Doms CB550F1 project

[Bryanj]

By pins i meant crank pins i.e. big end and mains, sorry i was talking machinist!

[Bryanj]

Forgot to say if you do want to reprofile the cam i have i just picked up from a member in cheltenham who is leaving for portugal and it has slight wear on one lobe so ideal to send away and keep your standard one if in good nick

[Oddjob]

I asked Newman cams if they could reprofile a rocker arm and they said yes, they hard chrome them then grind back to original shape, never knew they did that.

[Trigger]

I would strip the crank down to clean out all the traps as that sealant gets everywhere. Once all cleaned, plasti to see if any of the shells are worn. If it is to spec, you should be good to go with the crank and rods 

[DomP]

I'll strip the crank tomorrow evening once I've ground a socket down to fit the conrod nuts, im concerned the small end on cyl 4 conrod might be worn, it feels looser tha the other three.

 

[Oddjob]

Rods were originally fitted with either green or brown shells Dom. Which is good news as those are easy to find. IF you need them of course.

IF you end up having to replace a rod you'll need to find another with the weight code E on it. Might be easy, might be hard.

[DomP]

I can't make any sense of the crank markings, would they all be same across the entire crank?  I forgot to pick up a socket to grind down today as well so I'm at a bit of a loose end tonight

[Deano400]

Like these markings in yellow Dom. Ignore the red marks.
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[Deano400]

This is a good example. More often very difficult to see.

[DomP]

This is a good example. More often very difficult to see.

 

Thanks matey, I can see the marks just not able to work out what they say as mine are black.  I've butchered one of my 6 sided 12mm sockets now so I've had the conrods off, all looks good on the shell faces and crank.

[Oddjob]

The 400 tended to get white marks and the 500/550 black ones. Those are really clear John. Can't mistake those.

[McCabe-Thiele (Ted)]

If 550 conrods are the same as 500  ones I have a set going spare - just postage cost if it helps.

[Deano400]

The 400 tended to get white marks and the 500/550 black ones. Those are really clear John. Can't mistake those.

The 400s are hard enough to see after 40 years, I guess the 500/550 must be nigh on impossible,

[Nurse Julie]

The very early 750/4 crank markings are in Japanese and you have a translation document to use 😱😱😱😱. Most of the time the Japanese markings are so feint, you can't decipher them at all.

[DomP]

If 550 conrods are the same as 500  ones I have a set going spare - just postage cost if it helps.

Thanks Ted, that's very generous of you.  I'm still trying to work my way through it all at the moment so may take you up on the offer. 

All the roller and needle bearings feel smooth, am I OK to reuse or should I be replacing them at this stage? 

I need to decide on the most cost effective way of buying the gasket sets and oil seals.