This week, the overall grades of 3 Machinery stocks are lower, according to the Portfolio Grader database. Each of these rates a “D” (“sell”) or “F” overall (“strong sell”).

China Yuchai International Limited (CYD) experiences a ratings drop this week, going from last week’s D to a F. China Yuchai International Limited is engaged in a diesel engine manufacturer in China, and produces diesel power generators and diesel engine parts. The company also gets F’s in sales growth, earnings growth, and earnings revisions. For more information, get Portfolio Grader’s complete analysis of CYD stock.

ExOne Co. (XONE) gets weaker ratings this week as last week’s D drops to a F. The company also gets F’s in earnings revisions, earnings surprise, return on equity, and free cash flow. For more information, get Portfolio Grader’s complete analysis of XONE stock.

Titan International, Inc. (TWI) earns a F this week, moving down from last week’s grade of D. Titan International, Inc. manufactures wheels, tires and assemblies for off-highway vehicles used in the agricultural, earthmoving/construction and consumer markets. The company also gets F’s in sales growth, earnings revisions, earnings surprise, return on equity, and free cash flow. For more information, get Portfolio Grader’s complete analysis of TWI stock.

Louis Navellier’s proprietary Portfolio Grader stock ranking system assesses roughly 5,000 companies every week based on a number of fundamental and quantitative measures. Stocks are given a letter grade based on their results — with A being “strong buy,” and F being “strong sell.” Explore the tool here.