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Mitsubishi Evo 10 Motor Assembly Guide

Apr 22, 2025

Motor Assembly for Mitsubishi Evo 10 (4B11T)

Introduction

  • Full assembly from bare block to ready-to-run motor.
  • Expected capability: 740 horsepower.
  • Important components used:
    • Bearings: ATL race bearings for crank and main.
    • Studs and Bolts: FP head studs, ARP rod bolts, ARP main bolts.
    • Rods and Pistons: Manley I-beam rods, CP Pistons.
    • Gasket Kit: Mitsubishi Evo 10 master gasket kit.

Preparation

  • Work Area: Cleanliness is critical. Use shop towels and brake cleaner.
  • Tools Required:
    • Torque wrenches (foot-pound and inch-pound).
    • Wide variety of standard tools.
    • Specialty tools like ring compressor, plastigauge, and piston ring filer.

Measurement and Clearance Checks

  • Rod and Main Bearing Clearances: Measured using plastigauge.
    • Plastigauge is used due to lack of specialty tools.
  • Piston to Wall Clearance: Measured with a T-gauge.
    • CP spec calls for 3.5 thousandths of an inch.
  • Ring End Gap: Adjusted using a ring filer.
    • Different specs for street and high-performance.

Assembly Process

Initial Steps

  1. Clean Block and Crankshaft: Ensure all metal shavings and contaminants are removed.
  2. Install Bearings: Use assembly lube and set them in place.
  3. Install Crankshaft: Properly lubricate and position thrust bearings.

Piston and Rod Installation

  1. Piston Assembly:
    • Attach rods to pistons aligning valve reliefs and bearing tangs correctly.
    • Set piston rings with correct end gaps.
  2. Insert Pistons into Block: Use ring compressor and WD-40 for lubrication.
  3. Rod Caps and Torque: Apply correct torque sequence.

Engine Cradle and Head

  1. Engine Cradle Installation:
    • Seal using 3 bond 1215 sealant.
    • Torque sequence for bolts.
  2. Head Studs and Preparation:
    • Install ARP head studs by hand.
    • Clean threads thoroughly.

Head Installation

  1. Cylinder Head Preparation:
    • Clean gasket surfaces and assemble with sealant.
    • Use OEM Mitsubishi gaskets.
  2. Torque Sequence: Follow specified sequence and foot-pounds for tightening.

Camshaft and Timing

  1. Camshaft Installation:
    • Use assembly lube and ensure bearing is placed correctly.
    • Torque cam caps correctly.
  2. Timing Chain and Components:
    • Align cam gears and crank pulley to top dead center using timing marks.
    • Install oil pump and timing chain guides.
    • Ensure timing chain tension is correct.

Final Assembly

  1. Install Timing Cover: Use sealant and ensure proper alignment.
  2. Valve Cover and Spark Plugs: Install new plugs and coil packs.
  3. Oil Pan Installation:
    • Clean surfaces and apply sealant.
    • Torque oil pan bolts correctly.

Conclusion

  • Completed assembly from bare block to long block.
  • Detailed torque specs and sequence followed for all components.
  • Links provided for all tools and components used.

Note: This guide captures the key steps and considerations in the assembly of a Mitsubishi Evo 10 motor, ensuring precision and durability in high-performance applications.

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