2.5L 151 cui "Iron Duke" 4-Cyl. GM Engine Parts for Jeep CJ5
Pilot Bearing, Engine Mounts & Gaskets for the GM Engine (1980-1983).
Why the 2.5L GM Engine in the Jeep CJ5 Needs Its Own Parts.
From 1980 to 1983, Jeep offered the CJ5 with an optional 2.5-liter four-cylinder engine from General Motors – nicknamed the "Iron Duke" – as an alternative to the AMC four-cylinder of the same displacement. While both engines share the same displacement class, they differ significantly in design: the GM engine requires its own oil filter with a different thread size, its own engine gasket sets, and its own engine mounts. After more than forty years, engine and transmission mounts wear out as the rubber ages, the clutch pilot bearing wears from friction against the crankshaft, and gasket sets harden and become porous. The rubber bushings and studs of the Dana 300 transmission insulator also wear over time, leading to noticeable driveline vibration. Anyone restoring their CJ5 with the GM engine or driving it off-road should check these often-overlooked wear parts.
- Clutch: The clutch pilot bearing for the SR4 transmission sits centered in the crankshaft.
- Engine Lubrication: The matching oil filter with the correct thread size for the GM engine.
- Engine & Transmission Mounting: The motor mount, left or right, and the rear transmission mount dampen driveline vibration.
- Gaskets: The upper engine gasket set reliably seals the valve cover, intake manifold, and carburetor flange.
- Transfer Case Mounting (Dana 300): The transmission insulator bushing and matching transmission insulator stud secure the torque arm on the Dana 300 transfer case.
American Brand Quality for the GM Engine.
Pilot bearing, oil filter, engine and transmission mounts, and the Dana 300 transmission insulator come from Crown Automotive – a name that stands for American engineering expertise in Jeep parts. The engine gasket set comes from Rugged Ridge, a brand of Omix, also of American origin.
Your Partner for the GM Engine in Your CJ5.
Whether you need a single wear part or a complete engine mount overhaul, we're happy to advise you on installation position, torque values, and how to tell the GM engine apart from the similar-looking AMC engine, so you order the right parts. Your order ships from our warehouse as fast as possible, so your CJ5 is back on the road in no time.