Need help on my timing...

[RunningMan]

Im working on my friends 90 eclipse gsx and Im doing the timing belt on it, but this thing is driving me crazy. I have never worked on the 4g63 motors before but I am going through th Hayne's book but it dont help much. This is what I have done so far:

1.) Set both the Cam gears Indicator pin to 12 0'clock.
2.) Set the crank gear to the timing mark, setting the 1st cylinder to TDC.
3.) Set the oil gear to the timing mark.
4.) Put on the timing belt over the cams (setting the cams groove marks with a straigh edge).
5.) Set belt around the tensioner pully, crank, oil crank and idler pully.
6.) Put the auto temsioner on, and set the tensioner pully.

This is what I have done and tried to start up the car. All i got out of it is the car cranking but no combustion, the car isnt turnning over. Now I have a few question:

1.) Most of the 4 cyl DOHC motors that I have worked with, the intake and exhuast cam shaft lobes are opposite to each other, one open one close. But for this motor when I set the indicator pin on the cams to 12 o'clock, the cam shaft lobes are facing and going in the same direction. I dont think that this is how its supposed to be.
2.) I believe that the first cylinder should be the one next to the cams. Or is it not?

I really need help because the book aint helping. Im not so familiar with the motor so I need some of you pro's to help me out. Any help will be useful. Thanks.

 

[evil_eagle]

So your saying it is turning over but no start correct? Check to see if it is getting spark, and fuel. If you are getting both then you did not line the timing marks up correctly and result a possiably bent valves, these are interference motors, if the marks are off like 3 teeth then you smaked the valves ontop of the pistons.

Does it turn over like it has comprssion? Most of the time you can tell if the car has compression or not by turning the car over.

Here is a link for timing belt jobs, pretty straight foward. http://www.vfaq.com/mods/timingbelt-1G.html

Good luck..


-Jake

 

[RunningMan]

I pretty much set everything correctly, the marks on the cams are set alined to the groove marks on the teeths. The only thing that I get from the motor is just the crank and cams spining no compression or combustion, its like your turning the crank yourself. Could bent valves be causing the motor to not turn over? Im thinking that he might have switched the cam gears to the wrong shaft when he reinstalled the new oil seals on the cam shaft.

I checked for fuel and the car is getting fuel, but i didnt check for spark because this motor dont have a distributor cap. How would i check for spark. Does the intake cam have bigger groove marks on the cam then the exhaust cam?

 

[evil_eagle]

I pretty much set everything correctly, the marks on the cams are set alined to the groove marks on the teeths. The only thing that I get from the motor is just the crank and cams spining no compression or combustion, its like your turning the crank yourself. Could bent valves be causing the motor to not turn over? Im thinking that he might have switched the cam gears to the wrong shaft when he reinstalled the new oil seals on the cam shaft.

I checked for fuel and the car is getting fuel, but i didnt check for spark because this motor dont have a distributor cap. How would i check for spark. Does the intake cam have bigger groove marks on the cam then the exhaust cam?

To check for spark grab a old spark plug, pull one of the plug wires off then just the old plug in the wire and lay it on the exhaust manifold, DONT HOLD IT!! , have another guy crank the car and watch the plug, you will know if you have spark or not.

Do a compression test as well, that will tell you if you bent the valves, most of the time it's the exhaust valves that get bent.

-Jake

 

[RunningMan]

Ill try to do a compression test on it...If it was due to bent valves, wouldnt the motor be ticking or be making a ticking noise? Also, shouldnt the cam shaft lobes be pointing in opposite directions on each cam shafts when i put the cam shafts on? Or is the 4g63 motor just like that having the lobes be in the same direction on both shafts...

 

[studboy800]

Hey, I just bought a laser and the guy said he messed with the timing belt and it would not run I replaced boath and have spark and fuel this thing wont run either sounds like the same problem keep us posted on your progress.

 

[RunningMan]

Sure will...

 

[RunningMan]

Need these questions answered:

1.) How are the cam shafts positioned on your motor? Are the lobes on the cam shafts facing in the same direction or in opposite direction?

2.) Is the #1 cylinder is the cylinder that is the one by the passenger side (the fourth one away from the camgears)?

 

[NOSLO2PT0]

Need these questions answered:

1.) How are the cam shafts positioned on your motor? Are the lobes on the cam shafts facing in the same direction or in opposite direction?

2.) Is the #1 cylinder is the cylinder that is the one by the passenger side (the fourth one away from the camgears)?

Don't worry about lobe placement. Just make sure all the rocker arms are on good and solid. Run a straightedge THROUGH the centerline of the cam gear bolts. The lines on the gears should line up EXACTLY with the centerline of the bolts, if the motor is in time and the engine is at TDC on #1. As for the ticking sound, once the valves get bent, they don't tick anymore. They are already out of the way

Cylinder #1 is closest to driver side. Do a compression test on each cylinder before you go any further. This may answer a LOT of questions.

 

[lownslow2002]

I would guess that the fact that you are setting TDC on the #4 cylinder instead of the #1 cylinder would be the root of your problem. Good luck with it and let us know what happens.

 

[NOSLO2PT0]

I would guess that the fact that you are setting TDC on the #4 cylinder instead of the #1 cylinder would be the root of your problem. Good luck with it and let us know what happens.

OK. STOP. You obviously know nothing about these engines either. Put the tools down, and step away from the car. Take a head off a 4G63 and turn the crank. Tell me what happens.

 

[IgotNoMods]

I would guess that the fact that you are setting TDC on the #4 cylinder instead of the #1 cylinder would be the root of your problem. Good luck with it and let us know what happens.

I would hope if # 4 is TDC that #1 was TDC. heh

 

[Projectpat115]

Make sure that the cams are both facing the right way. Both cam gears have a dowel in them, that dowel must be up on both gears. #1 cylinder is closest to the passenger side

 

[NOSLO2PT0]

Make sure that the cams are both facing the right way. Both cam gears have a dowel in them, that dowel must be up on both gears. #1 cylinder is closest to the passenger side

Reviving ANOTHER dead thread? At least give CORRECT info when you do. #1 is closest to DRIVER side, not passenger side.