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The RI-9000 Series rod indicator from Tobin Arp / Sunnen is a precision measuring instrument designed to check connecting rod geometry, alignment, and bearing clearance — critical for rebuilders, remanufacturers, and engine-build shops that demand tight tolerances and repeatable rod/shaft inspection. As a used unit, the RI-9000 provides a cost-effective way to add or upgrade rod-checking capability in your shop without the expense of a new system.
Used properly, it helps ensure that rod bearing surfaces, alignment, and concentricity meet spec — reducing risk of bearing misload, early wear, or engine failure. For shops doing frequent rod rebuilds, performance engines, or mixed-volume work, having a dedicated electronic rod indicator supports quality control and consistency.
Precision Electronic Measurement — Designed to measure rod straightness, runout, alignment and bearing journal geometry with accuracy greater than manual methods.
Versatile for Multiple Rod and Shaft Sizes — Adjustable fixtures accommodate a variety of connecting rod lengths, sizes, and bearing configurations (automotive, diesel, industrial).
Repeatable & Reliable Results — Provides consistent readings for each rod — ideal for quality control, rebuild shops, and remanufacturers seeking repeatability across batches.
Compact & Shop-Friendly Design — Smaller than full-scale engine-inspection rigs; suitable for bench-top or shop-floor use with moderate footprint.
Cost-Effective Used Equipment Upgrade — Offers high-accuracy inspection capabilities at a much lower cost than new instruments — good for shops adding quality-control without big investment.
Enhances Build Quality & Reliability — By verifying rod alignment and bearing geometry before assembly, reduces risk of bearing or crank failures, improving long-term engine reliability.
| Specification | Value |
|---|---|
| Model | Tobin Arp / Sunnen RI-9000 Series Electronic Rod Indicator (Used) |
| Purpose | Electronic measurement of connecting rod alignment, straightness, bearing journal geometry & runout |
| Suitable For | Connecting rods — automotive, diesel, industrial; shafts and journal-type parts needing straightness/geometry verification |
| Use Cases | Rod rebuilds, performance engine builds, quality control inspection, remanufacturing, batch rod work |
| Advantages | Accurate electronic measuring, repeatable results, flexible size compatibility, compact shop size, cost-effective used option |
| Limitations / Notes | Manual setup and calibration required; accuracy depends on proper fixturing and maintenance; check sensors & calibration before use. |
Tell us what you need, and we’ll send you a quick and accurate estimate — no hidden fees, no obligations.
We make equipment decisions easy. Clear answers, accurate recommendations, and support from people who know the industry.
When you reach out, you get answers quickly - not generic replies.
Backed by 50+ years in engine machining and reconditioning.
No surprises, no unclear timelines.
Your machine’s long-term performance is our priority.
Decades before today’s engine shops trusted our equipment, Tony was already deep in the craft — rebuilding motors, machining blocks, and pushing for better precision.
A local newspaper once featured him as a standout young machinist, noting his drive, attention to detail, and obsession with doing things the right way. That same passion would eventually shape our company’s values.
Today, that commitment lives on in every machine we sell, every customer we support, and every shop we help succeed.