Surprises when lifting the 55 KH 500 Twin cylinder head
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nevhunter
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Re: Surprises when lifting the 55 KH 500 Twin cylinder head
Will clean easily with Kero. Looks as if there's been a weld there. Nev
Re: Surprises when lifting the 55 KH 500 Twin cylinder head
It´s already cleaned but I have no other photo now. Unfortunately my garage is not next to my appartment.
I´ll give an update with a better photo soon also with regards to what Rob mentioned.
I´ll give an update with a better photo soon also with regards to what Rob mentioned.
Ariel KH 500 Twin 1954 (Modell 55)
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Roger Gwynn
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Re: Surprises when lifting the 55 KH 500 Twin cylinder head
The mod is to reduce the oil supply to the rockers, the pipes you show are the feed and return from/to the oil tank, don't restrict those! I believe Draganfly are about to start making the special stud for the rocker supply 5178-57
Roger Gwynn, Membership Secretary, curator of the Machine Register and the works drawings. Director of Draganfly Motorcycles, Craven Equipment and Supreme Motorcycles mostly retired.
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robjameson
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Re: Surprises when lifting the 55 KH 500 Twin cylinder head
Hi Martin,
From your photo, you have a stud with a domed nut on it immediately below the oil lines as the photo is taken.
Usually you will have a small banjo union which then has a copper pipe leading up to the spider rocker feed on the head (why I call it a spider, I don’t know, it only has 4 legs).
From this union, the rockers are pressure fed oil, which can lead to over oiling and hence your problem.
As Roger suggests, there is a method to restrict this flow by way of a special stud, however, what I have done is to plumb a T piece in to the main oil return line, and put a restrictor in the oil tank to provide a small amount of back pressure so that the rockers are fed oil returning to the tank rather than pressurised oil.
If I get chance, I’ll take some photos to show what I mean.
Rob
From your photo, you have a stud with a domed nut on it immediately below the oil lines as the photo is taken.
Usually you will have a small banjo union which then has a copper pipe leading up to the spider rocker feed on the head (why I call it a spider, I don’t know, it only has 4 legs).
From this union, the rockers are pressure fed oil, which can lead to over oiling and hence your problem.
As Roger suggests, there is a method to restrict this flow by way of a special stud, however, what I have done is to plumb a T piece in to the main oil return line, and put a restrictor in the oil tank to provide a small amount of back pressure so that the rockers are fed oil returning to the tank rather than pressurised oil.
If I get chance, I’ll take some photos to show what I mean.
Rob
Rob Jameson
AOMCC Member Number 4068
1957 Ariel VH
1954 Ariel KH
1948 Ariel 4G with 1920's Ariel Sidecar/Triumph Chassis
AOMCC Twin Spares Organiser
AOMCC Member Number 4068
1957 Ariel VH
1954 Ariel KH
1948 Ariel 4G with 1920's Ariel Sidecar/Triumph Chassis
AOMCC Twin Spares Organiser
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Simon.Gardiner
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Re: Surprises when lifting the 55 KH 500 Twin cylinder head
For the full Factory description of the over-oiling fix (also re. Roger's comment above) see Bulletin 125
https://www.arielownersmcc.com/members_ ... %20125.pdf
SG
https://www.arielownersmcc.com/members_ ... %20125.pdf
SG
Web admin (webmaster@arielownersmcc.com)
'55 Huntmaster, '56 VH, ' 51 VH, '61 Arrow, '80 R100RT, '00 Sprint ST
'55 Huntmaster, '56 VH, ' 51 VH, '61 Arrow, '80 R100RT, '00 Sprint ST
Re: Surprises when lifting the 55 KH 500 Twin cylinder head
The special stud described in the Bulletin is not longer available at Draganfly.
Ariel KH 500 Twin 1954 (Modell 55)
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Roger Gwynn
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Re: Surprises when lifting the 55 KH 500 Twin cylinder head
Iain has just confirmed that Draganfly will be making the 5178-57 stud very soon, it is about to pass from the design stage to the manufacturing stage.
Roger Gwynn, Membership Secretary, curator of the Machine Register and the works drawings. Director of Draganfly Motorcycles, Craven Equipment and Supreme Motorcycles mostly retired.
Re: Surprises when lifting the 55 KH 500 Twin cylinder head
Good news. Thank you for sharing.Roger Gwynn wrote: Sun Jan 19, 2025 11:09 am Iain has just confirmed that Draganfly will be making the 5178-57 stud very soon, it is about to pass from the design stage to the manufacturing stage.
Ariel KH 500 Twin 1954 (Modell 55)
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