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Post by mxmatt on Apr 23, 2014 9:45:33 GMT -6
Just ordered my new starter clutch and gasket kit on eBay. I figure since I am going in to replace the clutch, I may as well do a complete engine rebuild, AGAIN!  I have my "Red RTV" sealant (thanks Bashan), but I still need to order my crankcase oil seals. However, I am not sure what size to order or how many. Could one of you big boys give me some suggestions? My motor is a Lifan 1P57QMJ with a Scrappydog Scooters crankshaft installed in February 2014. There seems to be a few different sizes and diameters for the seals and I am trying to learn which size I need for my motor. Thanks in advance for your "know how." |
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Clinician
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Post by carefulrider on Apr 23, 2014 11:17:07 GMT -6
According to my information the original ENGINE CRANKSHAFT oil seal is 19.8*30*5. Yours might be different as it was changed. If the Oil seal is bad, then crankcase separation is required. A lot of work.
If the oil leak is coming from inside the drive cover, behind the variator, you have a crank seal leak which would be costly, in time, to fix.
I'd let those who know more than I do, confirm this, however, before taking any action. So wait for additional replies.
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Post by mxmatt on Apr 23, 2014 20:48:04 GMT -6
According to my information the original ENGINE CRANKSHAFT oil seal is 19.8*30*5. Yours might be different as it was changed. If the Oil seal is bad, then crankcase separation is required. A lot of work.
If the oil leak is coming from inside the drive cover, behind the variator, you have a crank seal leak which would be costly, in time, to fix.
I'd let those who know more than I do, confirm this, however, before taking any action. So wait for additional replies.
Thanks for the info. I'm aware of the labor intensive undertaking I'm headed for. Fortunately it's a case of "been there, done that" for me. I figure so long as I'm in there I might as well change them out since the bike is a 2008 and they are the origional seals. |
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Post by Bashan on Apr 23, 2014 22:19:20 GMT -6
Alley is the oil seal expert, I will defer to him. Heeeeeere's ALLEY! 
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Post by Alleyoop on Apr 23, 2014 22:36:38 GMT -6
You have TWO crank oil seals 1 is behind the VARIATOR easy as pie to change 19.8*30*5.
The other one is behind the plate you will be taking off to replace your starter clutch NO CRANKCASE SPLITTING IS REQUIRED.
Alleyoop
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Post by tvnacman on Apr 24, 2014 4:51:40 GMT -6
I have not done it , but I hear the sesls can be changed without splitting the case
John
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Post by Bashan on Apr 24, 2014 7:36:07 GMT -6
I swear John, you are just slightly out of temporal phase. I use red RTV. Be conservative with it, too much and it breaks off and gets hopefully caught in the filter screen. After the build, make sure you change the oil out and clean the screen after just a few runs. Rich
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Post by Alleyoop on Apr 24, 2014 12:37:57 GMT -6
Freaking guys, here are the crank seals GEEZZZZZZZZZZ. Alleyoop Right Side Crank Seal is behind the PLATE that holds the Stator:  Left Side Crank Seal is behind the Variator:  |
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Post by mxmatt on Apr 24, 2014 13:26:30 GMT -6
You have TWO crank oil seals 1 is behind the VARIATOR easy as pie to change 19.8*30*5. The other one is behind the plate you will be taking off to replace your starter clutch NO CRANKCASE SPLITTING IS REQUIRED. Alleyoop Not required unless you're the idiot who used clear RTV when replacing the crank and now have a bad oil leak.  |
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Post by Alleyoop on Apr 24, 2014 14:02:54 GMT -6
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Post by jvino on Apr 25, 2014 9:27:02 GMT -6
Keep us posted I would think your going to replace your engine fixed soon and all apart. It's a real stinker that you have to do it again. At least this time you will have to say your a perfesional after hours of putting it back together.
Matt you seem to be in good spirts about it and hope you get it all right this time. Couple of difrent ways of going about it with red rvt sealant. I am hopping to hear you have your scooter running well soon. Are you replacing everything again crank piston rings? Or are you just replacing the seals on the engine?
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Post by mxmatt on Apr 25, 2014 22:17:13 GMT -6
Keep us posted I would think your going to replace your engine fixed soon and all apart. It's a real stinker that you have to do it again. At least this time you will have to say your a perfesional after hours of putting it back together. Matt you seem to be in good spirts about it and hope you get it all right this time. Couple of difrent ways of going about it with red rvt sealant. I am hopping to hear you have your scooter running well soon. Are you replacing everything again crank piston rings? Or are you just replacing the seals on the engine? Jvino, thanks for being interested. Yes, I am going to do a full tear down rebuild of my whole scooter. I never did an origional PDI since it was purchased used and I didn't know about that then. I'm not happy about having to do it, but I'm looking forward to the experience. I'll create another thread to show my journey. I'm not replacing the crank, piston and rings since I just did that in February. |
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Post by jvino on Apr 26, 2014 8:45:56 GMT -6
Well matt hope it works out good for you. Sorry again you cant enjoy your scooter riding but your doing the nessary things to keep it running a long time. I hope it works out this time for you. With the oil leaking as bad as you said it was leaking the air and dirt your sucking in your engine could really damage it.
You are making a good decision I believe in replacing the seals. It will help with the long lasting and many miles of enjoyment put on your scooter.
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Post by mxmatt on May 14, 2014 13:51:13 GMT -6
Could one of you Scooter Know-It-All's tell me if I need to put anything on my crank case seal before installing it. Do I lube it with something or use a product between the case and seal?
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Post by Alleyoop on May 14, 2014 14:09:43 GMT -6
Nothing just slip it in there, but there are no NO-IT-ALLS we just guess at this stuff and cross our fingers and toes that it works???   Alleyoop |
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I have my "Red RTV" sealant (thanks Bashan), but I still need to order my crankcase oil seals. However, I am not sure what size to order or how many. Could one of you big boys give me some suggestions? My motor is a Lifan 1P57QMJ with a Scrappydog Scooters crankshaft installed in February 2014. There seems to be a few different sizes and diameters for the seals and I am trying to learn which size I need for my motor. Thanks in advance for your "know how."
? And again at 2033mi. 
..BAD TO THE BONE..
