SOHC.co.uk Forums > CB350/400

Head probs.

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mike the bike:
Re posted from another thread...

After gunking off the head and further cleaning in the dishwasher,  I noticed the cam journals don't look too healthy.   There's quite a bit of swarf had scored the ally, probably the left overs from the vapour blasting years ago.
Q1.  is the head and rocker cover scrap?
Q2.  Can I just carry on using is as it is?
Q3.  Why didn't the oil filter clean all the crap out?

Trigger:
Can not see it, so can not comment.
Is it light scoring ? Is it heavy ? Is the measurements within spec ? And a filter doesn't collect everything.

mike the bike:
I called in Thunder Road and had a word with one 8f the mechanics.  He told me it isn't serviceable.  Not a problem,  I've got a spare head.

K2-K6:
Is that all the bearings in the head casting? If so, what are the top ones like? The caps in effect.

Looks like it's been run on knackered oil,  doesn't need abrasives if the oil film breaks down it'll do that. The filter will just catch the bits coming out from the bearings to prevent it going round again.

Chris400F:

--- Quote from: mike the bike on December 06, 2016, 12:00:21 AM ---There's quite a bit of swarf had scored the ally, probably the left overs from the vapour blasting years ago.
Q3.  Why didn't the oil filter clean all the crap out?

--- End quote ---
Methinks if the swarf or other stuff was left in the engine it would get pushed through the oilways around the engine before it gets back to the point where it would get filtered out.

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