is there any way to stop it? i have a 4x4 saff and the noise cracks me up. im currently rebuilding the engine and was wondering if there anything i can do while the engine is out.

 

use 4x4 pistons iirc as the gudion pin is off set on them!


edit just seen yours is 4x4.......

is it a 200 block you have?

 

i have a 4x4 saff, so im guessing it has 4x4 pistons

 

If your rebuilding the engine you will cure the slap anyway?

 

it wont i think, as there is some thing causing it

 

piston rings lol

 

Excessive wear in the bore causes piston slap therefore if your rebuilding the engine surely you will have a rebore and new pistons thus getting rid of the piston slap. These engines didnt have piston slap when they came out of the factory did they! And a fully rebuilt engine should be as good as new.

 

Slap occurs when the pistons can move around too much in the bore, the 4wd has an offset gudgeon pin hole bore which cuts down on this, but if the pistons/bores are worn you can still get slap.

A correctly rebuilt 4wd motor on Mahle pistons with the correct piston to bore clearance (around 2 thou off the top of my head) wont have any slap at all even from cold.

 

Lol, snap!

 

i'll check the bores then? should there be much of a gap between the piston crown and the bore?

 

You need to take the pistons out to check it properly.

But you can always try tipping it side to side to see if its allowed to move much.

 

As said, the problem was with the 2wd pistons the central gudgeon pin allowed the piston to rock in the bore, exaggerated as the engine wore. The 4x4 piston has an offset gudgeon pin to counter this , so when you get the block rebored and new pistons, it will be cured. However, I would still replace the little end bearings as well just to be on the safe side.

 

The 2wd wrist pin was also offset, just not by as much/enough, 4wd has a larger offset.
It's not harmful anyway.
tabetha

 

Personally, I like the noise

 

....

 

they dont have a offset bore chip, did you mean gudgin pin there ?

 

The hole for the gudgeon pin is bored into the piston so that it is offset from the centre, have edited it so it reads more clearly now.

 

Chip, awesome edit ..... Never wrong