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Truck and engine maker Navistar International Corp. said its fiscal fourth-quarter profit fell to $39 million from $86 million last year, as costs related to engine development and a new labor contract with United Auto Workers chipped away at results.

HUNTSVILLE, Ala. — Navistar Inc. opened its new heavy-duty engine plant to journalists last week, showing where 114 employees are currently churning out 125 13-liter MaxxForce power plants a day.

Navistar International Corp. employees represented by the United Auto Workers union approved a new four-year contract, the company said.

Navistar International Corp. and the United Auto Workers union have reached a tentative agreement on new four-year labor contracts, the company said.

Navistar International Corp. sent layoff notices to about 250 workers at an Ohio truck assembly plant, the Springfield (Ohio) News-Sun reported.

United Auto Workers members continue to make trucks and engines for Navistar Inc. even though their old contract expired Oct. 1, both parties said, adding that they are still in active negotiations.

United Auto Workers employees at Navistar International Corp. remain on the job following Friday’s expiration of a contract between the two sides, news services reported.

A Navistar International Corp. affiliate and a Chinese firm have signed a joint venture agreement to develop, build and market advanced commercial diesel engines in China.