0351jt

I'm back again, 2001 civic EX, had a overheat which then wouldn't stop burping using a no spill funnel so I ended up replacing the engine (JDM D17A).
https://www.civicforums.com/forums/3...se-bucket.html
Now after replacing the engine, all hose, bypassing the heater core and idle valve, the car still won't stop burping. Only the radiator is original. I haven't driven the car, just burping it after all the repairs.

I thought I had another bad HG. I pressurized each cylinder at TDC with 150 PSIG as show here and didn't get any hits, no bubbles, no increase in fluid amount.
https://www.civicforums.com/forums/3...ml#post4537185

I was sure that I was at TDC, as I checked the valves, what else could I have done wrong to perform this test incorrectly?

I am using a residential air compressor, max tool output 175 PSIG, I'm using 1/4 hose about 15 feet flexible...maybe 1/4 inch hose is too much of a pressure drop?

I could try the test again at 175.

Basically when I'm burping the car no matter how long I run it each time the thermostat opens I get a ping pong ball sized bubble. Is it possible this is just water vapor? I've never used the no spill funnel on a known good car so I don't know whats normal. It is about 110 with the car in the sun when I'm burping it on a incline.

Just for fun I will pressure test the radiator.

Thanks again.

Slumpertcivic

ezone

It probably needs a head gasket too.







Did you remove the Schrader valve from the end of the whip before screwing it into the engine? If you didn't remove that, then all air pressure you thought was going into the cylinder just stopped at that Schrader valve.





So with Schrader removed.....

You have to make sure the cylinder you are pressurizing is actually on TDC, not overlap. You should be able to hear a big difference when you connect air to a cylinder with valves completely closed (TDC firing) vs. one with valves slightly open (TDC overlap).

0351jt

I get where your going there, thanks.

It does take about 20 min at idle before the tstat opens...won't be a issue running that long with a plug?

0351jt

I hear you, the simplest explanation and all that. Reason for my post is this would be the 3rd head gasket I've condemned using the no spill funnel and burp test, starting to question my method.

I did remove the schrader so it pressurized the cylinder, I'm in residential HVAC so I'm familiar with scharders and pressure tests more then nuts and bolts.

Had the valve cover off so I was using the timing marks and firing order to determine TDC. I'll redo the test tomorrow with 175 and misalign one to see how it sounds, the noise it was making at the time was just like filling up a empty can with freon, air didn't appear to be escaping out the intake or exhaust.

ezone

Start with a HOT engine.
You've got to look at how low the top of the radiator is in relation to the water neck on the engine, and the coolant chamber inside the cylinder head... there can be a huge air pocket trapped in the engine and head that's higher than the radiator. That's why we usually say to raise the front of the car as high as possible and hold the RPM up to try to push those pockets on through to the radiator


......and the tip of the funnel adapter sticks down into the radiator a ways, sometimes there is lots of room to trap air between the bottom of the funnel and the top of the radiator.
I shaved the end of my funnel adapter flush with the rubber ring to reduce the issues with trapped air pockets there.

If I see the endless stream of bubbles in the funnel on a running engine, I don't like to make a final conclusion on that alone. I will then move to the other test, pressurizing individual cylinders and looking for coolant level to rise in the funnel. It's only 10 extra minutes to be absolutely positive LOL

I have an 04 on the hoist right now with the head off, was leaking on cylinders 2 and 3. Head was not warped. It will get a head gasket in the morning.

Treedguy

Wankenstein

If I ever install an engine I will install a new head gasket on it prior. Too many threads on various sites where people have head gasket troubles when they install an engine. LKQ, JDM sellers, etc...do not know an engine's history.