Compression test results

[cckc135r]

So I completed the compression test and here is what I got.
1. 150
2. 145
3. 150
4. 150
5. 95
6. 150
This was cranking pressure clutch disengaged and throttle wide open and engine cold. I guess nexy i'll head down to the parts store to get a cooling system pressure tester. I also pulled the radiator out. Cooling fins were clogged with dirt so I washed all the nastys out and ran clean water through the radiator. It was dirty but nothing chunky. So I'm looking opinions on the 95psi cylinder. Here's what I'm thinking of doing along with pressure checking. Pulling valve cover off to make sure the rockers are adjusted right too. forgot to mention that t
he spark plug was good and showed no signs of a head gasket. So offer up what you think gentleman and ladies. Thanks in advance for your thoughts.

 

[Big Jim M]

#5 seems to be having a difficulty, doesn't it? Could be anything. Might be a broke ring. Might be a burnt valve. Might be a ruint piston. Most likely isn't a bad head gasket, but is a possibility.
So here we go. We take the head off and do an inspection. Since we know we are looking at the #5 it should be rather easy to find the problem.
Big JIm

 

[chalkerbob]

Low commpression

Squirt a little bit of oil in #5 if it gets better its rings if not its valves or head gasket but head gasket would be using water from radiator

 

[Hotrodlincoln]

I'll second a wet compression check.

You can do a leak down test to find out what is causing the poor compression.

 

[cckc135r]

Alright fellas, Thanks. I'll have to get a leak down set up....I like gettting new tools. Forgot about shooting some oil into the cylinders. Try that in the morning when I leave work and I'll post up what comes of it. Other than the number 5 cylinder the truck runs really well and very smooth idle. Looking forward to getting it on the road.