Engine No compression

[Andresquintana.mma]

Hey everyone I bought a roller a couple years ago and my mom had a rebuilt engine in her fox didnt drive it much. The engine is a 302 bored to a 306, tfs aluminum heads, B cam, Holley systemax intake, t5 tranny. She parked it one day and it just sat there. Recently her house insurance made her get rid of it, I couldn't get it ruining in the time I had so I pulled the engine and took it home. I slowly replaced all the gaskets and painted the block etc. I few months ago I tried to start the car and it turned on but wasnt ruining right. Pulled the heads and the valves were leaking pretty bad. Took them to a local shop and had the heads rebuilt. put everything back together and wont even try to turn on. I checked compression and had 0 lbs on both sides. I pulled everything off today and the spark plugs and valves on the heads look brand new. Like I didnt even crank the car. What would cause no compression? IM getting spark and fuel pressure. I have mostly everything off right now besides driver side head and timing cover.

 

[General karthief]

First thing that comes to me would be valve adjustment incorrect, valves adjusted to tight can hold the vales open - 0 compression

 

[Andresquintana.mma]

First thing that comes to me would be valve adjustment incorrect, valves adjusted to tight can hold the vales open - 0 compression

Are you talking about when you rotate the crank and adjust each rocker? If so I’m pretty sure I adjusted them correctly. I just wait until the opposite rocker is about to go down and then finger tighten it but you can still spin the push rod by finger then lock it with a quarter of a turn.

Or are you referring to the heads being rebuilt?

 

[General karthief]

Are you talking about when you rotate the crank and adjust each rocker? If so I’m pretty sure I adjusted them correctly. I just wait until the opposite rocker is about to go down and then finger tighten it but you can still spin the push rod by finger then lock it with a quarter of a turn.

Or are you referring to the heads being rebuilt?

Install - Installation Of Ford Racing (and Other) Stud/pedestal Mount Roller Rockers

Gearbanger 101 submitted a new resource: Installation of Ford Racing (and other) Stud/Pedestal Mount Roller Rockers - Roller, Rocker, Stud, Pedestal, Ford Racing, FRPP, M-6564-ALL Click the download sidebar above for printable PDF format. Read more about this resource...

www.stangnet.com

This should cover the adjustment procedure on both types of rockers

 

[AeroCoupe]

This is how I adjust my stud mount hydraulic roller rockers:


View: https://www.youtube.com/watch?v=-S3EuaAz7jg

Thing you have to do is put the lifter on the base circle of the cam for each rocker you are wanting to adjust.

 

[Andresquintana.mma]

I’ve done roller rockers before and I’ll re watch this video. A couple questions before I get started today on the car.
Would there be no compression if my timing chain isn’t alright correctly?
Is there a way to test compression with out putting the engine all the way back together? Can I throw the head on and adjust the rockers and test like that? With out putting all the accessories and manifold on?
Thanks in advance.

 

[AeroCoupe]

Bolt the fully assembled head (read valves installed with springs, retainers, and keepers) up with no rockers and test. Valves should be 100% closed being there is no way to open them.

 

[JD1964]

For stud mount adjustable rockers on any engine I most recently started using this method. Ive adjusted a lot of valves in my day and I wish I would have known this all along.


View: https://youtu.be/XR4W-MWjEyI