Deeper into the Trenton Engine Plant changes

Recently, Stellantis announced that it would be consolidating the manufacturing part of Trenton Engine in the South plant and likely using the North plant for materials handling and possibly other purposes.

Trenton Engine

Today, we will go into some of the details. First, though, it is important to note that Trenton Engine has two buildings, North and South, which share a parking lot. They are near I-75 and MI-85, close to the Detroit River, and a reasonable distance from Detroit.

The changes, which our informal source called “rearranging the furniture,” will cost around $25 million. This may seem fairly expensive, but it’s a reasonable price for the amount of work. The flexible block line in the North plant is reportedly leaving; we could not confirm this, but we were told it is not going to Europe. The parts lines (for heads, blocks, and crankshafts) and engine assembly line in North will move to South; while logistics for incoming engine parts will be in the North plant.

Pouring concrete at Trenton Engine
Pouring concrete at Trenton Engine, circa 2000

When they are finished, the southern plant will make two variations of the 3.6 liter V6 engine and various parts. The changes are scheduled to take around three months, with our informal source saying that it will be scheduled for the end of 2022. That is, according to our source, a fairly aggressive timeline for what needs to be done. In the end, the remaining plant will be flexible and efficiently laid out.

A stockpile of V6 engines is being built now to keep things going at the assembly plants. Dundee also makes upgraded Pentastar engines (PUGs) alongside its four-cylinders.

The investment is good news for employees at the Trenton Engine plant, given that one prior rumor had it closing in mid-2023—which is a good reason not to believe every rumor that floats around; similar rumors were circulating at the Brampton plant until the day Stellantis announced investments and upgrades.

Historical Trenton Engine stories and pictorials at

3 thoughts on “Deeper into the Trenton Engine Plant changes”

  1. I had a tour of Trenton Engine back when it was making 2.2L engines in the mid 1980s, given by the plant manager. It was a fascinating place overall, but the thing that stands out in my memory was the hot test stations, where they would run each engine after it was built on natural gas. Ones that didn’t run well were shunted to a repair line, while the ones that were fine were sent off to shipping. We followed the repair line; there was a case where one of the engines was misfiring. The tech backed out the spark plugs and found the one with the bent electrode. I’m sure the plant has been revamped several times over since then, but I’m also sure it is still equally fascinating. Thanks for this type of coverage.

  2. Can you give us an article with all the engine and transmission plants and what they make currently? I curious where all the aisin transmissions are made, and if Dundee still makes the WGE 2.0 for export markets. Also, is the 3.0 Pentastar still used in export markets?

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