BMW N46 Engine
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BMW N46 Engine For Sale
This small family, together with the N45 family, has taken the place of the previous N42 family, of which it retains the main construction features, namely:
4- cylinder in-line architecture ;
cylinder head with 4 valves per cylinder;
distribution with two overhead camshafts ;
presence of the Vanos double variable valve timing system ;
presence of the continuous valve timing system Valvetronic.
Few differences compared to the previous family, especially in terms of performance. Structurally, the main differences were in the better balancing and therefore in the reduction of vibrations by means of special balancing countershafts ; There were also new connecting rods, new roller tappets for the camshafts, new spark plugs and a new cylinder head. The two versions that make up the N46 family are described below.
Best Engine Replacement Procedure
- Swap the engine’s oil, fuel and oil filters, and coolant.
- Install new engine and external coolers if existing.
- Cleanse the cooling system thoroughly, then replace the water pump.
- Renew necessary hoses and belts.
- Install a new timing belt, spark plugs, and wires.
- Replace essential gaskets and seals, focusing on the oil pan, front, and rear main seals.
- Clear the vehicle’s computer codes before engine installation.
- Ensure the replacement engine matches the original specifications.
- Transfer exhaust manifolds, mounts, distributor, and sensors from the old engine.
- Disable fuel and ignition before ignition to prime the oil.
- Ensure no plugs or tape remain on the engine before installation.
7 Common Mistakes to AVOID!
- Not resetting the vehicle’s computer codes before installation.
- Skipping the step of adding engine oil before the first startup.
- Forgetting to deactivate the fuel and ignition systems, essential for priming the oil.
- Ignoring the replacement of the oil cooler or the radiator’s integrated oil cooler.
- Overlooking the cleaning of the radiator and checking the operation of the cooling fans.
- Not swapping out the flywheel and its securing bolts.
- Trying to initiate the engine’s first run without proper priming.