Author Topic: 1976 CB550F1 (what have I let myself in for) Project  (Read 31125 times)

Offline eight0

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Re: 1976 CB550F1 (what have I let myself in for) Project
« Reply #105 on: January 07, 2021, 09:35:27 AM »
Ok thanks again for the advice oddjob. If the ones next to the rotor are brown (1 and 2), strange you cant see the colour on them but that bearings 3-5 do look brown!

Bearings are coming out at £142 on CMSNL. Any other cheaper sources you know of before I take the plunge? DSS only has greens and are a similar price anyway.

Thanks for the advice and putting up with all the Crankshaft pics!

Do the rod bearings look ok?
« Last Edit: January 07, 2021, 11:59:39 AM by eight0 »

Offline eight0

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Re: 1976 CB550F1 (what have I let myself in for) Project
« Reply #106 on: January 07, 2021, 04:34:36 PM »
Oh man, ok. All rods are E2.

 

Offline eight0

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Re: 1976 CB550F1 (what have I let myself in for) Project
« Reply #107 on: January 07, 2021, 08:37:16 PM »
Actually the colour is clearly visible on the rod bearings. All brown. Do you think I should order 8 then or just 4?

Offline eight0

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Re: 1976 CB550F1 (what have I let myself in for) Project
« Reply #108 on: January 08, 2021, 09:00:43 AM »
Hey, some people like to collect penny blacks, others, black bearing shells.  ;D

OK, I've ordered 8 brown rod bearings, 4 brown and 6 green crank bearings. I imagine they will take some time to arrive..

Thanks for all the advice oddjob.
« Last Edit: January 08, 2021, 09:03:18 AM by eight0 »

Offline eight0

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Re: 1976 CB550F1 (what have I let myself in for) Project
« Reply #109 on: February 09, 2021, 05:57:23 PM »
So I've finally got the bearings I ordered.
Actually I got double the order as cms took weeks and it didn't look like it was going to happen so I cancelled the order and ordered for more money from DS. Both ordered turned up within a day of eachother! Ah well, I can send one back.

Unbelievably, having now taken the old bearings out of the cases, they are clearly ALL browns. The case markings are BBAAA so if as oddjob says, the A's must be either green or yellow, someone must have had this engine open before and installed all browns.

What should I do! If I open both orders from CMS and DS to check tolerances with both green/brown and all brown I can't return the bearings.

Does make me wonder whether the rods which had all browns were right either.

Offline eight0

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Re: 1976 CB550F1 (what have I let myself in for) Project
« Reply #110 on: February 09, 2021, 07:13:13 PM »
Well, I have just put the old bearings in and 2 of the new brown bearings on 5 and 6 where the greens are supposed to be.

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Not great.

Also I have just noticed this.

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Feeling a little deflated.

Offline Bryanj

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Re: 1976 CB550F1 (what have I let myself in for) Project
« Reply #111 on: February 09, 2021, 08:23:07 PM »
The main i would live with but the big end is junk

Offline eight0

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Re: 1976 CB550F1 (what have I let myself in for) Project
« Reply #112 on: February 09, 2021, 08:24:55 PM »
What are my options

Offline Johnny4428

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Re: 1976 CB550F1 (what have I let myself in for) Project
« Reply #113 on: February 09, 2021, 09:10:03 PM »
Feel your pain eight0, is that also pitting where the crankshaft seal sits? Wish I could give you something positive.
1952 Cymoto on Triumph bicycle.
1961 Matchless G3
1974 Honda CB550K1. Running resto,
1978 Honda CB550K3.
1999 ST1100 Pan European 50th Anniversary.
1975,1980,1984,1986 Honda C90’s
1973 Honda CB750K3

Offline Bryanj

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Re: 1976 CB550F1 (what have I let myself in for) Project
« Reply #114 on: February 10, 2021, 12:28:31 AM »
Only option is different crank. 500 and 550 are the same so should be a few out there, dont think i got a spare as too many projects

Offline eight0

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Re: 1976 CB550F1 (what have I let myself in for) Project
« Reply #115 on: February 10, 2021, 09:50:48 AM »
well, the condition of the engine lives up to the threads title I guess.

I've ordered another crank from DK which also has the rods with it. You never know, the bearings on those rods might be re-usable.

Without sending the cases and crank to a machine shop to get measures for clearance, my plan is to put all the old brown bearings in to see how off they are using plasitguage and go from there.




Offline Trigger

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Re: 1976 CB550F1 (what have I let myself in for) Project
« Reply #116 on: February 10, 2021, 01:17:47 PM »
You can not go by crank markings. The Honda Manuel is reference to new parts only and not to something that has done 50,000 to 80,000 miles with wear and tear  ;) 

Offline eight0

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Re: 1976 CB550F1 (what have I let myself in for) Project
« Reply #117 on: February 11, 2021, 02:59:08 PM »
The 'new' crank arrived. Much easier to see the markings.

From left to right. 21112

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My case is BBAAA so with the new crank it should be brown, green, yellow, yellow, green. 

I put the crank in with all the old brown bearings and the plasitgauge measured .51 .51 .51 .38 .51

I put a new brown bearing on just to see if there is much difference.

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Maybe I'm best off just installing browns all round. What do you think?



Offline eight0

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Re: 1976 CB550F1 (what have I let myself in for) Project
« Reply #118 on: February 11, 2021, 05:37:34 PM »
Thanks Ken, that might work if you have that many yellows!

No, not corrosion, just some dirt. I hadn't cleaned it yet when I took those pics.

Yeah rod bearings all need replacing.

They are all marked 1 on the rod and BAAA on the crank so I make that green, and 3x yellow.

I bought all browns!


Offline Bryanj

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Re: 1976 CB550F1 (what have I let myself in for) Project
« Reply #119 on: February 12, 2021, 12:58:00 PM »
Thats cos people like me just fitted black shells and ran the in carefull Ken

 

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