BMW 3 Series 318is Engine ReplacementCompare Prices & Get Quotes
Get free, no-obligation quotes today from trusted UK BMW 3 Series 318is engine specialists. Compare prices on reconditioned, rebuilt and used engines for both generations of the 318is - from the E30 M42 to the E36 M42 and M44.
Supply & Fit Available
12-Month Warranty
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100+ Suppliers
From £1,500 to £2,500
Used from £550 · Reconditioned from £1,200 · Common codes: M42B18, M44B19
From £550
Tested, bare/short engine
From £1,200
Rod bearings addressed, tested
From quote
Upgraded bearings, full teardown, revised valvetrain
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3 Simple Steps3 Simple Stepsto Finding the Best BMW 3 Series 318is Replacement Engineto Finding the Best BMW 3 Series 318is Replacement Engine
Most replacements completed within 3-5 days.
Variant HistoryBMW 3 Series 318is - Engine History & Specs at a Glance
The BMW 318is was introduced as the sporty four-cylinder variant of the 3 Series, positioned between the standard 318i and the six-cylinder 325i. The "s" denoted a four-valve-per-cylinder engine with twin overhead camshafts - a significant step up from the eight-valve M40 and M43 engines fitted to the standard 318i. The 318is was produced across two generations: the E30 (1989-1991) and the E36 (1991-1999), with a mid-life engine update from the M42B18 to the M44B19 in 1996.
Variant HistoryBMW 3 Series 318is - Engine History & Specs at a Glance
The BMW 318is was introduced as the sporty four-cylinder variant of the 3 Series, positioned between the standard 318i and the six-cylinder 325i. The "s" denoted a four-valve-per-cylinder engine with twin overhead camshafts - a significant step up from the eight-valve M40 and M43 engines fitted to the standard 318i. The 318is was produced across two generations: the E30 (1989-1991) and the E36 (1991-1999), with a mid-life engine update from the M42B18 to the M44B19 in 1996.
BMW 3 Series 318is
Fuel TypePetrol
Engine Size Range1.8L - 1.9L
Power Output Range136-140hp across the variant's historyEngine History Timeline
1991 (E30) - M42B18 1.8-litre 16-valve DOHC, 136hp (later 140hp)
1995 (E36 pre-facelift) - M42B18 1.8-litre 16-valve DOHC, 140hp
1999 (E36 facelift) - M44B19 1.9-litre 16-valve DOHC with DISA, 140hp
Key Specs Snapshot
Fuel TypePetrolEngine Size Range1.8L - 1.9LPower Output Range136-140hp across the variant's historyYears Produced1989-1999 (UK)Every engine fitted to the BMW 3 Series 318is is covered below, with UK rebuilt pricing and known failure points.
BMW 3 Series 318is Engine Codes - Specifications & Replacement CostBMW 3 Series 318is Engine Codes - Specifications & Replacement Cost
1.8-litre Petrol (1989-1995, E30 & E36 pre-facelift)
Power Output136hp (E30) / 140hp (E36)Years Fitted1989-1995
Compatible Trim Levels
- 318is (E30 Coupe)
- 318is (E36 Coupe)
- 318is (E36 Sedan, 1992-1995)
Find your exact engine code, specs and UK replacement cost guide.
Used
Tested, ready-to-fit engine
£550-£1,200
Reconditioned
Addressed known issues, tested
£1,200-£1,800
Rebuilt
Full teardown, upgraded internals
£1,800-£2,500
Common Failure
The M42's timing chain tensioner and guide rails are a well-documented weak point. The intermediate plate that holds the timing chain idler gear can crack and fail. As an interference engine, timing chain failure causes valves to hit pistons, often writing off the cylinder head. The original M42 tensioner design is prone to rattle; upgrading to the later M44-style tensioner is a common preventative fix.
The BMW 318is was fitted with two generations of BMW's four-cylinder 16-valve engine - the M42B18 (1989-1995) and the M44B19 (1996-1999). Both are interference engines, meaning timing chain failure is catastrophic. The M42 and M44 are now classic engines, and parts availability - while still good - is not what it was when these cars were new. Rebuilt engines through EnginesMarket include upgraded timing components and are backed by a minimum 12-month unlimited-mileage warranty.
Why the BMW 3 Series 318is M42 and M44 Wear Prematurely
Affected Vehicles
BMW 3 Series 318is (M42B18, 1989-1995; M44B19, 1996-1999)
Typical Failure Mileage
80k-120k (though many fail earlier or later depending on maintenance)
Root Cause
The timing chain tensioner on both the M42 and M44 is prone to failure, allowing the chain to slacken. The intermediate plate that holds the timing chain idler gear can crack and fail. As an interference engine, chain failure causes valves to hit pistons - often writing off the cylinder head. Upgrading to the later M44-style tensioner is a common preventative fix for the M42.
Why It Happens
The timing chain tensioner on both the M42 and M44 is prone to failure, allowing the chain to slacken. The intermediate plate that holds the timing chain idler gear can crack and fail. As an interference engine, chain failure causes valves to hit pistons - often writing off the cylinder head. Upgrading to the later M44-style tensioner is a common preventative fix for the M42.
Dealer (parts + labour)
£1,200-£1,800
Specialist (parts + labour)
£800-£1,400
What it involves
New chain, tensioner, guides and sprockets
Suitability
Best caught early - before chain failure causes valve damage
1 - 2 daysDealer (parts + labour)
£3,500-£6,000
Specialist (parts + labour)
£1,800-£3,200
What it involves
Supply & fit, upgraded timing components, 12-month warranty
Suitability
Recommended if chain has failed or engine is high-mileage
1 - 2 daysAll prices are indicative UK market ranges based on current UK specialist supplier data.| Repair Tier | Dealer (Parts + Labour) | Specialist (Parts + Labour) | What It Involves | Suitability | Estimated Time |
|---|---|---|---|---|---|
 Timing chain replacement (preventative) Minor | £1,200-£1,800 | £800-£1,400 | New chain, tensioner, guides and sprockets | Best caught early - before chain failure causes valve damage | 1 - 2 days |
 Full engine replacement - rebuilt/reconditioned Best Value | £3,500-£6,000 | £1,800-£3,200 | Supply & fit, upgraded timing components, 12-month warranty | Recommended if chain has failed or engine is high-mileage | 1 - 2 days |
Vehicle Value Check
Vehicle Value Check
A typical BMW 3 Series 318is E30 is worth approximately £4,000-£15,000 depending on condition. An E36 318is is worth roughly £3,000-£8,000. - Vehicle worth under ~£5,000: used engine or timing chain repair typically makes more sense than a full rebuilt unit. - Vehicle worth ~£5,000-£8,000: evaluate both; reconditioned is viable if keeping the car 2+ years. - Vehicle worth ~£8,000-£15,000: reconditioned/rebuilt usually justifies the premium via warranty and reliability. - Vehicle worth £15,000+: replacement cost is typically small relative to vehicle value.
Our Recommendation
Our Recommendation
If your 318is has timing chain rattle but the engine hasn't suffered valve damage, a specialist timing chain replacement with the upgraded M44-style tensioner (£800-£1,400) is often the most cost-effective solution. If the chain has already failed and the cylinder head is damaged, a used or reconditioned engine is usually the sensible path. For E30 examples with rising classic values, a rebuilt unit is a justifiable investment.
Don't Let Engine Failure Write Off Your BMW 3 Series 318is
Whether you own an E30 or E36 318is, engine failure doesn't have to mean the end of the road. The M42 and M44 are well-understood engines with a strong specialist support network in the UK. Rebuilt engines through our network come with upgraded components that address the original failure points, plus a minimum 12-month unlimited-mileage warranty. Compare quotes today and get your 318is back on the road with nationwide supply & fit options.
Compare rebuilt M42B18 BMW 3 Series 318is engine prices
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Best Price GuidanceImportant Information
Important Information
"All prices are indicative UK market ranges based on historical quote data and repair requests from our network of engine specialists. Dealer pricing is estimated based on published main dealer labour rates and genuine OEM parts pricing. Specialist pricing reflects actual quote data from EnginesMarket's UK network. Actual costs vary depending on damage severity, vehicle condition, variant, and workshop location within the UK. Use our free comparison tool to get tailored quotes for your specific BMW 3 Series 318is. Every engine supplied through EnginesMarket carries a minimum 12-month unlimited mileage warranty - always confirm exact terms with your chosen supplier."
BMW 3 Series 318is Engine ReplacementFrequently Asked Questions
Question 1How much does a BMW 3 Series 318is engine replacement cost-
A BMW 3 Series 318is engine replacement typically costs £1,800-£3,200 for a rebuilt unit supply-only, or £2,500-£4,500 fitted by a specialist. Used engines start from around £550-£1,400, while reconditioned units range from £1,200 to £2,000 depending on the engine code.
- Prices vary by engine code - M42B18 and M44B19 have different cost profiles
- Rebuilt engines carry a 12-month unlimited-mileage warranty
- Supply & fit adds £400-£800 in labour depending on the generation
Question 2What are the signs of timing chain failure in a BMW 318is-
The most common early warning is a rattling noise from the front of the engine, particularly between 3,000-4,000 RPM. As wear progresses, the rattle becomes more persistent and may be accompanied by a check engine light or, in severe cases, engine failure.
- Rattling on start-up or at mid-RPM is the #1 symptom - don't ignore it
- The M42 and M44 are interference engines - chain failure bends valves
- If caught early, a chain replacement (£800-£1,400) is far cheaper than a full engine (£1,800-£3,200)
Question 3Is it worth replacing the engine in a BMW 3 Series 318is-
It depends on the generation and the car's condition. For an E36 318is valued at £3,000-£6,000, a full rebuilt engine at £1,800-£3,200 may represent 50-100% of the car's value - often making a used engine or repair the better option. For an E30 318is in good condition (valued £4,000-£15,000), replacement is more easily justified.
- Check the vehicle's current market value before committing
- For sub-£5k E36s, consider a used engine (£550-£1,400) rather than a rebuild
- For E30s with rising classic values, a rebuilt unit with warranty is usually the smarter long-term investment
Question 4What's the difference between the M42 and M44 engines in the 318is-
The M42 (1989-1995) is a 1.8-litre 16-valve DOHC engine producing 136-140hp. The M44 (1996-1999) is its evolution - a 1.9-litre 16-valve DOHC engine also producing 140hp but with a DISA variable intake system and a new generation of engine management.
- M42: simpler, no DISA, but timing chain idler gear failure is a known issue
- M44: larger displacement, DISA valve adds complexity, plastic heater flange is a weak point
- Both are interference engines - timing chain failure is catastrophic
Question 5How long does a BMW 3 Series 318is engine replacement take-
A typical BMW 3 Series 318is engine replacement takes 2-3 days for a specialist workshop, assuming the replacement engine is already in stock. The E30 and E36 generations require approximately 8-12 hours of labour.
- Allow 2-3 days for supply & fit through a specialist
- Supply-only engines are typically dispatched within 1-2 working days
- Additional time may be needed if ancillary parts (cooling system, clutch, flywheel) are being replaced
Question 6What warranty comes with a BMW 318is replacement engine-
Every rebuilt and reconditioned BMW 3 Series 318is engine supplied through EnginesMarket carries a minimum 12-month unlimited-mileage warranty. Used engines typically come with a shorter warranty (30-90 days) depending on the supplier - always confirm exact terms before purchasing.
- Rebuilt: 12 months / unlimited mileage minimum
- Reconditioned: typically 6-12 months
- Used: 30-90 days, supplier-dependent
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Replacing the engine in your BMW 3 Series 318is is a significant decision - but it doesn't have to be a costly guessing game. The M42 and M44 are well-understood engines with a strong specialist support network in the UK. Compare quotes from vetted UK specialists who know these engines inside out. Enter your registration, get free, no-obligation quotes, and choose the best price and warranty for your 318is today.
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