Spent 2 days largely on drilling out and re-tapping sheared off studs on the boiler of 0-8-0 Q6 63395 at Grosmont, NYMR.

Is the camshaft new or is it an old one? If old, uneven wear could lead to incorrect valve timing, as could badly worn cam followers.

The last time I saw Chris before he died was when he came round here to talk about brake lining material because "he had run out of adjustment". I revealed to him the mysteries of the fulcrum brake adjuster and when he left I assumed he would make use of them. Clearly, he didn't - but you ...

What that piston is - goodness alone knows.

I have sent you a PM.

Gui, I have spent a fair part of today pondering why your Square is a) less than smooth at higher revs and b) reluctant to go much above 60mph. If the valve timing is correct, then the problem has to be what I call a silly one. In the case of my 4G it was the tappet adjusters catching on the rocker ...

Well, apart from the inner flat bit of the front brake dust cover rim being shiny instead of painted black......

Rant over.

Perhaps you could get that type of damage by knocking the case off the bench?

I think I would be considering replacement cases - which should not be too difficult to source.

My 1937 RH500 has the small bore original pump, an oil control ring on the piston, and I have fitted the later head so use the oil feed from the pressure side to the rockers. There are a number of AOMCC members who will confirm that, from time to time, the bike gets thrashed. It seems to thrive on t...

TJ,

My guess is that your studs are pulling where they go in to the head or cylinder. Its probably a long standing problem, rather than something you have caused. I can only suggest removing the studs to see if I am correct.

Gui,

Check your valve timing. The bike should go much better than that.

You have, no doubt, tightened the nuts by now but I thought it worth saying (and having it recorded because its on this Forum) that the cranks on pre-war Squares are so incredibly hard, on the surface at least, as to be brittle. Post war 4G cranks are much softer on the surface and less brittle as a...