With liners (set of spare parts - plain bearings);

41-0401-2 - Crankshaft;

41-04s3-2 - Crankshaft assembly;

4T6-04s8 (or 6T6-04s7) - Inserts for main bearings;

6T2-0416-1 - Lower main bearing shell

4Т6-04с9 - Set of main liners.

The crankshaft is designed to complete the A-41 diesel engine and modifications of engines based on it.

When buying a (new) crankshaft, ask for a certificate of conformity and check the manufacturer's terminals, as well as the supplier's terminals on the shaft housing. During transportation and storage, it is necessary to monitor the safety of the working surfaces of the crankshaft and protect them from thermal (do not overheat), mechanical ( do not hit, do not scratch), corrosive (do not wet) and other damage.

Crankshaft journals are available in nominal sizes. Repair of the A-41 crankshaft is carried out by highly qualified specialists with extensive experience using modern equipment. Rated and repair dimensions shaft are specified in tables 1 and 2. The plant provides a different combination of connecting rod and main shaft journals. The manufacturer indicates the size group on the 7th shaft neck. In the event that the crankshaft comes out of the factory with a nominal value of 1m, there is no marking on the necks. The manufacturer balances the crankshaft in dynamic mode. In this case, the imbalance is not more than 160 g cm.

Table 1. Connecting rod journals of the crankshaft

Marking of size groups	Diameter of necks of the crankshaft, mm				Insert thickness, mm
	The size	Tolerance	The size	Tolerance	The size	Tolerance
				0,127 +0,076		0,038 -0,048

Table 2. Crankshaft journals

Marking of size groups	Diameter of necks of the crankshaft, mm		Int. bearing diameter, mm		Insert thickness, mm
	The size	Tolerance	The size	Tolerance	The size	Tolerance
	104,98	0,022		0,137 +0,096		0,048 -0,058
	104,73		104,75		5,625
	104,48		104,5		5,75
	104,23		104,25		5,875
	103,98
	103,73		103,75		6,125

1. Preparation for installation of the crankshaft of the A-41 engine

1.1. Unpack the shaft: remove the grease, remove the plugs (oil pockets), get rid of the remains of conservation, rinse the shaft (preferably under pressure), dry by blowing compressed air, install plugs. The protrusion of the plugs above the surface of the crankshaft is not allowed.

Important! In the event that after re-preservation you find a discrepancy in the size of the shaft necks, the location of the oil channels, or the absence of oil channels, corrosion on the necks and similar defects, then it is strictly forbidden to install the crankshaft on the engine !!!

1.2. From the rear side, an oil deflector is pressed onto the shaft flange. The concave side of the flange is turned towards the shoulder of the flange. Stop the oil deflector by pressing the metal of the oil deflector into the recesses (four recesses) on the shaft. Clearance between the ends of the oil deflector and the thrust end crankshaft up to 1mm.

2. Requirements for contacting parts

2.1. In order to increase the service life and prevent premature failure of the crankshaft. It is also necessary to make sure that the mating parts in the assembly are suitable for unfounded claims. Parts rejected according to the technical specifications of the State Scientific and Technical Institute for the defectiveness of parts of the A-41 engine are not subject to installation.

2.2. The connecting rod and main bearing shells must match the dimensions of the crankshaft journals (see tables 1 and 2).

The corresponding designation of the set of connecting rod and main bearings:

• A23.01-93-41SB (41-03s4-2) - connecting rod bearings;
• A23.01-116-41SB (4T6-04s9) - root liners.

2.3. The choice of the diameter of the half rings is based on the diameter of the 5th main neck.

2.4. Static imbalance of the crankshaft pulley is not more than 75 g cm.

2.5. Static imbalance of the flywheel assembly with oiler and screws is not more than 50 g cm.

2.6. The caps of the main bearings of the engine crankshaft must clearly fit into seats block. The original position of the main bearing caps must not be allowed to change.

2.7. Mismatch between the ends of the cover of the 5th main bearing relative to the ends of the engine crankcase support is not allowed. The gap between the ends of the cover of the 1st main bearing and support with inside up to 0.5mm.

2.8. The mass deviation of connecting rods on one engine does not exceed 17 grams.

2.9. Changing the position of the paired bottom caps of the connecting rods is not allowed.

2.10. The mass deviation of the pistons of one engine does not exceed 20 grams.

2.11. The deviation of the mass of the piston pins, one engine, does not exceed 10 grams.

3. Requirements for the assembly of the A-41 engine

3.1. Clean the parts selected for engine assembly from conservation, dust, dirt, water and other undesirable coatings.

3.2. The rubbing surfaces of parts such as: main and connecting rod journals of the crankshaft, liners and thrust half rings, during installation, wipe with a rag and grease diesel oil, and apply a layer of grease on the working surfaces of RTI (rubber of technical products).

3.3. It is necessary to align the oil holes in the liners with the oil guide channels of the engine. Also, combine the locks of the liners with the grooves of the beds in the block.

3.4. The bearing fastening bolts are tightened starting from the third main bearing, while the tightening torque is 402-431 N m (41-44 kgf m p).

3.5. After tightening the bolts of the main bearings of the crankshaft of the A-41 engine, the turning force in the bearings should not exceed 49 N m (5 kgf m). The play (longitudinal) of the crankshaft in the half-rings of the thrust bearing does not exceed 0.093-0.380 mm. In main bearings, the clearance does not exceed 0.116-0.180 mm.

3.6. The connecting rod bolts are tightened, starting with a long bolt, with a torque of 216-235 N m (22-24 kgf m).

3.7. The constriction of the connecting rod along the neck of the crankshaft is free from the "hand". Backlash (longitudinal) of the lower head of the connecting rod fixed on the neck of the crankshaft in the range of 0.24-0.70 mm.

3.8. After tightening connecting rod bearings the crankshaft must rotate with a force of no more than 186 N m (20 kgf m).

4. Run-in and testing of the A-41 engine

Attention! The engine must only be put into operation after a preliminary run-in.

4.1. Running in is necessary for running in all rubbing surfaces.

4.2. The running-in of the A-41 engine is divided into stages:

• 1st stage - running in at low speed for 1.5-2 hours;
• Stage 2 - running-in at nominal speed on a running tractor for 60 hours.

4.3. The run-in is carried out in accordance with the factory's current technical documentation for the A-41 engine.

4.4. The break-in process is accompanied by listening to the engine, visual observation of the engine operation, and, if necessary, eliminating the detected malfunctions. After the break-in is completed, maintenance and oil change in the engine are carried out.

Copying from the site is possible with a backlink to the site

Engine - a motor manufactured by JSC "Altai Motor Plant". Diesel power units designed for installation on special equipment, as well as industrial tractors, bulldozers and other construction vehicles.

Specifications

Class A01 motors have high specifications and reliability. This power unit it is not equipped with a turbocharger, but at the same time, diesel power is more than enough. This power unit replaced the well-known SMD-7. The engine was developed back in the middle of the 60s according to the drawings of the Kharkov Hammer and Sickle plant.

At this moment, a modernized version of the A-01 MRSI-1 engine is being produced. It is used on Tractor -T-4A, TT-4, TT-4M, Motor grader DZ-122, DZ-143, DZ-180, Loaders TO-18, TO-28, Excavator EO-121, EO-4124, Road pavers DU-58, DU-62, as well as MTP-71A, MTP-7, LP-19A.

Excavator with motor A01

Main technical characteristics:

Naturally aspirated diesel engines of type A-01 are equipped with 2 valve mechanism gas distribution. Differ in simplicity of a design and reliability. Diesel engines comply with GOST R 41.96-2005 in terms of emissions of harmful substances.

Loader with A01 engine

In diesel engines, liners made of special cast iron with working surface treatment by flat-top honing are used, pistons with a three-ring set piston rings, optimized side profile and graphitized skirt, crankcase with increased strength and improved cooling of cylinder liners.

Improvements in the design of diesel engines made in recent years have made it possible to reduce oil consumption for waste and increase engine life up to 12,000 hours.

The following options are also available upon request:

A01 series motor

• clutch;
• exhaust silencer;
• liquid-oil heat exchanger for cooling engine oil;
• generator with a power of 800 W to 3000 W and a voltage of 12 or 24 V;
• pneumatic compressor with belt drive;
• electric torch preheating air;
• two hydraulic pumps of the NSh-10 and NSh-32 types.

Maintenance and repair

Maintenance of the A01 motor is quite simple. We can say that it is similar to all diesel power units, such as YaMZ. Maintenance is carried out every 12-15 thousand kilometers. This indicator includes changing the engine oil and filter element. Also, it is recommended to check the ignition and the condition of the air filter. Do not forget that the change of the air element is carried out every second Maintenance.

The engine is not particularly whimsical in the use of fuel and engine oil. So, for normal operation, any more or less high-quality mineral lubricant is suitable. As practice shows, usually motorists pour oil such as M10 into the engine. It perfectly performs all the necessary functions, as well as with timely replacement well protects the engine parts. Special attention it is recommended that air filter. It is best to take a quality product with a metal base.

Conclusion

The A01 motor has become quite widespread in construction and agricultural vehicles. So, some motorists even installed the power unit on the ZIL 131. Interservice maintenance is quite simple, since the power unit has simple design features.