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 Post subject: Rocker cover vented
PostPosted: Sun Feb 25, 2018 5:43 pm 
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848cc
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Joined: Sun Nov 09, 2014 8:44 pm
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Location: Melbourne
Hi all

I purchased my Mk 1 S with an alloy rocker cover with a vent pipe near the filler cap connected to the airbox.

I was looking to replace it with a tin one but am puzzled as to whether I need a vent pipe.

I am aware of the cut outs for the head bolts so do I search for one with the cut outs and a vent pipe?

Maybe someone out there has the one I need that they are happy to sell?

I go to various show and shines and talk to mini owners and walk away further puzzled but I guess that part of the intrigue of minis.

Thanks in advance.


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 Post subject: Re: Rocker cover vented
PostPosted: Sun Feb 25, 2018 5:50 pm 
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1275cc
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Joined: Sun Apr 29, 2012 1:19 pm
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Location: Wollongong, NSW
Have a look through the photos on here, the rocker covers were plain tin with no breather. The breather from the tappet cover went to the PCV
http://classicregister.com/id-pages/how ... oper-s-mk1

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 Post subject: Re: Rocker cover vented
PostPosted: Sun Feb 25, 2018 6:46 pm 
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1275cc
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Here is a period photo from a 1967 S that I like to refer to.

They never vented to the airbox. Rocker cover had no vent pipe.

Attachment:
1967 MK1 S engine.jpg


The MK1 S had 2 types of rocker covers. The first had a riveted Morris and Patents plate from 1965 to 1966.

Attachment:
1965 - 1966 MK1 S Rocker Cover.jpg



The second had the Morris and Hot run tested stickers from 1967 to 1969. I am not 100% of the exact change over.

Attachment:
1966 - 1969 MK1 S Rocker Cover.jpg


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 Post subject: Re: Rocker cover vented
PostPosted: Sun Feb 25, 2018 7:12 pm 
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848cc
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Joined: Sun Nov 09, 2014 8:44 pm
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Location: Melbourne
Thanks GTO you are always a wealth of knowledge.

You can see the blank behind the oil filler on both rockers which is where my pipe is on the alloy cover.

I know now what to look for- just hate the alloy.

Thank you again


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 Post subject: Re: Rocker cover vented
PostPosted: Sun Feb 25, 2018 7:37 pm 
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1275cc
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Tomtax wrote:
Thanks GTO you are always a wealth of knowledge.

You can see the blank behind the oil filler on both rockers which is where my pipe is on the alloy cover.

I know now what to look for- just hate the alloy.

Thank you again


The 1970 MK2 S had the same except they used just one Hot run sticker at the front. So it doesn't matter which one you use if you are going to respray and re-sticker it. Here is a photo borrowed from Winabbey.

Attachment:
1970 MK2 S Rocker Covers.jpg


One thing to look out for is the embossed Mowog Aussie map. They were only fitted to Aussie motors - not the Cooper S. My car has this type fitted by the previous owner and I have been too lazy to change it.

Attachment:
Non S Rocker Cover.jpg


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Last edited by gtogreen1969 on Sun Feb 25, 2018 8:57 pm, edited 1 time in total.

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 Post subject: Re: Rocker cover vented
PostPosted: Sun Feb 25, 2018 8:07 pm 
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998cc
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Location: Tassie
Did the Clubman Gt have the same as the Mk2?

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1963 Morris 850 Shadow Blue
1965 Morris Mini Smooth Van
1966 Morris Mini Van
1969 Morris Mini Deluxe Resto
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 Post subject: Re: Rocker cover vented
PostPosted: Sun Feb 25, 2018 8:18 pm 
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1275cc
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Scoop wrote:
Did the Clubman Gt have the same as the Mk2?


I am not an expert on the GT so maybe someone else will jump in.

I believe the early GT engines had the same as the MK2 S and the later GT engines had the embossed Mowog Aussie Map.

Here are photos of 2 early and 1 late and you can just make out the embossed rocker cover on the late one.

Attachment:
Early Clubman GT engine.jpg


Attachment:
Early Clubman GT engine bay B&W.jpg


Attachment:
Late Clubman GT crash test 1206 engine.jpg


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 Post subject: Re: Rocker cover vented
PostPosted: Sun Feb 25, 2018 10:02 pm 
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Joined: Fri Apr 29, 2005 9:46 am
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Location: Under the bonnet son!
The rocker cover you are after without the breather came with the British built engines. like the Cooper S and 998 Auto. They each had a PCV, so didn't need a rocker cover breather. They differ only slightly from each other with the clearance for the extra bolts on the Cooper S.

It can be simple enough to find a 998 Auto rocker cover and file the reliefs yourself for the head nut/bolt. Its only a small crescent filed for each.

https://www.ebay.ie/itm/CLASSIC-MINI-10 ... 1a439d74eb

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 Post subject: Re: Rocker cover vented
PostPosted: Mon Feb 26, 2018 8:11 am 
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998cc
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Joined: Sat Mar 24, 2012 1:39 pm
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Location: qld
On the NO breather rocker covers, was the oil filler cap vented?. Is there any correlation to vented /unvented caps and the rest of the breathing arrangements? Also to Tomtax, your original question regarding changing,,,, are you looking at:
need ( eg 1.5 RRockers won't fit under existing)
Being period authentic
simply preference or
performance, as i daresay the answers could be different . cheers


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 Post subject: Re: Rocker cover vented
PostPosted: Mon Feb 26, 2018 9:11 am 
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Location: near Baulkham Hills, NSW
Yes the cars with PCV valve or carb vac ports ran the breather cap. But a sealed cap worked fine on my 1412 stroker.

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 Post subject: Re: Rocker cover vented
PostPosted: Mon Feb 26, 2018 11:27 am 
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998cc
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Joined: Wed Sep 22, 2004 5:46 pm
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Location: Melbourne
You don't really need a vented cap or rocker cover when you have a CCV valve/system.
Virtually all modern engines have a CCV system and the engine is sealed - ie no external breathers.
They rely on air being drawn into the engine past the crankshaft oil seals for the CCV system.
It also helps minimize oil leaks from the seals.

RonR

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 Post subject: Re: Rocker cover vented
PostPosted: Mon Feb 26, 2018 2:38 pm 
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1275cc
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Joined: Sat Feb 09, 2013 5:44 pm
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Location: Camden
A hijack question re. rocker covers:
Was a thick spacer washer always fitted between the rocker cover cap nut and the cup washer that covered the rubber grommet?


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 Post subject: Re: Rocker cover vented
PostPosted: Mon Feb 26, 2018 4:28 pm 
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998cc
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Joined: Mon Jan 12, 2015 10:59 pm
Posts: 963
Location: Holt ACT
Bill B wrote:
A hijack question re. rocker covers:
Was a thick spacer washer always fitted between the rocker cover cap nut and the cup washer that covered the rubber grommet?


Yes, AFAIK, Bill.


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 Post subject: Re: Rocker cover vented
PostPosted: Mon Feb 26, 2018 5:34 pm 
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848cc
848cc

Joined: Sun Nov 09, 2014 8:44 pm
Posts: 169
Location: Melbourne
To FNQ

Yes just after period authentic. I just have a preference for unmolested mini's. Mind you what is really authentic is always questionable given the lack of Mini records.

Regards

Tom


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