Stuck Apex Seal
12-12-08, 09:36 PM
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Stuck Apex Seal
Alright so heres the story. I flooded my engine all to hell.. Turned it backwards with the trailing plug out and a ton of gas came out of the rear rotor.. I put oil in the plug holes and crank it over for 10 seconds.. then go to start it.. Doesn't start.. Check compression.. compression is fine on all 6 faces..
Put more oil in the plug holes and try to start it again.. And after a few repeats of this process I can hear 2 faces aren't getting good compression. Pull the plug on the rear rotor and sure enough 2 faces aren't getting good compression.
Now I pull the exhaust manifold off and turn the engine over to the point where the bad apex is accessible from the exhaust port.. And it feels intact (from what I can feel from the exhaust port opening).. Only thing is it doesn't budge if I put pressure on it (and I know it should have some give because I just walked over to another short block engine I have and did the same thing and I got about a half mm of give when I pushed on the seal).. I'm kinda thinking its just stuck but I want a second opinion about it before I go pull the motor.. I was going to put it all back together and start the thing.. Rev it to 3000 for a minute and hope it unsticks (if it is a stuck seal and not cracked).
What do you guys think?
Thanks
Put more oil in the plug holes and try to start it again.. And after a few repeats of this process I can hear 2 faces aren't getting good compression. Pull the plug on the rear rotor and sure enough 2 faces aren't getting good compression.
Now I pull the exhaust manifold off and turn the engine over to the point where the bad apex is accessible from the exhaust port.. And it feels intact (from what I can feel from the exhaust port opening).. Only thing is it doesn't budge if I put pressure on it (and I know it should have some give because I just walked over to another short block engine I have and did the same thing and I got about a half mm of give when I pushed on the seal).. I'm kinda thinking its just stuck but I want a second opinion about it before I go pull the motor.. I was going to put it all back together and start the thing.. Rev it to 3000 for a minute and hope it unsticks (if it is a stuck seal and not cracked).
What do you guys think?
Thanks
12-13-08, 10:45 AM
#2
Engine, Not Motor
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If you can get at the exhaust ports, spray a bit of carb cleaner on the stuck seal and let it set for a day or two. Keep it wet with the cleaner.
It's very unusual for a seal to just randomly stick after a flooding incident. Does the bad seal feel sharp at all? If so, then the top piece may have rolled out and jammed.
It's very unusual for a seal to just randomly stick after a flooding incident. Does the bad seal feel sharp at all? If so, then the top piece may have rolled out and jammed.
12-13-08, 11:02 AM
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No it doesn't have the sharp angled edge that the bottom half of the apex seal has... (that was originally my concern).. I might have put too much oil in the last time I tried to deflood it but I'm not quite sure how that would affect it. I will try the carb cleaner though..
Do you think that starting it up and reving it for a minute, or just driving it, will unstick the seal via centrifugal force?
Thanks
Do you think that starting it up and reving it for a minute, or just driving it, will unstick the seal via centrifugal force?
Thanks
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