steeltoe

1991 EF civic 1.5 L 5-speed 135000 miles, original short block, rebuilt head, oem head gasket


I had white smoke coming out the tailpipe and leaving a huge smoke screen so bad I had to have it towed home. I had the head inspected at the machine shop. It was an already rebuilt head with less than 20k on it. the machinist pressure checked it, checked for warpage, everything was good so then I had it resurfaced.

I then replaced the head gasket with a new oem metal one, and retorqued in sequence with arp studs to 65 ft lbs.

when I first took the head off, the head gasket was fine, no signs of failure but I replaced it anyway with a new one.

I put everything back together today started it up an the same white smoke all over the place!

This may be pointing to a cracked block but what are the chances of that happening to a fairly low mileage block? Its a daily driver and I never drive it hard.

is there anything else that may be causing this???

thanks

grumblemarc

iTrader: (4)

Leakdown test. Run one.

ED3 SEDAN-GSR

Since its back together and running again, just let it run and see if the smoke goes away. When i did a head gasket on my gsr swap it smoked bad for about 10 min until it burned all the coolant out of the exhaust and ive had no smoke since

steeltoe

ok so I went to my basement and found my leak down tester, first time using this:

first I ran the car for about 10 mins and smoke volume stayed the same, bad.

I removed all spark plugs (they went in clean) and cylinder 3 spark plug was coated in oil, also smoke was still coming out of cylinder 3 when I pulled the spark plug.

I had to leave but when I came back I tried to run a compression check on 3 but the battery was too weak for an accurate test. it cranked maybe 4 times barely before battery gave up.

I went straight for the leak down test right after and here's what I got.

of cylinders 4,3,2,1 => facing drivers side:

being at top dead center for each cylinder; cylinders 4,2,1 all held pressure within 5 psi of pressure going in. Had about 95 psi going in and reading were roughly 85-90 in cylinder and held. heard minor hissing from oil cap hole but surely from the small leak (maybe from the 5spi ish).

now cylinder 3 was loosing a lot of pressure. 95 psi going in and 45-50 psi in cylinder. there was a much stronger hissing coming out from the oil cap hole BUT also from the intake throttle with hose removed. all of the other cylinders DID NOT hiss through the intake.

I'm a bit confused...hissing from intake indicates an intake valve leak but this is a newly refreshed head. could head intake valve be damaged? it was definitely at top dead center. I verify this by removing distributor cap cover when manually turning crank and let the distributor sit at top dead center of the cylinder being tested. also I have a stick inside the cylinder while turning and I can see when the piston is rising up to TDC. if it goes a little past - indicated when the stick starts to go back down- then I reverse a bit to get it back at TDC.

so... a lot more hissing from cylinder 3 at the oil cap hole AND the intake. worn/broken rings??? and/or intake valve???

thanks in advance

I may just do a compression test too but I'm thinking what's the point that cylinder is shot for sure