Piston replacement- do I de-glaze?

Hi Everyone,
I will be replacing a single piston in situ in an L series diesel from a freelander, was hoping to pick the brains of the experienced rebuilders on here.
Usually if its a complete block rebuild you have to get the de-glazer/honer out to break the 'glaze' on all the cylinders, allowing the new piston to bed in but im carrying out this repair in situ.
If im fitting a brand new piston will I have to de-glaze that individual cylinder or would you take the chance and just let it run in?

Thanks in advance for your thoughts,

bigdenbailey said:

Hi Everyone,
I will be replacing a single piston in situ in an L series diesel from a freelander, was hoping to pick the brains of the experienced rebuilders on here.
Usually if its a complete block rebuild you have to get the de-glazer/honer out to break the 'glaze' on all the cylinders, allowing the new piston to bed in but im carrying out this repair in situ.
If im fitting a brand new piston will I have to de-glaze that individual cylinder or would you take the chance and just let it run in?

Thanks in advance for your thoughts,

Click to expand...

You will have to deglaze, or it will take till hell freezes over to bed the rings. Many a motors is rebuilt "as you say", insitu tis only if the block needs decking, or line boring that you really need to remove the complete engine. head off, sump off and protect your oil journal with rags and you be right. If it were me, I'd deglaze all pots and replace all of the rings, checking the lands of all pistons in the process.

ssmn1234 said:

You will have to deglaze, or it will take till hell freezes over to bed the rings. Many a motors is rebuilt "as you say", insitu tis only if the block needs decking, or line boring that you really need to remove the complete engine. head off, sump off and protect your oil journal with rags and you be right. If it were me, I'd deglaze all pots and replace all of the rings, checking the lands of all pistons in the process.

Click to expand...

I'll second that Are you replacing the entire piston or just fitting new rings? I think that, whilst you are in the position to do the job, you might as well replace the rings / pistons in each of the four cylinders. Obviously, in order to replace piston rings, you need to remove the piston anyway, and there really isn't that much extra work in doing the other three, just a little more expense. Definitely de-glaze the bores. Have a friend spray an oil into the bore whilst you're deglazing it, and don't go mad. You could end up doing more harm than good if you're not careful. Make sure that you fit new bearing shells for each piston that you replace too.

-pos

New rings = new bores. The cylinder lining has to bed in with the piston rings so it should be at least de-glazed. If there is a step in the bore then it should be honed out as well.

Thanks for all your valued replys, Im now firmly in the right direction!

Sterling work landyzone bretheren!