12A Side Seals
#1
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12A Side Seals
Guys:
I am at a point where I am not sure what to do. I have a rear rotor for a 12A with stuck side seals. I have tried soaking in carb cleaner, heating, beating, etc and cannot get the side seals removed... I am totally frustrated with this rotor.
Can anyone please help with suggestions? I have to get that 12A rebuilt. It's been in pieces for way too long!
The engine came from a 1980. If I get another set of rotors from a 79 or 80 can I just drop them in? Anyone have a set?
Thanks
I am at a point where I am not sure what to do. I have a rear rotor for a 12A with stuck side seals. I have tried soaking in carb cleaner, heating, beating, etc and cannot get the side seals removed... I am totally frustrated with this rotor.
Can anyone please help with suggestions? I have to get that 12A rebuilt. It's been in pieces for way too long!
The engine came from a 1980. If I get another set of rotors from a 79 or 80 can I just drop them in? Anyone have a set?
Thanks
#2
1st-Class Engine Janitor
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Try oven cleaner - it dissolves carbon by design. Wear gloves and goggles, as it's fairly caustic. Works best hot, usually; follow instructions on the can.
If that won't do it, you're better off replacing it.
You want rotors to be matched-weight pairs to maintain balance.
If that won't do it, you're better off replacing it.
You want rotors to be matched-weight pairs to maintain balance.
#3
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there are many ways to go at it.
1. try soaking in other things (DD's oven cleaner idea is a great one)
2. find something strong and thin enough to go at them from the corner seal slots ... maybe notch an old side seal and use it as a pick.
3. i once went as far as putting rotor in the freezer overnight. you can try that.
1. try soaking in other things (DD's oven cleaner idea is a great one)
2. find something strong and thin enough to go at them from the corner seal slots ... maybe notch an old side seal and use it as a pick.
3. i once went as far as putting rotor in the freezer overnight. you can try that.
#4
84SE-EGI helpy-helperton
PB Blaster has a nice peppermint scent and I haven't found a stuck metal to metal problem yet that it hasn't done well with. Definitely try that before you get medieval on it.
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the 76-82 rotors are the same. easy ID, they are stamped either F or R, for front or rear. the 83-85 are FN or RN
#6
heynoman
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I recall a slight difference in the pre 80's and post 80's non "N" rotors . The compression ratio on both are the same but the compression chambers on the rotors have a slightly different shape. I don't know if it affects weight but would I definitely avoid using one of each.
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I have tried PB blaster, carb cleaner (soaking B-12 now), beating using a sheet rock spatula in the groove, WD-40...
I'll try freezing and oven cleaner.
Thanks
Oh, and I do have another set of rotors. I thought they were 83-84 but they are stamped F and R. I can use those OK with all other 80 parts? Same counter weight and all?
I'll try freezing and oven cleaner.
Thanks
Oh, and I do have another set of rotors. I thought they were 83-84 but they are stamped F and R. I can use those OK with all other 80 parts? Same counter weight and all?
Last edited by 350xfire; 11-11-15 at 10:10 AM.
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#8
heynoman
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I use a small flat head screwdriver thru the corner seal slots . The thinner ones that are for eye glasses they fits inside of the side seal groove. Stick it under the seal and pry it up the seal will break and you can work it out one piece at a time. Be careful not to damage the groove . You can also try to break off a piece of the seal on both ends and grab on to the side seal spring with pliers on both end and pull up. Sometime it gets it free sometime the spring just breaks but it's worth a shot plus if you get the spring out of there it give you a little more room to wedge under the seal itself.
#9
Lapping = Fapping
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I use a blade from a box cutter. You have to break it into a smaller length. The slanted end and get down under the side seal and the broken off straight end can be tapped with a really small hammer. Works great to get extremely stuck side seals out due to rust and/or carbon that have already gotten broken using other methods. Also WD40 tends to help.
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ok, so it looks like the set of rotors for the 82-83 is good. Can I use those as a pair with all of the 1980 parts?
I've tried the screw driver and all tricks except ATF. This things are really stuck!
I've tried the screw driver and all tricks except ATF. This things are really stuck!
#21
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2. 82-83 should not be a set because they are of different vintage. so unless that's a typo, you should double-check what you have. 82 rotors belong to the older vintage (76-82) and then of course there is 83-85.
#22
heynoman
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I think In a previous post he states he really doesn't know what year they are from but are definitely not 83-85 "N" rotors so definitely 76-82 rotors. What year exactly? Who really knows?
What weight stamp is on the good rotors and what weight stamp the rotors with the stick seals? . Also if you have a scale you could even get away with changing around just one rotor. But like I stated in a previous post I'm pretty sure there was more then one casting for the earlier rotors . So make sure the combustion chambers are the same.
What weight stamp is on the good rotors and what weight stamp the rotors with the stick seals? . Also if you have a scale you could even get away with changing around just one rotor. But like I stated in a previous post I'm pretty sure there was more then one casting for the earlier rotors . So make sure the combustion chambers are the same.
Last edited by heynoman; 11-13-15 at 09:32 PM.