easyloader
Seaman
- Joined
- Apr 25, 2014
- Messages
- 68
I just finished up replacing valve seals in a 4.3 mercruiser with balancing shaft and efi. (first time)
When replacing the seals I would bring the cylinder I was working on to top dead center then put 50psi of compressed air. The problem I'm having is with #5 and #3 cylinder intake vales.When finished replacing the seals the cylinder valves are aren't leaking however when I start tightening down the rocker arm it slightly compress's the spring and air comes out the throttle body. To verify the issue I started at no 1 cylinder tdc added compress air to it to check for leakage and then rotated motor 120 degrees and check #6 and so on down the firing order. I did this three times to verify the issue is in #5 and #3. I also made double checked the push rods and shot air down the push rod hole in case something got in the top of the lifter.
A couple of weeks ago I performed a leakdown test and only had 12 percent leakage and no air coming from throttle body.
I learning to the hydraulic lifters but don't want to tear stuff apart to get at the lifter unless I need to.
If anyone has any ideas it would be great.
When replacing the seals I would bring the cylinder I was working on to top dead center then put 50psi of compressed air. The problem I'm having is with #5 and #3 cylinder intake vales.When finished replacing the seals the cylinder valves are aren't leaking however when I start tightening down the rocker arm it slightly compress's the spring and air comes out the throttle body. To verify the issue I started at no 1 cylinder tdc added compress air to it to check for leakage and then rotated motor 120 degrees and check #6 and so on down the firing order. I did this three times to verify the issue is in #5 and #3. I also made double checked the push rods and shot air down the push rod hole in case something got in the top of the lifter.
A couple of weeks ago I performed a leakdown test and only had 12 percent leakage and no air coming from throttle body.
I learning to the hydraulic lifters but don't want to tear stuff apart to get at the lifter unless I need to.
If anyone has any ideas it would be great.