Navistar International Corp. scheduled a conference call late last week with stock analysts, saying it would provide an “operational update” as rumors swirled about the truck manufacturer’s inability so far to offer a heavy-duty engine that can meet federal emissions standards without using credits built up with the Environmental Protection Agency.

Navistar International Corp. said Friday it will offer a new engine technology to meet federal and state emission rules by using a new, urea-based system for aftertreatment.

Navistar International Corp.’s board of directors last week moved to block a potential hostile takeover, as the truck maker tries to restore profitability and awaits Environmental Protection Agency approval for its new 13-liter engine.

German automaker Volkswagen AG is weighing a possible stake in U.S.-based truck manufacturer Navistar International Corp., with an eye on competing in the North American heavy-truck market, a German newspaper reported last week.

Navistar International Corp. reported a second-quarter loss and said company executive Troy Clarke will head its truck and engine operations, in a newly created position.

WASHINGTON — If the Environmental Protection Agency had not taken a shortcut in writing a regulation allowing Navistar Inc. to pay penalties in order to sell engines that exceed 2010 emissions standards, the truck manufacturer would have had to stop selling the engines, a federal attorney said in court.

Navistar has issued a recall for 21,831 International brand trucks to check for a possible defect that could cause an alternator cable to chafe and potentially lead to an electrical short.

Navistar Defense LLC said it received a $21 million contract from the U.S. Army for more work connected to a January order to upgrade 2,717 MaxxPro Mine-Resistant Ambush-Protected vehicles.

LOUISVILLE, Ky. — Navistar Inc. made a big push for natural gas at the Mid America Trucking Show, being held here this week.