Wartsila 4L20 crankpin grinding Archives

The Wartsila 4L20 crankshaft was repaired by RA Power Solutions technicians on board a vessel while sailing. The vessel is owned by a reputed shipping company based in kuwait. Due to the serious accident the crankshaft was removed from the engine block as the crankcase of Wartsila 4L20 was also badly damaged beyond repair.

The main dimensions of the crankshaft of Wartsila 4L20 are as follows:

S. NO	Crankshaft Details
1.	Engine Make	Wartsila
2.	Engine Model	4L20
3.	Crank pin Diameter Standard	180 mm
4.	Crankpin Bearing Width	71 mm
5.	Main journal diameter	210 mm
6.	Place of execution of crankshaft repair	Sailing from Paradip Port to Ennore Port India

Action taken by RA Power Solutions technicians to repair the Wartsila 4L20 Crankshaft

On arrival our technicians observed that the damaged crankshaft was lying on the floor. A design of v block was made and V block was manufactured on the vessel. This was done to do the inspection & grinding of the crankshaft as it was aleady removed from the engine block.

RA Power has a tooling by which crankpin grinding can be done without removing the crankshaft from the block

All four crankpins were inspected. The maximum ovality of 0.17 mm was observed.

Inspection report is pasted below:

Uneven surface, bearings line marks and pitting marks were observed on all crankpins.
All main journals were also dimensionally checked and were observed to be within limits. The standard diameter of the main journal is 210 mm.
As a matter of routine hardness test, crack detection test, surface finish test etc was done and observed within limits.
The grinding of damaged crankpins was done and all the crankpin were undersized by 0.50 mm only. The final size of the crankpin was maintained between 179.48 to 179.50 mm.

**Wartsila 4L20 crankshaft grinding on V-BLOCK**

**Crack detection test of Wartsila 4L20 Crankshaft before grinding**

The final diameter maintained after grinding of crankpins is pasted below:

**Crankpin Polishing after inspection of crankshaft**

The above job was done while sailing of the vessel from Paradip port to Ennore port India and there was no need of stopping the vessel.

We have been regularly executing the repairs in Madagascar, Oman, Qatar, Philippines, Bahrain, Srilanka, Bangladesh, Myanmar, Turkey, Nigeria, Greece, Saudi Arabia, UK, Dubai, Malta, Cyprus, Singapore, Malaysia, Colombia, Indonesia, Hong Kong, Spain, Netherlands, Dubai, Portugal, Estonia, Morocco, Belgium, Vietnam, Canada, Jordan, Libya, Kuwait, Egypt, Morocco, Yemen, Bahrain, Tunisia, Sudan, Oman, Algeria, UAE, Iraq.

**Wartsila 4L20 Engine Crank pin after Grinding**

**Wartsila 4L20 crankpin after grinding & polishing**

For more informationon Wartsila 4L20 Crankshaft Repair, contact us on rajshahani@rapowersolutions.com, info@rapowersolutions.com, or call us at +91 9582647131 or +91 9810012383.

RA Power Solutions was approached by a leading Cement manufacturing Plant based in Nepal regarding the failure of their Crankshaft of Wartsila Diesel Generator model no. WARTSILA VASA 12V32 LN.

The Cement Plant in Nepal is having multiple numbers of Wartsila diesel generating sets model VASA 12V32 LN, Wartsila 18 V 32, and Wartsila 12 V32. The one number crankpin got damaged due to seizure of the bearing of Wartsila Diesel generating set Vasa 12 V32 LN.

Wartsila Diesel Generator Crankshaft main Observations:

On inspection of all the crankpins visually the Bearing of crankpin no. 3 was observed damaged and bearing material was found in the oil sump.
On removal of connecting Rods from crank pin no 3. A & B bank, it was found that the bearing was badly struck to the crankpin diameter and it was a case of bearing failure.
The Bearing was removed from the crankpin and on visual inspection, it was observed that bearing material was embedded on the crankpin. The radius fillet of both sides of the crankpin was found damaged and the profile of the radius fillet was distorted.
After cleaning and little polishing of crankpin to remove the bearing material the crack detection test by MPI method was undertaken. No crack was observed.
The hardness was also checked and it was observed in the range of 600 HB in a scattered formation which is considered to be on the higher side.
The crankpin was subject to dimensional inspection and the following dimensions were observed.
- Minimum diameter observed- 269.02 mm
- Maximum diameter observed- 270.00 mm

Against the standard diameter of 270 mm, the ovality of 0.98 mm was observed which is considered to be very much on a higher side.

**Installation of onsite crankshaft Grinding machine on Wartsila Crankpin**

Surface finish test crankpin of Wartsila 12V32 LN Crankshaft — **Installation of onsite crankshaft Grinding machine on Wartsila Crankpin**

Achievement by RA Power Solutions in successful Repair of Wartsila Crankshaft 12V32 LN:

The successful repair of damaged crank pin no. 3 of Wartsila Crankshaft 12V32 in a short time of 79 hrs is an achievement, the grinding of crankpin was undertaken nonstop on 24 hours basis by a team of three technicians of RA Power Solutions.

RA Power technicians have undertaken the grinding of crankpin having a standard diameter of 270 mm. Due to serious damage of crankpin, it is to be undersized by 2.0 mm.

The Wartsila Diesel Generator set has been assembled and is in operation.

We have been regularly undertaking crankshaft repair of Wartsila Diesel engine Model No. 12V32, Wartsila 46, Wartsila 43, Wartsila 12V26, Wartsila 12V20 and can undertake grinding of crankshafts up to 700 mm diameter.

**Grinding of Wartsila 12V32 LN Crankpin**

**Crankpin of Wartsila 12V32 LN Crankshaft after grinding & polishing**

For more details of the crank pin grinding machine, wartsila crankshaft repair, and wartsila diesel generator crankshaft email us on info@rapowersolutions.com, rajshahani@rapowersolutions.com, call at +91 9582647131,+91 9810012383.

Category: Wartsila 4L20 crankpin grinding

Wartsila 4L20 Crankshaft Repair on Board a Vessel