Question about Harley Davidson XLH Sportster 883 Motorcycles

1 Answer

Pressure build up in oil reservior.

Pushing oil out of the oil reservior throught the oil cap. What is the reason for the pressure build up in the oil reservior.

Posted by Anonymous on


1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points


    An expert that got 20 achievements.


    An expert that got 10 achievements.


    An expert that got 5 achievements.

  • Harley Davidson Master
  • 3,506 Answers

Most likley abswer is to much oil in the system. Try running it halfway between add and full and check it when it is HOT

Posted on Oct 15, 2014


3 Suggested Answers

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi there,
Save hours of searching online or wasting money on unnecessary repairs by talking to a 6YA Expert who can help you resolve this issue over the phone in a minute or two.

Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.

Here's a link to this great service

Good luck!

Posted on Jan 02, 2017


SOURCE: oil cap popping off

The engine breather pipe is clogged ! clean it and the problem sloved!

Good luck.

Knight (Yamaha seca XJ750 A 1981)

Posted on Apr 17, 2009

  • 5 Answers

SOURCE: 1969 triumph trident bobber has to much oil

yes! sounds like exsesive crankcase pressure. time for a top end rebuild.

Posted on Apr 24, 2009

Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

2 Answers

Have a 1973 Ford and I was wondering can the oil leak from the stem of the disturber

TYes it can, although not common. there is an O-ring on the shaft that seals inside the dist. hole. You can replace it easily after removing the Dist.Make sure You leak is not coming from the the end seals of the intake manifold?

Aug 16, 2014 | Cars & Trucks

1 Answer

Why does oil pressure build up in the oil reservior

Did you add oil , engine is a dry sump, and reservoir oil tank will gravity feed and swamp crankcase, when sitting over winter. Also make sure tank is vented.

May 07, 2014 | Harley Davidson Motorcycles

1 Answer

Why does oil pressure build up in oil reservior

Check for a pinched/blocked vent line.
Possible bad piston rings and over pressurizing the crank case (compression blow-by).
Overfilling the oil tank. Check with engine hot.
Also, it could be just a aged/dried up/ cracked o-ring.

May 07, 2014 | Harley Davidson XLH Sportster 883...

1 Answer

Pressure build up in oil reservior

Most likely too much oil in the system. Check it HOT and only have about half way between add and full. Definitely not more than the full mark.

May 07, 2014 | Harley Davidson XL Sportster 883...

1 Answer

Oil pressure leaks tapet cover

you may have broken piston rings and your sump is being pressurized and blowing the oil out

Apr 02, 2014 | 2002 Ford Explorer

1 Answer

Oil and Water mixing in the reservior

Bad radiator, blown head gasket.

Apr 06, 2012 | Cars & Trucks

1 Answer

Pressure is building up under valve cover. its pushing oil out. when opening oil cap lots of air comes out

either oil ports are clogged not allowing drainage? or compression is bypassing the rings placing it in the crankcase assy area, Meaning worn cylender or cracked ring most likely

Jun 09, 2010 | 1996 Volvo 960

1 Answer

Pressure inside oil tankl

All air compressor will build pressure in the oil reservoir. This is caused by blow-by past the piston rings. The reason all compressors have this is due to the relatively slow rpm that the compressor crank is turning. Unlike a car's engine that is turning so fast the compressed gas doesn't have time to leak by the rings.
To deal with this problem air compressors have a special oil fill cap that alows the pressurized air to be vented out of the oil reservoir chamber.

There are three reasons that you are having this problem. The first is you have a clocked oil cap vent. Second is you have the wrong type of oil cap.
The third is the bad one. If the problem is unrelated to the oil cap then it means there is more blow-by then the vent cap can handle. This would indicate that you have worn or broken rings and/or worn cylinder wall.

If your compressor is not old (low hours), then take a close look at the cap. If it has more then 2000 hours then you will most likely need to rebuild the compressor, depending on the make and model.
Hope this helps and good luck.

Dec 12, 2009 | Air Tools & Compressors

1 Answer

Low oil pressure

Your main crank bearings and crank cap bearings are probablly worn well above spec which means that the oil flow is going throught them to quick and your not getting resistance to build pressure which means you need a motor rebuild

Aug 12, 2008 | 1999 Chevrolet S-10 Pickup

Not finding what you are looking for?
Motorcycles Logo

Related Topics:

55 people viewed this question

Ask a Question

Usually answered in minutes!

Top Harley Davidson Experts

Arnie Burke
Arnie Burke

Level 3 Expert

4903 Answers


Level 3 Expert

4349 Answers


Level 3 Expert

79865 Answers

Are you a Harley Davidson Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides