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Rocker Shaft : RSR seals ?


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After getting my engine running, and seeing the oil leaks... I recall chasing oil leaks and could never get the lower cam covers dry, no matter what I did.

Lots of reading has made me realise I never "checked" or "re-torqued" the rocker shafts.  I spotted it reading through some old threads on that big-mouthed-bird forum. I was in there so many times trying to fix oil leaks but didn't realise that if the rocker shafts are not actually sealing, then the oil will leak out.

Yes, sounds simple, but its one of those "Porsche things".

I have a full set of the RSR seals, (bought years ago to seal everything), but I also read, somewhere, the RSR had the seals because for the racing engines they didn't have adjustable rockers like a normal engine, and needed to have a quick rocker size change, so they used (smaller sized?) rocker shafts but also used the "RSR seals" to prevent oil leaks.  It seems the DIY 911 gang took this to mean we should all use the RSR rocker shaft seals since they used them in racing so they must be better.

From my (limited) knowledge, I should tighten/torque the rocker shafts as they will seal themselves, unless there is something wrong.

I have never touched them yet, but it would explain my chasing oil leaks !

Anyone got any advice ?

 

 

 

 

 

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When I rebuilt mine I wanted to minimise any oil leaks (there were signs of minor previous leaks) so I considered RSR seals. However, after reading a post here I used two sizes of easily available rubber O rings. I cannot remember who posted the thread, but they had gone to the trouble of identifying the exact sizes required. Better still, as they bought in bulk, they were kind enough to send me a full set. I wish I could remember who it was as I'd like to again thank them for their research and kindness. Perhaps search for the same thread?

Chris.

P.S. No trace of an oil leak now, so they do work. 👍

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Try remembering harder Chris 🙂 - my rockers will be going back on soon (well, within the next millennium)

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Peter, my remembering is getting less and less good! It was a thread here though, try searching..... I have and didn't find it, but it was quite a few years ago now I suspect! I do remember though it was somebody clever like Max Diesel or PorscheApostle..... More clever than me anyway! 

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Found it (maybe)

 

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Yes but..... I don't know how much the Autofarm versions are but Nick F's version comes with through bolts etc and is hundreds of pounds. O rings are pennies and do the job perfectly.

 

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On 06/11/2020 at 22:54, declang said:

From my (limited) knowledge, I should tighten/torque the rocker shafts as they will seal themselves, unless there is something wrong.

 

 

 

Yes that should be the case, but assumes that the bore the shaft sits in is in perfect condition with no scoring, not often the case if the engine has been apart a few times before...

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I have a couple of oil drips from the lower cam covers that I could never get rid of totally, but I've always blamed the gaskets and me not having the knack of tightening the covers correctly. I never checked or tightened the those rocker arm bolts, so maybe that is the source.

I have the RSR seals but it looks like a very fiddly/awkward job with the engine in the car.

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I had the stuff US jobs fitted and they leaked so I changed them for Nick Fulljames version. See a couple of posts up from the bottom (March 2014).

 

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My 10p. Follow MaxDiesel's advice rather than pee money up the wall on fancy o ring "kits". Overtightening the shafts will make the problem worse as the shaft expands when tightened and this in turn ruin's the bore in the cam carrier so be careful. 

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Just a clarification. I should have said over-tightening means the rocker shaft expands too much. A small amount of expansion is normal and required to hold the shaft in place. 

 

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