Board logo

Engine Bearings
nib1980 - 6/6/08 at 04:24 PM

Hi all,

I'm in the process of rebuilding a 1600 xflow.

I've just tried to find some bearings for the main, big end and the thrust washers.

I took the current ones out, and the thrust is stamped STD as expected.

but the main and big end are marked 0.010 U/S

does this mean tehy are undersize? if so where the heck do i get these from, I've only ever heard of STD and O/S.

Many thanks

Nib

r1_pete - 6/6/08 at 04:37 PM

Some manufacturers stamped undersize, it means the same, the crank is ground smaller, hence undersize of original.

Paul TigerB6 - 6/6/08 at 05:13 PM

As above, any scoring on the crank will require it to be ground down and so smaller (undersize) bearings are needed. If any more machining is needed you will have to fit further oversized bearings, ie, 0.015 or 0.020 etc - whatever is available and grinding down sufficiently to remove any damage

rusty nuts - 6/6/08 at 05:27 PM

Just be aware that it could have oversize outside diameter mains as well as underside inside diameter. Fords apperantly managed to salvage some less than accurate blocks by line boring the main bearings oversize. Probably best if you take the crank and a bearings to your local engine machine shop , they should know whats what.

nib1980 - 6/6/08 at 05:55 PM

Many thanks all.

I just been out and measured the journals, and looking on the burton power site, I can see that they are 0.010 O/S

interesting the Bearings are over size bu not the thrust washer

paulf - 6/6/08 at 08:35 PM

The thrust faces on the crank rarely wear so dont normally need oversize thrust washers.When i worked for a company that rebuilt engines we would just clean up the thrust face if it showed signs of wear and then get thicker thrust washers and ease the faces down on wet and dry until they fitted with the correct end float.
Paul

quote:
Originally posted by nib1980
Many thanks all.

I just been out and measured the journals, and looking on the burton power site, I can see that they are 0.010 O/S

interesting the Bearings are over size bu not the thrust washer

nib1980 - 6/6/08 at 08:56 PM

That makes sense then. many thanks Paul


quote:
Originally posted by paulf
The thrust faces on the crank rarely wear so dont normally need oversize thrust washers.When i worked for a company that rebuilt engines we would just clean up the thrust face if it showed signs of wear and then get thicker thrust washers and ease the faces down on wet and dry until they fitted with the correct end float.
Paul
quote:
Originally posted by nib1980
Many thanks all.

I just been out and measured the journals, and looking on the burton power site, I can see that they are 0.010 O/S

interesting the Bearings are over size bu not the thrust washer