Changing timing belt
The reason you would have used a timing light on a sr20 motor is because it uses a rotor style distributer for ignition if built before 1994.When you adjust the rotor,a timing light helps. It would serve absolutely no purpose on a 4g63 with electronic/digital ignition.
timing marks on cam gear should line up with valve cover. timing marks at the bottom on the oil sprocket and crank sprocket should line up as well. This applies to 4g63 motors. If you have a built 4g64 block, then the marks wont necessarily line up - theres a theread talking about timing on 4g64 blocks
yes, follow the how to's on here, there's 2 different ones I believe
yes, follow the how to's on here, there's 2 different ones I believe
You can do the screwdriver trick in the inspection hole. (You'll have to remove the DP IIRC on a stock turbo set up
Or
Put dot on oil pump sprocket at 12 O'Clock if the sprocket wants to turn CCW your in phase if it wants to move CW it's 180* out, turn it 360 and it'll wanna go CCW and you'll be in phase.
Works every time haha
The oil pump sprocket it tied to a front balance shaft and if it is not lined up then the counterweight will not be in "time" and can vibrate the engine.
The only time that the sprocket orientation doesn't matter is when you have a balance shaft removal kit installed, either a concentric shaft with no weight, or a mirage stub shaft. In that case, you would not even have a rear balance shaft installed so that information you read is wrong in several ways.
The reason you would have used a timing light on a sr20 motor is because it uses a rotor style distributer for ignition if built before 1994.When you adjust the rotor,a timing light helps. It would serve absolutely no purpose on a 4g63 with electronic/digital ignition.
Line up the marks, fire it up, use a scan tool and double check your timing.
There is no double checking the timing after its fired up on these engines. Your risking a very expensive disaster. After the belt is installed and before you install the covers, rotate the engine by hand 10 times checking the timing marks to make sure they keep lining up.
there is no double checking the timing after its fired up on these engines. Your risking a very expensive disaster. After the belt is installed and before you install the covers, rotate the engine by hand 10 times checking the timing marks to make sure they keep lining up.
Last edited by yenny; Sep 26, 2012 at 03:01 PM.
Just to clarify, everything is in line with the exception of the oil pump sprocket, it is approximately a half tooth behind, the car seems to idle and run fine, I am driving it tonight so I should be able to give you guys the full story of how it feels.
Oil pump sprocket should line up perfect, I hate to say that. I would expect the balance shafts to be slightly out of phase with the motor if it's off slightly. I would think you could feel that...








