MG-Cars.net

Welcome to our resource for MG Car Information.

Recommendations

Parts

MG parts spares and accessories are available for MG T Series (TA, MG TB, MG TC, MG TD, MG TF), Magnette, MGA, Twin cam, MGB, MGBGT, MGC, MGC GT, MG Midget, Sprite and other MG models from British car spares company LBCarCo.

MG MGA - Spigot bush

Anyone know the tolerances on the bush ID and shaft OD?
Art Pearse

Yup. Spigot bushing dimensions are same as for rocker shaft and rocker arm bushings. Nominal diameter is 5/8-inch (0.6250"). The shaft is 0.002" smaller at 0.6230". The bearing ID should be nominal size at 0.6250" (when new after installation). The 0.002" difference gives 0.001" radial clearance for oil film (similar to crankshaft bearings).
Barney Gaylord

For the price and ease to change - I would change whenever you have the engine out after say 30,000 miles service. Barney would have better experience but mine was quite sloppy after this service.
Regards
Mike
Mike Ellsmore

Shaft is .6216, bush .6279. Guess I need a bush. But what about the shaft? I was hoping not to have to mess with the gearbox. Maybe I can get a custom bush turned up.
Art Pearse

Old bush came out neatly with the grease technique.
Art Pearse

If the shaft is smooth the size is not a problem, as the bushing can wear several thou and still be serviceable.

Yes, change the spigot bushing every time the engine is out for clutch service. The bush is a cheap part, very easy to change, and such a PITA problem if you leave the old on in and it groans after reassembly.
Barney Gaylord

This thread was discussed on 15/08/2009

MG MGA index

This thread is from the archive. The Live MG MGA BBS is active now.