How to check timing on a /6 with engine in car. Options

[tornik550]

How do I check timing with a timing light on a /6. I know how to set the static timing however I want to check with a light. I have seen that some cut an acess panel in the firewall. I don't want to do that at this point. There isn't enough room to fit a timing light.

[fixer34]

AFAIK, and how I've done it, there is an access hole on the top of the case above the flywheel. There are TDC and full advance marks on said flywheel. The hole is large enough to get a finger in there to scrape/sand away rust and put paint on the marks.

The daunting part is that you set the running timing for full advance at 6000 rpm, leaning over the carb stacks. One hand on a timing light, and one to adjust/turn the distributor. Helps to have someone in the cockpit holding the throttle at 6000 also.

[larryM]

AFAIK, and how I've done it, there is an access hole on the top of the case above the flywheel. There are TDC and full advance marks on said flywheel. The hole is large enough to get a finger in there to scrape/sand away rust and put paint on the marks.

The daunting part is that you set the running timing for full advance at 6000 rpm, leaning over the carb stacks. One hand on a timing light, and one to adjust/turn the distributor. Helps to have someone in the cockpit holding the throttle at 6000 also.

X2

- that's all correct so long as you still have an oem 914/6 flywheel

aftermarket and replacement 911 flywheels have the timing marks in the "wrong" place for the 914/6 viewing slot

if you have a good "advance type ' timing light you set it to ZERO and dial up the advance reading when it turns 6000

you can also do this with a mirror watching the pulley marks (which you have brightly marked) by using a dial-advance type tool

even better - cut a porthole in the firewall like our GT's have, and just do it thru the front - see picture







.