In this issue:

2.5 Liter Twin Cam: Engine Valve Adjustment

The first versions of the 2.5 liter twin cam engines employed non-hydraulic valve actuation. Like the timing belt, the clearance between the engine valves and the shim and bucket valve actuators does not require inspection and/or adjustment until 105,000 miles have elapsed. However, various circumstances may require an adjustment before that milestone is reached.

2.5 Liter Twin Cam: Timing Belt Replacement

On most overhead cam engines, a timing belt replacement is a pretty straightforward procedure: You take the old belt off, make sure the timing marks are lined up, then you put the new belt on. You’ve probably replaced more timing belts during your career than you could count, and most of them probably fall into the same ho-hum category. But there are some engines out there that demand your full attention. We call these engines interference engines, an innocent sounding term that understates the importance of the matter at hand.

Insider Info:

• On-Board Diagnostic System Check During State Emission Test
• Ten Year SRS Inspections
• OBD Check During State I/M Programs
• Keyless Entry Battery Replacement
• Magnetic Tip Screwdriver Caution
• Freeze Frame Data
• Engine Noise When Cold
• Daytime Running Lights
• Don’t Touch That Screw!
• Second Generation 4EAT Trouble Codes