Jackmaster Bypass Oil Filter - Canister Assembly.
We are committed to providing the most cost effective bypass filter available. This budget priced, high pressure diecast, aluminium alloy filter container is designed to last and can be fitted with standard cellulose rolls that are compatible with other systems such as Frantz and Kleenoil. A FREE filter (below) is included with each purchase.
Cellulose Roll Filter
A tightly wound cellulose roll in a fine cheese-cloth bag with a metal eyelet for easy, clean removal. Designed to continuously clean lubrication oil of harmful and corrosive solids, water and chemicals. Approximate size 105mm dia. X 105 mm length. We sell these elements in any quantity you wish.  
Cellulose Oil Filter
9 pack
Cellulose Roll Filter
six pack
Jackmaster Filter Elements are Interchangeable with Kleenoil, Frantz and Some Other Makes of Filters.
This means that you can use the filter elements from those filters in our product if you wish to do so. We adopted a standard and have not attempted to hold the purchaser hostage to using our element. Rather, we wish to assure people that, when you purchase our filter, you will always be assured of easy access to a supply of elements. Talk to us at any time you have a question about elements and we will respond with an unbiased answer.
The dimensions of our filter elements are approximately 105mm to 106mm in diameter x 105mm in length. They are tightly wound from virgin paper and enclosed in a cotton type bag with a metal ring pull on top to assist in easy removal. The inside diameter of our filter canister is 104mm diameter.
Using Off-the-Shelf Paper Rolls.
The criteria for using standard toilet rolls is as follows: It is best to use virgin paper - not recycled paper.
(a) The roll needs to be tightly wound. This prevents chanelling. (oil finding an easy passage through the roll) The test for this is to poke your finger into the end of the roll. It needs to be hard, solid like a piece of wood or at least almost so.
(b) The roll should be made from high quality virgin paper. Recycling paper breaks down the fibres into shorter fibres. Recycled paper will still act as an effective oil filter, but recycled paper becomes more mushy when it is saturated with water - more so than virgin paper and it tends to disintegrate in water more easily. The long fibres of quality paper give it strength and it has the ability to absorb more water. There are many rolls made from good paper and you can get an idea of the quality of rolls by comparing how they tear apart when you stretch the sheets until they tear. You will see the long fibre structure at the torn edges. Good, new paper has a soft feel and appearance. The ply of the paper is not important. There is a lot said about 2 ply paper when looking for good rolls, but this is only because certain good rolls were 2 ply. The working principle relies on layers of paper tightly impacted together and it wouldn't matter how many plys were involved once it is tightly packed. Just remove enough paper until the roll is a tight fit in the canister. For easy removal you can place a couple of thin ribbon tapes under the roll before you insert it. You can tie them at the top of the roll to give you a grip for removal. These can be used to pull it out when you need to. A roll comes out much easier when it has been used and impregnated with oil.
(c) The best cardboard centre core is 38mm ID and made from a good thick cardboard. This is the hardest thing to find and is not so important when using the Stainless Steel Spring adaptor which takes care of this. The adaptor simply ensures that the roll is held firmly down on the bottom seal even though it may be larger than 38mm ID. The unique design of this type of filter relies on the roll being forced down onto the lower seal by the oil pressure. As long as you have pushed it firmly onto the seal with the palm of your hand, the oil pressure takes over. However, for rolls with larger ID's, the spring adaptor ensures that the roll is down firmly before the oil pressure begins, otherwise oil would simply bypass the roll from the inlet port to the outlet port. The adaptor is also needed in case you would like to run the filter upside down, which has been done in some cases. Many people use standard rolls without the adaptor successfully, it is simply good insurance.
Contrary to what you often hear - that the roll will break down and allow paper mash to enter the engine oil galleries - it is perfectly safe. Paper does not break down in oil as it does in water. It actually becomes stronger. The test for this is to create an oil patch on a piece of toilet paper by saturating an area with oil. Then apply tensile stress and pull it apart. The paper will tear along the edge of the oil patch. The results are magnified by wetting it with water after you create the oil patch. Paper is a great absorbent for water. The fibres soak it up readily. Oil molecules are too large to enter the fibres and tend to surround them and pass between them. Anyway, if the paper could possibly break down in some way, how would it pass through the tiny pressure orifice at the bottom of the filter? Paper pulp would simply block the orifice and back up, creating a tiny plug and prevent anything from passing through. So, even if you used low quality paper and put water through the filter, it couldn't happen. The roll will just absorb water until it is saturated, then it blocks up and will allow nothing through, oil or water. We have done many tests on this and the same principle has been used without problems since early in the last century.
Filter elements sold individually or cheaper in quantity orders. Package quantities are determined by the Post Office satchel sizes available. Quantities other than shown below can be quoted and boxed for sending.

Used paper roll - this is a standard toilet roll - showing a deep impression of the filter element rack. This form has been impressed on the roll due to the great force exerted downwards on the roll by engine oil pressure. Some people question the ease at which the used roll can be extracted thinking that leakage around the roll is possible. This image is proof that there is no peripheral leakage, otherwise there would not be enough downward force to cause this shape on the roll base. If you have thrown away the bottom cone seal with one of your used rolls you will not see these deep impressions and your filter will not be working.

The roll may look loose in the canister when you want to remove it after some use.
Some people think that oil is able to pass down around the element and thus oil will go through unfiltered. The element goes into the cannister tightly but when it is ready to be replaced it appears to be quite loose. This is normal, and just as well, otherwise it would be difficult to remove. The downward pressure on the roll is quite considerable. If you calculate the area of the top of the 4 inch diameter roll at 12.56 square inches and multiply it by 65 PSI, which is a common oil pressure, you will arrive at a figure of 816 pounds downward pressure on the roll; over a third of a ton. This pressure is reduced by the amount of oil that is able to seep through the roll. That still leaves a very large force exerted down on the roll. This pressure is able to reduce the length of the roll whilst it is in operation, and at the same time it increases the area of the roll. If you watched the roll performing under pressure, as we did, in a transparent cannister, during the development of the filter, you would see how it operates. It was quite remarkable to watch the height of the roll diminish and the diameter expand tightly against the wall of the 3/4 inch thick, clear-perspex cannister we built for the test. Toward the bottom, the roll developed crinkles, which actually helped to impede the flow of oil through the element. This process was one of the claims in the original patent of the paper roll filter. The proof of this process is the deep indentation created on the base of the roll during use. If you ever pulled a roll out and it had no indentation, caused by the element rack, at the bottom, then you would know that oil was bypassing the element.
To install an element correctly, all you need do is push it down firmly onto the bottom, centre seal, using the palm of your hand. It is not important to worry about the outside edge of the roll. The oil pressure will certainly push that firmly down, once you start the engine.
We do not attempt to hold the user hostage to using our elements. We have therefore used a standard element size that is accepted within the industry and our elements are interchangeable with Frantz, Kleenoil and some other filters. You are assured that you will always be able to access elements to fit your Jackmaster Filter.