Even as ship spare stockists, or a business supplying marine parts, there may be a few questions you have in regards to marine piston rings. Luckily, we’re here to answer them.
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The most common material for piston rings to be made out of is cast iron. This is because the original shape’s integrity is retained through dynamic forces such as heat and forceful loads. Furthermore, cast iron has high wear resistance and is fully compatible with the material of the cylinder liner.
If a customer comes in asking why their piston rings are wearing out at a quicker pace than usual, there’s a good chance that their engine is suffering from a poor filtration system or a lubrication problem, rather than an issue with the quality of the ring. If either of these systems fail, then this will result in the piston ring wearing and failing at a far faster rate.
If a customer comes in asking this question, it may be hard to provide them with a definitive answer. Piston rings, per se, do not have a straightforward lifespan. By normal standards, they should last for thousands of hours. However, this is dependant on the factors surrounding and affecting the ring – such as the ones above.
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Today we are going to talk about the differences between piston and rod wear rings.
What I’ve got up on the board – you can kind of imagine –on this side [left] we’ve got your piston groove. Where you have this piece of metal running inside of your cylinder.
And on this side [right], you’ve got your cylinder head where the rod is going to be sliding in here. If you know what a wear ring is, it supports your moving piece of hardware, here in the case of the piston, and stops it from banging the inside of your cylinder. How are you going to get this super rigid, tough material wear ring to fit into its groove when you’ve got this extra piece of metal, this lip, keeping it from falling off? You can’t just bump it in and slide it over because you have a larger diameter.
What’s the answer? You cut it.
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There are three types of cuts. The butt, the step, and the angle cut. They are all essentially the same for the purposes of this discussion.
The same question over here.
How are you going to get this rigid rod wear ring inside when you’ve got the larger diameter for the wear ring OD and the smaller diameter where you’re going to have to allow the rod to slide through?
The answer again is to cut it.
The answer is no.
PISTON WEAR RING: The fundamental difference is that the piston wear ring you’re going to want to stretch it and allow it to collapse into its groove to eliminate its gap as much as possible.
ROD WEAR RING: The opposite is true for the rod wear ring because you are going to want to crumple it into a smaller diameter and allow it to spring and expand to that larger diameter.
We are out here at the mobile hydraulics training center where we train our salesmen and engineers on how to rebuild hydraulic cylinders.
What I’ve got on the bench are two cylinder head glands like you’d see on the back or front of a piston cylinder, as well as two pistons.
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