The J-46303 Cam Lash Checking Fixture is the professional diagnostic tool for precise, repeatable measurement of camshaft/valve lash on Detroit Diesel Series 60 engines—ensures accurate valve adjustment, optimal combustion, reduced wear, and prevention of power loss or emissions issues.

The High Costs of Inaccurate Cam Lash on Detroit 60 Series Engines

Improper or inconsistent valve lash measurement leads to tight/loose valves, poor combustion, excessive cam/rocker wear, power loss, increased fuel consumption, emissions failures, and accelerated valve train damage.

• Valve train wear / cam lobe damage – $1,500–$5,000 rocker & cam replacement
• Poor performance & fuel economy – $2,000–$8,000 excess fuel over time
• Emissions / fault codes – $1,000–$4,000 diagnostics & EGR/aftertreatment fixes
• Top-end rebuild / head work – $4,000–$12,000 premature service
• Downtime & lost revenue – 3–10 days truck out ($800–$2,500/day)
• Rework after bad adjustment — Extra 10–30 hours labor at $150–$350/hr

What is the J-46303 Cam Lash Checking Fixture?

The ATC J-46303 Cam Lash Checking Fixture is a precision holding fixture designed to position feeler gauges or dial indicators accurately against the cam lobe and rocker arm for consistent, repeatable valve lash measurement on Detroit Diesel Series 60 engines.

Essential for diesel shops, fleets, and rebuild facilities, it eliminates hand-held guesswork, ensures factory-spec adjustments, reduces wear, improves performance, and prevents costly comebacks on 11.1L, 12.7L, and 14L Series 60 platforms.

Complete Tool Specifications & Series 60 Compatibility

Professional Features & Valve Train Benefits

Economic Impact: J-46303 ROI for Shops

Scenario	Cost Impact
J-46303 accurate lash check	Tool – $175.00 investment
Valve train / cam repair	$1,500–$5,000
Premature top-end rebuild	$4,000–$12,000
Fuel & emissions penalties	$2,000–$8,000
Total lash error cost	$7,500–$25,000 per engine
J-46303 ROI (first prevention)	43–143X return on investment

When Detroit 60 Series Techs Choose J-46303

• Detroit Series 60 valve lash adjustment
• Series 60 top-end service & overhaul
• Cam lobe & rocker arm diagnostics
• Freightliner / Western Star fleet maintenance
• Diesel engine rebuild shops
• Precise valve train setup
• Emissions & performance compliance

Why Series 60 Pros Trust J-46303

Detroit 60 specialists choose the J-46303 for its stable platform, repeatable readings, and ability to avoid $7.5K–$25K in wear, rebuilds, and downtime from bad lash settings. It delivers factory-spec accuracy and confidence in every adjustment.

From long-haul fleets to engine bays, this fixture keeps valve trains tuned and engines efficient.

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