By Caterpillar | Posted: June 1, 2022
One of the most common rebuild mistakes is failing to inspect the cylinder block properly. Skipping this step can lead to premature cylinder head gasket failure as well as block damage, and it’s especially important if you’re on your second or third overhaul or have a high-mileage engine.
If your block is clean, straight and free of cracks or erosion, you’re ready for step two. If not, you’ll need to perform a counterbore cut first. Specs are available on SIS.cat.com or you can ask your local authorized Cat dealer, who can walk you through your repair options if you can’t salvage the block.
Next up is inspecting the engine liners and lower counterbore.
If there’s no pitting or erosion, move to step three. Otherwise, epoxy or machine the area to smooth out the surface, which will help prevent leaks into the oil pan and excessive liner movement.
The final step before starting your rebuild is measuring liner projection — how far the liner extends above the spacer plate on top of the cylinder block. If it’s not correct, the question isn’t if your head gasket will fail, but when.
Now you’re ready to install the liners permanently and get started with on a successful Cat on-highway truck engine rebuild.
If you don’t have the proper tools or aren’t comfortable performing these inspections yourself, your authorized Cat dealer can help. Or you can choose Cat Reman engines and long blocks, which are already set up with the proper specifications. For more technical tips and how-to videos, check out the Cat On-Highway Truck Engine Playlist on YouTube.
*These inspections apply to 3406A/B/C/E, C-15, C-16, and C15 engines.