|
Post by kris on Sept 12, 2017 10:33:18 GMT
No, neither does copper need quenching, that just cools it quicker and with copper, flakes the oxide scale off to some degree. At skule we used to have a sulphuric acid bath to remove the scale, which slowly turned blue with copper sulphate. Ithats interesting I was always taught you needed to quench copper to anneal it. Oil is used by blacksmiths for quenching.
|
|
|
Post by Jim on Sept 12, 2017 14:56:39 GMT
Annealing takes the crystal structure of the metal back to a soft state, with large crystals, to remove the effects of work or age hardening which creates small brittle crystals. It's usually needed with Ali or copper because we have worked with it to make something. Or to soften a washer. Steel on the other hand, is an alloy of carbon and iron (plus other stuff to make other alloys, eg, stainless. Heating dissolves the carbon into the iron, depending in the carbon content the steel can become brittle and hard or soft and malleable. The quenching freezes the crystal structure, it may then need to be tempered/reheated to a specific lower temperature to make it springy , hard or strong. Quenching in oil cools it slower and affects the properties. The single crystal jet engine blades are cast and cooled very slowly. Here endeth the lesson for today! See, I'm not just a 🤡. I'm a clown that made the poles and seating for a circus tent, from scratch, and built my own unicycles when I first started.
|
|
|
Post by Tony Dunkley on Sept 10, 2022 13:27:24 GMT
You are looking in completely the wrong place. There is something wrapped around your propeller. The Shit-for-Brains diagnosis of what was likely to be wrong with an engine that won't start or run in neutral, . . inspired, . . is it not ?
|
|
Deleted
Deleted Member
Posts: 0
|
Post by Deleted on Sept 10, 2022 14:24:51 GMT
To be fair ... engine stalls putting the boat in gear , that's the easiest and most obvious first check don't you think ? Rog ETA and it's page 7 where TonyDunkley starts to insult and abuse
|
|
|
Post by Tony Dunkley on Sept 10, 2022 17:20:58 GMT
To be fair ... engine stalls putting the boat in gear , that's the easiest and most obvious first check don't you think ? Rog ETA and it's page 7 where TonyDunkley starts to insult and abuse Only if you're a complete idiot, . . which, of course, the man who suggested it IS ! The first action following an engine stall on clutching in, . . is to reselect neutral and see if the engine will restart. If it does restart and run, . . in neutral, . . THEN you check the prop for rubbish, and that the tailshaft is free to rotate. If the engine turns over on the starter but won't restart and run, . . in neutral, . . then you begin looking and checking for engine problems, . . beginning with the fuel system.
|
|
|
Post by Isambard Kingdom Brunel on Sept 10, 2022 18:40:21 GMT
With a high level pick up and the fuel tap at the top, is the fuel tap itself or its connections letting air into the fuel pipe? Hence you have no draw on the pickup pipe in the tank.
|
|
|
Post by JohnV on Sept 10, 2022 19:27:48 GMT
With a high level pick up and the fuel tap at the top, is the fuel tap itself or its connections letting air into the fuel pipe? Hence you have no draw on the pickup pipe in the tank. or as I had, the fire valve packed in .... caused a lot of head scratching I can assure you (MUST replace the bloody thing ..... one day )
|
|
|
Post by Tony Dunkley on Sept 12, 2022 14:37:37 GMT
To be fair ... engine stalls putting the boat in gear , that's the easiest and most obvious first check don't you think ? Rog ETA and it's page 7 where TonyDunkley starts to insult and abuse What, . . exactly, . . have I posted on page 7 in the way of insults or abuse ?
|
|
|
Post by Tony Dunkley on Sept 14, 2022 14:06:50 GMT
Is it common to have to lift an engine out to set the injection timing? Asking for a friend No.
|
|
|
Post by Tony Dunkley on Feb 16, 2024 5:55:25 GMT
Well the engine is out now. Many thanks to Mr Stabby who hauled the boat to the lock while I made a futile effort to steer it with my pole, due to the silt being about 3 feet deep. The yard had the engine out in 2 minutes, very impressive. A fork lift truck and chains, bit of manouvering past the exhaust, it was out, and now is on my stern deck. The latest frustration is that there are no timing marks on the crankshaft pulley. It never rains, it pours. Any idea why that mindless lying arsewipe Vince-"Mr Stabby"-Coventon posted this : -- < thunderboat.boards.net/post/388307/thread > -- : on here yesterday ?
|
|
|
Post by Tony Dunkley on Feb 16, 2024 8:24:35 GMT
|
|
|
Post by Mr Stabby on Feb 16, 2024 12:23:14 GMT
Tony, I wonder if you could use your vast experience and knowledge as a marine engineer to tell me what you think this yellow thing might be?
|
|
|
Post by Tony Dunkley on Feb 16, 2024 19:02:50 GMT
Well the engine is out now. Many thanks to Mr Stabby who hauled the boat to the lock while I made a futile effort to steer it with my pole, due to the silt being about 3 feet deep. The yard had the engine out in 2 minutes, very impressive. A fork lift truck and chains, bit of manouvering past the exhaust, it was out, and now is on my stern deck. The latest frustration is that there are no timing marks on the crankshaft pulley. It never rains, it pours. Any idea why that mindless lying arsewipe Vince-" Mr Stabby"-Coventon posted this : -- < thunderboat.boards.net/post/388307 > -- : on here yesterday ?
|
|
|
Post by Mr Stabby on Feb 16, 2024 19:17:57 GMT
|
|
|
Post by Tony Dunkley on Feb 17, 2024 17:29:03 GMT
Well the engine is out now. Many thanks to Mr Stabby who hauled the boat to the lock while I made a futile effort to steer it with my pole, due to the silt being about 3 feet deep. The yard had the engine out in 2 minutes, very impressive. A fork lift truck and chains, bit of manouvering past the exhaust, it was out, and now is on my stern deck. The latest frustration is that there are no timing marks on the crankshaft pulley. It never rains, it pours.Mindless lying arsewipe Vince" Mr Stabby"Coventon posted this stupid remark < thunderboat.boards.net/post/388307/thread > on here yesterday, . . I can't believe you - Clinton Cool - don't know why, . . or what's behind it. Is your memory failing you, or getting a bit hazy ? Well, . . that's easy enough to remedy, isn't it, . . just read what you posted yourself in this thread at the time, . . it's up there, just above this, . . and then put a few words in a post on here that will put an end to the lie that your friend Coventon initiated about me taking your engine out and then buggering off and leaving it standing on the aft deck of your boat for three weeks. Have the decency to make the truth known about this long-standing malicious lie, and the mindless piece of rubbish who first originated it. Make what you say quite plain to him, and anyone else who thinks that it's funny to continue perpetuating this lie through the pages of this forum. I think you've sat on the fence and kept shtum for long enough, . . don't you ?
|
|