BMK-11 By-Pass System Installation
On an Imported Land Cruiser
HDJ81 4.2L Turbo Diesel
Provided by JDM Cars Canada

*** Note: BMK-11 has been replaced with BMK-21 ***

BMK11 Kit



The Ea By-Pass Oil Filter (EaBP) provides the best possible filtration protection against wear and oil degradation. Working in conjunction with the engine’s full-flow oil filter, the AMSOIL Ea By-Pass Filter operates by filtering oil on a “partial-flow” basis. It draws approximately 10 percent of the oil pump’s capacity at any one time and traps the extremely small, wear-causing contaminants that full-flow filters can’t remove. The AMSOIL Ea Bypass Filter typically filters all the oil in the system several times an hour, so the engine continuously receives analytically clean oil.

By-pass Basics

By-pass oil filtration features a secondary filter with the purpose of eliminating nearly all contaminants in engine oil. They have high capacities and eliminate much smaller particles than full-flow filters, including soot. By-pass filters reduce engine wear and increase oil volume, but their high efficiencies mean they also have higher restriction and must be used in conjunction with a full-flow filter. By-pass filters operate by filtering oil on a “partial-flow” basis. They draw approximately 10 percent of the oil pump’s capacity at any one time and trap the extremely small, wear causing contaminants that full-flow filters can’t remove. Bypass
filters have a high pressure differential, causing the oil to flow through them very slowly and allowing for the removal of smaller contaminants. It is called by-pass filtration because the oil flows from the by-pass filter back to the sump and bypasses the engine. This continual process will eventually make all of the oil analytically clean, reduces long-term wear and can extend drain intervals.

BMK11 installed on 1HD-T



1. To install the By-Pass kit without drilling holes in the body.

2. Easy access to replace filter.

3. Use the biggest available filter to maximize oil system capacity and oil cooling.






Step by Step Installation Procedure
Click here to Download the BMK-11 Installation and Servicing Instructions

BMK11 Diagram

The BMK 11 system can easily adopted to almost any vehicle. The high pressure oil is tapped out of Oil Pressure Sending Unit using a "T" adaptor. Refer to the PDF file for "T" adaptor part numbers for all makes and model.

Step 1:

Remove Oil Pressure Sending Unit from engine block and install the "T" adaptor with its extension.

sending unit removed

Remove sending unit and install the T adaptor

With the full flow filter out of the way you can see the installed "T" clearly.


high pressure line out

Step 2:

Measure and cut braided hose that come with the kit. Connect hose fittings to the ends.

Install one end of the hose to the "T". Other end of this hose will connect to the Filter Mount Assembly "IN".





install sending unitStep 3:

Install the sending unit to the "T" and connect the oil pressure wiring harness to restore oil pressure gauge reading.








Showing the Filter Mount Assembly with
90° Street Elbow's with oil sampling petcock valve (optional)

filter adaptor mount Step 4:

Fabricate a bracket to install the Filter Mount Assembly.

The filter can be installed in an angle. Acceptable mounting angles are between 20° - 160°. Refer the PDF file for the diagram.

Install the Filter Mount Assembly to the fabricated mounting bracket as shown in the picture.

Connect the high pressure oil line from the "T" to the "IN" of the Filter Mount Assembly with 90° Street Elbow connector.

Step 5:

Install 90° Street Elbow connector to the Filter Mount Assembly "OUT" for the return line.








The return line can be sent to the sump or the Oil Filler Cap using the "Return Line Swivel Fitting". This set up is easier than drilling into the oil sump. The part number is BP-89

return line swivel adaptor

return line to oil capStep 6:

Mount the "Return Line Swivel Fitting" to the oil filler cap and connect one end of the return line braided hose.








oil line insulationStep 7:

connect the other end of the return line to the
Filter Mount Assembly "OUT"

Take precaution and insulate the braided hose where it comes in contact with metal parts subject to vibration and heat. This will ensure a long lasting lines.





install filter elementStep 8:

Fill filter element with oil, and install it to the
Filter Mount Assembly.

Start engine and check for leaks.







check oil flowStep 9:

Check for oil return from the by-pass kit. This might take up to a minute.

The delay is due to the large filter filling up with oil. Once you see the oil coming out of the return line, check for oil level.

This set up will take about 3 quarts of additional oil. Add oil as required and again check for leaks.




Installation is complete and this engine is now
protected beyond normal standards.

The filtration efficiency is about 98.7 % @ 2 microns.
Almost like replacing your motor oil every 10 minutes!!!


Soot Removal ChartSoot Removal

AMSOIL's high-efficiency by-pass filter element is also a soot removal device. AMSOIL Ea By-Pass Filters use a synthetic/cellulose sandwiched media. The inner layer of the element is composed of a highly efficient cellulose media covered with a full synthetic media outer layer. These filters remove 39 percent of soot contaminants less than one micron. Soot removal efficiency increases approximately 10 to 14 percent when the EaBP Filter is used in conjunction with a standard full-flow filter.

By-Pass Filtration Benefits

• Dramatically Extended Drain Intervals
• Improved Oil Cooling
• Increased Filtration Capacity and Life
• Increased Fluid System Capacity
• Efficient Small Particle and Soot Removal
• Significantly Extended Engine Life
• Equipment Constantly Runs on Clean Oil
• Increased Engine Efficiency
• Remove Particles Less Than One Micron