SR with no compression after head gasket change?

[sil80dude]

Ok so heres the deal. I wanted too put a new head gasket on my sr so i pulled the head and got it decked. While i had the head there i told them too pressure check it and go over the valve train and install new valve sealsSo i get that and put my new cosworth HG in and everythings looking good. I go too start the car and it doesnt sound right at all. I put a compression gauge one cyl 1 and 0psi so i check all the other cylinders and. Yguess what!? zero compression. So i look at the timing and tple checkso it. Timing is bang on. So i do a leak down test with the cams in. I pump 120psi in the cyl and basaically zero leadownkdown on all cylinders.Weird right. So then i do some research on people who have done head gaskets and had no compression. I foundout that a common problemis that the hydraulic lifters dont pump up allowing the valves too travel all the wafy = no compression. . So i put 100psi in cyl 1 and turn the motor by hand and guess what? the air pressure doent drop a bit throughout a few full rotations. I have bled the lifters a few times and put them in. Nothing. I just bought new lifters and bled them put them in and nothing! Still no compression. I just dont know what the heck i could be doing wrong. My question is their way the machine shop could have messed anything up because im at a loss as to what is going on. Any ideas would be awesome!

[cotbu]

I foundout that a common problemis that the hydraulic lifters dont pump up allowing the valves too travel all the wafy = no compression

That's a No! There's springs involved, thats what keeps the valve closed when the cams are at position, or out off the head. Not the lifters. I'm sure you can think of other reasons why a valve might not close. A lot of ridiculousness being posted lately, maybe I'm just out of synchronization.

Yes the machine shop could have messed up, but you could have too!

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[Mikester]

So TBH, what I am getting is that all 4 combustion chambers will hold 120psi all day long, but there is no compression when trying to start it?

If that's the case, my 'Captain Obvious to the rescue' question would be: Are you using the right spark plugs?

[joe3180]

I go too start the car and it doesnt sound right at all.

What didn't sound right about it? What was heard?

[fliprayzin240sx]

Double check your mechanical timing. I'm thinking its off a tooth somewhere.

[sil80dude]

Yes no compression when turning it over.
Spark plugs are good. Brand new Bkr7e's
If i put 100psi in a cyl and turn it over by hand their is no loss in pressure. Like the valves wont open at all.

What i ment when i said it didnt sound right is it sound like it had no compression. Checked it and it had none when turning it over.


I took the head off with the cams lined up on TDC of the comp stroke. With the timing chain marks lined up with the cams.

Im going too pull off the front timing chain cover and check that the bottom link is lined up with the
crank sproket this weekend.

The machine shop just decked the head and put valve seals in how could anything get messed up?

[sil80dude]

So i pulled off the front timing chain cover and the gold link was aligned with the. sproket perfectly. So it looks like my mech timing was on the whole time. I build no compression. but hold leakdown pressure. Any ideas?

[Danger_Dorn]

Hey I JUST had this same problem for like 2 months. Turns out my starter wasnt getting enough amps so get like a badass battery or wall charger and zap the shit out of it. My engine started right up. The problem was not enough OIL PRESSURE to the LIFTERS! Keep an open mind people. My lifters need to be bled again since I tilted the motor putting it in my car but low oil psi when starting is your problem. Get alot of power and crank that bish. :bigok:

[Danger_Dorn]

That's a No! There's springs involved, thats what keeps the valve closed when the cams are at position, or out off the head. Not the lifters. I'm sure you can think of other reasons why a valve might not close. A lot of ridiculousness being posted lately, maybe I'm just out of synchronization.

Yes the machine shop could have messed up, but you could have too!

Sent from a Highly Tuned SIII using Tapatalk HD

:bs: Do you have personal experience with this? NO? I do. Its his lifters

[cotbu]

:bs: Do you have personal experience with this? NO? I do. Its his lifters
Sorry bout this post! I was reading alot of dumb shit and then read your post!
Just think about it, damn!
The reason for edit, because I know what wrong with your engine, but I wouldn't feel good helping you after that reply so I edited it.