Truck Engine Inspection Borescope Series | Ralcam

Built for Diesel and Heavy-Duty Engines

Heavy engine work changes the sizing math. Injector bores and glow plug ports are wider than automotive spark plug wells, cylinders are deeper, and you are often working around a frame rail rather than over an open bay. That points to a larger probe on a longer, stiffer cable.

Probe and cable sizing

8.5 mm is the workhorse diameter for diesel — it carries brighter LEDs and a larger sensor, which matters in a soot-darkened cylinder. Semi-rigid cable in 1 m, 2 m, or 3 m lets you push the tip in and have it stay put; 3 m covers the reach on inline-six and larger V-block engines. Where access is tight, a 6.2 mm probe on the same platform gets you in.

What technicians check

Cylinder wall glazing and scoring before a rebuild quote, valve and seat condition on high-hour engines, injector tip carbon, EGR cooler fouling, turbo housing and impeller damage, and DPF face condition — all without teardown, and all recordable to a TF card for the work order.

Related

For passenger-car sizing see automotive borescopes. For methodical chamber sweeps, 4-way articulating models give full 360° tip control.