The ATC 85109245 Crankshaft Turning Barring Tool is the professional standard for controlled rotation on Volvo D11/D13 and Mack MP7/MP8 engines—engineered for precise alignment, timing, and inspection without the risk of component damage.

The High Cost of Improper Engine Rotation

Attempting to rotate a Volvo D13 or Mack MP8 using the starter motor or pry bars is a recipe for disaster. Precise timing work requires fine adjustments that only a dedicated barring tool can provide.

• Damaged Crank Pulley – Improper leverage can mar pulley surfaces, leading to belt wear ($400–$900).
• Timing Misalignment – Missing TDC by just a few degrees can cause valve-to-piston contact ($5,000–$12,000).
• Starter Motor Burnout – Using the starter for "bumping" shortens component life ($600–$1,200).
• Workplace Injury – Slipping pry bars are a major safety hazard in heavy-duty shops.
• Lost Labor Efficiency – Struggling to align marks manually wastes 2–4 hours per service.

What is the 85109245 Crankshaft Turning Tool?

The ATC 85109245 Crankshaft Turning Barring Tool is a precision-machined adapter that seats directly into the crank pulley hub. It allows a technician to use a standard drive tool to rotate the engine in single-degree increments, providing the control needed for camshaft alignment, valve lash adjustments, and TDC verification.

Technical Specifications & Compatibility

Professional Benefits for Diesel Technicians

Economic Impact: 85109245 ROI

Scenario	Cost Impact
ATC 85109245 Tool Purchase	$175.00 investment
Damaged Timing Gear/Valves	$5,000–$12,000
Pulley/Crank Hub Replacement	$800–$1,500
Total Improper Rotation Risk	$5,800–$13,500 per incident
85109245 ROI (First Prevention)	33–77X Return on Investment

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