Photo 2/19 | 001 Amsoil Bypass Filter | While Amsoil offers all the pieces individually to build your own custom setup, if you happen to own a Cummins, Duramax, or Power Stroke diesel, there’s a premade kit just for you. Our BMK-32 kit came with everything necessary to install the bypass filter on our ’02 Silverado 2500HD.
Photo 3/19 | 002 Amsoil Bypass Filter | The one area Amsoil falls short is in providing mounting guidance for the filter head. We turned to the aftermarket and picked up a bracket made for our truck and designed to support Amsoil’s BMK-27 dual-bypass filter. We really appreciated the sticker included with the kit that showed where to drill holes to mount the filter head.
Photo 4/19 | 003 Amsoil Bypass Filter | A quick tap with a punch and three holes later, and our BMK-27 bracket was now BMK-32 compatible. Note to the aftermarket: It’s easy for one bracket to do both. You’re welcome.
Photo 6/19 | 005 Amsoil Bypass Filter | Since the kit ships as a collection of pieces, each of the fittings needs to be installed. Amsoil’s kit is complete with everything needed, right down to special thread sealant for the fittings.
Photo 7/19 | 006 Amsoil Bypass Filter | Before tightening the fittings on the filter head and full-flow sandwich adapter, it should be noted which way these fittings need to face for proper hose alignment. Once orientation is determined, the fittings are placed finger tight, plus two to three turns.
Photo 9/19 | 008 Amsoil Bypass Filter | A heavy-duty rubber O-ring seals the sandwich adapter to the engine, and a light coating of oil prior to installation is necessary to ensure proper installation.
Photo 10/19 | 009 Amsoil Bypass Filter | Working on our four-wheel-drive Silverado proved tight when it came to torquing the adapter to the required 40 ft-lb. Take care to ensure the adapter doesn’t rotate into a position where the previously installed hose fitting is inaccessible.
Photo 12/19 | 011 Amsoil Bypass Filter | With the sandwich adapter in place and a mounting location for the bypass filter chosen, you can measure the length of hose required to connect the two. Be sure to leave a few extra inches to account for engine and chassis flex.
Photo 13/19 | 012 Amsoil Bypass Filter | If you don’t already have a good set of hose shears, now is the time to go out and get them. A clean square cut is imperative for proper sealing of the hose fittings, and your kitchen scissors aren’t quite going to cut it here.
Photo 14/19 | 013 Amsoil Bypass Filter | Assembling the hose fittings may seem like a daunting task, but it’s rather simple. Start by screwing the outer nut counterclockwise onto the hose until it bottoms out. Then, after applying a liberal amount of oil or other lube, screw the tapered nipple into the socket until it bottoms out as well.
Photo 16/19 | 015 Amsoil Bypass Filter | Before installing the bypass filter element, it should be filled with oil to prevent an excessive dry start. Our filter consumed half a quart of Amsoil’s Signature Series 15W-40 diesel oil.
Photo 17/19 | 016 Amsoil Bypass Filter | Our bypass filter is mounted to the inside of the driver-side framerail. This spot keeps the filter tucked up and out of the way of damaging road debris.
Photo 18/19 | 017 Amsoil Bypass Filter | With the bypass filter element fully installed, it’s crucial to ensure the feed lines are routed out of the way of anything that moves or is hot or sharp. For an added level of protection, we covered ours with Titanium Protect-A-Sleeve from Design Engineering Inc. This shielding protects from 1,800 degrees of direct heat and up to 2,500 degrees of radiant heat.
Photo 19/19 | 018 Amsoil Bypass Filter | Once oil has made its way through the bypass filter, it is returned to the engine by way of this trick billet-aluminum oil filler cap replacement. We’re not fully sold on running 6 feet of hose for the return, but Amsoil reps say they’ve never heard of an issue arising from this setup when routed properly.