3 inch burrell help

[burrell2023]

Good evening

I’ve ran into a problem with my eccentric rods on the 3 inch burrell, the drawing says 5 and 13/16 but they seem a little long maybe as much as 5-8mm at a guess as I have only eyeballed it so far.

Possible my valve guide is too far forward but this also was determined by the strengthening plate however it looks like it’s large enough to push the guide towards the cylinder block which looks to solve the issue.

Could I actually just shorten the eccentric rods to make everything all line up but would shortening the rods change the amount the valve moves?

I thought it was worth checking with other builders if the eccentric rod length is correct before drilling new holes to fix the piston guides as I will need to blank the existing holes and drill new ones.


Many thanks in advance.

[ettingtonliam]

Yes you could shorten them, but you'd have to make sure the radius of the link matched the shorter rods.

Can I suggest that you draw the whole assembly out yourself, as big as possible to check out what is happening.

See my comments on Henry's draughtsmanship in your other thread.

[burrell2023]

Thank you very much for the advice, I’m not sure I’m skilled enough to change anything on the radius link.

I guess I can make a decision on the next move once the con-rod is in position, if that’s all correct but eccentrics are still wrong then I will have to do more help requests.

I thinks it’s possible my weigh shaft bracket is too far forward so by moving this towards the cylinder block it would solve the eccentric rod length issue.

I wonder if anyone has the correct distance from cylinder block face to either weigh shaft centre line or fixing hole position so I can check mine.

Kind regards
Del