Main bearing advice

[Robbie.watson@uk.bp.com]

Hi all
Starting to rebuild my new engine and need to purchase new main bearings.. Trouble is I'm not sure which ones I need for the front. The crankcase number is 186772, should I be getting the AC full width or the AC narrow set? Looking at the details on our cherished suppliers sites the cutover seems to be 1934 which I think is about the age of my crankcase....

Any advice very gratefully received

Cheers
Robbie

[Tony Press]

Hi all
Starting to rebuild my new engine and need to purchase new main bearings.. Trouble is I'm not sure which ones I need for the front. The crankcase number is 186772, should I be getting the AC full width or the AC narrow set? Looking at the details on our cherished suppliers sites the cutover seems to be 1934 which I think is about the age of my crankcase....

Any advice very gratefully received

Cheers
Robbie

For a while the narrow bearings were fitted in the old housings with two 30 thou spacing washers front and back.

Measure the housing depth- the pair of standard 'wide' bearing are 1 5/8" the pair of  'narrow' outer ring bearings are 1 9/16" (approx 60 thou less).

Cheers, Tony.
'

[Robbie.watson@uk.bp.com]

For a while the narrow bearings were fitted in the old housings with two 30 thou spacing washers front and back.

Measure the housing depth- the pair of standard 'wide' bearing are 1 5/8" the pair of  'narrow' outer ring bearings are 1 9/16" (approx 60 thou less).

Cheers, Tony.
'
Thanks Tony, just what I need. I'll measure tomorrow and then order