An inframe kit lets you rebuild a diesel engine without pulling it out of the truck. Picking the right kit saves time, avoids returns and helps the rebuild last. This guide covers what a kit includes, how to match it to your engine and the mistakes to avoid.
Inframe vs Out-of-Frame Rebuild
An inframe rebuild is done with the engine still in the chassis. The oil pan and head come off, and the pistons and liners are replaced from above and below. It is faster and cheaper than an out-of-frame rebuild. An out-of-frame rebuild pulls the engine so the block and crankshaft can be fully inspected and machined. For that job, see our overhaul kits.
What Is Usually in an Inframe Kit?
- Pistons, or a re-ring set that reuses your pistons
- Cylinder liners with seals
- Piston rings
- Connecting rod and main bearings
- Gaskets and seals for the job
Contents vary by brand and kit, so always read the parts list. Some kits also add parts such as rod bushings or thrust washers.
How to Match a Kit to Your Engine
- Find your engine serial number. It is on the engine data plate. For Cummins engines, the CPL number helps too.
- Know your piston type. Many engines came with different pistons over the years, such as two-piece and one-piece steel pistons. The kit must match.
- Check the horsepower rating. Some kits are made for higher-horsepower builds.
- Measure the crankshaft. If the crank has been ground, you need undersize bearings.
Common Engines and Kits
Internet Diesel carries inframe kits for the Cummins 855, ISX, ISX15, ISM, N14 and L10, the Caterpillar 3406A, 3406B, 3406E, C10, C12, C13 and C15, and the Detroit Diesel Series 60 and DD15. Browse them all in our diesel inframe kits collection.
Mistakes to Avoid
- Ordering by engine family only, without the serial number
- Skipping a check of the crankshaft and bearing clearances
- Reusing a worn oil pump, oil cooler or turbo that can damage new parts
- Not fixing the cause of the wear, such as dusting from a bad air filter
Parts to Replace at the Same Time
A rebuild is a good time to look at the cylinder head, injectors and turbo. Worn injectors can wash down new cylinders, and a leaking turbo can push oil into the intake. See our cylinder heads, fuel injectors and turbochargers.
Need Help Choosing?
Call 1-800-562-0360 or email sales@internetdiesel.com with your engine serial number. We will confirm the right kit before it ships. You can also pay over time with Affirm.