`pistons problem

[rgh0]

Before boring the block for liners you need to ultrasonically check the wall thickness to determine if sufficient wall will remain after boring to properly support the liner and potentially you will need to offset the bores to get sufficient wall thickness. If the wall splits behind the liner then the liner itself may also split due to lack of support. I have been there had that happen. Absolute minimum wall thickness behind the liner that you should have appears to be around 1.5mm based on my experience. I had a 1.6mm thick wall split and a liner fall. With bore casting O/D of around 89 to 91 mm depending on casting variation and extend of water jacket corrossion you need to centre the liner bore in the casting to get an 86mm liner O/D with at least a 1.5mm wall behind it into a 89mm bore casting O/D.

cheers
Rohan

[albercoc]

ups,,, I think that this work should already be started, do not know if they have been taken into account these factors. ire to the machine shop tomorrow to see how this the Tabajara,
I've seen the liners that are sold for this engine have an O / D of 85.7. and decided to leave it to the diameter, I think if they are doing it this way, it will be correct, anyway I will see tomorrow how it goes, thank you very much for the tips.
Here there is no workshop has tools for ultrasonic checkup (no one has heard of them) so we will have to try their luck.

Greetings, Juan

[rgh0]

Hi Juan
Without the right checks you are relying on luck to achieve acceptable and reliable casting wall thickness and can spend a lot of money sleeving a block and rebuilding the engine only to have a sleeve fail soon after and you have to start again.

If you are lucky you break through into the water passages and have to junk the block when boring it for the sleeves. If you are unlucky you dont break through but have a thin spot that subsequently fails and you thus waste more money and time.

I personally would source a good second hand block from the UK or Ebay rather than try to bore a block to 85.7 mm for sleeving without ultrasonic checking the walls first.

cheers
Rohan