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How To Fluid Test a 4G63 Cylinder Head

BogusSVO

Proven Member
5,893
296
Jul 1, 2009
Pensacola, Florida
How to fluid test a 4G63 Head


This is a simple and quick way to check for seat and valve seal.

First clean the head by the method of your choosing.

Remove the cams and fLOLlowers so the valves are fully closed.

Once the head is cleaned, blow the runners out with compressed air to remove any carbon, oil or crud that can give a "false" seal.
036.jpg


Next lay the head with the runners up, and the valves facing you. I am starting on the intake side.
024.jpg

Now get a jug of fluid, I am using water.
025.jpg


Now here is the hard part..... Pour the fluid in the runners, one at a time.
026.jpg

Now that all four runners are filled with fluid.
027.jpg

Now look at the valves in the combustion chamber, no fluid. All is dry. This side is good and the intakes are sealed well.
028.jpg

Now flip the head over, and fill the exhaust runners.
029.jpg

Take note that you will have to plug the EGR passage so the fluid will stay in the runner.
030.jpg

Look at the fluid pour out past the valve, there is an issue that needs to be looked into. It is a bent valve.
031.jpg

Notice how the runner on the left of the divider still holds fluid, but the one on the right is empty. This is cylinder #4. If the left side will not hold fluid, check to make sure you have blocked off the EGR passage.
032.jpg


If you used water, blow the excessive water out with compressed air.
036.jpg

Then with WD-40
034.jpg

Spray WD-40 in the runners to inhibit rust formation on the valve stems.
035.jpg


Now at this point any valve sealing issues can be addressed and fixed.
 
Last edited by a moderator:

ontario AWD

Proven Member
107
1
May 27, 2008
North Bay, ON_Canada
My dad taught me that trick back in the day.On my small engines,i usually turn the head upside down and fill the cc with wd-40 and watch to see if it leaks out.:thumb:
 

BogusSVO

Proven Member
5,893
296
Jul 1, 2009
Pensacola, Florida
It is not really a trick, but a common pratice in machine shops and repair shops.
 

EtownPips90gsx

Probationary Member
4
0
Jan 13, 2011
Evanston, Wyoming
dang very helpful i did this process i was told by my friend to do this but i didnt use water i used gasoline, i now realize all valves are bent they all leaked on intake and exhaust side but a few. My suoer tech kit is wothless now. i was not told to clean the inside of the head so i didnt do that step would not cleaning head before checking the valves possibly give a false reading? I installed head and realized my oil pump siezed up and it sheaded the timing belt.
 

YZFR1

Proven Member
538
54
Apr 8, 2010
Atlanta, Georgia
I just tried doing this with water. After the first a few minutes, i started seeing some droplets forming. However, i let the water sit there for some time and didn't really notice the fluid level diminishing in the runners.

Does this sound acceptable?

Thank you
 

arrowhead

Proven Member
915
58
Apr 19, 2011
miami, Florida
Next time you are going to check by taking the valve cover off rotate the engine by hand and observe if all the valves are coming up to the same height or if any springs are lagging behind.

Looks like you will have bent valves, pistons dont look too bad, just clean out the high spots.

I use alcohol for those test mentioned.

Cheapest insurance new rod and mains bearings if you have gone this far
 
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