BMW 54-series engines have replaced the outdated S50 engine. The motor has been modified and modified in some parts. The designers decided to lighten the power unit for the sake of increasing dynamics.

Characteristics and features of motors

The M54V30 engine received a 6-cylinder block and a modified head, compared to its predecessors. The block is made of aluminum, in which there are cast-iron sleeves measuring 84 mm. In the block itself there is a new crankshaft with a long stroke. Connecting rods are forged, reinforced.

BMW X3 with M54B30 engine.

The cylinder head has received quite significant changes. Changed camshafts, now it's 240/244 lift 9.7/9, new injectors, electronic throttle, Siemens MS43/Siemens MS45 control system (Siemens MS45.1 for US).

Consider the main technical characteristics of the motors of the M54V30 series:

Service

Maintenance of M54V30 motors is no different from standard power units of this class. Maintenance of engines is carried out at intervals of 15,000 km. Recommended maintenance should be carried out every 10,000 km.

Engine M54B30.

Typical malfunctions

With all the correctness and reliability of the motor, the only drawback is the high consumption, which cannot be reduced in any way, as well as oil consumption. This problem is solved by replacing the oil scraper caps.

Repair of the block head M54B30.

It is common for BMW engines to overheat. In the event of a malfunction, it is worth changing the thermostat, as well as carrying out diagnostic operations to determine a possible leak from the pipes or the water pump.

Conclusion

The M54V30 engine is a fairly reliable and high-quality engine. As for repairs, it is recommended to contact a service station, but most motorists carry out repair and restoration work on their own.

Greetings to all BMW lovers. I have a 525i E39 M54 engine
I want to share information about the ventilation of the M54 engine.
I recently had an unfortunate situation. I went with my family to the Black Sea, drove 1600 km. and suddenly the check light comes on, the car has become dull, the speed is not gaining more than 3000, what to do ???, I found an electrician at the place, the diagnostics show errors in the operation of 1,2,3 cylinders, we swap the spark plugs and coils, we reset the errors - the result is similar, the car drives but not at all like it usually does, troit at idle, does not accelerate, the next day I went to the electrician again, washed the nozzles, changed the fuel filter, checked the fuel pump , the result is the same. The method of collecting information, logical reasoning, etc. came to the conclusion that the problem with the catalyst on the first exhaust manifold (just 1,2,3 cylinders). They removed the exhaust manifolds, cut out the catalysts, put the manifolds in place, started it up and, lo and behold, everything seemed to work, and with a little anxiety I went to the boarding house to rest. three days later we were going to leave home along the way we stopped by an electrician, he threw off the mistakes and we drove off. traveled 600 km. and the check came on again. Luckily relatives live in the area.
the next day in the morning I start the engine - its sausage is not childish, there is no food for a hundred officials there, I had to go on the advice of a familiar master. during the consultation, quite by accident, with the engine running, I unscrew the oil filler cap, and you won’t believe it sucks into the engine, but with such force that I strained to remove it. specialist diagnosis - the engine does not breathe. no one knows how to solve this problem, we decide to remove the intake manifold and clean all the pipes associated with the ventilation system. dismantled the floor of the motor, removed the manifold, found a valve under it and three tubes were connected to it, one comes from the timing cover, the second goes to the intake manifold, and the third is connected to the fitting welded to the pipe of the moss measuring probe. we remove everything, unscrew the probe from the block, wash it in a solarium, clean it, by the way, the fitting in the probe was clogged so I had to heat it with a cutter to clean it. we collect everything, I start the engine with my eyes closed ... eureka everything works fine, it doesn’t troit, it worked for a minute, the check light came on. I tried to open the lid of it as it sucked in and sucked in. Well, I just oh ... ate from such surprises, I decided to rev. thank God that I didn’t have to, soso-white smoke suddenly poured out of the exhaust, and in such a quantity that it was enough to smoke the entire TNK gas station. I found a betrayal of officials for 100 km. from the place loaded on the tow truck went. their local specialist immediately said we change the valve and tubes and we'll see. one hour later, my torturer again became my favorite car.

epilogue. ​

if you notice that
1-when opened, it sucks in the oil filler cap while the engine is running.
2-wrong idling
3-increased oil consumption
4-oil smoke suddenly came out of the chimney
feel free to change the engine ventilation valve and clean or change the tubes and be sure to fit the fitting on the dipstick.
all the pleasure of the officials will cost 150-200 dollars.

Well, that's all. watch the motor.

BMW M54B25 engine

Characteristics of the M54V25 engine

Reliability, problems and repair of the BMW M54B25 engine

A very popular 2.5-liter representative of the M54 series (which also included, and) appeared in the BMW production line in 2000 and replaced it. Differences between the M54 and the M52: the cylinder block of the new engine remained old, aluminum with cast-iron sleeves and with a cast-iron crankshaft, connecting rods (145 mm) changed, light pistons appeared.
The cylinder head remained the same with double vanos, the long intake manifold was replaced with a new short one (-10 mm from M52TU) with wide DISA channels, which made it possible to increase power and let the engine breathe freely. In addition, a 64 mm electronic throttle and a Siemens MS43/Siemens MS45 control system (Siemens MS45.1 for US) are used.
This motor was used on BMW cars with an index of 25i.
Between 2005 and 2006, the M54B25 engine began to be replaced by the next generation of inline sixes, with a working volume of 2.5 liters -.

Problems and disadvantages of BMW M54B25 engines

The problems of the M54B25 are in many ways similar and completely repeat the shortcomings of the older model M54B30, you can learn about them. In general, buying an M54B25 engine for a swap in an E30 or E36 is a good decision, the engine is reliable and durable.

BMW M54B25 engine tuning

Stroker 3 l

One of the most common methods for increasing power on a 2.5 M54 is to convert it into a 3-liter engine (Stroker). To increase the displacement, we need to buy a crankshaft, connecting rods, pistons, the entire intake, intake camshaft, injectors and brains from. After such a stroker kit, the power will increase to 230 hp.
For even more power, you need to buy Schrick sports camshafts with a phase of 264/248 and 10.5/10 mm of lift, a cold intake, an equal length exhaust manifold and a full straight-through exhaust. After tuning, we get about 260-270 hp.

M54B25 Turbo

To build the M54B25 Turbo, it is necessary to repeat all the procedures that were performed with the M52B28. Standard M54 pistons and connecting rods will handle about 400 hp.

M54B25 Compressor

An alternative to all of the above can be the purchase of a good compressor kit from ESS, which is installed on standard pistons and produces ~ 300 hp. Its huge minus is the price, which is unaffordable for most owners of M54 engines.

ENGINE BLOCK

Bolts (M10) for fastening the crankshaft main bearing caps (replace the bolts, do not wash off the coating of the bolts and lubricate with engine oil) - 20 N.m + 70 °;
. Rigidity liner (stretch):
- M8 22 N.m;
- M10 43 N.m.
. Plug (M14x1.5) coolant drain - 25 N.m.
. Threaded plug (M12x1.5) of the main lubrication channel - 20 N.m;
- all M16x1.5 34 N.m;
- all M18x1.5 40 N.m.
. Oil nozzle, bolt (M8x1.0) - 12 N.m.

CYLINDER HEAD

Cylinder head cover:
- all Mb 10 N.m;
- all M7 15 N.m.
. Threaded plug (M 12x1.5) of the lubrication channel - 20 N.m;
. Air bleed screw - 2.0 Nm
. Bolts (M10) for fastening the cylinder head (replace the bolts, wash them, do not wash off the coating of the bolts, and lubricate with engine oil) - 40 N.m + 90 ° + 90 °.

OIL PAN

Oil drain plug:
- all M12x1.5 25 N.m;
- all M18x1.5 30 N.m;
- all M22x1.5 60 N.m;
. Oil sump to cylinder block:
- ace Mb (8.8) 10 N.m;
- all Mb (10.9) 12 N.m;
- all M8 (8.8) 22 N.m.
timing cover
. Timing block and its upper and lower covers:
- all Mb 10 N.m;
- all M7 15 N.m;
- all M8 22 N.m;
- all M10 47 N.m.

CRANKSHAFT WITH SUPPORT

Gear wheel of the speed sensor of the KSUD to the crankshaft, replace the bolts:
- all M5 (10.9) 13 N.m;
- all M5 (8.8) 5.5 N.m.

FLYWHEEL

Flywheel to the crankshaft of the engine, replace the bolts, with automatic transmission - 105 N.m.

CONNECTING ROD WITH BEARINGS

Replace connecting rod bolts, wash and lubricate with engine oil - 5.0 N.m + 20 N.m + 70 °;
Camshaft.
Camshaft Bearing Cap:
- all Mb 10 N.m;
- all M7 14 N.m;
- all M8 20 N.m.
. Sprocket to camshaft:
- M54 M7 50 Nm + 20j0 Nm;
. Chain tensioner cap nut:
- all M22x1.5 40 N.m.
. Chain tensioner plunger cylinder:
- M54 M26x1.5 70 N.m;
. Camshaft stud into the block head body:
- all M7 20 N.m.
. Camshaft stud nut:
- all Mb 10 N.m.

INTAKE VALVE PHASE VARIO, VANOS

Hollow bolt (M 14x1.5) of the actuating unit - 32 N.m.
. Threaded plug (M22x1.5) of the actuating unit - 50 N.m.
. Precision bolt (Mb, left-hand thread) of the tensioner plunger into the splined shaft -10 N.m.
. Pipeline to oil filter support - 32 N.m.
. Actuating unit to the camshafts of the intake and exhaust valves (replace the bolts M 10x1.0) - 80 N.m.

LUBRICATION SYSTEM

Oil pump to crankcase, M8 bolt—23.0 N.m.
. Oil pump cover (Mb) - 10 N.m.
. Sprocket to oil pump:
- all Mb 10 N.m;
- all M10x1 25 N.m;
- all M10 45 N.m.
. Full flow oil filter (cap):
- all M8 22 N.m;
- all M10 33 N.m;
- all M12 33 N.m;
- screw cap 25 N.m.
. Oil filter housing and pipelines to the crankcase:
- all M8 22 N.m;
- all M20x1.5 40 N.m.
. Oil line for lubrication of bearing beds and camshaft cams:
- all Mb 10 N.m.
. Camshaft cam lube oil line to cylinder head (hollow bolt):
- all M5 5 N.m;
- all M8x1 10 N.m.
. Oil lines from oil cooler to oil filter housing:
- all M8 22 N.m.

COOLING SYSTEM

Coolant pump to crankcase:
- all Mb 10 N.m;
- all M7 15 N.m;
- all M8 22 N.m.
. Fan drive coupling to coolant pump (swivel nut with left-hand thread):
- all 40 N.m.
. Thermostat housing:
- all MB 10.0 N.m.
. bleed valve:
- all M8 8.0 N.m.

INTAKE MANIFOLD

Intake manifold to cylinder head:
- all Mb 10 N.m;
- all M7 15 N.m;
- all M8 22 N.m.

EXHAUST MANIFOLD

Exhaust gas outlet pipe (manifold) to the cylinder head, replace nuts, lubricate threaded connections with copper-containing paste of the Molykote-HSC type:
- all Mb 10 N.m;
- all M7 20 N.m;
- all M8 23 N.m;
. Oxygen content sensor in the exhaust gas, M18x1.5—50 N.m.

IGNITION SYSTEM

Spark plug:
- all M12x1.25 23 ± 3 N.m;
- all M 14x1.25 30 ± 3 N.m.
. Ignition ECU
- all 2.5 N.m.
. Knock sensor:
- all 20 N.m.
. The crankshaft speed sensor and its position at the TDC of the first cylinder, the bolt (Mb) must be replaced - 10 N.m.
. Control electronics cover - 4.4 N.m.

GENERATOR

Wires to the generator:
- contact D + Mb 7 N.m;
- contact B + M8 13 N.m.
. Alternator pulley - 45 N.m.
. Clamp rear 3.5 N.m.
. Cylindrical wire retainer bolt - 3.5 N.m.
. Voltage regulator:
- all M4 2.0 N.m;
- all M5 4.0 N.m.

STARTER

Fastening the starter to the gearbox housing - 47 N.m.
. Support bracket to the starter - 5.0 N.m.
. Support bracket to crankcase - 47 N.m.
. Starter wires:
- all M5 5.0 N.m.
- all MB 7.0 N.m.
- all M8 13 N.m.
. Heat shield to starter - 6.0 N.m.

WIRING HARNESS AND ENGINE ELECTRICAL

Conclusion "+" AB to the contact in the engine compartment - 21 N.m;
. Sensors for oil pressure, oil temperature and oil level - 27 N.m;
. Coolant temperature sensor - 20 N.m.
. Inlet air temperature sensor - 13 N.m.
. Air flow meter - 4.5 N.m.
. Camshaft position sensor - 4.5 N.m; Fuel supply system.
. Fuel tank to the body on the tie-down band:
- all (bolt) M8 20 N.m;
- all (nut) M8 19 N.m.
. Coupling tape M8 20 N.m.
. Loop to fuel pump:
- all M4 1.2 N.m;
- all M5 1.6 N.m.
. Hose clamps:
- all (10-16 mm) 2.0 N.m;
- all (18-33 mm) 3.0 N.m;
- all (37-43 mm) 4.0 N.m.
. Filler neck to the body, Mb—9.0 N.m.
. Activated carbon filter - 9.0 N.m.
. Dust filter -1.8 N.m.
. Retaining ring of the sensor of the fuel level indicator - 45 ± 5 N.m.
. Drain plug in the fuel tank:
- all 25 N.m.
. Accelerator pedal module to the body - 19 N.m.

COOLING SYSTEM

Coolant hose clamps, 032-48 mm - 2.5 N.m.
. Screw for removing air from the cooling system - 8.0 N.m.
. Radiator to the body, Mb—10 N.m.
. Radiator drain plug - 2.5 N.m;
. Expansion tank to the body - 9.0 N.m.
. Oil cooler to the body - 14 N.m.
. Pipelines to the automatic transmission oil cooler - 25 N.m.
. Oil cooler pipe brackets - 10.0 N.m.
. Cap hook (M18x1.5) of the oil pipe fitting to the automatic transmission and radiator - 20 N.m.
. Hollow oil pipe bolt:
- M14x1.5 27 N.m;
- M16x1.5 37 N.m.
. Branch pipes (pipelines) of the oil cooler to the automatic transmission
- M14x1.5 37 N.m;
- M16x1.5 37 N.m.
exhaust system.
. Silencer clamp - 15 N.m.
. Front muffler to rear muffler - 30 N.m.
Engine mount.
. Engine mounting pad to the front axle beam - 19 N.m.
. Engine mounting pad to the engine support bracket - 56 N.m;
- 100 N.m.
. Engine mount bracket to engine:
- all M8 (8.8) 19 N.m;
- all M10 (8.8) 38 N.m.