Austin (Rover) Mini (1972 - 2001) - 91 1.3 Big End Bearings (crank)

Honest John Back Room » Technical matters
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Wed 26 Aug 2009 13:56
91 1.3 Big End Bearings (crank) - jbenchi
My mate broken engine on his Mini. He made head cylinder reboring already, but he needs to do still crankshaft reboring (fine grinding) or something like first or second grinding (reboring) so I need to know all sizes or witch Big Ends (crankshaft bearings) I can use after grinding crank or how much we can grind (reboring) crank.

Rover Group MINI Cooper
first reg.: 11/04/1991
engine code: 12A2A (G)
engine type : 1275 cc / 46kW
chassis : SAXXNNAMMBD016018
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Thu 27 Aug 2009 11:17
91 1.3 Big End Bearings (crank) - Robin the Technician
From Standard, crankshafts are ground at 10 thou intervals to a MAXIMUM of 40 thou dependent on how worn the crankshaft is. After the first initial regind of 10 thou undersize recheck crank to see if all marks/ grooves etc have been removed. If not then proceed to 20 thou undersize etc.
This is a job for a professional crankshaft regrinder - not something you can do yourself.

Hope this helps

Robin the Technician
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