Saab B205 Rebuild, common faults & everything you need to know
Complete guide to Saab's 2.0-litre turbo four with Trionic T7 - a chain-driven DOHC with twin balance shafts. From balance-chain wear to 320-horsepower builds, with factory-verified torque figures and workshop pricing.
We have built and reconditioned Saab's turbo fours for decades. The B205 is the Trionic T7 evolution of the B204 - a 2.0-litre DOHC 16v turbo engine with a cast-iron block, aluminium cylinder head, timing chain and twin balance shafts. The bottom end is robust, but it demands proper maintenance. Neglected oil changes produce oil-coke sludge that starves the oil feed to both the turbo and the chain tensioner, the balance chain and its guides wear, and the turbocharger is a wear item at high mileage. The B205 is also an interference engine, so a chain failure bends valves. We handle everything from cylinder head reconditioning to complete engine reconditioning with our own machine shop and a 12-month warranty.
The B205 at a glance
Data for the B205 series. Torque figures read from Saab's factory manual (Saab WIS) and cross-verified.
| Variant | Displacement | Power | Torque | Forced induction |
|---|---|---|---|---|
| B205E Turbo | 1 985 cc | 150 hk | 240 Nm | Garrett GT1752S |
| B205L Turbo | 1 985 cc | 185 hk | not published | Garrett GT1752S |
| B205R Turbo | 1 985 cc | 205 hk | not published | Mitsubishi TD04HL |
Torque is stated only where it is factory-verified. The B205E's 240 Nm is cross-verified; the B205L and B205R make higher torque, but the exact peak figures vary between sources and are therefore not stated here. The 8.8:1 compression is factory-read for the B205E (variants with higher boost use lower values, not factory-confirmed in our sources).
Torque specs
Read from Saab's factory manual (Saab WIS, tightening torques, 4-cyl petrol) and cross-verified. Stretch bolts (cylinder head, main bearing, connecting rod) are angle-tightened - always fit new ones. Some torques differ between the 9-5 (9600) and 9-3 (9400/9440) platforms; always use the value for the correct chassis.
Cylinder head & valvetrain
Engine block & bottom end
Timing chain & balancer shafts
Intake, exhaust & turbo
Note - Stretch bolts: head, main bearing and connecting rod bolts are angle-tightened stretch bolts (TTY). Saab specifies new bolts, and Meksta always fits new bolts on disassembly. The reason: stress accumulation is invisible and the cost of new bolts is negligible against the risk of failure.
NOTE - connecting rod bearing, nut vs bolt: The B205 comes with two variants of big-end bearing. The nut type is tightened 20 Nm + 70°, the bolt type 25 Nm + 100°. Always choose the value to match the fastener actually fitted to the connecting rod.
NOTE - Flywheel differs by generation: The 9-5 (9600) is tightened 80 Nm with Loctite 270, while the 9-3 (9400/9440) uses an angle method 20 Nm + 50° with thread lock (Saab part number 74 96 292). This is a genuine revision of the procedure, not an average - use the spec for the exact chassis and model year.
NOTE - B205 bearings supersede the B204: The B205/B235 has its own main-bearing and connecting-rod torques. The older B204/B234 values that circulate on forums do NOT apply to the B205 - using them is a mistake. Always use B205-specific values.
NOTE - twin balancer shafts: The B205 has two chain-driven balance shafts with their own idler sprocket and their own chain tensioner. Check the balance chain, the sprockets and the guides at every cylinder head or engine rebuild.
Factory tolerances (bearing clearance, deck height, piston clearance) for the B205 are documented separately and published once they are cross-verified. Every dimension is measured against factory tolerances with our own machine shop.
Common faults on the B205
This is what we see most often when a B205 comes in. Symptoms, causes and how we fix them.
Oil coking sludge from neglected oil changes
Neglected maintenance • High- Symptoms
- Low oil pressure, noise from the chain tensioner, turbo failure, and in the worst case bearing damage. Thick sludge in the valve cover and oil pan.
- Cause
- The Trionic turbo runs the oil hot. With oil-change intervals too long or the wrong oil, oil-coke sludge forms and starves the oil feed to the turbo, chain tensioner and bearings. A classic and serious Saab problem.
Balancer chain and guides wear
High mileage • High- Symptoms
- Rattle and clatter from the timing chain side, especially on cold start. Fault codes for camshaft position. Risk of a jumped chain.
- Cause
- The B205 has a separate balance chain with an idler sprocket and tensioner. The chain, the guides and the tensioner wear over time, made worse by low oil pressure from sludge. Left untreated the chain can jump and drive valves into pistons.
Turbo failure (axial play, oil smoke)
150 000+ km • High- Symptoms
- Whistling, blue smoke, lost boost, axial play in the turbo shaft, oil leakage in the boost hoses.
- Cause
- The turbocharger (Garrett GT1752S or Mitsubishi TD04HL) is a wear item. Worn bearings and seals after high mileage, often accelerated by oil-coke sludge and poor oil feed.
DI cassette (ignition cassette) fails
Common • Medium- Symptoms
- Misfire, rough running, starting problems, warning light. The engine may run on three cylinders or refuse to start.
- Cause
- Trionic T7 uses a DI cassette (Direct Ignition) on top of the spark plugs instead of separate coils. The cassette is a known wear item that cracks and loses insulation with age and heat.
Oil leakage (valve cover & crankcase ventilation)
Common • Medium- Symptoms
- Oil around the valve cover, oil smell, drips under the engine, oil mist in the intake. Sometimes elevated crankcase pressure.
- Cause
- Aged gaskets in the valve cover and a clogged or cracked crankcase ventilation (PCV). Common and not serious in itself, but oil on hot exhaust and turbo parts is a fire risk and should be addressed.
Big-end and main bearing wear
High mileage • Critical- Symptoms
- A knocking noise from the lower engine under load, low oil pressure, metal shavings at oil changes.
- Cause
- Worn bearing shells after high mileage, oil starvation from sludge or neglected oil maintenance. Requires crankshaft grinding and new bearings.
B205 Rebuild Pricing
Pricing based on B205 specifications: 4-cyl inline, 90 mm bore, 16 valves, 5 main bearings + 4 rod bearings. We carry out cylinder boring, crankshaft grinding and cylinder head resurfacing with our own machine shop. All prices exclude VAT and parts.
Cylinder head reconditioning
Bottom end
Full rebuild
Performance
Cylinder machining (4-cyl, 90 mm bore)
| Service | Price |
|---|---|
| Cylinder boring 4-cyl inline block (90 mm) | 3 318 kr |
| Plateau honing 4 cyl | 1 050 kr |
| Stress boring 4 cyl | 4 603 kr |
| O-ringing block 4 cyl (high-boost) | 2 800 kr |
| Deck decking block 4 cyl | 1 974 kr |
Crankshaft work (5 main + 4 big-end, 8 counterweights)
| 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 10 pcs (DOHC) | 3 080 kr |
| Remove/fit counterweights 8 pcs | 2 044 kr |
Valve reconditioning (16 valves)
| Service | Price |
|---|---|
| Cutting 16 valve seats (standard) | 1 820 kr |
| Cutting 16 valve seats (large) | 2 772 kr |
| Valve guide replacement 16 pcs (light alloy) | 2 548 kr |
| Manufacture of valve seat inserts 16 pcs | 3 080 kr |
| Bronze sleeves fitting 16 pcs | 2 268 kr |
Resurfacing (I4, standard head size)
| 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 |
Con-rod work (4 pcs)
| 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 |
| Replace piston ring 4 pcs | 1 106 kr |
| Resizing big-end housing 4 pcs | 2 352 kr |
| Check/straighten 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 |
Indicative pricing for the B205 configuration (4-cyl inline, 90 mm bore, 16 valves, alloy head, cast-iron block). Labour prices excl. VAT and parts (piston rings, bearings, gaskets, stretch bolts). Request a quote for an exact price after inspection.
Tuning the B205
The B205 is a turbo engine with excellent potential. Trionic T7 responds well to mapping, and the robust cast-iron bottom end takes boost well - the big power comes via a larger turbo on forged internals.
- 1
Trionic remap & flow
A thorough Trionic T7 remap with freer intake and exhaust gives a clear gain straight away on the stock bottom end, with better response and boost.
230-250 hk - 2
Upgraded turbo & fuel
A larger or reconditioned turbo, a better intercooler and fuel system with a matched map. The stock bearings handle moderately raised boost well with the right margins and turbo work.
260-290 hk - 3
Forged internals + larger turbo
Forged pistons and con-rods, ARP bolts, balancing and a larger turbo. This opens the power window right up.
300-320 hk - 4
Full build
A complete bottom end, a ported cylinder head and a big turbo for track and drag. We build the whole chain in-house with performance engine building.
320+ hk
Questions & answers about the B205
What we hear most often from Saab owners.
What does it cost to rebuild a Saab B205?
A cylinder head reconditioning costs about 5 000 - 7 000 SEK (labour), a complete engine reconditioning about 19 500 - 30 500 SEK. On top of that come parts (gasket, bearings, piston rings, stretch bolts), typically 7 000 - 18 000 SEK depending on condition and variant. We give a fixed quote after inspection.
Is the Saab B205 an interference engine?
Yes. The B205 is an interference engine. If the timing chain or balance chain jumps, the valves strike the pistons, which bends valves and often causes consequential damage. That is why the guides and tensioners of the timing chain and balance chain are critical - we check and replace them during a rebuild.
What is the difference between the B204 and B205?
The B205 is a further development of the B204 with Saab Trionic 7 (T7) engine management instead of Trionic 5/5.5. Both are 2.0-litre DOHC 16v turbo engines with a cast-iron block, aluminium cylinder head, timing chain and twin balance shafts. One important difference for the workshop: the B205/B235 has its own main-bearing and connecting-rod torques that supersede the older B204/B234 values - never mix them up.
How long does a rebuilt B205 last?
With a correct rebuild and regular maintenance: 250 000 - 300 000 km or more. The bottom end is durable. The most important thing is frequent oil changes with the right oil, so the turbo, balancer chain and bearings are not starved by oil coking sludge.
Can you tune a B205?
Yes. The B205 is a turbo engine and responds very well to tuning. A Trionic T7 remap gives a clear gain straight away. On stock bearings people often build 240-280 hp, and with forged internals and a larger turbo 320 hp and more. The robust cast-iron bottom end is a strong base for boost builds.
What is the sludge problem on the B205?
The turbo engine runs the oil hot. With oil-change intervals too long or the wrong oil, oil-coke sludge forms and starves the oil feed to the turbo, chain tensioner and bearings. It is a classic and serious Saab problem. We clean, replace wear parts and recommend frequent oil changes with the correct specification as part of a rebuild.
Should you rebuild or replace the engine?
For the B205: usually rebuild. A used engine has an unknown history and the same wear points (sludge, balance chain, turbo). A rebuilt engine has known tolerances, new wear parts and a 12-month warranty. We ship worldwide.
See also: Volvo's turbo four Volvo T5 Whiteblock and the classic Volvo B230. We service Swedish turbo engines from Saab and Volvo, from rebuilds to performance builds.
Have a B205 that needs looking at?
Call us directly or send in a quote request. We reply within 24 hours.