Changing a camshaft with engine in the car ?

[chap]

Hello from Paris

I deal actually with some questions about the camshaft. Is it possible to change this part with the engine still in the car ?
How do we do this ? Is there a tutorial for that ?
What difficulties can we foresee ?

Subsidiary question : Is it possible to change headgasket with the engine in the car? How much does a head weights ? Is it honnestly possible to lift that from the car with only two arms ?

Thanks for your answers.

[chap]

One first point! Thx
Any link for the tutorial ?

[chap]

All right. I was exspecting something more tricky. Thanks for your message.

[chap]

Sorry for my poor english. What is a doddle ?
What do you mean by degreeing the cam?
Using this kind of degree disc http://www.automotivearticles.com/uploads/degree_w... to set the Vernier wheel of the timing chain so that valves do synchronize appropriatly with the crank rotation ?
Or is it something else to do?

[chap]

Thank you pupp

Just in case, how do we proceed to make a positive stop TDC finder? Is it a single stop bar to bolt in somewhere or do we use any meter on the piston for that ?

[chap]

Pupp said:

Bar across the bore of number 1, clamped to the deck by two of the head bolts/studs, and with a single screw and locknut between protruding onto the piston crown. Adjust until the centre screw just stops the piston going full stroke and the point exactly half way (on a degree wheel on the crank) between the two 'stops' is TDC.

The same can effectively be done with the heads in situ, by adapting an old spark plug by removing the core and threading a long bolt or stud through it.

Using a dial indicator is imprecise in comparison as there is a few degrees of effective dwell at the top of the stroke and it can be difficult to see exactly where the dial starts moving due to bearing clearances etc.

THank you. This is of great help.

[chap]

Thx

A pix worths a thousand words.

Great topic with pictures and explanations. Thanks a lot to all of you