Standby, prime and continuous power turbo rebuilds

3400 Series (3406, 3408, 3412)

Caterpillar

The 3406, 3408 and 3412 powered a generation of standby and prime gensets from 200 to 800 kW. Garrett and Schwitzer/BorgWarner turbos by rating: GT47 and GT55 on the larger 3412 configurations, S4D-class BorgWarner on the 3406B/E. These engines are legacy but still ubiquitous, and complete turbo assemblies through Cat channels are increasingly scarce and expensive.

3500 Series (3508, 3512, 3516)

Caterpillar

The heavy industrial workhorse: 3508 V8 at 700 to 1,100 kW, the 3512 V12 covering the 1,000 to 1,750 kW data center and hospital segment, and the 3516 V16 up to 2,500 kW. Multiple turbos per engine, Garrett and Schwitzer/BorgWarner by vintage and rating. Cat 3516 turbo assemblies list over $8000 each (Cat PN 210-4742 on record at that price). Rebuilding is the economic answer.

C-series industrial (C9, C13, C15, C18, C27, C32)

Caterpillar

The modern Cat genset line: C9 with BorgWarner S310CG (13809880113), C13 and C15 running ACERT-family hardware, C18 with Garrett GT5518, C27 and C32 with larger Garrett and BorgWarner units. These are the Tier 4 Final successors to the 3400 series for new North American installations.

QSK, QST, QSX and ISX genset power

Cummins

Cummins genset engines run Holset turbos across the range: QSK23, QSK45, QSK60 and QSK78 cover the 750 kW through 2,500 kW band with HX-series and HE-series Holset hardware. The same Holset families we rebuild for Cummins on-highway and marine, on the same bench.

Other OEM genset power

Kohler + MTU

Kohler generators run a mix of Kohler-branded engines (with Garrett and BorgWarner turbos) and Volvo Penta genset power. MTU/Rolls-Royce Power Systems generators run their own turbo configurations. Send tag photos through the repair form and we will identify any genset turbo.

Why genset operators rebuild

The Economics

A failed standby generator turbo at a hospital is a compliance emergency. A failed prime power turbo at a remote site stops everything. Dealer lead times for complete Cat 3500-series turbo assemblies can run weeks and cost five figures per unit. Rebuilding your core cuts both the time and the cost, and our priority turnaround serves the urgency these failures demand.

Standby seal hardening from sitting

Standby generators sit for months between real events. Seals harden, and the first full-load run smokes. If exercise cycles never bring the unit to operating temperature, the problem compounds. Scheduled assessment during maintenance windows catches it before the outage does.

Low-load carbon buildup

Exercise runs at 30% load never bring the turbo to self-cleaning temperature. Carbon accumulates in the turbine housing and on VGT vanes. Prime-rated generators that actually work avoid this entirely; standby units that only exercise are the vulnerable ones.

Oil coking from extended drain intervals

Genset oil change intervals are often set by hours, and many facilities stretch them. High-hour prime power units coke their center sections the same way any diesel does, and the next cold start starves the bearings. Clean oil at sensible intervals is the cheapest turbo protection.

VGT sticking on tier 4 gensets

Modern C-series Cat gensets with variable geometry turbos suffer the same carbon-stuck vanes as on-highway trucks, triggering derates during the load event the generator exists to cover. Mechanism cleaning restores most of these without a full assembly.

Vibration from engine and mounting

Generator sets transmit vibration through their skid and isolators differently than mobile equipment, and turbo bearing wear from vibration fatigue shows up on high-hour prime power units. VSR balancing on every rebuild ensures the turbo is not contributing its own vibration.

Emergency demand on neglected hardware

The worst genset turbo failures arrive during the events that matter most: hurricanes, grid failures, and facility emergencies. The turbo that was not assessed during the last PM cycle is the one that fails under load when the building needs it. Proactive assessment is the fix.