How do I know if my engine needs a rebuild?

High blow-by, low compression, oil consumption and internal noise are signs. Testing confirms whether a rebuild is necessary.

What's the difference between an overhaul and a rebuild?

The terms overlap. An in-frame overhaul typically replaces wear parts with the engine in place; a rebuild often means removing the engine for a fuller job.

Why is there coolant in my oil?

Coolant in the oil usually means a head gasket, oil cooler or liner seal failure. It needs prompt attention — coolant destroys bearing surfaces quickly.

Do you work on equipment engines?

Yes. Industrial and equipment engines — Deutz, Perkins, Kubota and others — get the same diagnostic approach as truck engines, from no-starts and fuel problems to overhauls.

Glendive, Montana

Diesel Engine Repair, Rebuild & Overhaul

Engine repair starts with knowing what is actually wrong. Mondak diagnoses diesel engines in trucks and equipment for loss of power, blow-by, oil consumption, coolant in the oil, hard starting, smoke and noise. Testing may include compression or cylinder cutout checks, crankcase pressure, fuel and air system checks, turbo inspection and oil or coolant analysis. From there we recommend the right path: targeted repair, cylinder head work, in-frame overhaul, rebuild, or replacement. Engines we work on include Cummins, Cat, Detroit, John Deere, Deutz, Perkins, Kubota, Ford Industrial, Mitsubishi and Nissan.

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Repair

Engine Repair, Rebuild & Overhaul

WHAT WE SERVICE

Work tied to the actual fault.

Power loss, smoke and hard-start diagnosis
Compression, blow-by and crankcase pressure testing
Fuel system and air intake checks
Turbocharger inspection and replacement
Cylinder head and gasket repair
In-frame overhaul and rebuild planning
Engine replacement when repair isn't practical

COMMON NEEDS

Excessive blow-by or oil out the breather
Coolant in oil or oil in coolant
White, blue or black smoke
Knocking or new engine noise
Low power with no obvious fault code
High oil consumption

THE MONDAK APPROACH

Diagnose first. Repair with purpose.

Before recommending a rebuild, we confirm the condition. A turbo or injector problem can look like a tired engine. When internal damage is confirmed, we explain repair, overhaul and replacement options with cost and downtime so you can choose.

Initial diagnostics can sometimes happen in the field. Engine teardown and overhaul happen in the shop.

RELEVANT EQUIPMENT & BRANDS

CumminsCaterpillarDetroitJohn DeereDeutzPerkinsKubotaFord IndustrialMitsubishiNissan

Brand references indicate service familiarity, not authorized dealer or factory status.

COMMON QUESTIONS

Questions about engine repair, rebuild & overhaul

Cooling System Repair Truck Diagnostics Heavy Equipment Repair Advanced Diagnostics Semi Truck Repair

GLENDIVE, MONTANA

Tell us what’s down.

Share the unit, location and symptoms. We’ll help determine the practical next step.

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