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Author Topic: First engine tear-down---the surprises within!  (Read 1708 times)

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Offline jreich

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First engine tear-down---the surprises within!
« on: January 31, 2007, 03:32:43 PM »



Just tore into my first motorcycle engine, a '78 cb550, and what fun I am having! Been a terribly good learning experience thus far (terribly in the nicest sense!)

Thought you all might get a kick out of the surprises that were in store for me... :o

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Offline TwoTired

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Re: First engine tear-down---the surprises within!
« Reply #1 on: January 31, 2007, 04:14:54 PM »
Okay, you have a wet #2 cylinder.  Do you know why?
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Lloyd... (SOHC4 #11 Original Mail List)
72 500, 74 550, 75 550K, 75 550F, 76 550F, 77 550F X2, 78 550K, 77 750F X2, 78 750F, 79CX500, 85 700SC, GL1100

Those that learn from history are doomed to repeat it by those that don't learn from history.

Offline jreich

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Re: First engine tear-down---the surprises within!
« Reply #2 on: January 31, 2007, 04:50:20 PM »
I don't know why...it does have quite a strong gas smell

Both #2 and #3 are stuck, while the others are not.

I've got those two soaking with liquid wrench now

Why is #2 wet?

Thanks!
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Offline TwoTired

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Re: First engine tear-down---the surprises within!
« Reply #3 on: January 31, 2007, 06:09:27 PM »
You mean #2&3 pistons won't move?  I guess you have the engine out of the frame, so you can't use the rear wheel to rock the crankshaft back & forth.  :(

If the wet stuff is gas, it should evaporate and become dry fairly soon.  If it is oil it will stay wet a long time.   What do the cylinder walls look like? Is the head chamber wet, too?  Do you have a blow torch?

There is probably a historical reason why the cylinder is wet.  Got any history?

Cheers,
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Lloyd... (SOHC4 #11 Original Mail List)
72 500, 74 550, 75 550K, 75 550F, 76 550F, 77 550F X2, 78 550K, 77 750F X2, 78 750F, 79CX500, 85 700SC, GL1100

Those that learn from history are doomed to repeat it by those that don't learn from history.

Offline jreich

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Re: First engine tear-down---the surprises within!
« Reply #4 on: January 31, 2007, 06:42:58 PM »
Yeah, 2 and 3 are pretty seized up.

The cylinder walls look pretty clean, from what I can currently see on 1 and 4, and what is visible on 2 and 3

Unfortunately, I don't have much of a history. I got the engine free from a buddy who was tearing down a bike that had been sitting in a garage for some time, and am using it as something to practice on and learn from.

« Last Edit: January 31, 2007, 07:04:25 PM by jreich »
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