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 - TDC mark

When standing IN FRONT of the car looking at the engine, is TDC the far left or far right pointer on the timing cover?
Chris

Chris. What engine do you have? The early engines have the timing marks located on the bottom of the timing chain cover. When viewed from the front, the TDC pointer is on the left. The later cars, starting with the 18V engines, used timing marks which were visible from the top side of the engine. The upper most pointer represents TDC on those engines.

Look at the rotation of the engine. The harmonic balancer rotates in a clockwise manner when viewed while standing in front of the engine. Thus, TDC will be the last pointer in the group, in reference to the moving balancer--the last one it passes on each revolution, and each other pointer will represent degrees Before Top Dead Center for use when timing the engine using a dynamic timing light.

Les
Les Bengtson

Chris to answer along the lines of your question, Les is saying that it is the far right pointer if you have a 18V engine and the far left pointer is 20 degrees before TDC What model car do you have ?

-James
James

Thanks for the info. It is an 18v.
Chris

Chris. The upper most pointer indicates TDC.

Les
Les Bengtson

It is the last pointer the groove on the pulley passes on all engines, and all MGB engines have the crank pulley rotating clockwise as you look at that end of the crank. The TDC mark should be slightly bigger than all the others, with the 10 degree marks being smaller and the 5 degree smaller still.
Paul Hunt

Clean the plate and paint the lines...makes its easier to see and check...
Pete

This thread was discussed between 27/05/2009 and 29/05/2009

MG MGB Technical index

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