2RotorSpeed

iTrader: (1)

I bought a S5 Tii JDM engine and recieved it a couple-a-days ago.

The following things were all done while the engine is outside the car in a shop:

I took the spark plugs off, and the tubro + whole exhaust manifold off, to look inside the chambers and at the rotors. All colors looked good. A bunch of carbon build-up as expected. So then I put some ATF from the oil filter, leading/trailing spark plug holes, and ofcourse the exhaust ports (filled it with as much as I could). The next day, we turned the engine slowly, and soon it started moving pretty smoothly. We started rotating it in full revolutions while making sure every single apex seal is in good condition and not stuck. BUT, one of the apex seal is sort of stuck, causing it to not hold good compression like the others (one of the front rotor apex seal). While rotating the engine, through every pass of the apex seal over the exhaust ports it produces a strong "puff" sound... indicating decent compression, but when this certain apex seal passes, the is bearly any sound. All the other apex seals seem to mover smothly, but this one is hardly moving at all. What I did for tonight is flood the front chamber with ATF and move this rotor so that this apex seal is sunk under the ATF and maybe will remove more of the carbon build-up and maybe get it to move freely again. I know this engine has probably not run in months or even years... so I have to ask this question.

My question is: Is this a temporary problem? Or does this indicate that the engine needs to be rebuit? If the apex seal does not get un-stuck after all this ATF, should I just do the swap and hope it goes back to normal after I run the engine for a while? Are there any other safe ways I could use to treat this problem?

Thanks

walken

iTrader: (6)

wipe the seal off and spray it with some pb blaster. Then use a plastic rod and start massaging the seal with it. If you are lucky it is just stuck and not broke where you can't see it.

FC3MAN

yeah some penitrating oil and a little love goes a long way,remember though when you de carbon an old motor all that(****)your scraping of the rotor housings and irons will end up in the apex seal grove and on the seal itself so clean all of them out a gain after your done with the de carbon, ive found if you can suck out the dirty atf out of the rotor chamber after a couple rotations its helpful,then if ya want put in new and let soak overnight turn it over a few more times and suck it out i use the evacuator at work,should i say i err barrow it and suck it out.....

2RotorSpeed

iTrader: (1)

yeah, well my silly plan was to keep using ATF until HOPEFULLY the problem is solved, then after I put the engine in and drain the ATF, with fresh oil, run it for few minutes after its first start up then do imediatly an oil changed. then drive it for few miles, then do another oil change. at least that was my plan to remove any crap and ATF that was still in the engine.

Will that be good enough to remove that stuff?

P.S. so far I was scraping the carbon off the apex seal with a flat head screw driver (and massaging), was that a wise choice?

RotaryEvolution

iTrader: (30)

nothing like unsticking a seal than actually running the motor and doing a carb cleaner treatment on the engine.

i had an n/a car that had near 0 compression on front and rear and got it running with a little mystery oil(ATF) and did a water treatment on it(carb cleaner works better IMO) and let it cool, restarted it and ran the **** outta the engine and it came back to life.

2RotorSpeed

iTrader: (1)

ok, so now that i think of it, and my friend telling me, the one of the side seals might be bad, not the apex. When turning the engine, there are 2 good puffs out of 3 on the front rotor. rear rotor is 3/3 good puffs.

RotaryEvolution

iTrader: (30)

if you poke each apex seal it should move and not be even or recessed in the apex seal groove indicating a stuck apex seal, if they all look ok and are springy then you likely could have a stuck side seal in which case the only real methods of unsticking it are running the motor to shake it loose or do a rebuild.

2RotorSpeed

iTrader: (1)

ok, after my friend suggested, I tried some marvel mystery oil, and what the atf couldnt do in two days, this stuff did it in 20min. The side seals are now unstuck, and all 6 puffs are great. =)

Spraintz

iTrader: (1)

congrats!!

i was gonna say, I used MMO on my jspec instead of ATF and it worked much better.

good luck with the rest of it.