cam timing without taking head off...
Turbo Mini Forums

right, I'm about to fit new duplex timing gears to my engine, to replace the belt drive kit which seems to never stop leaking (yes tried all the usual tricks).
If poss I want to do this WITHOUT taking the head off...
I know the cam in it at the mo is accuratly set up to 106deg.

once the new timing gears are fitted I obviously need to set the timing again. I can use the DTI off the valve and use the dwell to get what SHOULD be TDC, but what method do others use to get true TDC in this set up (i.e. with head still on...)

thanks!

Pedro Silva

http://miniciados.blogspot.pt/

using the DTI in the spark plug port isnt very accurate unless the DTI screws into the plug hole - which mine doesnt...

Is there timing marks on the flywheel you can use for tdc?

None on the flywheel as its an ultralight...

Headgasket isn't very expensive and timing is pretty important
I'd take the head off

Edited by WRLondon on 30th Jun, 2013.

Reading up on RTS Clutches

Just use a finger type Dti In the plug hole, it should reach fine.

https://www.facebook.com/pages/Fusion-Fabri..._homepage_panel

www.fusionfabs.co.uk



1/4mile in 13.2sec @ 111 terminal on 15psi

OR adapt with a bit of welding rod, coat hanger etc etc.

There is absolutely no need to take the head off.

9.85 @ 145mph
202mph standing mile
speed didn't kill me, but taxation probably will

Pull the head of

Own the day

One of the ways it can be done on indirect diesels (pre chamber in the way of the injector holes) is to pull off a valve spring and rest the valve on top of the piston, then put the DTI on the valve. For me this would be a last resort, but if you do make sure you don't turn the crank very far, and make sure those collets go back properly.

I take it none of the people who said "pull the head'' are using a gp a gasket!

use the dead stop method to find true tdc and mount the protractor in the right place.

you do need a very sturdy dead stop ( (if the plug is angled) that reaches deep enough to touch somewhere near the centre of the piston otherwise the rock of the piston gives grief.

I made one by knocking the centre part of a spark plug out and fitting a bolt trough it, which I then ground round afterward.

I works but I still don't like it

Edited by Sir Yun on 1st Jul, 2013.

That sir, is not rust, it is the progressive mass reduction system

http://aseriesmodifications.wordpress.com/