Oil problem on my HD Evo 1993?

Question

i recently replaced my tappets and tappets guide and change upper engine gasket.

during my first test run i had a oil leak around the front tappet guide, but not on my second run.

on my second run, after few miles my oil pressure dropped, but no leak anywhere on the bike.

i decided to check oil level in my tank.

oil was almost at the top and bubbling, splitting oil all over.

my guess is all the oil from the crank case went back to the oil tank but no oil was feeding in the engine.

bubbling was due to air coming from the crank case.

where the problem can com from ?

-oil feeding hose ?

-oil pump gear ?

-oil pump pressure valve ?

i need some help over hear before breaking the oil pump apart.

if any pro builders or people experienced the same problem can give me some answers it would be great

by the way, i have a S&S oil pump

thanks in advance

Answer 1

well buy cheap gas or just use corn oil

Answer 2

Sounds like somebody added oil with out starting the engine first

I wouldnt think you had any of the lines off and got them crossed Or had the cone off and got the breather out of time

Answer 3

We need a bit more info.Which model bike?I'm guessing a Softail.Did you add oil to the tank after you reassembled the tappets and push rods?Harleys are dry sump engines,This means in normal operation the crankcase runs with very little oil in it.I'm going to give you a guess here.And this is assuming you assembled it right when you put it back together.I'm guessing you added oil when you were done.While it was apart there's a chance the crankcase filled up with oil.Then when you were done you thought it was low on oil.You added some.Then when you fired it up the crankcase pressure forces the oil in the crankcase to cause your leak til it pumped it all back up to the tank.Then the leak quit.When you opened the oil tank fill you found it full of oil because of all the extra oil that was pumped back to the tank.The bubbling was because the vent line inlet to the tank was covered by too high an oil level.Try lowering the oil level back to the proper spot and see if that fixes it.I hope this helps you.

Answer 4

well did you check oil? new parts including gasket have break in! it's recommended to keep speed down.

check tappet screen and se if any metal parts/ with a magnet maybe more problem than you thought?

run maybe 250 miles and change oil/ again check with magnet in oil pan? to see if any metal? could something rubbing?

Answer 5

The Evo doesn't have a crankcase. For the oil to run back to the tank it would have to run up hill, when you shut the engine off the oil stays right where its at. I don't know about S&S pumps, but the stock one has a filter screen in it. Its located right on top of the pump. It should be cleaned, their is a spring around the screen that we used to stretch a little bit to boost the oil pressure. Maybe S&S has the same on their pumps. Hope that helps.