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Author Topic: changing main seal  (Read 1196 times)

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red_haint

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changing main seal
« on: April 10, 2007, 04:49:32 PM »
well I was pokin around the bike today dreaming of the day I fire it up, and I opted to remove the alt cover to see how much rust is on everything, as expected i'll have to wire wheel both parts of the alternator, but there was also a bit of oil in there, so I am presuming the main seal is leaking.  Now i ask, how tough is it to go thu the engine and change all the seals? I don't plan on splitting the case. 

On a funny note, there are no bolts holding the front of the engine on! :o
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Offline Jonesy

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Re: changing main seal
« Reply #1 on: April 10, 2007, 04:52:35 PM »
If you've got a CB750, there's no seal on the alternator side, so oil in there is perfectly normal.

Now if it's a 550 on the other hand.... :(
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"Every time I start thinking the world is all bad, then I start seeing people out there having a good time on motorcycles; it makes me take another look." -Steve McQueen

Offline bwaller

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Re: changing main seal
« Reply #2 on: April 10, 2007, 07:22:02 PM »
Yea well uh sorry, but like Jonesy is trying politely to tell you, if it's a 500/550 the two crank seals have a perimeter lip that fits in a groove in the crankcases so the cases need to be split for those two. The others you can sneek out and replace.

Must be a 750, huh
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Offline Jonesy

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Re: changing main seal
« Reply #3 on: April 10, 2007, 08:56:51 PM »
I didn't elaborate as I thought he had a 750, but I wasn't 100% certain and he didn't say what bike... :P
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"Every time I start thinking the world is all bad, then I start seeing people out there having a good time on motorcycles; it makes me take another look." -Steve McQueen

Offline Magpie

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Re: changing main seal
« Reply #4 on: April 10, 2007, 09:44:38 PM »
Actually there is a seal on the rotor side. It's on the large gear the starter motor drives. At least there's one on my '69/'70 motor and one shown in the parts book. It stops the oil from the end of the crankshaft coming in I suppose. Part number 91215-300-003 to be precise.
Cheers,
Cliff.
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red_haint

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Re: changing main seal
« Reply #5 on: April 11, 2007, 07:49:26 AM »
yup 750, a 78 to be precise.  Well that's a load of my mind!
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