Timing is off on engine after valve seals help! - Toyota Nation Forum : Toyota Car and Truck Forums

yourmom23 · 11-27-2010, 09:27 PM

So i made the mistake of tearing into my wifes 1999 corolla. It was eating like a quart every 1000 miles. So i figured i would change the valve seals. So i changed them and put it all back together and it wont start the timing seems to be off. It chugs a little but nuthing. So how i did the timing was put the first cylender to top dead center. I did this by putting a compression gauge on the cylender. As soon as i saw positive pressure i turned the pulley till the notch lined up with the 0 mark. Then i matched the different colored links with the dimples on the cams. The two marks on the cam gears that say intake and exhaust were lined up parallel with the valve cover. I thought i had all this wright but apparently not cuz it will not start. Any help would be great thanks

Bitter · 11-27-2010, 11:08 PM

valve seals were not to blame, its a ring problem on the early 1zz's.

yourmom23 · 11-28-2010, 12:00 PM

Well some of the seals were like really hard, so it might have been some of it. Regardless i need to get the car going, The rings are just going to have to wait. Can you help me out with the timing i cant seem to see where i went wrong i followed the hanes manual but i must have done something wrong.

Bitter · 11-28-2010, 02:03 PM

post photo's of how things are sitting at tdc and timed right now.

boxer4luvr · 11-30-2010, 03:09 PM

Make sure you've got the wires sorted properly. we did a motor swap on a '98 Prizm and had the wires misplaced... it just hissed and sputtered and actied like it really wanted to run but just couldn't. .....we re-checked our efforts and found that we'd misalligned the wires with the coils, etc.
You can review our exploits via this thread:
8th Gen Motor Swap under way!

sam333 · 11-30-2010, 03:45 PM

Quote:

Originally Posted by yourmom23

So i made the mistake of tearing into my wifes 1999 corolla. It was eating like a quart every 1000 miles. So i figured i would change the valve seals. So i changed them and put it all back together and it wont start the timing seems to be off. It chugs a little but nuthing. So how i did the timing was put the first cylender to top dead center. I did this by putting a compression gauge on the cylender. As soon as i saw positive pressure i turned the pulley till the notch lined up with the 0 mark. Then i matched the different colored links with the dimples on the cams. The two marks on the cam gears that say intake and exhaust were lined up parallel with the valve cover. I thought i had all this wright but apparently not cuz it will not start. Any help would be great thanks

What all did you take apart? Did you remove the head? Did you remove the timing chain from the crank( lower sprocket)?

Sounds like you did it right. When your pulley mark is on zero and your at TDC, just make sure that the intake and exhaust cam lobes on # 1 cylinder are pointing at each other and at about a 30 degree angle(which they should be if you lined up the cam marks with the top of the timing cover).

yourmom23 · 11-30-2010, 08:55 PM

Quote:

Originally Posted by sam333

What all did you take apart? Did you remove the head? Did you remove the timing chain from the crank( lower sprocket)?

Sounds like you did it right. When your pulley mark is on zero and your at TDC, just make sure that the intake and exhaust cam lobes on # 1 cylinder are pointing at each other and at about a 30 degree angle(which they should be if you lined up the cam marks with the top of the timing cover).

Yeah thats how it is i and i checked the plug wires already. The only thing i can think that it is, is that i didnt put it to tdc before i removed the chain which what a dumb move. I think now it is firing the wrong cylinder. I dont know how that works or how to adjust the firing to the number one cylinder.

I did think that it was off a 180 deg on the exhaust stroke but its not i watched the valves open and they are going in the right order, so i dont know im stumped at this point.

yourmom23 · 11-30-2010, 08:59 PM

oh and its dumping fuel in and not burning it cuz i can smell the gas. So the firing order has to be off.

sam333 · 12-01-2010, 01:18 AM

Check to see if you have spark.
Pull one of the plugs, keep the the plug wire on it and ground the bottom of the plug on the engine( prop it up or hold it with insulated pliers) and have someone crank the engine over. Watch for a strong blue spark.

If you installed it as above it should be right. Do you have a manual?

As far as the pistons go , if you start with #1 piston(far left piston as you face the engine) on TDC and your crank pulley notch on zero, everytime you turn the crank 360 degrees that piston will be on TDC. Whats confusing to many people is, that while the piston is at TDC every 360 degrees , its only at TDC on the compression stroke every 720 degrees( if you started on TDC compression). Its because the cam only turns at 1/2 the crank speed.

So it takes two full revolutions ,720 degrees of the crank and 1 revolution, 360 degrees of the cam to complete the 4 cycles of (you guessed it) a 4 cycle engine.

Starting on TDC compression/ power, then 360 derees later TDC exhaust/ intake( this is a rough description and doesnt take valve duration/ overlap into account).
.
I know you said this is how you did it , but you still seem unsure. If you follow these instructions below you will be able to check the valve timing properly.

Have your crank pulley notch on 0, then your #1 piston will be at TDC( it may be on TDC compression or may be on TDC exhaust / intake ). Next look at your cams, if the marks on the exhaust and intake cams are be lined up with one another, and parallel to the top of the timing cover then you are on TDC compression( where you want to be). If the cams are not in this position, turn the crank pulley a further 360 degrees, once again lining up the crank pulley notch with the 0. If the cams did not line up the first time they will this time. IF THEY DONT your chain is on wrong ( the cam position to the crank is wrong). Yo will have to reinstall your chain.

yourmom23 · 12-04-2010, 01:09 PM

Well it finally started and the timing sounds right but, the valves are chattering like crazy. I dont understand why i torqued the caps down to spec and it is just sounding almost like there is no oil which there is. I dont know, this really blows.

sam333 · 12-05-2010, 02:41 AM

I dont exactly know what you mean by chatering, but somthing is not right. Recheck it again . Its not magic, if its not working right you put it together wrong. Follow the directions above exactly and it will work. I just completly rebuilt one of these and it runs great.

yourmom23 · 12-05-2010, 09:55 AM

I think it kinda sounds like the timing chain is loose, like its sloppin around a little did you reset your tensioner when you did yours?

yourmom23 · 12-05-2010, 01:35 PM

Well i think i got this one licked ha it turned out that the chain tensioner wasnt set right. I reset everything and she runs like a charm. Well there is a little steam/smoke coming out the back of the valve cover, i think it needs a new gasket.