For many machine shops, a crankshaft grinder is one of the most important pieces of equipment on the floor. Some grinders have provided decades of reliable service, helping rebuild thousands of engines and keeping shops productive year after year.

However, every machine eventually reaches a point where repairs become more frequent, downtime increases, and maintaining accuracy becomes increasingly difficult.

If you’re constantly debating whether to repair or replace your crankshaft grinder, here are seven signs it may be time to invest in new equipment.

1.  Accuracy Is Becoming Difficult to Maintain

The primary purpose of a crankshaft grinder is precision.

If operators are spending more time checking dimensions, making adjustments, or reworking crankshafts to meet specifications, the machine may be showing signs of wear.

Common indicators include:

• Inconsistent journal sizes
• Difficulty holding tolerances
• Surface finish issues
• Increased scrap rates
• Excessive setup adjustments

As machine components wear over time, maintaining the accuracy required by modern engines becomes increasingly challenging.

2.  Downtime Is Increasing

Every hour a grinder sits idle costs money.

When repairs become routine rather than occasional, production schedules begin to suffer.

Warning signs include:

• Frequent hydraulic issues
• Electrical failures
• Control system problems
• Recurring spindle repairs
• Unplanned breakdowns

Many older machines remain operational only because skilled technicians continue finding creative ways to keep them running.

Eventually, downtime becomes more expensive than replacement.

3.  Replacement Parts Are Hard to Find

One of the biggest challenges facing owners of older crankshaft grinders is parts availability.

Many legacy machine manufacturers no longer exist or no longer support their equipment.

Shops often find themselves searching for:

• Obsolete electronics
• Hydraulic components
• Specialty bearings
• Drive motors
• Mechanical assemblies

When locating parts becomes a project of its own, it’s worth evaluating whether continued repairs make financial sense.

4.  Skilled Operators Are Retiring

Many older crankshaft grinders require years of experience to operate efficiently.

As veteran machinists retire, shops face the challenge of training new employees on increasingly outdated equipment.

Modern grinding machines are designed to improve consistency, simplify operation, and reduce dependence on tribal knowledge.

If only one person in the shop knows how to run your grinder, that’s a risk worth addressing.

5.  Production Demands Have Increased

The grinder that met your needs twenty years ago may not support today’s workload.

As customer demand grows, many shops discover they need:

• Faster setup times
• Improved throughput
• Greater repeatability
• Reduced manual adjustments
• More reliable operation

When your grinder becomes a bottleneck, replacing it can significantly increase shop productivity and profitability.

6.  Repair Costs Keep Climbing

A good rule of thumb is simple:

If you’re investing substantial money into repairs every year without improving reliability, it may be time to consider replacement.

Many machine shops reach a point where they have spent enough on repairs to make a significant down payment on a new machine.

Instead of investing in old technology, that money may be better spent on equipment that improves production and accuracy.

7.  You’re Planning for the Next Generation of Your Shop

The most successful machine shops don’t wait for catastrophic failure.

They plan ahead.

Replacing critical equipment before it becomes a major problem allows owners to:

• Avoid emergency downtime
• Train operators gradually
• Improve production efficiency
• Expand capabilities
• Position the business for future growth

Investing in new equipment is often less about today’s workload and more about preparing for tomorrow’s opportunities.

Repair or Replace?

Every machine shop eventually faces the same question:

Should we keep repairing our current grinder, or is it time to replace it?

While repairs may make sense in the short term, there comes a point when a newer machine delivers greater value through improved accuracy, reliability, productivity, and support.

The goal isn’t simply keeping a grinder running.

The goal is keeping your business competitive.

Looking for a New Crankshaft Grinder?

Winona Van Norman manufactures precision crankshaft grinding machines in Wichita, Kansas and supports customers throughout North America and around the world.

If you’re evaluating the cost of repairing an aging grinder versus investing in a new machine, our team can help you compare options and determine the best solution for your operation.

Melissa Gibson, Sales Manager