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Getting pistons into cylinder head - help
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Getting pistons into cylinder head - help - May 2, 2012, 08:37 PM

1973 Honda CB750 (and a bit of a 1978 Honda CB750)

I've been playing with this engine way too long!

A few months ago we cleaned up the pistons and the head, and attempted to reassemble, and failed so miserably that we gave up (got a piston ring all twisted up and stuck).

This past weekend we finally cleaned everything up again, and tonight gave it another go.

FAIL.

No, we don't have a tool to compress the piston rings, just trying to use my fingernails and losing skin in the process. I just don't want to spend the money on something I'm going to use once. I tried cut up beer cans a jubilee rings, trying to be clever. Not so clever.

Does anyone have a couple of these for me to borrow, or can someone come over and help with this part of the rebuild? And take a look at what I've got to see if it's even a worthwhile project?


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May 2, 2012, 09:04 PM



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May 2, 2012, 09:26 PM

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lol this. I was going to type it...but he already had a pic.


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May 2, 2012, 10:42 PM

^Thats an awesome idea! I hope you have a dremmel though. Makes life easier.


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May 2, 2012, 11:01 PM

Auto zone lends tools out.





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May 2, 2012, 11:27 PM

I've always compress the rings with my fingers. I've done it on several CB400s and 750s.


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May 3, 2012, 07:32 AM

A MAN Without ring compressors WTF is this world coming too....


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May 3, 2012, 08:30 AM

Quote:
Originally Posted by Scot View Post
lol this. I was going to type it...but he already had a pic.
That's pretty much what I've already tried, but the rings keep popping out just as they get to the beveled bit. Doesn't seem to be much room with these rings to slide in any further.


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May 3, 2012, 10:22 AM

Quote:
Originally Posted by CrabbyJay View Post
That's pretty much what I've already tried, but the rings keep popping out just as they get to the beveled bit. Doesn't seem to be much room with these rings to slide in any further.
Have you checked ring end gap to be sure they will in fact fit your bore?
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May 3, 2012, 10:54 AM

Quote:
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Have you checked ring end gap to be sure they will in fact fit your bore?
Good idea....I tried to ask that question (working on this with a buddy) but I didn't quite phrase it that way -- pistons were already put together and on the engine before I got home. I'll have to check on that one.


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May 3, 2012, 04:34 PM

I was at Harbour Freight today and incidentally bumped into this. Only $8.



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May 3, 2012, 04:44 PM

Hose clamps by themselves work as well. Used it on my 450. Is the bottom of the cylinders tapered? Use a little WD40, it'll help it slide in smooth (that's what she said).


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May 3, 2012, 05:55 PM

Below is a link to one way to do it if you don't have the manual.

I find that trying to insert pistons into a cylinder slowly when using a ring compressor is a PITA. Bring the cylinder down onto the pistons and then give it a sharp rap with a rubber mallet. You're looking for speed, not brute force. YMMV.

http://www.google.com/url?sa=t&rct=j...V-95arki1kuI4w


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May 6, 2012, 02:25 PM

Quote:
Originally Posted by turkishexpress View Post
I was at Harbour Freight today and incidentally bumped into this. Only $8.

Thanks -- actually bought a set of these from Sears on Thursday evening then realized they're too long for the clearance. The clamp-type will work better, if I can find them.


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May 6, 2012, 02:28 PM

Quote:
Originally Posted by w0bbles View Post
Hose clamps by themselves work as well. Used it on my 450. Is the bottom of the cylinders tapered? Use a little WD40, it'll help it slide in smooth (that's what she said).
I think I'll give this a try. The beer can edges were giving way.

First going to pull the rings off and check the gaps. Also, the cylinders do have a bevel, but a friend told me we should try to get less of an angle on that so we're going to sand that down slightly before the next try. We always pump a bunch of WD40 in. Looks like a combination of all that might do the trick. Hopefully by next weekend, so I can relax and enjoy Mother's Day


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