Author Topic: CB400/4 ENGINE STRIP, ASSESSMENT AND REBUILD BY JULIE  (Read 6540 times)

Online Nurse Julie

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Re: CB400/4 ENGINE STRIP, ASSESSMENT AND REBUILD BY JULIE
« Reply #135 on: October 11, 2017, 05:00:08 PM »
Just catching up on this thread Julie. Holy sh*te, you've been busy !!!
Yes James, I'm a woman on a mission  ;D ;D Also, I have been given a certain amount of time in the workshop, if I go over that time I incur penalty charges  ::) ::) ::)
A proper nurse would have done the bloods and sent them to the lab. Poor bedside manner! :P
Yes Tim, you're most probably right there  ;D ;D ;D
Im a Nurse, trust me, this won't hurt.....much !!!

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

Online Nurse Julie

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Re: CB400/4 ENGINE STRIP, ASSESSMENT AND REBUILD BY JULIE
« Reply #136 on: October 11, 2017, 05:03:30 PM »
I was disproportionately proud of fixing my indicator earth until I read this thread.....!  :P :D
We should all be very proud of what we do to keep these old girls on the road, regardless of the simplicity or complexity of the task  :) :) :)
Im a Nurse, trust me, this won't hurt.....much !!!

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

Online Nurse Julie

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Re: CB400/4 ENGINE STRIP, ASSESSMENT AND REBUILD BY JULIE
« Reply #137 on: October 11, 2017, 05:20:05 PM »
Not doing much to the bike today but have taken the clocks off to send away for a bit of a spruce up with nice new faces.

I thought I would have a closer look at the cam chain tensioner and assembly. The cam chain tensioner arm (horseshoe) is in excellent condition as shown in the photo yesterday but I will free off the very slight tightness I can feel on the pivot pin as Bryan suggested. The chain tensioner adjuster and the 2 tensioner outer springs are also in good condition so I will use them again along with the chain tensioner holder and dampers.

On the tensioner slipper I can see that the little tabs either side look a little moth eaten and on the guide, there are cracks all the way along its length. I’m going to fit a new slipper and guide anyway but interesting to see the cracks on the surface.

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Im a Nurse, trust me, this won't hurt.....much !!!

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

Offline Bryanj

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Re: CB400/4 ENGINE STRIP, ASSESSMENT AND REBUILD BY JULIE
« Reply #138 on: October 12, 2017, 07:21:42 AM »
Having met both Julie and Trigger and noticed the glints in eyes the only thing that surprises me is that it isn't half back together already!! Honestly though this is well written and should be a great guide when finished, perhaps Steve could put it in tips when its done. I think the only 400 parts i have are the genuine manual and parts book on CD possibly a set of very bad carbs with broken bits unless i binned them as too bad!

Offline Spitfire

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Re: CB400/4 ENGINE STRIP, ASSESSMENT AND REBUILD BY JULIE
« Reply #139 on: October 12, 2017, 12:17:49 PM »
Just read this from the start and as usual I am amazed at the punishment these bikes will take and still run, looking forward to more updates.

Cheers

Dennis
1976 CB750F

1977 CB750F2

1964 BSA A65R

Offline mike the bike

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Re: CB400/4 ENGINE STRIP, ASSESSMENT AND REBUILD BY JULIE
« Reply #140 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.
Why did I get rid of that one

Online Nurse Julie

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Re: CB400/4 ENGINE STRIP, ASSESSMENT AND REBUILD BY JULIE
« Reply #141 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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LINK TO MY CB400/4 ENGINE REBUILD
http://www.sohc.co.uk/index.php/topic,14049.msg112691/topicseen.html#new

Online Jamesh_sussex

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Re: CB400/4 ENGINE STRIP, ASSESSMENT AND REBUILD BY JULIE
« Reply #142 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...!!

Online Nurse Julie

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Re: CB400/4 ENGINE STRIP, ASSESSMENT AND REBUILD BY JULIE
« Reply #143 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.
Im a Nurse, trust me, this won't hurt.....much !!!

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

Online Nurse Julie

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Re: CB400/4 ENGINE STRIP, ASSESSMENT AND REBUILD BY JULIE
« Reply #144 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.
Im a Nurse, trust me, this won't hurt.....much !!!

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

Offline orcadian

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Re: CB400/4 ENGINE STRIP, ASSESSMENT AND REBUILD BY JULIE
« Reply #145 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 #146 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

Online Nurse Julie

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Re: CB400/4 ENGINE STRIP, ASSESSMENT AND REBUILD BY JULIE
« Reply #147 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 »
Im a Nurse, trust me, this won't hurt.....much !!!

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

Offline Oddjob

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Re: CB400/4 ENGINE STRIP, ASSESSMENT AND REBUILD BY JULIE
« Reply #148 on: October 12, 2017, 10:44:23 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??  :) :)
Don't play stupid with me, I'm better at it

Online Nurse Julie

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Re: CB400/4 ENGINE STRIP, ASSESSMENT AND REBUILD BY JULIE
« Reply #149 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
Im a Nurse, trust me, this won't hurt.....much !!!

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