Here’s a detailed description of the 1MZ-FE engine — as used in vehicles like the Toyota Estima (MCR30), Toyota Alphard (MNH10) and Toyota Harrier — including specs, features, strengths & common issues.

(If by ''engine kosong'' you meant a bare engine / long-block without accessories, many of the fundamentals here still apply.)

Basic specification & architecture

• The 1MZ-FE is a 3.0 litre (2,994 cc) V6, naturally aspirated, gasoline engine.  
• It uses an aluminum alloy block (with cast-iron cylinder liners) and aluminum heads.  
• Bank angle is 60°, typical V6 layout.  
• Bore & stroke: 87.5 mm × 83 mm.  
• Valvetrain: DOHC (Dual Overhead Cam), 4 valves per cylinder → 24 valves total.  
• Compression ratio ~10.5 :1 in many versions.  
• Fuel injection: Sequential multi-port injection (MPFI).  
• Some later versions include Toyota’s VVT-i (Variable Valve Timing – intelligent) on the intake cam to improve efficiency & performance.  

Performance figures

• Depending on version (with/without VVT-i, market variant) the outputs vary:
  
• Without VVT-i, power around ~184-190 hp (≈137-140 kW).  
• With VVT-i later, up to ~210-220 hp (≈156-162 kW).  
• 
  
• Torque: approximately ~300 Nm (about 224 lb-ft) at ~4,400 rpm for the higher output versions.  
• Example: In the Toyota Alphard 3.0 V MZ 4WD version: 223 PS (~220 hp) at 5,800 rpm, 304 Nm at 4,400 rpm.  

Key engineering features & strengths

• Lightweight design: aluminum block & heads help reduce weight compared to older cast-iron alternatives.  
• Smoothness: As a V6 with good balance features (e.g., semi-counterweights on the crank) it provides smooth operation.  
• Good for multi-purpose applications: was used in sedans, MPVs, SUVs with 4WD in various markets (fits your context: Estima, Alphard, Harrier).
• Reliable when properly maintained: Many owners report good long-term durability if care is taken.

Common issues / things to watch for (especially if prepping a bare engine or looking at a used one)

• Oil sludge buildup: This engine is noted to have problems with sludge if oil changes are neglected or low quality oil is used. 
  ''The 1MZ-FE only really has one major weakness: oil sludge if you extend the oil change intervals and/or use low quality oil.''  
• Oil leaks: Seals and gaskets (valve cover, cam seals) tend to leak after high mileage.  
• Misfires / ignition issues: Some owners report rough idling or misfire codes especially when the engine is warm.  
• Timing belt & accessories: If it’s an older engine, service interval of timing belt, water pump, etc should be considered. (Though this engine is non-interference in many markets, reducing risk if belt fails.)  
• Check history for previous maintenance: A ''clean'' engine history helps ensure you avoid hidden wear or damage.

If you’re dealing with an ''engine kosong'' (bare engine / long block) scenario

Here are some suggested checks & considerations:

• Inspect the block & heads for signs of damage, scoring, corrosion, or warpage.
• Check whether the VVT-i mechanism (if applicable) is present and functional.
• Verify mileage / hours if known, and past oil change history to assess sludge risk.
• Check crankshaft & bearing condition (especially if you can see main journals).
• Check for any signs of overheating (discolored heads, warping).
• Prepare to replace all seals, gaskets, belts (timing), water pump, oil pump (if high mileage) as preventive.
• Confirm compatibility with your vehicle (mounts, 4WD vs 2WD variant, wiring/harness differences).
• Consider that 4WD versions may have additional loads (transfer case, rear diff) and make sure the engine is suited to that setup.

If you like, I can pull up detailed service manual info (torque specs, belt routing, timing marks) for the 1MZ-FE as fitted in your specific vehicle (Estima MCR30 / Alphard MNH10 / Harrier) so you have everything for a rebuild or inspection. Do you want me to fetch that?