Author Topic: 400 four main bearings - will need replacement STD bearings.  (Read 568 times)

Offline Macabethiele (Ted)

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400 four main bearings - will need replacement STD bearings.
« on: March 20, 2021, 04:46:19 PM »
I have seperated the crank case halves - I do not think it has been split before but who knows. A very thin white adhesive that pulls off easily was present. The main bearings are marked D6H-A STD.

Do these look like originals?

The crank journals on the mains look good  - they are unmarked.

Where is the best place to purchase?



.main bearing shell by Macabe Thiele, on Flickr



.rear of main shell by Macabe Thiele, on Flickr
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Offline Oddjob

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Re: 400 four main bearings - will need replacement STD bearings.
« Reply #1 on: March 20, 2021, 05:44:21 PM »
Markings mean nothing, they are just production marks.

The pic you've shown of the single bearing looks buggered, is the crank marked to the same degree?

Check the bottom edges of the bearings, sometimes you can still see the original colour they printed on there.
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Offline Bryanj

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Re: 400 four main bearings - will need replacement STD bearings.
« Reply #2 on: March 20, 2021, 06:06:48 PM »
Like ken says numbers mean nowt, you need to measure the journals VERY accurately to see what size they are andcross refer to tables in manual

Offline Macabethiele (Ted)

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Re: 400 four main bearings - will need replacement STD bearings.
« Reply #3 on: March 20, 2021, 06:28:14 PM »
So it's not a straight DS part then!
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Offline Oddjob

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Re: 400 four main bearings - will need replacement STD bearings.
« Reply #4 on: March 20, 2021, 06:48:06 PM »
No, you need to identify the colour used, there are 5 colours for the 400, black, green, brown, yellow and the 400 has a blue that most don't have.

As I previously said, see if any remnant of the old colours are still on the edge of the shell, green shows up pretty well for instance.

Check the crank journals for scoring, with the state of that bearing I'd be worried about the journals, run a fingernail across it and see if you can feel anything.
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Offline Macabethiele (Ted)

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Re: 400 four main bearings - will need replacement STD bearings.
« Reply #5 on: March 20, 2021, 08:39:46 PM »
No, you need to identify the colour used, there are 5 colours for the 400, black, green, brown, yellow and the 400 has a blue that most don't have.

As I previously said, see if any remnant of the old colours are still on the edge of the shell, green shows up pretty well for instance.

Check the crank journals for scoring, with the state of that bearing I'd be worried about the journals, run a fingernail across it and see if you can feel anything.
The journals look perfect IMHO not a groove or anything. No step with fingernail. Be dammed if I can see any colour codes I will look again with a light & magnifying glass. Are the big ends the same where STD does not mean anything?
« Last Edit: March 20, 2021, 10:51:53 PM by Macabethiele (Ted) »
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Offline Oddjob

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Re: 400 four main bearings - will need replacement STD bearings.
« Reply #6 on: March 20, 2021, 09:41:13 PM »
Yeah, same system as the mains.
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Offline Bryanj

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Re: 400 four main bearings - will need replacement STD bearings.
« Reply #7 on: March 20, 2021, 10:12:07 PM »
Big ends may be ok, that damage could be dirty oil infrequently changed but who knows

Offline Macabethiele (Ted)

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Re: 400 four main bearings - will need replacement STD bearings.
« Reply #8 on: March 20, 2021, 10:55:09 PM »
Looking at the DS site conrod bearings look more available than the mains that are shown as no longer available.

What do you do if they are not available surely someone must make them even if you have to have a crank grind in the process?
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Offline Nurse Julie

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Re: 400 four main bearings - will need replacement STD bearings.
« Reply #9 on: March 21, 2021, 08:02:58 AM »
Buy the shells from Yamiya Ted if you can't find them locally. You don't have cranks ground on these engines just to make shells fit. This isn't a Ford Anglia 😁😁😁
Im a Nurse, trust me, this won't hurt.....much !!!

LINK TO MY CB400/4 ENGINE STRIP / ASSESSMENT AND REBUILD...NOW COMPLETE
http://www.sohc.co.uk/index.php/topic,14049.msg112691/topicseen.html#new

Offline Macabethiele (Ted)

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Re: 400 four main bearings - will need replacement STD bearings.
« Reply #10 on: March 21, 2021, 09:10:54 AM »
Buy the shells from Yamiya Ted if you can't find them locally. You don't have cranks ground on these engines just to make shells fit. This isn't a Ford Anglia 😁😁😁

PS What's a Ford Anglia is it like  Ford Prefect.
Okay that is good to hear at first glance I can't see any colour markings - I'm not sure if the colour is on the back or the edge of the shells. If I can't find any markings will my caliper tool  be accurate enough or will I need to get them micrometer checked? I've printed of the parts page it only seems to give clearance sizes. There's me thinking STD on a shell meant standard size!
PS A Ford Anglia? Are they a later version of the Ford Prefect😁😁
« Last Edit: March 21, 2021, 09:14:55 AM by Macabethiele (Ted) »
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Offline Bryanj

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Re: 400 four main bearings - will need replacement STD bearings.
« Reply #11 on: March 21, 2021, 10:00:03 AM »
You need to be able to measure accurately to at least 2 decimal places in metric(0.01mm=0.4thou) so not within verineer acuracy im afraid. May be cheaper to get in done by somebody used to micrometers as the acuracy "feel" is an aquired art

Offline Macabethiele (Ted)

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Re: 400 four main bearings - will need replacement STD bearings.
« Reply #12 on: March 21, 2021, 10:13:07 AM »
You need to be able to measure accurately to at least 2 decimal places in metric(0.01mm=0.4thou) so not within verineer acuracy im afraid. May be cheaper to get in done by somebody used to micrometers as the acuracy "feel" is an aquired art
I agree back in the day depending how hard I tightened the screw changed any measurement.
« Last Edit: March 21, 2021, 10:23:06 AM by Macabethiele (Ted) »
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Offline Bryanj

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Re: 400 four main bearings - will need replacement STD bearings.
« Reply #13 on: March 21, 2021, 11:00:37 AM »
Yup, even with the little ratchet that is supposed to limit the movement

Offline Oddjob

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Re: 400 four main bearings - will need replacement STD bearings.
« Reply #14 on: March 21, 2021, 11:40:40 AM »
TED CMS still sell most of the main bearings, I was wrong as well, there appears to be a Red bearing as well, no blues or blacks but do have Brown, Green and Red. Brown and Green are the most common colours. Click on a bearing and you can see the colours on the edge of the bearing so you know where to look.

https://www.cmsnl.com/honda-cb400f-england_model14639/partslist/E01.html#.YFcwHVX7SUn

No 42 for mains, No 40 for conrods.
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