Caterpillar & International
Cat's C15, C13, and 3406 are legacy platforms still running strong in a lot of fleets, and overhaul and rebuild demand is high as they age. International's A26 is a different engine entirely, with its own EGR cooler and DEF header issues we watch for.
- Displacement
- 15L / 12.5L / 14.6L (Cat C15/C13/3406) · 12.4L (International A26/MaxxForce)
- Common in
- Legacy fleets, glider kits (Cat); International LT/LoneStar (A26)
Known failure signature
- Cat C15/C13/3406 — an aging platform with heavy overhaul and rebuild demand as units run past their original service life
- International A26 EGR cooler cracking — the same failure pattern we check for on other platforms
- International A26 DEF header issues — a known derate trigger on this engine
Services we perform on this platform
Engine Overhaul
In-frame means rebuilding the pistons, liners, rings, and bearings without pulling the engine from the truck. Out-of-frame means pulling it and machining the block. Which one you need depends on what the wear pattern actually shows, and we explain the difference before you commit to either.
Learn more Emissions
EGR Valve & Cooler Repair
White smoke at startup and coolant that disappears without a visible leak is the classic sign of a cracked EGR cooler letting coolant cross into the exhaust. We pressure-test the cooling system to confirm it before anything comes apart.
Learn more Emissions
DEF & SCR System Repair
A DEF quality fault or an SCR efficiency code usually comes down to one of a handful of things — bad fluid, a failing sensor, a frozen line, or the catalyst itself losing efficiency after years of duty. We test each one separately instead of replacing parts until something clears.
Learn more Engines
Diesel Engine Repair
A diesel engine problem is rarely simple — it's cylinder head, fuel system, turbo, or something deeper, and the fix ranges from a single component to a full overhaul. We diagnose first, then tell you honestly whether it's worth repairing, overhauling, or replacing.
Learn more
Diagnostic tools we use
Common questions
Do you still work on older Cat C15 engines?
Yes — this is one of the platforms we see the most overhaul and rebuild demand on.
What's different about the International A26?
It’s a distinct engine from the older MaxxForce, with its own EGR cooler cracking and DEF header issues we specifically check for.
Is a Cat overhaul different from a newer engine's overhaul?
The core process is the same — in-frame vs. out-of-frame — but parts availability and machining needs can differ on a legacy platform. See /services/engine-overhaul.
What diagnostic tool do you use for these platforms?
JPRO covers both platforms well for our diagnostic needs.
Ready when you are
Call now or send a quote request — we’ll tell you what it takes to fix it.