| |
Click on image for the lowdown. 
====
| | | Forums66 Topics128,057 Posts1,055,816 Members48,426 | | Most Online14,466
Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
Lots of work on Brad's part ... pure enjoyment (and references) for you!
| | THANKS!
For helping keep this great
old truck web site
on the Internet for over 30 years! and not clogged down
with Ads!  Again, thanks!
| | | | Joined: Apr 2009 Posts: 29 New Guy | | New Guy Joined: Apr 2009 Posts: 29 | 235 running rough and knocking under load so I removed the valve cover and found the intake push rod out from under the rocker arm on #6. I was able to put back under and felt like it seated in lifter so ran engine and it looked to be ok. 0 psi of compression in 4,5 & 6. 1,2,3 120# 110# &90#. put air into # 4 spark plug hole and heard it leaking out thru I think exhaust.
removed rocker arm rack and tried again and was getting pressure trying to blow my hose out. removed #5 plug and the air into #4 comes out #5 plug hole so that would explain the air leak through #5 exhaust valve as the air went into #4. #6 seems to have some pressure now so maybe I had the pushrod too tight and it was holding the valve open. Maybe I 'll get lucky and only need a new head gasket and not cracked some where. any thing else I should try before I pull the head ? or what else should I look for? I had this post under 12 v coil before because I thiught it was a spark knock.
Last edited by chevymgb; 07/29/2009 2:22 AM.
| | | | | Joined: Mar 2002 Posts: 9,115 'Bolter | | 'Bolter Joined: Mar 2002 Posts: 9,115 | A valve sticking open some can allow the pushrod to pop out. If a valve is not closing all the way and you do a valve adjustment, the valve will be held open forever. This is because the valve sticking open a little creates excess clearnce in the valve train. If an adjustment removes the clearance then the valve can't close. | | | | | Joined: Apr 2009 Posts: 29 New Guy | | New Guy Joined: Apr 2009 Posts: 29 | Ok I get it now--- if the valve stuck open and the rod fell off and I may have opened it more when I replaced rod and tightend. so the intake on 6 was open all the time. any chance the stuck valve may have unstuck now because I think I'm getting back pressure out plug hole when I try to put air into it. I did push those valves down a few times by hand and removed rocker arm rack? | | |
|
|
| |
