Blocks & rotating assembly · Glendale, Arizona
Crankshaft Polishing
Crankshaft polishing concerns journal surface condition. It is not a substitute for correcting an unsuitable journal size through grinding.
What this service addresses
A crankshaft being reused in a build may need its journal surface considered along with wear and bearing fit. Polishing is a narrower request than grinding, and a cleaner-looking surface does not prove a crank is suitable for assembly. Copper State Machine Shop offers crankshaft polishing for gas and diesel engines. Describe the damage and the intended bearings before assuming a polishing-only job is enough.
Before deciding on the work
- Journal size and wear need consideration even when the primary concern looks like surface damage.
- Deep scoring or geometry problems may fall outside the scope of a polishing-only job.
- Bearing choice and any previous grinding history help frame whether the crank can be reused as planned.
What to bring or include
- The crankshaft and engine identification, plus previous machining information if known.
- Details of the bearings you intend to use and any journal measurements already available.
- Notes on the reason for removal and whether the engine suffered a bearing or oiling failure.
Planning the job
- 01
Describe the surface concern and the crank’s service history.
- 02
Discuss journal condition and whether polishing alone matches the rebuild requirements.
- 03
Confirm the polishing scope and any other crank work needed before choosing bearings and preparing for assembly.
Crankshaft Polishing: common questions
Will polishing fix a worn-out journal?
Polishing addresses surface condition. Wear affecting journal size or geometry needs a separate discussion about grinding and bearing fit.
Is polishing included with grinding?
Include both grinding and polishing in your quote request if you want them considered together. Tell us about journal wear and the bearings you intend to use.
Can I request polishing only?
Yes. Bring your crankshaft for polishing as a standalone job. Its journal condition and your bearing plan determine whether additional work needs discussion.
Should I bring the bearings?
Bring any parts already selected and their information so the crank-service request can be discussed in context.