# Engine Rebuilding in Upland > Engine rebuilding in Upland explained: teardown, measuring, new wear parts, assembly and break-in, with every step shown on your written estimate. Source: https://route66autorepairshop.com/engine-services/engine-rebuilding Updated: 2026-09-17 Business: Route 66 Auto Repair, 1775 W Foothill Blvd, Upland, CA 91786, (909) 608-7699 Hours: Monday to Friday 8 AM–5 PM, Saturday 8 AM–2 PM, Sunday closed **TLDR:** A rebuild means **teardown, measurement and new wear parts**. Your **written estimate shows every step**, and we compare it honestly with a replacement engine. Engine rebuilding at Route 66 Auto Repair in Upland is the path for an engine with internal wear or damage that is still worth keeping. The engine is removed, torn down, cleaned, measured and assembled with new wear parts. It is a big job, so we spend real time on the decision first. Your written estimate shows every step, including any machining steps, before you approve anything. ## When does a rebuild make sense? A rebuild fits when tests show worn rings, damaged bearings or scored cylinders, and the rest of the vehicle is in good shape. It also fits vehicles where a good used engine is hard to find, such as older trucks, low-production models or a classic you plan to keep. It fits less well when the block is cracked or the vehicle is near the end of its useful life. Before you choose, we confirm the damage with [engine block diagnostics](https://route66autorepairshop.com/engine-services/engine-block-diagnostics) and compression or leak-down readings. Then we put a rebuild next to a replacement engine on paper. ## What happens during a rebuild? After removal, the engine is disassembled and every major part is cleaned and measured against factory specifications: cylinder bore size and taper, crankshaft journal diameters, head flatness, valve guide clearance. Those numbers decide which parts can be reused, which need machining such as [cylinder head resurfacing](https://route66autorepairshop.com/engine-services/cylinder-head-resurfacing) or [crankshaft polishing](https://route66autorepairshop.com/engine-services/engine-crankshaft-polishing), and which must be replaced. Rings, bearings, gaskets, seals and the timing set are typically new. The assembly is checked as it goes: bearing clearances, ring gaps and crankshaft end play. ## Our engine rebuilding process 1. **Confirm and compare:** Test results and a rebuild versus replacement comparison come first. 2. **Remove and tear down:** The engine comes out and apart, with photos of damaged parts. 3. **Measure:** Every wear surface is measured and recorded. 4. **Update the estimate:** Measured findings finalize the parts and machining list for your approval. 5. **Assemble and install:** Clearances are checked during assembly, then the engine is installed and filled. 6. **Start-up and road test:** We watch oil pressure, temperature and leaks, then road-test. ## What's included in an engine rebuild - Engine removal and reinstallation - Teardown with photos - Measurement record of wear surfaces - New rings, bearings, gaskets and seals - Timing components as listed on the estimate - Fresh oil, filter and coolant - Break-in instructions in writing ## Need-now or need-later? **Need now:** - A knocking bottom end or very low compression **Need later:** - Gradual oil consumption you can manage while you save and plan - Blow-by that has not yet fouled plugs ## How pricing and timing work A rebuild is priced after measurement, because wear sets the parts list. Timing is measured in days, and parts or machining lead times can extend it. We set a pickup window the board can hold and text you if it moves. AAA members save 10% on parts and labor, up to $75. ## Aftercare and break-in Follow the written break-in steps: vary your speed, avoid towing and long full-throttle climbs, and return for the first oil change when we specify. New rings seat during this period. We check for leaks and torque at that visit. ## Frequently asked questions ### Is rebuilding an engine better than buying a used one? It depends on the vehicle. A rebuild gives you known parts and measurements. A used engine can be faster, but its history is harder to verify. We compare both on paper before you decide. ### Where is the machining done? Your written estimate shows every step of the rebuild, including any machining, so you can see exactly what is being done to your engine before you approve it. ### How long does an engine rebuild take? Usually days rather than hours, and parts availability matters. We give you a window the schedule can hold and text you if it slips. ### What voids coverage on a rebuilt engine? Coverage depends on the parts and the repair and is written on your invoice. Following the break-in instructions and oil change timing protects the work. --- Call (909) 608-7699 or visit https://route66autorepairshop.com/contact for a written estimate.