Glove still blows up after PCV repair.

Post by **June** » 07 Jul 2018, 15:16

jeffsws wrote: 07 Jul 2018, 05:36 What a disaster. Done a dry compression test today in a warmish car (had to drive about 15mins to get there.)

1 ---- 2 ---- 3 ---- 4 ---- 5
130, 135, 140, 150, 135

Then tried for a wet test. Put some oil in 1 and when cranking the car the pressure maxed out... 300+.... And when removing it smoke was coming out of it and number 3. I may have poured too much oil in. I then continued to test 2-5 without oil and each jumped about 20psi anyway.

Doesn't look good to me...

You should never remove sparkplugs from a warm aluminum head. Engine should be cold to prevent thread damage. June

Post by **erikv11** » 07 Jul 2018, 22:46

Whoa, ease up there June!

Compression is tested on I will estimate hundreds of *warm* (even hot) aluminum heads every single day, all across the world.

Use a smidge of anti-seize on the plug threads and don't worry about it for a second.

jeffsws · Post by **jeffsws** » 09 Jul 2018, 12:18

Okay, ran it again. Much cooler engine this time but not cold cold.

D: 130 140 150 155 140
W: 150 180 200 200 175

Didn't have a teaspoon handy but put in much less oil this time for the wet test.

Anyway, do those number say anything? I assume it's looking like new seals needed?

Post by **abscate** » 10 Jul 2018, 03:43

A bit of wear on rings but not too bad.

Post by **oragex** » 10 Jul 2018, 06:23

June wrote: 07 Jul 2018, 15:16 You should never remove sparkplugs from a warm aluminum head. Engine should be cold to prevent thread damage. June

I've read the same.. especially when removing them for the first time in 10 years. Better just undo them first with a cold engine.

Post by **oragex** » 10 Jul 2018, 06:24

jeffsws wrote: 09 Jul 2018, 12:18 Okay, ran it again. Much cooler engine this time but not cold cold.

D: 130 140 150 155 140
W: 150 180 200 200 175

Didn't have a teaspoon handy but put in much less oil this time for the wet test.

Anyway, do those number say anything? I assume it's looking like new seals needed?

Possibly some stuck compression rings? Also read these engines are not that kind on the valve seats..

jeffsws · Post by **jeffsws** » 10 Jul 2018, 08:46

So given the numbers that would likely explain the blowback?

Post by **abscate** » 11 Jul 2018, 04:26

My T5 numbers are down to about 130 but I don’t have any PCV pressure