Interested in Language
CHECKING OF CONTACT/GRINDING
Ensure that the components (valve cone and seat ring) reface to one another stay together.
I suspect that there is something wrong with the sentence or something wrong with it.
Maybe the sentence should read:
Ensure that the components (valve cone and seat ring) face one another and stay together.
Ensure that the components (valve cone and seat ring) face one another, staying together.
Ensure that the components (valve cone and seat ring) which are refaced/machined to one another, staying together.
I have no idea what the author meant.
What do you think?
Please help me.
It should be "refaced." Two parts have been re-faced to match each other and provide a good seat.
Once they have been matched, don't mix them all up. Keep the matching pair together.
"Ensure that the components (that have been) refaced to one another stay together."
This thread refers to the process of installing valves in a piston engine.
The individual valves and their corresponding seats are machined separately and then loosely assembled. A paste with an abrasive is applied where the two surfaces meet and each valve is rotated quickly back and forth to 'lap' the valve and seat for a more perfect match. The valves are removed to clean away the abrasive and then reinstalled before the cylinder head is bolted to the engine.
The passage in question urges the mechanic to label the valves so that they will go back in under final assembly to the same place they were 'lapped in' as described above.
I tried to suggest a sentence that would cover two similar (but not quite the same) situations:
1. Reinstalling used valves after those valves and seats have been refurbished by machining new surfaces (refaced).
2. Installing new valves and/or seats in an overhaul or in a brand new engine (machined).
The lapping in procedure (and the need to keep valves and seats matched during preassembly, disassembly, cleaning, and final assembly) is the same for both.