Originally Posted by
JonnyBravo
lol @ that ^^^
You make it sound so simple.
We had a discussion round mine the other night after looking through that out shipyard thread and some more current ones, what exactly do you use to tighten a bolt to 2250bar ! Some of the tools must be ridiculous !
lol its basically done using the stretch in the bolts. If you look in one of the pictures at the top of the thread you can see them lying on the pallet. Its done using hydraulic jacks that screw onto the thread at the end. the jacks are then extended ( only about 5mm) to 2250 BAR ( on a maximator air pump ) using oil and then then nuts are tightend down the thread and the pressure let off. Same for the cylinder heads and main bearing caps. The flywheel bolts and other BIG bolts are done using a torque multiplier. Sometimes it involves using a big bar and inch drive gear.
Hope this makes sense, its not easy to get your head round lol.
The REALLY big two stroke stuff uses the same principles just bigger jacks and nuts.
The jacks themselves are about the size of two bags of suger so are man handelable.
Its easy to get wrong but once you;ve done it several hundred times it gets easier .