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§Equipment
Buses and motorcoaches
Engine machining for school, transit and motorcoach fleets.
The work
Buses and motorcoaches
Bus fleets plan their maintenance around a calendar that does not move, and they keep vehicles far longer than most operators — which makes a machined rebuild the economic answer well past the point where a replacement engine stops making sense.
PDM takes heads, blocks and rotating assemblies from transit, school and motorcoach fleets and works to a scheduled date agreed at quote.
Manufacturer names are used to describe the engines PDM machines and rebuilds. PDM is an independent machine shop and is not affiliated with, endorsed by, or an authorised dealer for any manufacturer named on this page.
→Services
Machined here.
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 →