pulling pistons -- cylinder ridge in way

Need to pull pistons from D47J -- to get so to pull the liners.

there is a ridge just at top of the existing liners.

might I be able to push up the pistons over this,
or is there need to cut this ridge down.

if so, how -- what tool -- is such tool available

what other solutions ?

thanks,
tom

There is a tool available from most parts stores called a Ridge remover, it fits in the bore with three legs one of which has a carbide cutter in it to remove the ridge. Mine tightens from the middle to expand and put pressure on the tool to cut then you put a wrench on it and rotate it
Good luck😆

Lots of times you can bump the pistons out past the ridge, but that isn't doing the pistons any good. One of the things that determines the result of a re-ring job is how well they fit the grooves in the pistons.

The main reason to remove the ridge is if you're not replacing the sleeves. If the ridge stays there, the new top ring may be damaged when it comes up against the ridge. The ridge and the old top ring were sort of a matched set, but the new ring will hit the base of the ridge.

If the engine is really tuckered out the top ring groove is probably worn out of spec anyway so new pistons may be required. In the old days if the rest of the ring lands and piston were good you could cut the top land oversize and use wider rings. Not sure all that is cost effective anymore unless your dealing with rare parts that can not be readily replaced.