381279 Exhaust Manifold for CATERPILLAR 3400 Series Application

It routes exhaust gases from the cylinder head into the rest of the exhaust system for proper flow and performance. This diesel engine exhaust manifold is intended for heavy-duty applications using compatible Caterpillar 3400 series engine parts. Proper routing and sealing help protect surrounding components from heat and exhaust leaks.

It is commonly used as a replacement for Caterpillar OEM numbers 1017354, 1028503, 3863060, 4W4384, and 6I3655 (including dash-formatted equivalents). Match your current part number/casting number and engine application to confirm fit. When in doubt, verify with the engine serial number before installing a heavy-duty truck exhaust manifold.

Confirm the engine is a Caterpillar 3400 series and cross-reference the existing manifold number to the replacement numbers listed for this Caterpillar 3400 series exhaust manifold. Checking physical details like approximate weight (about 23.08 lbs) and overall configuration can also help confirm you’re selecting the right diesel engine exhaust manifold. If there were prior modifications to the exhaust, compare mounting and port alignment before final installation.