| O ring - getting it right | |
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BrianD Don Abbondio
![Don Abbondio Don Abbondio](https://i.servimg.com/u/f55/18/33/01/80/donabb12.png)
![BrianD](https://2img.net/u/2917/50/91/60/avatars/1227-11.jpg)
Posts : 162 Join date : 2015-12-19
![O ring - getting it right Empty](https://2img.net/i/empty.gif) | Subject: O ring - getting it right Wed Mar 27, 2024 4:34 am | |
| Is there an eaasy way to ensure the O ring is seated properly when refitting the breather cap on the cylinder head?
The bit I am talking about is part number 874521 description Breather cover cpl | |
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GuzziSteve Fra Cristoforo
![Fra Cristoforo Fra Cristoforo](https://i.servimg.com/u/f55/18/33/01/80/fracri11.png)
![GuzziSteve](https://2img.net/u/2917/50/91/60/avatars/1385-34.jpg)
Posts : 791 Join date : 2016-04-14
![O ring - getting it right Empty](https://2img.net/i/empty.gif) | Subject: Re: O ring - getting it right Wed Mar 27, 2024 7:57 am | |
| I did not find that part #. Do you mean the cover over cam gear on back of head? | |
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BrianD Don Abbondio
![Don Abbondio Don Abbondio](https://i.servimg.com/u/f55/18/33/01/80/donabb12.png)
![BrianD](https://2img.net/u/2917/50/91/60/avatars/1227-11.jpg)
Posts : 162 Join date : 2015-12-19
![O ring - getting it right Empty](https://2img.net/i/empty.gif) | Subject: Re: O ring - getting it right Wed Mar 27, 2024 9:35 am | |
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GuzziSteve Fra Cristoforo
![Fra Cristoforo Fra Cristoforo](https://i.servimg.com/u/f55/18/33/01/80/fracri11.png)
![GuzziSteve](https://2img.net/u/2917/50/91/60/avatars/1385-34.jpg)
Posts : 791 Join date : 2016-04-14
![O ring - getting it right Empty](https://2img.net/i/empty.gif) | Subject: Re: O ring - getting it right Wed Mar 27, 2024 10:10 am | |
| I use a dab of real sticky syn grease or a spot of black rtv. | |
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Pete Roper GRiSO Capo
![GRiSO Capo GRiSO Capo](https://i.servimg.com/u/f17/18/33/01/80/benefa10.png)
![Pete Roper](https://2img.net/u/2917/50/91/60/avatars/2-52.jpg)
Posts : 10555 Join date : 2013-05-29 Age : 67
![O ring - getting it right Empty](https://2img.net/i/empty.gif) | Subject: Re: O ring - getting it right Wed Mar 27, 2024 2:26 pm | |
| There are two different designs for the breather plate and two different o-rings depending on which one you have.
Early motors just use a very thin section ring that crushes into a taper in the face of the orifice in the head. Later versions the cap has a groove machined n the spigot of the cap that a fatter o-ring sits in.
On the early heads that use the first system the orifice in the head has a stepped tunnel. On later heads the tunnel is a parallel sided bore. The later breather plate covers won't fit into the early heads.
If you have the correct o-ring for your head and breather plate design there should be no problem with fitting. If you are trying to use a fat, later type, o-ring on an early plate it won't crush down properly and if you are using an early o-ring on a later plate it will be too large and too thin to fit in the groove properly. | |
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BrianD Don Abbondio
![Don Abbondio Don Abbondio](https://i.servimg.com/u/f55/18/33/01/80/donabb12.png)
![BrianD](https://2img.net/u/2917/50/91/60/avatars/1227-11.jpg)
Posts : 162 Join date : 2015-12-19
![O ring - getting it right Empty](https://2img.net/i/empty.gif) | Subject: Re: O ring - getting it right Thu Mar 28, 2024 5:16 am | |
| Pete, that's interesting to know, I have usually gone and ordered what has been listed on the parts site and the parts manual.
I do recall that I had some sort of O ring band installed and the replacements were O rings.
Do you happen to know the part number for the early heads please?
thanks | |
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GuzziSteve Fra Cristoforo
![Fra Cristoforo Fra Cristoforo](https://i.servimg.com/u/f55/18/33/01/80/fracri11.png)
![GuzziSteve](https://2img.net/u/2917/50/91/60/avatars/1385-34.jpg)
Posts : 791 Join date : 2016-04-14
![O ring - getting it right Empty](https://2img.net/i/empty.gif) | Subject: Re: O ring - getting it right Thu Mar 28, 2024 6:48 am | |
| Early oring is #976584. I thought you were referring to the late one w/groove. | |
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BrianD Don Abbondio
![Don Abbondio Don Abbondio](https://i.servimg.com/u/f55/18/33/01/80/donabb12.png)
![BrianD](https://2img.net/u/2917/50/91/60/avatars/1227-11.jpg)
Posts : 162 Join date : 2015-12-19
![O ring - getting it right Empty](https://2img.net/i/empty.gif) | Subject: Re: O ring - getting it right Thu Mar 28, 2024 7:19 am | |
| I am pretty sure I have the stepped head and a groove on the cap, I shall be checking again shortly so can feed back.
Thank you for the p/no I took a look and it is O-ring 44.17X1.78mm the ones I get are O-ring 47,35X1,78
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GuzziSteve Fra Cristoforo
![Fra Cristoforo Fra Cristoforo](https://i.servimg.com/u/f55/18/33/01/80/fracri11.png)
![GuzziSteve](https://2img.net/u/2917/50/91/60/avatars/1385-34.jpg)
Posts : 791 Join date : 2016-04-14
![O ring - getting it right Empty](https://2img.net/i/empty.gif) | Subject: Re: O ring - getting it right Thu Mar 28, 2024 8:14 am | |
| Late ones are P/N # 880965 2.62 X 46.52 fits in groove | |
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