Hw77 25-26mm seals

[joffy]

Stating the obvious... I know they're different sizes but is the piston to seal the same size (got someone to do my metal work but wants drawings ) he is young

[T 20]

Stating the obvious... I know they're different sizes but is the piston to seal the same size (got someone to do my metal work but wants drawings ) he is young

If you're asking if the 25mm and 26mm seal arbours are the same dimensions, Jonathan ?
Then the answer in no.

[joffy]

Cheers mick you wouldn't happen to have the dimensions I did some measuring of the tx200 piston comparing it with the LGV piston and with the new rod fitted I'm short at front by around 18mm but should end up with a piston slightly longer (shorter stroked) but equal in body length to the LGV

[T 20]

Cheers mick you wouldn't happen to have the dimensions I did some measuring of the tx200 piston comparing it with the LGV piston and with the new rod fitted I'm short at front by around 18mm but should end up with a piston slightly longer (shorter stroked) but equal in body length to the LGV

This may sound weird, but I wouldn't actually bother measuring a HW piston to reproduce the seal arbour.

Most HW seals spin on the arbour and have a little free play, you're better off measuring a seal, cutting the retaining slot in the piston head then machining the wider part and frequently test fitting the seal, doing it this way will get a nice tight fitting seal on the piston.

Failing that, if Tinbum doesn't have the dims to hand, I can measure a couple of pistons in the morning for you.




All the best Mick

[joffy]

This may sound weird, but I wouldn't actually bother measuring a HW piston to reproduce the seal arbour.

Most HW seals spin on the arbour and have a little free play, you're better off measuring a seal, cutting the retaining slot in the piston head then machining the wider part and frequently test fitting the seal, doing it this way will get a nice tight fitting seal on the piston.

Failing that, if Tinbum doesn't have the dims to hand, I can measure a couple of pistons in the morning for you.




All the best Mick

Cheers Mick

[tinbum]

I'm in France til next wednesday and I left my veryneargauge at home.
I'll check next week if you still need it.

[joffy]

I'm in France til next wednesday and I left my veryneargauge at home.
I'll check next week if you still need it.

I thought you'd be away enjoying the sunshine

[T 20]

I can measure a couple of pistons in the morning for you.

I hope this will do you, Jonathan, just a quick sketch :-

image.jpg

[joffy]

I hope this will do you, Jonathan, just a quick sketch :-

image.jpg

perfect mick perfect

[joffy]

Which flavour of 25mm seal is best my TX mixup piston has a vac25 on it at the moment but was wondering if the hw 25mm one is the better one or not