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Precision Diesel Machining — home (937) 394-2150
A freshly machined cylinder head deck, its counterbored cylinder openings and bolt holes catching raking light.

Precision Diesel Machining · Sidney, OH

Built on experience.
Measured by precision.

Full-service engine rebuilding for automotive, agricultural, heavy-duty truck and industrial work across western Ohio and central Indiana.

(937) 394-2150 or request a quote →
Journal runout & taper±0.0001″
Years rebuilding engines30+
Markets served4
Services15
02What we offer

Fifteen services. One standard.

From a single valve job to a complete rebuild — every part is inspected carefully, machined precisely, and restored to meet or exceed original manufacturer specifications.

01Complete cylinder head rebuildingValve jobs with 3-angle seats, precision-ground valves, clean-room assembly.View process →02Engine block rebuildingBore, deck and hone indexed to a true deck-to-cylinder-to-main relationship.View process →03Engine assemblyAssembled by a specialist in a dedicated clean room, isolated from the shop floor.View process →04Complete engine rebuildsTeardown to assembly, with premium first-line parts and gaskets.View process →05Boring & honingCorrect cylinder wall finish and crosshatch for ring break-in and oil film.View process →06Crankshaft grinding & polishingJournals held to ±0.0001″ runout and taper — often no detectable deviation.View process →

All fifteen services →

A bare V8 engine block on a steel cart on the open floor of PDM's machine shop in Sidney, Ohio.
01The shop floor, Sidney, Ohio
03Our process

Three stages. Dedicated areas.

From shop design to machine selection, PDM is structured around the three critical stages of rebuilding — so engines move through each with the care, cleanliness and accuracy they require.

  1. 01
    Teardown & cleaning

    Complete disassembly, thermal and hot-tank cleaning, and inspection before any metal is cut.

  2. 02
    Precision machining

    Boring, honing, grinding and align boring — every cut indexed to a true relationship.

  3. 03
    Final assembly

    Careful assembly in a dedicated clean room, isolated from the rest of the operation.

Runout & taper, held
±0.0001″
  • Magnaflux magnetic-particle inspection
  • Pressure testing
  • Closed-loop, self-contained degreasing
  • Dedicated assembly clean room
  • Premium first-line parts & gaskets
  • Delivery & pickup on established routes

Put dependable power back to work.

One call. Same-day answers. (937) 394-2150
or
Request a quote