Volvo B230 Rebuild, common faults & everything you need to know
The complete guide to Sweden's most popular inline-4. From head gasket to 600-horsepower turbo builds - with workshop prices.
Robert has been building and reconditioning redblock engines for decades. The B230 is one of the most rewarding engines to work on - the cast-iron block is almost indestructible and takes boring to oversize without trouble. With the right craftsmanship a reconditioned B230 lasts as long as a new one. We do everything from cylinder head reconditioning till complete engine reconditioning with a 12-month warranty.
The B230 at a glance
All dimensions and data for the B230 series. Taken from Volvo original documentation.
| Variant | Power | Torque | Compression | Fuel system |
|---|---|---|---|---|
| B230E | 131 hk | 186 Nm | 9.8:1 | LH-Jetronic 2.4 |
| B230F | 114 hk | 170 Nm | 9.8:1 | LH-Jetronic 2.4 |
| B230FK Turbo | 135 hk | 265 Nm | 8.7:1 | LH-Jetronic + Garrett T3 (low pressure) |
| B230FT Turbo | 165 hk | 265 Nm | 8.7:1 | LH-Jetronic + Garrett T3 |
| B230FT+ Turbo+ | 165 hk | 290 Nm | 8.7:1 | LH-Jetronic + Garrett T3 + IC |
Torque specs
Verified against the Volvo factory manual TP-30170 (Group 21, Reconditioning Engine). All values apply to oiled threads per Volvo. Degreased parts must be oiled before assembly.
Cylinder head & valvetrain
Engine block & bottom end
Timing belt & timing
Intake, exhaust, other
NOTE - Head bolts: Volvo allows reuse up to 5 times if the stretch is checked (max 55,5 mm). Meksta always fits new bolts on disassembly. The reason: stress build-up on stretched bolts is invisible and can give a false torque reading. The cost of new bolts is negligible against the risk of a head gasket failure. Lubricate the new bolt threads with 30-weight engine oil (not moly/graphite). Tightening sequence from the centre outwards: 7-3-1-5-9 upper / 8-4-2-6-10 lower.
NOTE - Con-rod bolts: Volvo specifies two torque values depending on the stud type. Identify the bolts and use the correct value. If in doubt, always fit new studs and run 70 Nm.
NOTE - Flywheel: Always use new bolts. Coat the threads with thread-locking compound Volvo P/N 116 1056-5. Use flywheel locking tool 5112 when tightening.
NOTE - Crankshaft centre bolt: Use holding tool 5034. Anchor it in the bolt holes for the harmonic damper, not on the pulley.
Factory tolerances & wear limits
Original values from the Volvo TP-30170 Reconditioning manual.
The cylinder head in detail
Cylinder head design, valve data and wear limits. Source: Volvo TP-30170 Reconditioning Engine, Group 21.
The B230 has an aluminium cylinder head (OHC, 8 valves) on a cast-iron block. The head is fairly robust but prone to flatness deviation when overheated, especially between cylinders 3 and 4. During reconditioning, cylinder head resurfacing down to a minimum of 145,6 mm is allowed per Volvo - beyond that the head is scrapped.
Cylinder head dimensions
Valves
Valve guide
Common cylinder head faults on the B230
- Flatness deviation between cylinders 3 and 4 - the most common failure after overheating. The head gasket blows if the flatness deviation exceeds 0,5 mm. Fix: cylinder head resurfacing to min 145,6 mm.
- Valve guide wear - at high mileage (200 000+ km) the guides develop oil clearance over 0,15 mm. Symptoms: blue smoke on cold start, oil consumption. Fix: replace guides, re-ream the valves.
- Thread damage in the head bolt holes - from the top head bolt on the exhaust side. Volvo allows a helicoil in the M10 threads but not in the valve seat insert bores.
- Camshaft bearing damage - from oil starvation or long service intervals. Symptom: a ticking noise at idle. Fix: replace camshaft + bearings.
- Valve seat recession (turbo models) - the exhaust seats sink over time on Stellite-faced turbo valves. Must be measured during reconditioning.
Common faults on the B230
This is what we see most often when a B230 comes into the workshop. Symptoms, causes and how we fix them.
Head gasket blows
Common • High- Symptoms
- White smoke from the exhaust, coolant loss with no visible leak, "mayonnaise" under the oil filler cap, overheating.
- Cause
- Difference in thermal expansion between the aluminium cylinder head and the cast-iron block. Made worse by overheating. Most common at the cylinder 2-3 cold bridge.
Camshaft wear
200 000+ km • Medium- Symptoms
- Rough idle, rattles on cold start, loses power in the mid range.
- Cause
- Worn cam lobes, a failed cam chain tensioner, poor oil maintenance with intervals too long.
Cylinder wear & ovality
250 000+ km • High- Symptoms
- Rising oil consumption (>0.5 L/1000 km), blue smoke under acceleration, poor compression, an oil film on the spark plugs.
- Cause
- Normal mechanical wear after 200 000+ km. Made worse by short trips and driving with a cold engine.
Crankshaft bearing wear
Uncommon • Critical- Symptoms
- Knocking from the bottom end under load, low oil pressure, metal filings visible at the oil change.
- Cause
- Worn big-end and main bearings, oil pump failure, oil starvation or contaminated oil (coolant ingress).
Valve guide wear
150 000+ km • Medium- Symptoms
- Blue smoke on start-up (especially in the morning), gradually rising oil consumption.
- Cause
- Natural wear in the valve guides. The aluminium cylinder head wears faster than the cast-iron guides.
Turbo failure (B230FK/FT/FT+)
Turbo models • High- Symptoms
- A whistle that changes character, oil leaking from the turbo, heavy smoke, loss of boost build-up.
- Cause
- Worn turbo bearings, a cracked turbo housing, a blocked oil return line, oil coking after hard driving.
B230 Rebuild Prices
Prices based on B230 specifications: 4 cyl, 96 mm bore, 8 valves, 5 main bearings + 4 big-end bearings. All prices excl. VAT and parts.
Cylinder head reconditioning
Bottom end
Full rebuild
Performance
Cylinder machining
| Service | Price |
|---|---|
| Cylinder boring 4 cyl inline block (96 mm) | 3 318 kr |
| Plateau honing 4 cyl | 1 050 kr |
| Stress boring 4 cyl | 4 603 kr |
| Cylinder liner replacement, dry, 4 cyl | 6 216 kr |
| O-ringing block 4 cyl | 2 800 kr |
Crankshaft work
| Service | Price |
|---|---|
| Crankshaft grinding (5 main + 4 big-end) | 3 010 kr |
| Polishing standard | 1 022 kr |
| Cleaning 4-cyl crankshaft | 784 kr |
| Straightening (medium) | 1 190 kr |
| Camshaft journal grinding 5 pcs | 1 540 kr |
| Remove/refit 8 counterweights | 2 044 kr |
Valve reconditioning
| Service | Price |
|---|---|
| Cutting 8 valve seats (standard) | 910 kr |
| Cutting 8 valve seats (large) | 1 386 kr |
| Valve guide replacement 8 pcs (light alloy) | 1 274 kr |
| Manufacturing valve seat rings 8 pcs | 1 540 kr |
| Bronze sleeves fitting 8 pcs | 1 134 kr |
Cylinder head resurfacing
| Service | Price |
|---|---|
| Resurfacing cylinder head 4 cyl (standard) | 1 330 kr |
| Resurfacing cylinder head 4 cyl (large) | 1 596 kr |
| Resurfacing block 4 cyl (standard) | 1 988 kr |
| Resurfacing block 4 cyl (large) | 2 114 kr |
| Resurfacing manifold 4 cyl | 2 842 kr |
| Deck decking block 4 cyl | 1 974 kr |
Con-rod work
| Service | Price |
|---|---|
| Replace con-rod bush 4 pcs | 2 240 kr |
| Manufacture con-rod bush 4 pcs | 2 898 kr |
| Length adjustment con-rod 4 pcs | 2 898 kr |
| Replace press-fit piston 4 pcs | 1 582 kr |
| Piston ring replacement, cleaning 4 pcs | 1 106 kr |
| Resizing big-end housing 4 pcs | 2 352 kr |
| Check / straightening con-rod 4 pcs | 1 414 kr |
| Full reconditioning con-rod 4 pcs | 3 164 kr |
| Steel shot peening con-rods 4 pcs | 2 268 kr |
Pressure testing & balancing
| Service | Price |
|---|---|
| Pressure testing cylinder head 4 cyl (small) | 1 876 kr |
| Pressure testing cylinder head 4 cyl (large) | 2 800 kr |
| Pressure testing cylinder block | 1 400 kr /h |
| Balancing rotating assembly straight 4-cyl | 3 742 kr |
| Weight matching con-rods 4 pcs | 1 316 kr |
| Weight matching pistons 4 pcs | 1 092 kr |
| Flywheel balancing | 2 100 kr |
| Balancing flywheel + clutch | 2 842 kr |
Tune the B230
From street car to rally engine. The B230 is one of the most flexible engines to build on - the cast-iron block takes enormous loads.
- 1
Turbo conversion (NA → turbo)
Garrett T3/T4 turbo, fuel system, ECU remapping. An excellent fit on a B230E/F as the base.
220-250 hk - 2
Camshaft + porting
Sports profile camshaft (270-280°), porting of the intake and exhaust ports for better airflow.
280-320 hp (turbo) - 3
Internal strengthening
Forged pistons, H-beam con-rods, ARP bolts, balancing. Standard-bearing max is ~350 hp.
350-450 hk - 4
Stroker kit (2.5L)
A longer-stroke crankshaft gives 2.5L without increasing the bore. Full race spec.
400-600 hk
B230 Camshaft Profiles
We grind our own camshaft profiles for the B230 from a blank, on our own camshaft grinder. Every shaft ships with a complete grind report. Two series: The M series with the original base circle for street cars and folkrace, and The MB series (Race) with a modified base circle for higher power demands.
The difference? The MB series' modified base circle gives more lift at the same duration, but requires uprated valve springs and Race shims. The M series runs with standard components.
The M series Original base circle
| Profile | Stage | Application | Working range | Duration / Lift |
|---|---|---|---|---|
| M1Street | Standard | Daily driving | 700-5 800 v/m | 244° / 9.2 mm |
| M2Street+ | Stage 1 | Sport / cruise | 900-6 200 v/m | 252° / 9.8 mm |
| M3Race | Stage 2 | Road racing | 1 400-6 600 v/m | 260° / 10.4 mm |
| M4Race | Stage 2 | Road racing | 2 000-7 000 v/m | 268° / 11.0 mm |
| M5Race+ | Stage 3 | Sprint / track | 2 800-7 400 v/m | 276° / 11.6 mm |
| M6Drag | Stage 3+ | Track only | 3 500-7 800 v/m | 284° / 12.2 mm |
The MB series Race Modified base circle
| Profile | Stage | Application | Working range | Duration / Lift |
|---|---|---|---|---|
| MB1Street | Standard | Daily driving | 1 200-6 400 v/m | 256° / 10.0 mm |
| MB2Street+ | Stage 1 | Sport / cruise | 1 800-6 800 v/m | 264° / 10.6 mm |
| MB3Street+ | Stage 1 | Sport / cruise | 2 400-7 200 v/m | 272° / 11.2 mm |
| MB4Race | Stage 2 | Road racing | 3 000-7 600 v/m | 280° / 11.8 mm |
| MB5Race | Stage 2 | Road racing | 3 600-8 000 v/m | 288° / 12.4 mm |
| MB6Race+ | Stage 3 | Sprint / track | 4 200-8 400 v/m | 296° / 13.0 mm |
| MB7Race+ | Stage 3 | Sprint / track | 4 600-8 800 v/m | 302° / 13.4 mm |
| MB8Drag | Stage 3+ | Track only | 5 000-9 200 v/m | 308° / 13.8 mm |
| MB9Drag | Stage 3+ | Track only | 5 400-9 600 v/m | 314° / 14.2 mm |
Questions & answers about the B230
What we hear most often from B230 owners.
What does it cost to rebuild a B230?
A cylinder head reconditioning costs roughly 4 000 - 6 000 kr (labour), a complete engine reconditioning roughly 18 500 - 29 500 kr. On top of that come parts (gasket, bearings, piston rings etc.), typically 5 000 - 15 000 kr depending on condition.
How long does a reconditioned B230 last?
With a properly executed rebuild and regular maintenance: 200 000 - 300 000 km or more. The cast-iron block is extremely wear-resistant. A quality rebuild with OEM parts is in practice like getting a new engine.
What are the most common faults on the B230?
A head gasket that blows (especially at cylinders 2-3), camshaft wear at high mileage, and valve guide wear that gives blue smoke on start-up. See our full list under “Common faults” above.
Can you tune a B230?
Absolutely. The B230 is one of the most popular engines to build on in Scandinavia. The cast-iron block takes enormous loads - up to 350 hp on standard bearings, and 600+ hp with forged internals and a turbo.
Should you rebuild or replace the engine?
For the B230: rebuild it. A used engine has an unknown history and may have the same problems. A reconditioned engine is in practice new - with known tolerances, new wear parts and a 12-month warranty.
How do I know if my B230 needs rebuilding?
Typical signs: oil consumption over 0.5L/1000 km, blue/white smoke, poor compression (<10 bar), knocking from the engine, or coolant in the oil. A compression and leak-down test is the surest way to tell.
How long does a B230 rebuild take?
Cylinder head reconditioning: roughly 3-5 working days. Complete engine reconditioning: roughly 2-4 weeks depending on scope and parts availability. We ship worldwide.
Do you have a B230 that needs looking at?
Call us directly or send in a quote request. We reply within 24 hours.