A. Getting started
1. Check all parts against the parts list and inspect for damage.
2. Make sure you have the tools needed for the job.
Recommended tool list
5
⁄
16
Allen wrench Torque wrench Drill
7
⁄
16
wrench (2) Hammer
1
⁄
4
drill bit
7
⁄
8
wrench Center punch Adjustable filter wrench
9
⁄
16
wrench
3. Because of the wide range of possible mounting configurations, hose and hose
fittings are not provided with this mount. Hose should meet or exceed SAE-
100R6 specifications, and have a minimum inside diameter of
1
⁄
4
. The
mount itself has
3
⁄
4
-16 straight threads and the adapter fittings provided are
3
⁄
4
-16 straight x
1
⁄
4
JIC. Read through instructions and determine which
plumbing arrangement best fits your application. Purchase hose and fit-
tings accordingly. Make certain hose fittings match the type of hose chosen.
Note: Hose and hose fittings are available from AMSOIL and your local
AMSOIL dealer. Refer to diagram D and the parts list for
1
⁄
4
components
matched for use with this system.
B. Filter selection
Any of the 3 different sizes of the AMSOIL Spin-On By-Pass Oil Filter elements
may be used with this mount. Select the element size according to your vehi-
cle’s oil capacity.
Vehicle Oil Capacity Recommended Element
15 to 18 quarts use two EaBP-90
15 to 30 quarts use two EaBP-100
15 to 42 quarts use two EaBP-110
Service recommendations for these filters are listed later in these instructions.
Selecting a larger filter than recommended will extend the service interval, while
selecting a smaller filter than recommended will shorten the service interval.
C. Attaching the filter mount
1. Survey the engine compartment for possible mounting locations. Solid
structures such as the firewall, fender well, radiator support or frame are
normal locations. Refer to diagram A for minimum area requirements and con-
sider accessibility for servicing.
2. Note that the filter mount can be rotated 180° in its mounting brackets. This
allows the oil supply and return hoses to enter the mount on either the right
of left hand side. Choose the side that will minimize the need for bends in the
hoses or additional hose fittings. Refer to diagram B for preferred mounting
positions.
3. When the location has been determined, use the mounting template provided
to locate and mark mounting holes. This can be easily done with a center
punch and hammer.
4. With a
1
⁄
4
drill bit, drill out the previously marked mounting holes and
attach the two piece mount bracket. Use the 4 - 1long
1
⁄
4
bolts, nuts, small
washer and fender washers provided. Note the assembly diagram D for
details. Using two
7
⁄
16
wrenches or socket, tightened to 8 foot pounds.
5. Apply thread sealant onto the “O” ring adapter fitting (BP-213) and the
restrictor assembly (BP-202) as noted in diagram C. Install the “O” ring adapter
fitting (BP-213) in the mount end adjacent to the arrows pointing IN. Install
the restrictor assembly (BP-202) in the mount end adjacent to the arrow point-
ing OUT. Using a
7
⁄
8
wrench, tighten both fittings to 40-43 foot pounds.
Warning: The system is designed for partial/by-pass oil flow. Failure to
install the restrictor assembly (BP-202) can result in serious equipment
damage.
6. Apply thread sealant as noted in diagram C to the Allen head “O” ring plugs
(BP-191). Using a
5
⁄
16
Allen head wrench, install plugs in remaining mount
ports and tighten to 40-43 foot pounds. Note: If optional oil sampling valve
is to be used, refer to diagram D and install in place of either Allen head “O”
ring plug.
7. Attach the filter mount to the mounting brackets using 4-1
1
⁄
2
long
1
⁄
4
bolts,
nuts and washers provided. Warning: The bolts must be installed so that the
nuts are on the side opposite the filter nipples. Failure to do this will result
in the bolts hitting the oil filters. Using two
7
⁄
16
wrenches or socket, tighten
to 8 foot pounds.
D. Oil Supply
1. Usable oil pressure sources are available on many engine blocks. There are
openings into the oil channel through the side of the block and in the area of
the existing oil filter (s). Make sure it is an oil pressure opening by replacing
the plug with a gauge and turning the engine over, or by turning the engine
over with the plug out and watching for increased flow. DO NOT START
ENGINE WITHOUT PREPARATION TO CONTROL THE OIL FLOW. Install
appropriate fitting to accept your hose connector.
2. An alternate installation is to use the existing oil pressure sending unit.
Remove the oil pressure sending unit and install a street tee. Then re-install
the sending unit in one arm of the tee. Note: With this installation a slightly
lower oil pressure reading may register, indicating oil flow to the by-pass filter.
A change of 10% or less is not to be considered significant.
3. Install selected hose and hose fittings between the engine block or the
remaining arm of the tee and the filter mount port marked with the arrow point-
ing IN. Hose should be routed in a manner that avoids contact with sharp or
moving parts and minimizes bends. If bends in the hose can not be avoided,
make sure the bend is greater than the minimum radius recommended by the
hose manufacturer. Note: Bends should not start at the fitting. Refer to dia-
gram E for suggestions on proper hose routing.
4. To maintain hose position, plastic hose ties are advised.
E. Oil Return
1. Existing Porting Options: Most engines have an oil return opening in the
crankcase wall or oil pan, usually on the same side as the oil channel pressure
opening but somewhat lower. Remove the plug and determine that it is not a
IMPORTANT NOTICE
Read all instructions completely before attempting to install this unit.
Improper installation could result in serious system and/or equipment
damage. The installation of this system is not difficult, however, some
mechanical ability is necessary. If you are not comfortable with the instruc-
tions or have questions, do not attempt to install this system. Consult a
mechanic or contact AMSOIL INC. for further instructions or assistance.
WARNING: This filter system is not designed to replace the engine’s normal
full-flow filter. Do not attempt to install a by-pass filter element in place of
the existing full-flow filter. This unit was designed for heavy duty and indus-
trial equipment. For automotive and light duty truck applications consult your
AMSOIL dealer for the proper filter mount.
WARNING: Extreme care should be taken to avoid bodily harm during
installation. Before starting, ensure the engine is cool to avoid burns and never
work in the engine compartment area with the engine running.
Dual-Gard By-Pass Filter Mounting Kit
Installation and Servicing Instructions
BMK-12
