I am working on a 1997 Ford Ranger XLT 4.0 liter OHV engine and trying to perform a cylinder leak down test on each cylinder. I have the firing order for my engine as, 1-4-2-5-3-6.

Compression readings from the compression test were the following:

Cylinder 1 175psi
Cylinder 2 170 psi
Cylinder 3 165 psi
Cylinder 4 150 psi
Cylinder 5 175 psi
Cylinder 6 165 psi

I am just trying to run a cylinder leak down test on each cylinder. I believe I can find cylinder one TDC, easily, but I get lost from there... Should I just simply count four notches on the harmonic balancer to get to cylinder 4 TDC from TDC of cylinder 1?


Suggestions? Thoughts? Recommendations?

 

There's a list which shows which cylinders are closed starting with #1TDC. It's circular (as in degrees of a circle). You turn the crank to arrive at cylinders in their closed positions.

It's the most efficient way to hit each cylinder at the top of its compression stroke.

The total number of crank turns is less that you might think. I just can't remember what they're called.

 

cylinder 1 had a 16% leakage coming from crankcase.
cylinder 4 had a 32% leakage and I am struggling finding where the leakage is? It's not coming from the exhaust tailpipe... or crankcase...
Still have to test the other 4 cylinders.

 

Sniff test the coolant

 

I looked for bubbles in the coolant. No bubbles in coolant.

 

Are you referring to combustion leak test? The test utilizing the fluid that changes color when combustion/carbon monoxide is present in the coolant?

 

Yes. Sorry for the colloquialism.