Author Topic: You think you've got a problem?  (Read 243 times)

Online Greybeard

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You think you've got a problem?
« on: 03.04. 2019 16:44 »
Some folks have bigger problems than us.

I presume that square structure on the left fits inside the piston.

Online RichardL

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Re: You think you've got a problem?
« Reply #1 on: 03.04. 2019 17:04 »
So, apparently, this is from a Wärtsilä RTA96-C, largest engine in the world. I found some other images and the square section seems to be what is called the "cross-head" and where the actual piston rod connects, with the piston many feet above.

https://web.archive.org/web/20100716202400/http://people.bath.ac.uk/ccsshb/12cyl/index.html.o

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Offline Swarfcut

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Re: You think you've got a problem?
« Reply #2 on: 03.04. 2019 17:20 »
Just shows the unreliable nature of two strokes. Plus the need to check those big end bolts.

 Thanks GB and Richard...made my day. The cross head design is usually seen on horizontal single and multi cylinder steam engines, happily working for years pumping water and effluent. The design keeps the piston free from sideways forces, lessening bore wear.

 Swarfy.

Online RDfella

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Re: You think you've got a problem?
« Reply #3 on: 03.04. 2019 19:48 »
Probably over revved it to 300rpm.
Specs: length of 89 feet and a height of 44 feet, the total engine weight is 2300 tons - the crankshaft alone weighs 300 tons. The RTA96C-14 can achieve a maximum power output of 108,920 hp at 102 rpm and astonishingly, at maximum economy the engine exceeds 50% thermal efficiency.
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Online RDfella

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Re: You think you've got a problem?
« Reply #4 on: 03.04. 2019 19:52 »
Here's a couple of better pics:
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Online KiwiGF

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Re: You think you've got a problem?
« Reply #5 on: 04.04. 2019 04:28 »
That bloke in background of the pic in the first post should have a caption along the lines:

“jeez I hope they don’t find out I didn’t use a torque wrench on the big end nuts”

Ok not that funny, anyone got a better caption?
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Online orabanda

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Re: You think you've got a problem?
« Reply #6 on: 04.04. 2019 07:43 »
I remember as an apprentice, doing a three month stint in the powerhouse; 4 off turbocharged Mirrlees engines similar in size to the pic I have found (attached).

One engine had a complete top end overhaul; all heads removed. It was off line for some time, and every component was laid out on tables and accounted for.

When the last head was bolted back on, there was one nut, and washer left over on the assembly tables (couldn't be accounted for).

Every head was removed again as we investigated.

Every nut and bolt had been re-fitted during the assembly, someone had mistakenly placed the extra parts on the table.

No place for carelessness in critical work environments like this.

ps; before you ask, it wasn't me!!!

Richard

Online muskrat

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Re: You think you've got a problem?
« Reply #7 on: 04.04. 2019 09:07 »
G'day GB.
Makes any blow up I've had (a few good ones) pale into insignificance.
Worked on a few biguns as an apprentice similar to Richard's (orabanda). 400 rpm max, 8 cyl, 400mm x 600mm bore and stroke.
Cheers
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Online Greybeard

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Re: You think you've got a problem?
« Reply #8 on: 04.04. 2019 14:46 »
...someone had mistakenly placed the extra parts on the table.
Or was it a mistake!?

Online Greybeard

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Re: You think you've got a problem?
« Reply #9 on: 04.04. 2019 14:49 »
I'm trying to accept that that conrod was simply bent out of shape just like a bendy thing!

Online KiwiGF

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Re: You think you've got a problem?
« Reply #10 on: 04.04. 2019 19:53 »
That bloke in background of the pic in the first post should have a caption along the lines:

“jeez I hope they don’t find out I didn’t use a torque wrench on the big end nuts”

Ok not that funny, anyone got a better caption?


“bugger, I must have forgotten the loctite”
New Zealand

Last had an A10 in 1976, in 2011 it was time for my 2nd one.

1956 Flash Frame EA7-168x Eng. CA10 913x, left BSA together for Liverpool, 5th Dec 1955.

B31 “hot rod” (yeah right)

Armstrong Siddeley Whitley for rainy days (with wife).

GL1800 Goldwing not sure why yet

Online berger

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Re: You think you've got a problem?
« Reply #11 on: 04.04. 2019 19:58 »
caption- I told them not to buy parts from china *problem* *bash* ::hh::