Insitu Crankshaft Grinding Archives

Compressor Crankshaft Grinding and Polishing Onsite

RA Power Solutions was approached by a leading Fertilizer producing company based in north India regarding the requirement of onsite grinding and polishing of compressor crankshaft.

The company has five high-capacity CO2 compressors which have been imported from a leading company based in Europe.

Our team consisting of three technicians along with onsite crankshaft grinding equipment was deputed to the site and following was observed:

Details of CO2 Compressor Crankshaft:

S. NO	Crankshaft Details
1	Engine Make/ Model	CO2 COMPRESSOR
2	Crankpin Diameter Standard	317.30 MM
3	Crankpin Bearing Width	210.00 MM
4	Main Journal diameter	330 mm & 317.30 mm
5	Main Journal Width	370 mm & 225 mm
6	Place of execution of crankshaft repair	Fertilizers & Chemicals Plant in India

On dimensional inspection of crankpin it was observed that crankpin nos. 02 developed excessive ovality. It also had deep line marks due to the failure of bearings which are of babbitt white metal type.
All the remaining crankpins were inspected and rough surfaces including bearing line marks were observed.
The main journal having a standard diameter of 330 mm also had a rough surface and required polishing.

**Damage of crankpin no. 6 of Compressor**

**Onsite repair of damaged crankshaft of CO2 Compressor**

**Picture showing before polishing of Main Journal**

Action taken by RA Power Solutions

Considering the fact that the main journal having a diameter of 330 mm having a rough surface and bearing line marks it was decided to remove the crankshaft from the compressor.

RA Power Solutions technicians submitted a drawing of V-Block which were manufactured in the factory for placement of crankshaft.

The grinding of crankpin no. 02 was undertaken and the final dimensions were maintained between 315.58 mm to 315.60 mm. The ovality of only 0.02 mm was observed.

All the remaining 05 crankpins were polished, removing the line marks and improving the surface finish. The surface finish after polishing was observed at less than 15 RA value.

All the main journals were also polished onsite removing the ovality to some extent and improving the surface finish again to less than 15 RA value.

**Crack detection test of compressor crankshaft before grinding**

**CO2 Compressor Crankshaft Inspection and Repair on site**

Advantage of getting the crankshaft grinding/ Polishing done by RA Power Solutions

RA Power Solutions is the only company in India having experience of forty-three years in crankshaft repair.
We have ready availability of equipment up to 700 mm diameter. The equipment is portable and lightweight and can be taken to any site all over the world as accompanied baggage. The modification in the onsite crankshaft grinding and polishing equipment is possible as per the site requirement.
In this case since the main journal diameter was to be polished the V-Block was designed and fabricated onsite.
RA Power Solutions as a protocol undertakes all the checks prior to grinding and polishing like cracks by MPI, Hardness test, deflection, etc.
We also manufacture babbitt white metal bearings and do rebabbitting of old bearing up to 1500 mm diameter.

**After Grinding and polishing taken deflection of CO2 Compressor Crankshaft**

**Main Journal of CO2 compressor after polishing**

For more information on crankshaft grinding services, insitu crankshaft grinding and polishing, onsite crankshaft repair, or crankshaft polishing services email us at rajshahani@rapowersolutions.com, info@rapowersolutions.com Call at +91 9582647131,+91 9810012383.

Daihatsu 6 DK-20 Crankshaft Repair | Onsite Grinding of Daihatsu Engine Crankshaft | Crankshaft Machining In Situ

RA Power Solutions was approached by a company based in Greece regarding a problem faced by them in their auxiliary engine of Daihatsu 6 DK-20.

It was reported that the bearing of crankpin no.3 got damaged.

THE ENGINE DETAILS OF DAIHATSU 6 DK-20 ENGINE ARE AS FOLLOWS:-

S. NO	Crankshaft Details
1	Engine Make	Daihatsu
2	Engine Model	6 DK-20
3	Crankpin Diameter Standard	170 mm
4	Crankpin Bearing Width	78 mm
5	Name of Vessel	MV ABBA

ACTION TAKEN BY RA POWER SOLUTIONS TO REPAIR THE CRANKSHAFT OF DAIHATSU 6 DK-20:-

Technicians on boarding the vessel inspected the crankshaft.
The hardness of crankpin no.3 was observed within limits between 210 to 240 HB scale.
After a thorough cleaning of crankpin No. 3, the MPI test was done and no cracks or abnormality was observed.
Crankpin no. 3 was subject to dimensional inspection.

FOLLOWING ARE THE MAIN OBSERVATIONS:-

a) Minimum diameter observed – 169.10 mm

b) Maximum diameter observed – 169.33 mm

c) Total ovality -0.40 mm

The crankshaft was already undersized to 169.50 mm against the standard size of 170.00 mm.

ACTION TAKEN BY RA POWER SOLUTIONS FOR REPAIR OF CRANKSHAFT OF DAIHATSU 6 DK-20:-

The onsite crankshaft grinding machine was set up and grinding of crankpin no.3 was undertaken by reducing the diameter by 1 mm.

a) The minimum diameter observed after grinding – 168.98 mm

b) Maximum diameter observed after grinding – 169.00 mm

c)Total ovality observed after grinding – 0.02 mm

After grinding crankpin no. 3, the engine was assembled and put on trial.
We will be pleased to share the original pre and final machining inspection reports duly signed by the chief engineer of the vessel which has all the technical details required for the successful repair of the crankshaft.

REPAIR OF CRANKSHAFT OF DAIHATSU 6 DK-20 HAVING CRANKPIN BEARING WIDTH OF ONLY 78 MM:-

It was possible for RA Power Solutions to successfully undertake repair of the crankpin having a bearing width of only 78 mm because we have the equipment which can be placed on the crankpin or main journal diameter having a bearing width of as small as 40 mm.

With this advanced technology and process, no other crankshaft repair company has due to which they either reject the crankshaft or recommend getting it repaired from the workshop.

**Crankpin of Daihatsu 6 DK-20 Engine Crankshaft before Repair**

**Magnetic Particle Test of Crankshaft of Daihatsu 6 DK-20 Engine**

**Repair of Crankshaft of Daihatsu 6 DK-20**

**Crankshaft Grinding of Daihatsu 6 DK-20**

We have been regularly executing the repairs in Greece, Moldova, Belarus, Australia, Austria, Belgium, Brazil, Cambodia, Colombia, Denmark, Ethiopia, Ghana, Haiti, etc.

This blog is written by Mr. Raj Shahani (Managing Director of RA Power Solutions India Pvt. Ltd.) and a highly experienced business leader with rich experience of more than 40 years in the field of Power, Heavy, and Shipping industry. He is Technical Adviser to many shipping and heavy industries across the globe.

Mr. Shahani is one of the most enthusiastic professionals and he has all the brilliance of an exemplary leader. He is an extremely effective coach and mentor of teams and is adept at providing leadership in a global, cross-cultural environment.

For more information on bearings for Daihatsu engine and Daihatsu crankshaft repair contact us at rajshahani@rapowersolutions.com or info@rapowersolutions.com or call us at +91 9582647131 or +91 9810012383.

Onsite Crankshaft Grinding Machine | Insitu Crankshaft Polishing and Grinding Machine | Crankshaft Machining – RA Power Solutions

In case of accident of Crankshaft in recent past, it was necessary to disassemble the crankshaft from the engine block or housing, pack it and send it to the designated workshop.

The Introduction of Onsite Crankshaft Grinding Machine, Insitu Crankshaft Polishing and Grinding Machine, and Crankshaft Machining, there is no need of removing the Crankshaft and sending it to the work shop as now it is possible to undertake crankshaft grinding and crankshaft repair with revolutionary design of Onsite Crankshaft Grinding Machines manufactured by RA Power solutions.

The Onsite Crankshaft Grinding Machine has been developed out of our experience of Crankshaft repair of Forty Years. The Machine is Lightweight and can be taken to the Site. It has the following Features.

Onsite Crankshaft Grinding Machine, Insitu Crankshaft Polishing, and Grinding Machine is manufactured by RAP after extensive research, development, and our experience.
The Machine in the Initial Years was used by our technicians for In-house applications. Now from last ten years Machine is sold in open market all over the world.
The Insitu Crankshaft Grinding and Polishing Machine is user-friendly and can be operated by any person having basic machining knowledge.
The Machine is capable and is designed to maintain the close dimensions and Geometrical tolerances as per the manufacturers requirement.
Presently Onsite Crankshaft Grinding Machine is manufactured for the diameter of the Crank-pin and Main Journal of the Crankshaft ranging from 30 mm to 700 mm.
Crankshaft Grinding Machine is manufactured out of Titanium Alloy which is lightweight and can be easily carried to the Site.
The Machine is capable of working on a Vessel while it is moving.
Training forms an integral part of the Crankshaft Grinding Machine. Training onsite is provided.
We have sold more than seventy machines all over the world and are priced cheapest in the International Market.

Onsite Crankshaft Grinding Machine Ready for Dispatch

Onsite Grinding Machine for Small Diameter

For more details on insitu crankshaft grinding equipment, portable crankshaft grinding machine or onsite crankshaft grinding and polishing please email us at rajshahani@rapowersolutions.com, or info@rapowersolutions.com, or call us at +91 9582647131 or +91 9810012383.