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RD90
RD90

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Garethed



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Registered: October 2008
Location: Cardiff
Posts: 613
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Tekoa Engine Room Sulzer RD90
· Date: Thu, 27 February 14 · Views: 784
· Tags: 1 · Filesize: 66.1kb, 66.2kb · Dimensions: 1024 x 612 ·
Additional Info
Keywords: Tekoa
Location photo was taken: Melbourne
Date photo was taken: 1969
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Author
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makko

Senior Member

Registered: July 2006
Location: Mexico City
Posts: 5,749
Thu, 27 February 14 16:00

It was a hard job to get the rotary exhaust valves back together with those awful carbon vanes! We also suffered casing erosion in a T/C and had to replace it with one which had been built up with weld, quite an artistic piece! The casing arrived in a rowboat off Singapore! That engine was a 9RD90.
Rgds.
Dave
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Garethed
Senior Member

Registered: October 2008
Location: Cardiff
Posts: 613
Thu, 27 February 14 17:32

I never had the pleasure of dismantling a rotary exhaust v/v. I do remember the racket they made on this 10month trip.
Garethed
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Ian J. Huckin

Senior Member

Registered: September 2008
Location: Sallisaw, Oklahoma
Posts: 1,398
Thu, 27 February 14 18:15

Scavenge fires, blown oil seals on chain drive for rotary valve, units at 4,000 hrs, changed every single crosshead bearing while in HUD on a 9rd90. Blower casing comments are very familiar, and just a whole never ending slew of things failing. Never liked Sulzers...never will. And that includes many a modern one too....give me B&W and Doxford LBD anyday...Sulzers were always over rated. Funny enough I now work for a company that bought out a chunk of Sulzer and all of Eischer Viess...

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There are holes in the sky where the rain gets in, but the holes are small, that's why rain is thin...
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Macphail

Senior Member

Registered: October 2008
Location: Scotland
Posts: 724
Fri, 28 February 14 15:09

On the RD90 the air start valve sat on the cylinder cover insert. Which was jacket water cooled.
On the "Volnay", on standby entering Port Jackson, first movement. test the engine astern, an almighty thump, the jacket water header tank erupted, boiling water cascading down on the control platform.
The relief valve on the air start manifold had sheared the retaining studs and lay in the bilge. Help Tugs.
On investigation it was found that on one cylinder , the air start passage to an air start valve had a corrosion fracture.
Making the jacket water system common with the air start system.
On the first start the full starting air was applied to the jacket cooling water system.
One massive water hammer.

Happy days,

John
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Doxfordman

Senior Member

Registered: March 2005
Location: Hobart, Tasmania
Posts: 2,128
Mon, 3 March 14 22:55

Coasted Tekoa in 77 and was deep sea on the Tongariro in 72 - never want to see another rotary exhaust valve again! Any names for the lads in the pic??

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Dox (R907127)
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dja
Senior Member

Registered: June 2011
Location: Southampton
Posts: 679
Mon, 17 March 14 15:54

I liked Sulzers, but admit to some major workups with rotary exhaust valves on the RD's. RND's were better although many memories of changing banks of reed valves in the scavenge space. RL's were OK. RTA's good. Havnt had the pleasure of the RTA-Flex.
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MarEng

Senior Member

Registered: August 2006
Location: NL
Posts: 199
Tue, 29 April 14 13:20

I liked the RND very much, the RD less for the here above mentioned rotary valves. (changed them a few times)
What I remember from the forged steel RND-M heads is, that these had the problem that the bore cooling passages at either side of the indicatorcock and the starting air valve were too close causing corrosion and subsequent leakages in that area.
Had to hammer in nylon sleeves to insulate (making the cooling less effective) these areas.
Not an easy job when the bore was not clean, the nylon sleeves became stuck half way you wanted them to be.
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Bill Morrison
Senior Member

Registered: May 2013
Location: Aberdeen
Posts: 771
Tue, 29 April 14 15:34

OK, rotary ex valves were a pain but working on RD's was less physically demanding some great devises to help. My worst memory is of "Daros" piston rings. They started breaking up and passed into the turbo blowers the noise was heart stopping if you were under the scavenge belt. Thankfully they done away with.
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MarEng

Senior Member

Registered: August 2006
Location: NL
Posts: 199
Tue, 29 April 14 17:25

@Bill,
I forgot that one!
Buckets full of broken pistonring parts, damaging the 'ringcatchers' before the TC, the turbine itself and of-course the rotary exhaust valves.
Was the topring not a so-called 'K1' ring with its ends slightly bend inwards?
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wartsilasulzer
Senior Member

Registered: January 2013
Location: Helensburgh
Posts: 1,225
Thu, 8 May 14 07:10

Short sleeved white boiler suit, must be an Electrician...
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Steve Oatey

Senior Member

Registered: February 2008
Location: Vancouver Island
Posts: 1,214
Thu, 8 May 14 23:19

We had the linkage break on a 5 cylinder RD, so two of the exhaust valves stopped rotating. Not good.
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makko

Senior Member

Registered: July 2006
Location: Mexico City
Posts: 5,749
Fri, 9 May 14 10:26

Steve,
Maybe my memory is playing tricks but I have a vague memory of the linkage being a pain in the @rse too!
Rgds.
Dave
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Garethed
Senior Member

Registered: October 2008
Location: Cardiff
Posts: 613
Thu, 15 May 14 15:04

Doxford Man. Sorry for the delay.
The two clean ones are electricians (no surprise!). The one at the back is Peter Edwards, in front of him is ??Howells and to his left is Keith Jamieson. I don't remember the other names.
Happy Days on Tekoa.
Rgds.
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