Oh bugger

[Conner]

Well I have found the reason for the oil pump wear wish I had found this before buying a new Pump. Looks like open heart surgery. 

[Rough Hewn]

Oh buggered.

[Conner]

I stripped it down expecting a failed bearing. Bearings a bit rough but no play. The play is between the casing and the bearing. No damage to casing. Looks like it’s been like this since manufacture very surprised. Will try new bearings if not too dear☹️☹️

[Rough Hewn]

It shouldn’t do that.
Ever.

[Toad]

Measure the outside diameter of the bearing and the inside diameter of the casing. I suspect the casing has gone wrong, being the softer material and you need a new crankcase.

[Conner]

Just measured up the bearings and crankcase in my local bearing supplies. Both at 40mm no wear on crank case I was expecting to see it very worn with a spinning bearing. Took pics when I got back.

There is no lip on the crankcase to be felt.

[Dan Maynard]

Internal measurements like that with verniers will tend to under read, and you already have almost 0.1 difference when hole should if anything be slightly smaller than bearing. To me it looks like crankcase is shot.

[StihlGreen]

46 minutes ago, Conner said:

Just measured up the bearings and crankcase in my local bearing supplies. Both at 40mm no wear on crank case I was expecting to see it very worn with a spinning bearing. Took pics when I got back.

There is no lip on the crankcase to be felt.

If you were worried about any wear, Loctite 620 might be worth a try....probably worth checking with @spudulike for advice though....he is a very knowledgeable chap👍

[spudulike]

Thanks for the flippin Apple movie, taken me 10 mins to view it!!

I think I would try degreasing the bearing and its seat in the case and then use a smear of JB weld and let it go off with the bearing in place if the gap between bearing and case is large but if it is  relatively close, a Loctite bearing retaining compound should do it. Look for one that will fill a relatively large gap, will work at temperature and is high strength.

Don't get any of either compound in the bearing as it will kill it....perhaps stuff it with grease before inserting it to keep the compound out. Let the compound go off fully before reassembly. 

If this doesn't work then it will be new cases time and may be worth fitting a new bearing when effecting the repair as I have seen worn gudgeon pins in pistons where the alloy has survived and the steel has worn...strange but true!

[spudulike]

Loctite 620 or 638 would seem to be about right....638 has a slightly better gap filling performance at 0.25mm!