MG-Cars.info

Welcome to our Site for MG, Triumph and Austin-Healey 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 MGB Technical - 3# cylinder proplems

Does the #3 cylinder have a history problem 1970 mgb, I have antifreeze filling the cylinder non on the dip stick. Looking at replacing the head gasket
Dm Matias

Usually it's just simply an age thing, where the gasket has gradually rotted away, BUT there is always the chance you have a cracked cyl.head
If it's simply a gasket you should be able to see the causal section when you get the head off.
It will have to come off anyway, but get it checked/crack tested if the gasket looks ok and a light skim to restore the surface
Cheers
willy
William Revit

Pull the the head and have it Magnafluxed. This will tell you what condition the head is in.

Cheers

Gary
79 MGB
gary hansen

How much should one expect to pay to have a B series Head magnafluxed ...?
Thomas Koch

Between $30 and $50. RAY
rjm RAY

If you pull the head for inspection make sure that all the stud holes along the spark plug side of the head are thoroughly cleaned. A common problem in the area of cylinders 2 and 3 is that the head gasket leaks at the stud hole and fills up the stud hole with rust which, after expanding, cracks the head in or around that location.
Richard Smith

Don't know what model your block is but if it is an 18GD they are prone to cracking at the top rear of No4 bore - I replace 3 when I had my business. If it filling No3 cyl then probably the gasket. Always put anti-sieze on studs & washers before tightening & run till hot & re-torque but slacken each nut in turn a 1/4 turn first.
Garth
J G Bagnall

This thread was discussed between 11/06/2016 and 28/06/2016

MG MGB Technical index

This thread is from the archives. Join the live MG MGB Technical BBS now