1.8 engine timing mark Options

[mcericmc]

There is only one timing mark on my 1.8 fan. It's visible through a notch on the rear side of the fan via the inspection port. Pelican parts info says the mark is TDC. Auto Atlanta says it's 7.5 degrees BTDC in the 914 tech tips 700 book. Can someone please tell me which is correct? I need to make sure the timing and valves are adjusted properly. (IMG:style_emoticons/default/WTF.gif)

[Ninja]

Just adding verification...

I too, was perplexed by the no TDC and no 27 degree mark on my 75 914 1.8L

A swap to a 2.0l balancer is how I fixed mine...

Important to make a second TDC mark 180 degrees from the original. Make it a different color (mine's blue). This will allow accurate TDC settings for leak down testing on all cylinders.

IMO it seems silly that Porsche changed the harmonic balance markings just because of L-Jet.

Jack's method will work fine.

If you want to "fine tune" the TDC marks here's an accuracy test.

Remove plugs and do a leak down test with #1 at TDC compression. If you are within 1/2 a degree of perfect adding the leak tester will NOT cause the engine to rotate.

If you are outside this range the engine will rotate 180 degrees SO FAST it's hard to see it... (IMG:style_emoticons/default/ninja.gif)
Watch which direction it turns and cheat it a tiny bit in the opposite direction until the LD tester doesn't flip it over.