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The Sunnen CRG-750 is a well-known, compact rod and cap grinder built for precision grinding and resurfacing of connecting rods, bearing caps, journal caps, and various small-to-mid sized machined components. This listing includes the additional main-cap attachment, which expands the grinder’s capability — allowing resurfacing of main bearing caps, bulk-engine cap sets, and larger machined surfaces, adding versatility to the core CRG-750 platform.
As a used unit with the main-cap fixture, this setup offers an excellent value for machine shops, engine-rebuilder shops, or remanufacturers looking for a flexible grinder capable of rod/cap work and main-cap resurfacing — without investing in a full-size industrial grinder. Its manageable footprint, established build quality, and adaptability make it a solid mid-tier machine for rebuild shops, performance shops, or mixed-workload environments.
Includes Main-Cap Grinding Attachment — Expands standard rod/cap capability, enabling main bearing cap resurfacing, bulk-cap sets, and larger surfaces beyond just rods and small caps.
Precision Hardened Face Plate — Provides a stable, flat grinding surface to ensure accurate, repeatable results across rods, caps, and main caps.
Compact & Shop-Friendly Footprint — Smaller and easier to accommodate than large industrial grinders; ideal for medium-size shops, rebuild bays, or mixed-use engine shops.
Versatile Application Range — Suitable for connecting rods, rod caps, main bearing caps, journals, small shafts, and many other machined components — useful across automotive, performance, diesel-reman, and light-industrial work.
Durable, Shop-Duty Construction — Built with heavy-duty housing, vibration-dampened drive, and reliable components, engineered for repeated use in busy engine shops.
Cost-Effective Used Equipment Option — Offers many capabilities of larger rod/cap-and-cap-set grinders at lower acquisition and operating cost — good for shops expanding capabilities or adding rebuild services.
Flexible for Small- to Mid-Volume Work — Great for rebuild shops, custom engines, rod/cap sets, main-cap resurfacing — especially when volume doesn’t justify a large dedicated grinder.
| Specification | Value |
|---|---|
| Model | Sunnen CRG-750 Rod & Cap Grinder (Used) + Main-Cap Attachment |
| Grinding Surface | Factory-hardened face plate (precision ground) |
| Wheel Size | Typical Ø ≈ 6″ (150 mm) wheel — standard for CRG-750 series |
| Power Supply | 115 V, single-phase (standard configuration) |
| Supported Work Types | Connecting rods, rod caps, main bearing caps, journal caps, small shafts, machined components |
| Construction | Heavy-duty steel housing, vibration-dampened belt drive, robust build for shop use |
| Applications | Rod/cap resurfacing, main-cap sets, journal/shaft cap work, custom rebuilds, small-batch production |
| Ideal For | Engine rebuild shops, remanufacturing shops, performance shops, mixed-use machine shops |
| Advantages | Expanded capability (rods + main caps), precision grinding, compact footprint, cost-effective used equipment |
| Limitations | Best suited for small-to-mid size caps/rods; may not be ideal for heavy-duty or large industrial crankshaft components |
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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.