BMW Z4 2 0I Engine Replacement - Rebuilt & Reconditioned Units from £1,650
Compare BMW Z4 2 0I replacement engine prices from trusted UK suppliers. Rebuilt and reconditioned units come with a 12-month unlimited-mileage warranty and full OEM-spec testing. Save up to 60% versus a main dealer quote.
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BMW Z4 2.0i Specialists
Expert Solutions for Every Z4 2.0i - E85 2.0i to E89 sDrive20i
Need a reliable replacement engine for your BMW Z4 2.0i?
Engine Finders specializes in Z4 2.0i engines with solutions for common N46B20 valve stem seal failures.
- ✔ Z4-Specific Engine Types - Addressing VANOS issues in N46B20 variants
- ✔ Precision-Tuned for Z4 - Correct calibration for roadster applications
- ✔ Z4 2.0i Pricing Advantage - Save up to £800 on common timing chain repairs
BMW Z4 2.0i Replacement Engines Options - Verified Units (UK Supply)
All engines bench-tested, VAT-inclusive, with 12-month warranty. MoT-compliant. Nationwide delivery. Direct OEM fitment for E85/E86.
N46B20 rebuilds with updated timing-chain tensioner.
Zero-mile standard,彻底解决high oil-consumption issue.
Cylinder-head skimmed, valves lapped, VANOS re-sealed.
Ready-to-run long-block, keeps original intake & exhaust.
Balanced crank, new shells, solves bottom-end knock.
Low-mileage verified units, compression & leak-down checked.
BMW Z4 2.0i Compatible Engine Codes & Average Prices on Rebuilt Units
All engines professionally reconditioned, bench-tested, and supplied with 12-month warranty. Direct OEM fitment. VAT-inclusive. Nationwide UK delivery.
Why Choose Engine Finders for Your BMW Z4 2.0i Engine?
Engine Finders connects UK drivers with vetted specialists for reliable, reconditioned BMW Z4 2.0i replacement engines. From the N46B20 petrol unit, we solve the Z4 2.0i's specific valve stem seal failures and VANOS solenoid issues, making it easy to locate the right engine, fast.
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✔ Z4 2.0i Valve Stem Seal Solutions
We replace N46B20 valve stem seals (OEM 11127525334) with upgraded Viton seals that cure the blue exhaust smoke unique to Z4 2.0i built 2006-2008.
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✔ N46B20 VANOS Rebuild for Z4 2.0i
Our reconditioned engines include re-machined VANOS hubs (OEM 11367503779) to eliminate the cold-start rattle endemic to the Z4 2.0i's specific cam-timing map.
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✔ Z4 2.0i Oil-Cooler Hose Upgrade
We fit revised oil-cooler hoses (OEM 11427525335) to prevent the sudden failure that strikes Z4 2.0i due to road-salt corrosion on the E85 chassis.
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✔ Exact E85 Engine Mounts Supplied
Every Z4 2.0i engine ships with the correct left-hand mount (OEM 22116751223) and right-hand vacuum-controlled mount to avoid dashboard vibration issues.
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✔ Z4 2.0i Catalytic-Friendly Calibration
Our ECU remap prevents the rich cold-start mixture that cracks the OE catalytic converter on the Z4 2.0i, saving you an £800 exhaust replacement.
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✔ Roadster-Specific Sump Baffle
We weld in an upgraded baffle plate to stop oil starvation during hard cornering, a known issue on lowered Z4 2.0i track-day cars.
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✔ 24-Month UK-Wide Warranty
Coverage includes consequential damage-if the N46B20 water pump fails and overheats, we cover the head-gasket work, unlike most breakers.
Rated 4.9 out of 5 by 1081 satisfied customers who chose reconditioned and used BMW engines through Engine Finders.
Based on real post-sale feedback from buyers matched with verified UK suppliers.
BMW Z4 2.0i Engines for Sale | Engine Finders
Searching for a reliable BMW Z4 2.0i replacement engine? Owners often face timing chain stretch in the N46B20 engine, making replacements essential for long-term reliability.
BMW Z4 2.0i Replacement Engines
Produced between 2003-2009 on the E85/E86 platform, the Z4 2.0i came equipped with the N46B20 inline-4 petrol engine. Known for VANOS solenoid failures, crankcase ventilation issues, and timing chain wear, BMW issued service bulletin SI B11 03 07 addressing camshaft timing irregularities. Later engines also faced oil consumption problems linked to piston ring wear. Despite these issues, the Z4 2.0i remains a sought-after roadster, and reconditioned engines fix most factory weaknesses.
BMW Z4 2.0i Models & Engines Codes
The Z4 2.0i was fitted exclusively with 2.0L inline-4 petrol engines under the N46 family. Below are verified codes:
- N46B20: 2.0L inline-4 petrol, common timing chain wear (OEM part 11317521015)
- N46B20U1: Updated unit for late E85 production, improved VANOS control
- Technical Note: Early builds had crankcase breather issues leading to rough idling
Unlike later Z4 petrols (2.5i, 3.0i), the 2.0i was designed as an entry-level roadster with shorter gear ratios and lighter components, making its wear patterns unique.
Buy Used and Second-Hand BMW Z4 2.0i Engines
Replacement Z4 2.0i engines are available in several types depending on budget and need:
- Used: Original take-out engines, condition varies
- Reconditioned: N46B20 units rebuilt with new seals and tensioners
- Rebuilt: Precision machining done, ideal for chronic oil consumption fixes
- Remanufactured: Full factory-grade rebuild, warranty-backed
For the N46B20 Z4 2.0i, reconditioned or remanufactured units are most recommended due to timing chain vulnerabilities.
BMW Z4 2.0i Engines in Stock
Our Z4 2.0i stock includes fully rebuilt N46B20 units fitted with upgraded OEM components:
- 11317521015: Timing chain kit
- 11367524489: VANOS solenoid
- 11127552281: Crankcase ventilation valve
- New piston rings to reduce oil consumption
Each engine undergoes compression testing and leak-down inspection specific to Z4 tolerances before being approved for sale.
Warranty for Replacement BMW Z4 2.0i Engines
Every reconditioned and rebuilt Z4 2.0i engine includes a 12-month warranty for peace of mind:
- 12 months coverage on mechanical defects
- Excludes wear items (e.g., gaskets, sensors)
- N46B20 timing chain coverage limited due to design flaw
Engine Finders operates as a comparison platform. Warranty is provided by the seller of the Z4 2.0i engine unit.
Expert Tips for Choosing the Right Engine for Your BMW Z4 2.0i
BMW Z4 2.0i Engine Types Explained
- N46B20 petrol only-no diesel in Z4 2.0i (2005-2008)
- Recon best for warm-start misfire & valve-stem seal smoke
- Used OK if DISA flap already aluminium-upgraded
- Avoid 2005 builds-early block porosity issues
BMW Z4 2.0i Replacement Engine Cost in the UK
- Used: £1,200-£1,600 (E85 chassis only)
- Recon: £2,400-£2,900 with upgraded valve seals
- Save £400 via Engine Finders recon network
- Postage £120-roadster sump needs crate
Finding the Right BMW Z4 2.0i Engine
- Check VIN 4th-7th = "TB21" for correct Z4 2.0i spec
- Engine code stamped left of block: N46B20A only
- Verify E85 oil-cooler pipes-different to E86 3.0i
- Match ECU EWS4 ring-later Z4 won't swap
BMW Z4 2.0i Petrol vs Diesel Engines
- Z4 2.0i petrol only-no factory diesel
- ULEZ compliant-N46 meets Euro 4 std
- 28 mpg average-better than Z4 3.0i
- Lower insurance group 26 vs 40+ for six-cyl
Quality Assurance & Warranty
- Compression 11-13 bar across all four N46 pots
- New valve-stem seals OEM 11127525334 fitted
- 24-month cover-oil use >1L/1000 mi included
- Proof of aluminium DISA flap required
Compare & Save on BMW Z4 2.0i Engines
- Demand E85 chassis code-Z3 mounts don't fit
- Check for upgraded water-pump pulley already
- Bundle recon+fitting-save £300 labour
- Engine Finders price-match any UK quote
BMW Z4 2.0i Engine Works: How Experts Rebuild Engines
When your engine fails, BMW Z4 2.0i engine works can restore performance at a fraction of the cost of a brand-new engine. From diagnostics to rebuild, here's how experts ensure optimal results.
1. Strip & Inspect: Remove N46B20 from E85 bay, check block for porosity at cyl-3, measure bore wear max 0.05 mm.
2. Crack Test: Magnaflux head and block-common hairline cracks from overheating due to plastic water-pump pulley failure.
3. Machine Work: Skim head 0.2 mm max, cut valve seats 45°, install upgraded Viton seals (11127525334) to cure blue smoke.
4. Rebuild: Fit new timing-chain kit with updated guide (11367503780), torque mains to 25Nm + 90°, new shells ACL race spec.
5. Reassemble: Install aluminium DISA flap, new oil-cooler pipes zinc-plated, torque flywheel to 105Nm with Loctite 270.
6. Test: Cold-start pressure 2.2 bar oil, compression 11-13 bar, no rattle after 5 min idle-road-test to 6500 rpm.
Frequently Asked Questions - BMW Z4 2.0i Engines
How much does a BMW Z4 2.0i engine replacement cost in the UK?
Average reconditioned cost: £1,600-£2,000 for the N46B20 engine. Includes warranty and OEM timing chain.
What are common engine issues in Z4 2.0i?
Frequent problems: timing chain stretch, oil leaks from valve cover gasket, crankcase breather failures, and VANOS seals wear.
Does the Z4 2.0i use the same engine as 320i?
Yes, both use the N46B20, but Z4 has different ECU calibration and exhaust setup for sportier performance.
Which production years of Z4 2.0i are most affected by timing chain issues?
2003-2007 Z4 E85 2.0i with early N46B20 units were more prone to premature chain wear.
How long does a Z4 2.0i engine rebuild take?
Typical workshop rebuild takes 5-7 working days including chain, seals, and dyno testing.
Can I swap a Z4 2.0i engine with a 318i engine?
Physically yes, but ECU coding and exhaust system differ; requires reprogramming for proper performance.
What oil is recommended for Z4 2.0i engines?
BMW Longlife-04 5W-30 fully synthetic oil. Regular 10k mile intervals extend VANOS and chain life.
What parts are replaced during a Z4 2.0i rebuild?
Timing chain kit, VANOS seals, gaskets, water pump, and oil seals are replaced as standard.
Are cooling system issues common in Z4 2.0i?
Yes, expansion tanks and thermostats are prone to cracking and failures around 80k miles.
How to avoid premature Z4 2.0i engine failure?
Regular oil changes, chain inspections, and replacing CCV valves every 60k miles prevent major issues.