Engine Hardware & Block Components

Engine Hardware & Block Components covers the small but important parts that fix known weak points in diesel engine blocks. These are the kinds of parts that cost little compared to the damage they prevent, which is why they are often installed during other repairs or as preventive maintenance.

The best-known example here is the Cummins "killer dowel pin," a timing case dowel that can work loose on 5.9L 12-valve and 24-valve engines and fall into the timing gears. Industrial Injection and BD Diesel offer dowel pin repair kits that lock it in place. We also carry freeze plug side and back plates for Cummins 5.9L and 6.7L engines, which replace factory press-in plugs that can leak or push out, along with air bleed valves and other block hardware from Moroso, Fleece, Cummins and Hamilton Cams.

If you own a 5.9L Cummins, checking the dowel pin is one of the cheapest insurance policies you can buy. For gaskets and seals, see Engine Gaskets & Seals, and for studs and bolts, see Head Studs & Fasteners.