roman944

figured out how to use Arnworx tool

tensioned the belt

turned the engine over by hand

now mark on the cam gear is 1 tooth to the right of the timing mark on the camshaft housing, and the mark on flywheel is in the correct place

is this OK?

or should we redo the whole thing and try to get both marks to align perfect?

Jfrahm

How slow is OK? One tooth is too far off for proper performance.

Lemming

Fit it!

Rogue_Ant

1 tooth off = ~9°... Much too far off - fix it.

Van

Com'on Roman! Just loosen the tensioner and fix it!!

Is one tooth off OK... I tried calling you, but I must have been one number off... why didn't you answer? Porsche wouldn't have put a freakin' mark on there if they didn't care how it lined up!

roman944

so I will just loosen belt, slide it off the cam gear, turn the gear to 1 tooth before mark on the cam housing, put the belt back on and repeat the tensioning process?

no risk of damaging anything?

also, should I put the flywheel lock back on?

thanks guys

xsboost90

dont even pull the belt off, just loosen the tensioner and "jump" it one tooth. Keep those valves away from the piston and the power up, fix it.

roman944

can you explain this to me?

'cause I'm stupid ... lol

Van

No need for the flywheel lock - you're done with that.

What Dan's saying is to loosen the tensioner, then, with the slack in the belt, you'll be able to kind of move the belt so the next tooth lines up with the cam gear, and then a little bump of belt will "inch worm" around to the other side of the cam gear.

(After loosening the tensioner, this will make slack on the water pump side... if you need to jump teeth in the other direction, use a crescent wrench on the cam nut, or the crank nut, to move the slack to the top side of the belt. And, Dan's right, don't turn things over too much - just a little wiggle to play with the belt.)

Grasshopper

Actually, while we are on this topic, I have a quick question. I recently changed my timing belt, and after everything was tensioned, all of my marks lined up. The cam mark, OTC mark on top of flywheel, as well as on the bottom of the flywheel. But when it's running and I have a timing light hooked up to it, the timing mark is showing up as one tooth to the left of the mark. I could just have a lousy timing light, but I thought I'd check.

Rogue_Ant

The timing light is telling you ignition timing... Which isn't going to be the same as cam timing.

Van

Right - at idle, the ignition timing might be 9* BTDC - which would be 1 tooth off. At full load on a dyno, it might be 27* off.

Grasshopper

Thanks
Sorry, am used to working on carb'd small block fords. So, timing belts, overhead cams, fuel injection, all new things for me. But this is the first Porsche I've ever owned (87 944), and I'm more into working on it than anything else I've owned so far.

Van

You're not an engineer, are you?

Grasshopper

Nope. Parts stockroom attendant.