I changed the headgasket on my sister's car, we even resurfaced the head and now she's getting 0 compression across the board, does anyone know why this is? I step torqued the head and used lubrication on the headbolts, can anyone give me a reason why this is?

 

cam timing wrong?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Garage 808 Hatch &raquo;</TD></TR><TR><TD CLASS="quote">cam timing wrong?</TD></TR></TABLE>

More than likely, this is your problem.

If your head gasket was installed upside down, or the bolts didn't get torqued tight enough, you would have some compression.

 

Both the intake - and the exhaust - mark line up, along with the Crank pully being at TDC... I'm 100% certain of this, and there was no bent valves before, so what else might be the problem...?

 

Are you opening the TB plate while cranking the starter during the Compression test?

Are you using the correct mark on the Crankshaft Pulley to set the timing belt? The lone white mark, not the 3 together that are used to set ignition timing.

What about the camshaft holders, did you torque those properly?

 

I did in fact open the TB plate while cranking, and even tried it shut and at partial throttle, NO COMPRESSION on any any cylinder. I'm 100% certain it's at TDC and both Intake and Exhaust camshafts line up. All cam Caps are torqued to spec, but I doubt that would cause no compression either, unless they weren't torqued at all- then the camshafts would bounce all around and [freak] up the the journals and lobes, and I'd lose oil pressure.

 

the cam gears are "UP" when at TDC right

 

Again, I'd like to make this 100% CLEAR, the cam gears are 100% aligned/ in Sync with the crank pully, being they are all at TDC. This is NOT an issue of TIMING. I went through it 3 times already, everytime it's the same result, and I did the timing earlier in the month and NOT ONE PROBLEM- I KNOW HOW TO SET TIMING, that's not the issue.

 

bump 4 da homie.

 

 

figure it out?

 

Adjust the valves.

 

By any chance did you replace the head gasket because the car had over heated? If so depending on how bad it did the rings could be siezed to the pistons. Seen this a couple of time's.

 

if your timing is correct, and your valves are adjusted properly then the only thing that leaves is bent valves. do a leak down test and that will pinpoint your problem, But considering the fact that all cylinders are dead (highly unlikely unless a tbelt broke) i would look into the timing as well. Does it sound funny when its cranking?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Turbowa &raquo;</TD></TR><TR><TD CLASS="quote">By any chance did you replace the head gasket because the car had over heated? If so depending on how bad it did the rings could be siezed to the pistons. Seen this a couple of time's.</TD></TR></TABLE>

Yes the car was overheated and the headgasket was blown.. It would only overheat after it was driven around for 10 minutes. As far as I know, it was never taken into the RED for tooo long, being not more than a minute. It started up just fine before the head was taken off, so I'm doubting it has seized rings...


<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by srmofo &raquo;</TD></TR><TR><TD CLASS="quote">if your timing is correct, and your valves are adjusted properly then the only thing that leaves is bent valves. do a leak down test and that will pinpoint your problem, But considering the fact that all cylinders are dead (highly unlikely unless a tbelt broke) i would look into the timing as well. Does it sound funny when its cranking? </TD></TR></TABLE>

It does sound a little funny when cranking over, but not "funny- valves slapping pistons", just a dead air kinda sound, like it's not getting any JUICE. It has spark, and it has fuel, it should crank over... The timing is dead on, I've done the timing 3 times now since the mishap, the first time when the water pump was changed (it was the original problem, unfortuntely my sister didn't address it in time), and all went smooth I put the timing in order, and boom, it started right up.. Finally, I did it when we changed the headgasket, and again after it didn't start up the first time to ensure the timing was not the problem...

Any more ideas?

 

ya, you dont have any compression. thats why it isnt running. You need to find out why it doesnt have compression. its gonna either be the rings or the valves....assuming that the timing is correct of course. And as far as the valves go they only hit the piston once and they are bent outta the way, so if it sounds funny you wont here anyhting hitting. You NEED to do a leak down test before you do anything else.