lotta smoke :(
 

ok so..... my 91 civic dx (16 valve sohc) engine is buring oil. the spark plug and exhaust port on the 4th cylinder are all oily and gunked-up. im takin the piston out (hopefully tomoro if i have time, if not then ill have to wait till next week sometime) to check the rings, piston and cylinder wall. i've already checked the valve seals and they seem ok but im gonna put on new ones anywaycus i have some (other wise i'd just throw them out).

if anybody has any ideas feel free to let me know ;)


oh and by the way the whole car has over 300 thousand kms on it so yea.....

RE: lotta smoke :(
 

Have you tried running a compression test? I would start there before tearing into the block

RE: lotta smoke :(
 

ya the compression in the 4th cylinder is slightly lower than the rest of em.

RE: lotta smoke :(
 

What were your numbers?

RE: lotta smoke :(
 

they were all at 153/154 except the 4th of course which was a little lower by about 5/6

im taking the piston out next week to check the rings and then ill put it all together and run another compression test.

RE: lotta smoke :(
 

piston, bore and rings are in the same condition as the others. just checking pricing and other options

RE: lotta smoke :(
 

so oil is coming up past the rings on the 4th. im gonna put new rings on all pistons and hone the bores put it all back together and see how she runs.

RE: lotta smoke :(
 

Your rings are going out. Run a leak-down test to find out which ones.

RE: lotta smoke :(
 

i didnt check and i was drivin w/ no oil then my father put too much oil in it. and it was smokin a lot. all dat messed up my engine. instead of gettin it fixed i got my mechanic to find me a new stock engine. it was a lil bigger. went from 1.5L to 1.6L cost me $1000.