line boring mains

[Hammerhead]

(08-15-2017 )Rawze Wrote:  Laser deposition and re-machining is the only sure-fire correct way of such repairs...

Quote:The Cummins Remanufacturing Process

Disassembly – Engines and parts are completely disassembled with great care to protect and prepare key components for processing – right down to the last screw, nut, bolt and spring.

Cleaning – Each part is carefully cleaned using the latest technology to remove debris without removing any metal, including the use of dry ice, enzymes and lasers for specialized cleaning needs.

Inspection – The latest technology, including ultrasonic inspection, is just one of the many methods used to verify that every ReCon part meets original factory specifications.

Restoration – Cummins uses a variety of techniques to ensure that parts meet original specifications or improved standards of performance.

Worn surfaces are restored with thermal spray and laser deposition

Computer-controlled lathes and machining centers, together with advanced honing and grinding equipment, renew worn bores, shafts and critical component profiles
If a part doesn’t meet specifications, it is scrapped and replaced with a new Genuine Cummins part
Any upgrades or supercessions that have taken place in the years since the original part was made will be included as part of the Cummins remanufacturing process
State-of-the-art techniques are used to achieve consistent quality in assembly

Testing – Validation testing using fail-safe processes verifies that the performance and reliability of the finished product meet Cummins standards.

reference: https://cumminseurope.com/engines/recon-engines

The big red engine manufacturer sure has a stated high standard for their reman process, so this begs the question "Why can't even they produce a quality Genuine OEM ReCon head?"
My only conclusion is that the OEM New Production is of such insufficient quality that it isn't capable of quality restoration...