Machining connecting rod big ends.

[temana]

We have recently opened up a MAN B&W main engine to find the connecting rod big ends are excessively oval.

Does anyone have any experience with machining connecting rods (dia of bearing approx 300mm).

 

[Nazeer]

Yes , I have experience in machining of Con Rod big end bearings. That was for a Daihatsu Genset. The Engine manual usually tells the limit of the ovality beyond which machining is required. It is advisable to get advise from the Engine manufacturer in this regard and also about the limits for machining and availability of oversize bearings if any.
Nazeer

 

[AndyA]

Nazeer is correct, the engine manual will have the limits for machining and should also give part numbers for the oversized brgs that correspond to new size of big end.If not get in touch with B&W and get an up to date manual for it. B&W are notorious for revising part numbers , altering designs and putting new specification limits on their product parts.

 

[AndyA]

Have a look in their web site

http://www.manbw.dk/

They have a tech support FREE for help on marine diesels by calling :Contacts at MAN B&W Diesel service in Copenhagen:
During office hours:
Phone: + 45 3385 1100
Fax: + 45 3385 1049
E-mail: diesel-service@manbw.dk
Emergency - after office hours:
Mobile phones + 45 2120 7551 or +45 2120 7552

Just supply them with your details :Technical info:

Engine type and builder
As detailed a description of the difficulties or symptoms as possible
Vessel data:
Name and Lloyd´s no.
Ship's agent and schedule

Hope this is of help to you Andy