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Author Topic: Honda CB400F crankshaft endplay  (Read 1549 times)

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Offline everm1nd

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Honda CB400F crankshaft endplay
« on: June 17, 2012, 02:17:43 PM »
I noticed some knocking in bottom of engine and decided to disassemble it for revision. There is lengthwise crankshaft endplay about 1 or ever 2 millimeters. I don't find something about it in manual. In other (new) CB we don't find any endplay at all. Crankshaft fits perfectly. I don't understand where it comes from, because there is almost no any wearout. Seems like crankshaft endplay is a reason of knocking. Have you any ideas how I can fix it?
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Offline camelman

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Re: Honda CB400F crankshaft endplay
« Reply #1 on: June 17, 2012, 09:35:13 PM »
Please describe your question better. Is the endplay at the end of the connecting rod to the piston, or elsewhere?  There should be a little play at the connecting rod on the crankshaft. I don't know the exact amount, but maybe 0.5 mm play sliding forward and backward along the crankshaft. There should be no play when you push or pull on the connecting rod.
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1972 350f rider: sold
1972 350f/466f cafe: for sale
1977 CB400f cafe:sold
1975 CB400f rider: sold
1970 CB750 K0 complete bike: sold
2005 Triumph Sprint ST 1050 rider

We've got to cut it off... and then come down on rockets.  (quoted from: seven minutes of terror)

Offline everm1nd

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Re: Honda CB400F crankshaft endplay
« Reply #2 on: June 18, 2012, 04:44:15 PM »
When I pull crankshaft from left to right holding at clutch there is some play. About 1 or 2 milimeters.
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Offline LesterPiglet

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Re: Honda CB400F crankshaft endplay
« Reply #3 on: June 18, 2012, 05:25:52 PM »
But your clutch isn't on the end of your crankshaft.
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'Then' and 'than' are completely different words and have completely different meanings. Same with 'of' and 'have'. Set and sit. There, their and they're. Draw and drawer. Could care less/couldn't care less. Bought/brought FFS.


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Offline camelman

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Re: Honda CB400F crankshaft endplay
« Reply #4 on: June 18, 2012, 05:31:22 PM »
I think we need pictures to understand your question.
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1972 350f rider: sold
1972 350f/466f cafe: for sale
1977 CB400f cafe:sold
1975 CB400f rider: sold
1970 CB750 K0 complete bike: sold
2005 Triumph Sprint ST 1050 rider

We've got to cut it off... and then come down on rockets.  (quoted from: seven minutes of terror)

Offline everm1nd

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Re: Honda CB400F crankshaft endplay
« Reply #5 on: June 19, 2012, 03:53:35 AM »
Oh, that's not clutch, year! Sorry, I don't know how it names in english.
I made a short video. There is no link coz i can't insert it. Just copy and paste it in your address line:
youtu.be/0Pv_uLES6DI
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Offline LesterPiglet

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Re: Honda CB400F crankshaft endplay
« Reply #6 on: June 19, 2012, 04:04:00 AM »
I'm no expert at this but have you tried putting the top crankcase on and see if it does the same?
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'Then' and 'than' are completely different words and have completely different meanings. Same with 'of' and 'have'. Set and sit. There, their and they're. Draw and drawer. Could care less/couldn't care less. Bought/brought FFS.


Les Ross.            Certified by a Professional

Offline yesteryear

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Re: Honda CB400F crankshaft endplay
« Reply #7 on: June 19, 2012, 05:39:52 AM »
Hi.
My 750 did that don't remember how much but when you re install the top case, cylinders,alternator and points seal mine did not do that any more.Done over 300 miles now no problems.Like I say mines OK don't know about yours.
Hope this helps
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Offline everm1nd

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Re: Honda CB400F crankshaft endplay
« Reply #8 on: June 19, 2012, 06:14:49 AM »
As I remember, there was some play with top cover, but may be it played less. I'm going to assemble it tomorrow, hoping that play will go away.
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Offline yesteryear

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Re: Honda CB400F crankshaft endplay
« Reply #9 on: June 19, 2012, 07:37:46 AM »
Forgot to mention I did fit new Honda main bearing shells.
Regards
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Offline everm1nd

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Re: Honda CB400F crankshaft endplay
« Reply #10 on: June 19, 2012, 08:45:12 AM »
Thanks for advice, but I'm going to change bearings this winter. I also have some troubles in cylinders head, so this will be big job.
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