Valve adjustment

91 5.0 lx hatch · September 25th, 2007, 01:03 PM

did a compression check could my valves not being adjusted cause a cylinder to go dead? cylinder number 8 on my 93 has no compression wat so ever. i just replaced the cylinder heads and cant figure it out it was running flawless before i Messed with it

ryans88gt · September 25th, 2007, 01:39 PM

Head gasket...most likely...

If your valves are set too tight they will not close all the way and you will have no compression. For a hydraulic cam, set the valves 1/4 to 1/2 turn past zero lash (when you can no longer freely spin the pushrods with your fingers). Adjust the intake valve when the exhaust valve is just starting to open. Adjust the exhaust valve when the intake valve is closing. This will assure that you are on the base circle of the cam when you are adjusting.

If you have pedestal mount rockers, you will need to use shims to get them set correctly, same 1/4 to 1/2 turn, but if it is more than that, put a shim under the rocker and try again until you get it right.

91 5.0 lx hatch · September 25th, 2007, 02:35 PM

im still kindof lost how could your valves get out of adjustment>?

91 5.0 lx hatch · September 25th, 2007, 02:43 PM

ok! so i adjusted the valves got it back together did another compression check and bam all cylinders are at 125 but cyliner number 7 and 8 7 is at 75 and 8=0 i have no idea wats wrong someone PLEASE HELP!

ryans88gt · September 25th, 2007, 04:43 PM

how are you adjusting the valves?

Do you have pedestal mount rockers or stud mount? What kind of heads are on it?

maybe your valves were never correctly adjusted when you put the heads on it. but a compression of 0 points to some major problem...like a seriously blown head gasket, a broken piston, or bent or maladjusted valves.

91 5.0 lx hatch · September 26th, 2007, 01:38 AM

well the car hasnt ran since the head swap. they are edelbrock performer heads. before the swap the car ran fine i actually kept up with 5spd bolt on 5.0's in my stock notchback.is there any way to tell if the valves or bent or maladjusted>? im new to most of this never ran into a problem like this before so i dont know what to do

the head gaskets were brand new and i torqued the heads to spec and torque sequence

ryans88gt · September 26th, 2007, 01:48 PM

Did you retorque the head gaskets? Did you check the block mating surface for straightness? If the car has never started, it is unlikely that it is the gaskets...but it is still a possibility.

Yeah, most likely you didn't adjust the valve train correctly. 1/4 to 1/2 turn past zero lash when the valves are completely closed. Anymore than that and your valves will hang open. If you aren't sure what you are doing, have someone with experience adjust them. One of my friends destroyed three camshafts because he thought he knew how to adjust the valves...
While you are checking the valves watch for any type of binding in the valve train.

91 5.0 lx hatch · September 26th, 2007, 02:00 PM

its at a shop so they adjusted the valves still cylinder number 8=0 i have no idea man they are ripping it apart i hope its not something expensive

September 25th, 2007, 01:03 PM	#1
91 5.0 lx hatch Regular 1993 5.0 notchback Join Date: Feb 2007 Location: Hawthorne,ca Posts: 86	Valve adjustment did a compression check could my valves not being adjusted cause a cylinder to go dead? cylinder number 8 on my 93 has no compression wat so ever. i just replaced the cylinder heads and cant figure it out it was running flawless before i Messed with it __________________ 93 5.0 notch-b303 cam,performer rpm heads,performer upper and lower,70mmthrottle body,shorty headers,h-pipe,flows,cai,1.7rr,built aod 91 5.0 lx hatch-Sold 92 5.0 lx hatch-Sold

September 25th, 2007, 01:39 PM	#2
ryans88gt MM Fanatic Join Date: May 2007 Location: Bloomington, IL Posts: 3,466	Head gasket...most likely... If your valves are set too tight they will not close all the way and you will have no compression. For a hydraulic cam, set the valves 1/4 to 1/2 turn past zero lash (when you can no longer freely spin the pushrods with your fingers). Adjust the intake valve when the exhaust valve is just starting to open. Adjust the exhaust valve when the intake valve is closing. This will assure that you are on the base circle of the cam when you are adjusting. If you have pedestal mount rockers, you will need to use shims to get them set correctly, same 1/4 to 1/2 turn, but if it is more than that, put a shim under the rocker and try again until you get it right. __________________ 89 LX 515 hp 497 ftlbs 88 GT 11.4 @ 118

September 25th, 2007, 02:35 PM	#3
91 5.0 lx hatch Regular 1993 5.0 notchback Join Date: Feb 2007 Location: Hawthorne,ca Posts: 86	im still kindof lost how could your valves get out of adjustment>? __________________ 93 5.0 notch-b303 cam,performer rpm heads,performer upper and lower,70mmthrottle body,shorty headers,h-pipe,flows,cai,1.7rr,built aod 91 5.0 lx hatch-Sold 92 5.0 lx hatch-Sold

September 25th, 2007, 02:43 PM	#4
91 5.0 lx hatch Regular 1993 5.0 notchback Join Date: Feb 2007 Location: Hawthorne,ca Posts: 86	ok! so i adjusted the valves got it back together did another compression check and bam all cylinders are at 125 but cyliner number 7 and 8 7 is at 75 and 8=0 i have no idea wats wrong someone PLEASE HELP! __________________ 93 5.0 notch-b303 cam,performer rpm heads,performer upper and lower,70mmthrottle body,shorty headers,h-pipe,flows,cai,1.7rr,built aod 91 5.0 lx hatch-Sold 92 5.0 lx hatch-Sold

September 26th, 2007, 01:38 AM	#6
91 5.0 lx hatch Regular 1993 5.0 notchback Join Date: Feb 2007 Location: Hawthorne,ca Posts: 86	well the car hasnt ran since the head swap. they are edelbrock performer heads. before the swap the car ran fine i actually kept up with 5spd bolt on 5.0's in my stock notchback.is there any way to tell if the valves or bent or maladjusted>? im new to most of this never ran into a problem like this before so i dont know what to do the head gaskets were brand new and i torqued the heads to spec and torque sequence __________________ 93 5.0 notch-b303 cam,performer rpm heads,performer upper and lower,70mmthrottle body,shorty headers,h-pipe,flows,cai,1.7rr,built aod 91 5.0 lx hatch-Sold 92 5.0 lx hatch-Sold

September 25th, 2007, 04:43 PM	#5
ryans88gt MM Fanatic Join Date: May 2007 Location: Bloomington, IL Posts: 3,466	how are you adjusting the valves? Do you have pedestal mount rockers or stud mount? What kind of heads are on it? maybe your valves were never correctly adjusted when you put the heads on it. but a compression of 0 points to some major problem...like a seriously blown head gasket, a broken piston, or bent or maladjusted valves.

September 26th, 2007, 01:48 PM	#7
ryans88gt MM Fanatic Join Date: May 2007 Location: Bloomington, IL Posts: 3,466	Did you retorque the head gaskets? Did you check the block mating surface for straightness? If the car has never started, it is unlikely that it is the gaskets...but it is still a possibility. Yeah, most likely you didn't adjust the valve train correctly. 1/4 to 1/2 turn past zero lash when the valves are completely closed. Anymore than that and your valves will hang open. If you aren't sure what you are doing, have someone with experience adjust them. One of my friends destroyed three camshafts because he thought he knew how to adjust the valves... While you are checking the valves watch for any type of binding in the valve train. __________________ 89 LX 515 hp 497 ftlbs 88 GT 11.4 @ 118

September 26th, 2007, 02:00 PM	#8
91 5.0 lx hatch Regular 1993 5.0 notchback Join Date: Feb 2007 Location: Hawthorne,ca Posts: 86	its at a shop so they adjusted the valves still cylinder number 8=0 i have no idea man they are ripping it apart i hope its not something expensive __________________ 93 5.0 notch-b303 cam,performer rpm heads,performer upper and lower,70mmthrottle body,shorty headers,h-pipe,flows,cai,1.7rr,built aod 91 5.0 lx hatch-Sold 92 5.0 lx hatch-Sold

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