out and will find out. On the crank I thought .005 was OK for a chain drive cam. If not what is correct?
Will start dissassembly next week and will post what I find.
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Old 04-22-2012, 08:54 PM   #14 (permalink)
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.004 max. ...............................
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Old 04-22-2012, 09:56 PM   #15 (permalink)
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Thanks

Ok
Will check it again when I get the cam plate out.
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