TDC - is there an easy way to find it?

[Toastfrenzy]

How do I find TDC of a piston?

Is there an easy way?

 

[bloke]

I still use the tried and tested big long screwdriver method.

 

[Bobby.]

Screw driver down the spark plug hole is the easiest way as the bloke said or you could time it up with the pin in the crank (making sure you don't put it in the balancing hole)

why do you ask anyway?

 

[Toastfrenzy]

Screw driver down the spark plug hole is the easiest way as the bloke said or you could time it up with the pin in the crank (making sure you don't put it in the balancing hole)

why do you ask anyway?

Just bought a leak down test kit, last update on my project thread. Thought I'd see if the melted spark plugs had caused any damage - when I saw how easy it is to do the test and the kit was only £46. Thought I'd give it a go.

But was unsure how to find TDC - just seen a vid where you can connect a vac\psi gauge into the plug hole, rotate crank, needle reading psi - in compression. As soon as it registers vacuum - go back a bit and with needle on zero that's TDC.

Haven't got a vac gauge so will use a GS and the trusty ole mk1 EB.

 

[Dan@SJM]

Screwdriver method is better.

 

[mark123]

Just bought a leak down test kit, last update on my project thread. Thought I'd see if the melted spark plugs had caused any damage - when I saw how easy it is to do the test and the kit was only £46. Thought I'd give it a go.

But was unsure how to find TDC - just seen a vid where you can connect a vac\psi gauge into the plug hole, rotate crank, needle reading psi - in compression. As soon as it registers vacuum - go back a bit and with needle on zero that's TDC.

Haven't got a vac gauge so will use a GS and the trusty ole mk1 EB.

There is a mark on the fly wheel you can see it through the gearbox casing - just below the thermostat housing. On a std car it is difficult to see due to loom/air box.

 

[Toastfrenzy]

There is a mark on the fly wheel you can see it through the gearbox casing - just below the thermostat housing. On a std car it is difficult to see due to loom/air box.

Ah, have seen\can see the gap, where does the mark need to be?

 

[mark123]

There is a corresponding mark on the gearbox to line it up to. Assuming you have a std flywheel?

I'll see if I can find a pic...

 

[Toastfrenzy]

There is a corresponding mark on the gearbox to line it up to. Assuming you have a std flywheel?

I'll see if I can find a pic...

yes std fly wheel, would this work for all 4 pistons? Having a job working that out in my head. lol.

 

[mark123]

Would only work for 1 and 4. You could find it for 2 and 3 using the screwdriver method and make your own mark.