Author Topic: CB400/4 ENGINE STRIP, ASSESSMENT AND REBUILD BY JULIE - NOW COMPLETE  (Read 48439 times)

Offline mike the bike

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Re: CB400/4 ENGINE STRIP, ASSESSMENT AND REBUILD BY JULIE
« Reply #135 on: October 12, 2017, 04:59:09 PM »
I was thinking the same;  how on earth did those shagged pistons drag Julie to Crich and back.
Where's that 10mm socket got to?

Offline Nurse Julie

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Re: CB400/4 ENGINE STRIP, ASSESSMENT AND REBUILD BY JULIE
« Reply #136 on: October 12, 2017, 05:08:50 PM »
Those shagged pistons have dragged me around for almost 5000 Mike !!!!. Anyway, I'm a true biker at heart, I'm not going to let something like knackered pistons stop me. Don't forget I'm into Brit bikes so I'm used to having bits fall apart, blow up and stop working ;D ;D ;D
« Last Edit: October 12, 2017, 05:11:21 PM by Nurse Julie »
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Offline JamesH

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Re: CB400/4 ENGINE STRIP, ASSESSMENT AND REBUILD BY JULIE
« Reply #137 on: October 12, 2017, 05:59:51 PM »
Just imagine how lovely the 400 is going to be once you've sorted the engine Julie...!!

Offline Nurse Julie

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Re: CB400/4 ENGINE STRIP, ASSESSMENT AND REBUILD BY JULIE
« Reply #138 on: October 12, 2017, 06:58:06 PM »
Just imagine how lovely the 400 is going to be once you've sorted the engine Julie...!!
Yes James, she will be lovely.
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LINK TO MY CB400/4 ENGINE STRIP / ASSESSMENT AND REBUILD...NOW COMPLETE
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Offline Nurse Julie

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Re: CB400/4 ENGINE STRIP, ASSESSMENT AND REBUILD BY JULIE
« Reply #139 on: October 12, 2017, 07:16:05 PM »
Managed to get the mullered head stud out today. As Mike the Bike noticed previously, it was well corroded in. We used Ian's (Orcadian) way he mentioned earlier. We clamped the stud in the vice, still attached to the casing, applied plenty of diffused heat and turned the casing on the stud. It took some doing though, plenty of WD40 helped. When it started moving we put it on the bench and got mole grips on it, with more WD40 and eventually it came out.

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Now, a question i cannot find the answer to in either the Workshop Manual or Haynes. I know on the CB750's, oil comes up two of the head studs, the centre rears. Does this happen on the CB400's as well?. Not necessarily the centre rears but the two end studs on this engine were not corroded in and came out very easily when I was investigating. I have looked at the oil flow diagram but can't see for sure if this happens or not. Any insight much appreciated.
LINK TO MY EBAY PAGE. As many of you know already, I give 10% discount and do post at cost to forum members if you PM me direct.
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LINK TO MY CB400/4 ENGINE STRIP / ASSESSMENT AND REBUILD...NOW COMPLETE
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Offline Orcade-Ian

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Re: CB400/4 ENGINE STRIP, ASSESSMENT AND REBUILD BY JULIE
« Reply #140 on: October 12, 2017, 08:40:57 PM »
Hi Julie,
I'm really enjoying your regular updates and having just done my spare 400/4 I'll willingly accept the subliminal bollocking I got from you for not sharing this with the forum!  Although I have written many pages on my site with bike and car rebuilds and quite a few articles in Tansha and Jaguar mags, I seem to have lost the enthusiasm for recording all this stuff - although I've taken lots of pics just in case.  Might be the fact that I'm 69 next birthday and if life were just one day long, then it's nearly 23.00 hours!
Your thread has really hit the spot with old hands and newbies alike, so keep up the good work!
Very pleased that you had success with the slightly unorthodox method of stud removal - it's worked many times for me.
Many years ago I bought a knackered old BSA 150 Bantam which kind of ran but wouldn't pull when you tried letting the clutch out.  Only when I stripped the engine did I find there were NO piston rings in it - so I'm not really surprised that your bike actually ran.
On the oil up the studs question, doesn't it go up the two outer ones with those rubber seals between the barrels and head?

Ian

Offline kevski

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Re: CB400/4 ENGINE STRIP, ASSESSMENT AND REBUILD BY JULIE
« Reply #141 on: October 12, 2017, 09:01:10 PM »


Now, a question i cannot find the answer to in either the Workshop Manual or Haynes. I know on the CB750's, oil comes up two of the head studs, the centre rears. Does this happen on the CB400's as well?. Not necessarily the centre rears but the two end studs on this engine were not corroded in and came out very easily when I was investigating. I have looked at the oil flow diagram but can't see for sure if this happens or not. Any insight much appreciated.
[/quote]

just look down the stud holes for drillings going off at angles, if they have the answer is yes

Offline Nurse Julie

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Re: CB400/4 ENGINE STRIP, ASSESSMENT AND REBUILD BY JULIE
« Reply #142 on: October 12, 2017, 09:04:17 PM »
Thanks Ian, I'm pleased you are enjoying reading about my tinkerings, I'm really enjoying the hands on work and sharing it with others, it's good fun.
You have confirmed my suspicions that the oil goes up the two outer head studs, that's why they were nice and free as the oil coming up the thread has stopped any corrosion setting in !!!.
Edit....Yes, I did mutter a bollocking directed at yourself for not sharing your rebuild but I can understand why you didn't  :) :) :)
« Last Edit: October 12, 2017, 09:10:38 PM by Nurse Julie »
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LINK TO MY CB400/4 ENGINE STRIP / ASSESSMENT AND REBUILD...NOW COMPLETE
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Offline Nurse Julie

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Re: CB400/4 ENGINE STRIP, ASSESSMENT AND REBUILD BY JULIE
« Reply #143 on: October 12, 2017, 10:50:10 PM »
I'm used to having bits fall apart, blow up and stop working ;D ;D ;D

Is this a dig at Graham I wonder??  :) :)
;D ;D ;D ;D ;D
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LINK TO MY CB400/4 ENGINE STRIP / ASSESSMENT AND REBUILD...NOW COMPLETE
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Offline Bryanj

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Re: CB400/4 ENGINE STRIP, ASSESSMENT AND REBUILD BY JULIE
« Reply #144 on: October 13, 2017, 02:00:33 PM »
Where do the restrictors fit on the 400. been so long I cant remember, 500,s are in the base dowels

Offline Nurse Julie

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Re: CB400/4 ENGINE STRIP, ASSESSMENT AND REBUILD BY JULIE
« Reply #145 on: October 13, 2017, 02:03:22 PM »
Where do the restrictors fit on the 400. been so long I cant remember, 500,s are in the base dowels
They fit right at the end of the barrels to head Bryan. Marked in green
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« Last Edit: October 13, 2017, 02:08:26 PM by Nurse Julie »
LINK TO MY EBAY PAGE. As many of you know already, I give 10% discount and do post at cost to forum members if you PM me direct.
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LINK TO MY CB400/4 ENGINE STRIP / ASSESSMENT AND REBUILD...NOW COMPLETE
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Offline Bryanj

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Re: CB400/4 ENGINE STRIP, ASSESSMENT AND REBUILD BY JULIE
« Reply #146 on: October 13, 2017, 02:39:06 PM »
Are there equivalent holes at the base gasket or are the holes drilled at an angle into a stud hole, isn't clear on base gasket pic. EDIT

Looking at the Motogrid parts list there are dowels in the base gasket at the outsides and I suspect the oil feed is upwards through those then restricted at the head gasket, what I cant see is if there are any O rings at he base joint.
This would mean the oval holes at the studs are for drain down.

It does mean those holes need to be kept super clean on assembly, its easy to get bits of base gasket down the holes which then blocks the restrictors and seizes the cam. I know Julie and Trigger are well aware of this
But I write this for everybody else as it is valid for all the fours
« Last Edit: October 13, 2017, 02:49:43 PM by Bryanj »

Offline Nurse Julie

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Re: CB400/4 ENGINE STRIP, ASSESSMENT AND REBUILD BY JULIE
« Reply #147 on: October 13, 2017, 04:20:11 PM »
Pictures from bottom to top. The oilway starts (or finishes as I can't quite work out which way it is going yet!!!) in the main bearing housing.
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And comes out on the top of the base (see post on page 25 of this thread re inserting an  'O' ring around this dowel )
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Up via a dowel between the base and the barrels (dowel not in situ in pic)
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Up through the barrels to where the oil control valve is fitted between the top of the barrels and underside of the head ( valve not in situ in pic)
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Up through the head
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Basically it is in a straight line from bottom to top but the hole on the underside of the head has a minute little shelf just inside.






« Last Edit: January 16, 2018, 10:19:20 PM by Nurse Julie »
LINK TO MY EBAY PAGE. As many of you know already, I give 10% discount and do post at cost to forum members if you PM me direct.
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LINK TO MY CB400/4 ENGINE STRIP / ASSESSMENT AND REBUILD...NOW COMPLETE
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Offline Nurse Julie

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Re: CB400/4 ENGINE STRIP, ASSESSMENT AND REBUILD BY JULIE
« Reply #148 on: October 13, 2017, 04:26:39 PM »
And out the other side. This is where the oil pipes fit that I showed in a pic when I first started stripping the engine that spray the cam.

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Here is the pic again
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« Last Edit: October 13, 2017, 04:59:41 PM by Nurse Julie »
LINK TO MY EBAY PAGE. As many of you know already, I give 10% discount and do post at cost to forum members if you PM me direct.
https://www.ebay.co.uk/sch/julies9731/m.html?item=165142672569&rt=nc&_trksid=p2047675.m3561.l2562

LINK TO MY CB400/4 ENGINE STRIP / ASSESSMENT AND REBUILD...NOW COMPLETE
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Offline Bryanj

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Re: CB400/4 ENGINE STRIP, ASSESSMENT AND REBUILD BY JULIE
« Reply #149 on: October 13, 2017, 10:37:46 PM »
Starts at the mains with oil pump pressure and flow, goes upwards till restrictor which cuts down the flow to keep pressure at the crank ends then sprays niftily over the cam, which i al sways thought was a great design.

On the 500 the restrictor is inside the dowel in the base joint which has an O ring round it, they must rely on the dowel being a decent fit and a good gasket seal on the 400

 

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