Mazda 3 5 6 FED 2.0L L4 Engine 12820E 2006-2013

Description

Automotive repair shops battle chronic oil burning when servicing high-mileage sedans with worn rings. This Mazda 3 12820E Remanufactured Engine replaces failing 2.0L 4-Cylinder 16-Valve DOHC motors with verified factory tolerances. A mandatory trade-off involves rotating the crankshaft by hand during oil priming to avoid dry cam follower contact on cold startup.

Cast aluminum engine block features casting mark T5251 with cast iron cylinder sleeves for thermal stability. The assembly uses cylinder head casting 6M8G-6090-A and camshaft core castings L3G2-421 and LF17-441. Crated envelope dimensions measure 38in length by 38in width by 38in height with a total dry weight of 252 lbs. Rotating internals include a cast steel micro-polished crankshaft, sintered powder metal connecting rods, and an oil pan capacity of 4.5 quarts.

Key Features of Mazda 12820E

Fleet managers buy Mazda 12820E remanufactured engine long blocks to bring high-mileage compact cars up to original performance specifications. This Federal emissions unit provides smooth idle quality and factory diagnostic compliance for commercial fleets.

• Precision deck surfacing provides an Ra 25 surface profile to maintain cylinder head gasket seal integrity
• Diamond plateau cylinder honing leaves precise oil retention patterns that eliminate premature piston ring wear
• Micro-polished crankshaft journals hold 0.0003in runout to preserve critical rod bearing oil films
• Line-bored main bearing journals eliminate crankcase distortion and lower internal rotating friction across all engine speeds
• Genuine multi-layer steel head gaskets seal combustion pressures and prevent coolant intrusion into cylinder bores
• Overhead camshaft lobes are ground and polished to match OEM lift profiles for consistent cylinder breathing
• New hardened valve seats and guides maintain 0.001in concentricity to ensure tight sealing under heavy loads

Dyno Load Precision Machining Tolerances

Dyno load cell testing verifies 148 HP at 6,500 RPM and 135 ft-lbs of shaft torque at 4,500 RPM under operational conditions. Machinists maintain crankshaft journal roundness within 0.0003in TIR and hold connecting rod bearing clearances at 0.0013in. Honed cylinder walls generate compression readings between 180 PSI and 185 PSI across all 4 cylinders. Bench testing confirms hot engine oil pressure of 58 PSI at 3,000 RPM while regulated coolant temperatures hold steady at 190°F throughout extended run cycles.

Vehicle Fitment Drivetrain Guide

This remanufactured long block fits 2006 to 2013 Mazda 3 models with the 2.0L 2000cc L4 gasoline engine bearing VIN code F and Federal emissions certification. Unit mates with front-wheel drive configurations running either automatic or manual transmissions. Negative fitment note: this engine does not fit 2.3L or 2.5L Mazda models, does not support California emissions PZEV exhaust air injection setups, and will not fit Mazda 5 or Mazda 6 applications without timing cover swaps.

Installation Protocol Service Schedules

Verify electronic throttle body calibration and reconnect chassis grounding cables before cranking the engine. Flush oil cooler lines and heater cores to eliminate residual metal contamination from the prior failed engine. Do not connect aftermarket forced induction systems exceeding 6 PSI of boost to this stock compression assembly.

• Pre-fill the oil filter and crankcase with 4.5 quarts of conventional 5W-20 break-in oil before ignition
• Drain break-in motor oil and replace spin-on oil filter after completing the first 500 miles
• Complete recurring synthetic engine oil service and multi-point inspections every 3,000 miles or 5,000 miles

Warranty Terms Core Return Policy

Customers receive a 3-Year Unlimited-Mile parts warranty on every remanufactured long block assembly. We provide prepaid freight return tags for your rebuildable core with a flexible 30-day return window. Crated engine shipments include the assembled block, cylinder head, oil pan, front timing cover, and printed installation instructions.