MAN Engine Crankshaft Repair Archives - Crankshaft Grinding Repair

Bearings For Yanmar | Daihatsu | MAK | MAN

crankshaft — Mon, 16 Dec 2024 10:44:06 +0000

Bearings for Popular Make of engines installed on vessels, such as main engines or auxiliary engines, are available with RA Power Solutions.

RA Power Solutions is a leading onsite crankshaft repair company, extending services for over 44 years all over the world. We understand the requirement of standard and undersize bearings especially after the grinding of the crankshaft is executed it is difficult to get the undersize bearings, as their delivery period is long and it is not possible for the ship owner to hold the vessel indefinitely.

RA Power Solutions in order to facilitate clients, especially from the shipping industries, maintain a large stock of crankpin/main journal bearings. The bearings are available with us in different undersizes, as recommended by the manufacturer.

In most cases, our technicians hand carry the undersize bearings with them and the same are assembled immediately after grinding of the damaged crankshaft is undertaken, this saves breakdown time. The bearings of most of the popular make and models are available.

A list of a Few Models is given below:

Sr No.	Description
Yanmar Engine S 185L Standard Crankpin Diameter-140 mm
1	a) 0.80 mm Undersized Crankpin Bearing
	b) 1.20 mm Undersized Crankpin Bearing
	c) 1.60 mm Undersized Crankpin Bearing
	d) 2.00 mm Undersized Crankpin Bearing

Yanmar Engine 6N18AL-DN/DV Standard Crankpin Diameter-145 mm
2	a) 0.40 mm Undersized Crankpin Bearing
	b) 0.80 mm Undersized Crankpin Bearing
	c) 1.20 mm Undersized Crankpin Bearing
	d) 1.60 mm Undersized Crankpin Bearing
	e) 2.00 mm Undersized Crankpin Bearing
	f) 2.40 mm Undersized Crankpin Bearing
	g) 2.80 mm Undersized Crankpin Bearing

Daihatsu 6DL -16 Standard Crankpin Diameter-120 mm
3	a) 2.50 mm Undersize Crankpin Bearing
	b) 3.00 mm Undersize Crankpin Bearing
	c) 4.00 mm Undersize Crankpin Bearing

Daihatsu 5DC-17 Standard Crankpin Diameter- 145 mm
4	a) 0.50 mm Undersized Crankpin Bearing
	b) 1.00 mm Undersized Crankpin Bearing
	c) 1.50 mm Undersized Crankpin Bearing
	d) 2.00 mm Undersized Crankpin Bearing
	e) 2.50 mm Undersize Crankpin Bearing
	f) 3.00 mm Undersize Crankpin Bearing
	g) 4.00 mm Undersize Crankpin Bearing

Daihatsu 5DK-20 Standard Crankpin Diameter-170 mm
5	a) 0.50 mm Undersized Crankpin Bearing
	b) 1.00 mm Undersized Crankpin Bearing
	c) 1.50 mm Undersized Crankpin Bearing
	d) 2.00 mm Undersized Crankpin Bearing
	e) 2.50 mm Undersized Crankpin Bearing
	f) 3.00 mm Undersized Crankpin Bearing
	g) 3.50 mm Undersized Crankpin Bearing
	h) 4.00 mm Undersized Crankpin Bearing
	i) 5.00 mm Undersized Crankpin Bearing

Daihatsu 8DKM-28 Standard Crankpin Diameter-235 mm
6	a) 0.50 mm Undersized Crankpin Bearing
	b) 1.00 mm Undersized Crankpin Bearing
	c) 1.50 mm Undersized Crankpin Bearing
	d) 2.00 mm Undersized Crankpin Bearing
	e) 2.50 mm Undersized Crankpin Bearing

MAK 8M20Standard Crankpin Diameter-152 mm
7	a) Standard Undersized Crankpin Bearing
	b) 1.00 mm Undersized Crankpin Bearing
	c) 1.50 mm Undersized Crankpin Bearing
	d) 2.00 mm Undersized Crankpin Bearing

MAN CME 5L 16/24 Standard Crankpin Diameter- 130 mm
8	a) 0.50 mm Undersized Crankpin Bearing
	b) 1.00 mm Undersized Crankpin Bearing
	c) 1.50 mm Undersized Crankpin Bearing
	d) 2.00 mm Undersized Crankpin Bearing
	e) 2.50 mm Undersized Crankpin Bearing

MAN 6L 23/30H Standard Crankpin Diameter-185 mm
9	Key Position 12.5 x 15.5
	a) 1.50 mm Undersized Crankpin Bearing
	Key Position 7.7 x 10.7
	a) 1.50 mm Undersized Crankpin Bearing
	b) 2.00 mm Undersized Crankpin Bearing

MAN 9ASL 25/30 Standard Crankpin Diameter-195 mm
10.	a) 2.50 mm Undersize Crankpin Bearing
	b) 3.00 mm Undersize Crankpin Bearing
	c) 4.00 mm Undersize Crankpin Bearing

We regularly supply engine bearings for crankpins, tri-metal bearings, engine tri-metal bearings, and bearings for all makes and models of engines like Yanmar, Daihatsu, MAK, MAN B&W, etc.

For more information regarding Yanmar, Daihatsu, MAN, MAK bearings, Repair of Crankshaft of Daihatsu, crankshaft bearing journal grinding service, in situ crankshaft grinding and repair of MAN engine, MAN Engine Crankshaft Repair, Repair of crankshaft of MAN Engine contact us at rajshahani@rapowersolutions.com or info@rapowersolutions.com or call us at +91-9582647131 or +91-9810012383.

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MAN Engine Crankshaft Repair By RA Power Solutions

crankshaft — Wed, 26 Jul 2023 09:18:18 +0000

RA Power Solutions was advised about the damage to the crankshaft of MAN B&W 9L27/38 on board the vessel. The vessel was stranded at Lumut Port Malaysia due to the non-performance of the main engine of MAN. We deputed a team of two technicians with the necessary onsite crankshaft grinding equipment to undertake the inspection and repair of the crankshaft.

The details of the Engine are mentioned below

S. NO	Crankshaft Details
1.	Engine Make	MAN Aux. Engine
2.	Engine Model	9L 27/38
3.	Crankpin Diameter Standard	250 mm
4.	Crankpin Bearing Length	96 mm
5.	Place of execution of crankshaft repair	Lumut Port Malaysia

Following are the main observations of the crankshaft of MAN Aux. Engine Model No. 9L 27/38

On visual inspection by our technicians, it was observed that crankpin no. 2 has a deep depression mark measuring about 40 x 25 mm.
The minimum and maximum dimensions of crankpin no. 2 were observed as following
- Standard dimensions of crankpin: 250 mm
- Minimum size observed: 247.80 mm

Thus the ovality of more than 2.2 mm was observed.

Our technicians reported that damage to the Crankpin is more as the micrometer is not able to take the reading due to the nature of the damage. The crank pin was subject to crack detection by MPI and no cracks were observed.
The hardness was taken off the crankpin. The hardness ranging between 260 to 300 on the HB scale was observed. On a few scattered areas, the hardness was as high as 616 on the HB scale.

Damage Crankpin before Repair of MAN Engine 9L 27/38 Crankshaft

Crankshaft Repair MAN Aux. Engine model 9L 27/38

Planning for Repair of Crankshaft of MAN Engine Model No. 9L 27/38

During the discussions with the technical staff of the vessel, it was informed that a crankshaft repair company from Singapore inspected the damaged crankpin no. 2. They observed higher hardness and have undertaken local grinding of the hard spots by a hand grinder. The exact depth of hand grinded area cannot be measured.

The decision was taken by RA Power technicians to undertake grinding of the crankpin.

Our technicians checked the hardness of the crank pin at every step while under-sizing it, to our surprise, the hardness was coming down as the grinding was done.
Our technicians have undertaken the grinding to the undersize of 4.0 mm and the maximum hardness observed is 328 mm.
The damaged crankpin has been successfully repaired.

Onsite Crankshaft Repair

Process of grinding of the crankshaft of MAN Aux. Engine model

Damaged to the crankpin by a Singapore-based company

Due to the lack of knowledge and experience the hand grinder was used to check the hardness which in turn rather damaged the crankpin. A crankshaft is the most expensive part of a diesel engine and experienced companies must be engaged for repair. It is our experience of forty-two years that hardness increases whenever there is a seizure of the bearings and in most cases it is a skin hardness that reduces after grinding is done.

Onsite Crankshaft grinding under progress

After grinding & polishing of damaged crankpin

For guaranteed repair of the crankshaft, MAN engine crankshaft repair, please email us at rajshahani@rapowersolutions.com, or info@rapowersolutions.com, or call us at +91 9582647131 or +91 9810012383.

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MAN 6L 16/24 Crankshaft Grinding On Site | Successful MAN Engine Crankshaft Repair

crankshaft — Mon, 17 Apr 2023 08:05:57 +0000

RA Power Solutions was approached by a vessel owner regarding a problem faced by them in the MAN 6L 16/24 crankshaft auxiliary engine.

The Engine Details are as Follows

S. NO	Crankshaft Details
1.	Engine Make	AUX Engine MAN
2.	Engine Model	6L 16/24
3.	Crankpin Diameter Standard	130 mm
4.	Crankpin Bearing Width	56 mm
5.	Name of Vessel	MV. ZHONG

Our team of two technicians boarded the vessel in Kandla, an Indian port, and inspected the crankshaft.

Following are the main observations of the MAN 6L 16/24 Auxiliary Engine Crankshaft

The crank pin nos. two having a standard diameter of 130 mm was damaged and the minimum diameter observed was 129.79 mm.
From the above reading, the ovality observed was 0.21 mm which is considered to be on the higher side.
Few line marks were observed on the crank pin diameter.
The hardness of the crankpin was checked and was observed between 243 to 276 on the HB scale which is well within the limits.
The crankpin was also subject to a crack detection test by magnetic particle examination and no cracks were observed.
The deflection of the crankshaft was taken and was observed within limits.

Action Taken by RA Power Solutions to Repair Crankshaft of MAN 6L 16/24 Auxiliary Engine

Considering the ovality of 0.21 mm on the crankpin and the deep line/ dent marks observed, the crankpin was undersized to 1.0 mm.
The minimum and maximum diameters observed after grinding were as follows:-
1. Minimum diameter observed – 128.99 mm
2. Maximum diameter observed – 129.00 mm
Ovality maximum – 0.01 mm

Final reports were prepared by our technicians and the engine was put back into operation. The pre and final inspection reports duly signed by the chief engineer can be shared on request.

Achievement RA Power Solutions in Successful Repair of the Crankshaft of MAN 6L 16/24 Auxiliary Engine

The most important aspect of the repair of the MAN 6L 16/24 auxiliary engine is that it has a small diameter of 130 mm and a bearing width of only 56 mm.

The crankshaft companies based in Europe and other countries do not have crankshaft grinding equipment which can sit on the crankpin having a bearing width as low as 56 mm. Hence, they reject the crankshaft on one excuse or another or suggest removing the crankshaft from the engine and sending it to the workshop for repairs.

RA Power Solutions is the only company that has the equipment available to work on the crankpin bearing width or main journal bearing width which is as low as 40 mm.

This technologically advanced latest generation of crankshaft grinding equipment is only available with us and have successfully repaired thousands of crankshaft all over the world in countries like Greece, Moldova, Belarus Australia, Austria, Belgium, Brazil, Cambodia, Colombia, Denmark, Ethiopia, Ghana, Haiti, etc.

For more information regarding MAN engine crankshaft repair, please email us at rajshahani@rapowersolutions.com, or info@rapowersolutions.com, or call us at +91 9582647131 or +91 9810012383.

The post MAN 6L 16/24 Crankshaft Grinding On Site | Successful MAN Engine Crankshaft Repair appeared first on Crankshaft Grinding Repair.

Crankshaft Repair of MAN Diesel Engine having Small Diameter

crankshaft — Thu, 02 Mar 2023 04:31:48 +0000

RA Power Solutions Pvt. Ltd. was approached by ship managers based in Dubai advising about the failure of the crankshaft of MAN B&W Diesel Engine Model CME 5L16/24. RA Power Solutions technicians in a short time boarded the vessel crankshaft repair and inspected the crankshaft of MAN B&W Diesel Engine Model CME 5L16/24.

Following are the main observations of MAN Diesel Engine

S. NO	Crankshaft Details
1.	Engine Make	MAN B&W Diesel Engine
2.	Engine Model	CME 5L16/24
3.	Crankpin Diameter Standard	130.00 mm
4.	Crankpin Bearing Width	56 mm
5.	Name of Vessel	MV LIALA

The crank pin of the engine has a diameter of 130 mm with a bearing width of 56 mm.
All the crank pins had scoring marks and bearing line marks due to the seizure of the crankpin bearing.
The dimensional inspection was done and the crank pins had taper and ovality in the range of 0.2 mm to 0.4 mm.
The hardness was checked and was observed within the limits.
MPI check was done and few hairline cracks were observed.
The deflection and runout were observed within the limit.

Action taken by RA Power Solutions

The grinding of crank pins was undertaken and all the crank pins diameter was maintained within 0.4 mm.
Crankpin No.3 had deep bearing line marks due to the seizure of the crankpin bearing. The grinding of the crank pin to 0.6 mm was done which is the last size recommended by the engine manufacturer.
As per the manufacturers since the damage to the crankpin was more than the last limits specified Crankshaft stands rejected and the purchase of a new crankshaft was recommended.
To save the crankshaft from rejection, RA Power Solutions decided to continue the grinding of the crank pin to the undersize of 1.0 mm under deviation
The under-size bearing was supplied through one of our associate manufacturers of bearings. The engine was put into operation and has been performing satisfactorily for the last more than nine months.

Expertise available with RA Power Solutions to save the crankshaft from rejection

Having on hand experience of more than forty years, RA Power Solutions has repaired thousands of crankshafts of marine engines and engines installed in power plants which were rejected by the engine manufacturer for the following reasons.

The damage to the crankpin or main journal was more than the last limit specified by the engine manufacturer.
Presence of cracks in the crank pin and main journal.
Observation of higher hardness due to the seizure of bearing.
Observation of higher runout and deflection.
RA Power Solutions as the name suggests has the well-tried and tested solution, technology, and equipment available to repair the diesel crankshaft having the above defects.

Don’t reject the crankshaft, reduce the cost of maintenance, and contact RA Power Solutions for a successful repair. Use our technology, equipment, and experienced technicians to save your crankshaft from rejection.

Diesel engine crankshaft repair by RA Power Solutions is a testament to precision and expertise in the field. Whether it’s addressing crankshaft damage due to wear and tear or unforeseen failures, RA Power Solutions is the go-to partner for comprehensive and efficient diesel engine crankshaft repair, guaranteeing minimal downtime and maximum performance.

Our technicians are qualified and possess the necessary certifications for sailing, allowing for the overhauling and repair of diesel engine services and the replacement of crankshafts and other components while the vessel is still at sea. This approach reduces the cost associated with docking or holding the vessel at port for engine repairs.

For more information, about MAN Diesel Engine, and diesel engine crankshaft repair, please email us at rajshahani@rapowersolutions.com, or info@rapowersolutions.com, or call us at +91 9582647131 or +91 9810012383.

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