Author Topic: i don't see the O-RING, but haynes says it's there  (Read 1448 times)

Buffo

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i don't see the O-RING, but haynes says it's there
« on: May 12, 2005, 05:17:28 PM »
i have removed the fromt cyl. head (82) and upon reading the haynes manual to do the installation correctly came upon an O-ring that was not on my bike. Or perhaps i am just a complete idiot and cant spot it. anyway, on page 55 (chapter 2) section 7 sub-paragraph 6 it states "...then remove the dowel pins and the large O-ring", all i seen was the head gasket, no large O-ring. And then in section 7 sub-paragraph 8 it says "Install the dowel pins and new O-ring then lay the new head gasket in place." It then refers to photo 7.8 which clearly shows the gasket but what of the o-ring?

Page 61 has an exploded view of the cylinder components and on the front clyinder shows 2 O-rings. One in between the cylinder and the gasket that goes in between the cylinder and the case and one that goes in one of the cylinder bolt holes. since i did not remove the cylinder itself the former O-ring can not be the one that is mentioned in 2.7.8 but i take it it may be the latter although it dose not look all that large to me but i guess "large" is a relative term. Plus i seen NO reason at all to remove any Dowel pins, but this is my first time swaping heads out.

Am i missing something or is this a misprint? ???
Any help would be great.

Don
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Lead_Deficiency

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Re: i don't see the O-RING, but haynes says it's t
« Reply #1 on: May 13, 2005, 04:41:02 PM »
I can only see one for the replacement of the cylinder?
Thats the only one i can see one in the Yamaha Web site micro fiche.

http://www.yamaha-motor.com/sport/parts/home.aspx

just look up the bike

LD
« Last Edit: May 13, 2005, 04:44:57 PM by Lead_Deficiency »

EH

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Re: i don't see the O-RING, but haynes says it's t
« Reply #2 on: May 13, 2005, 07:39:53 PM »
That O ring is about 1/2" across and forms the seal for high pressure oil pumped up to the cams. It fits around a locating dowel. You must install it upon reassembly. Is it stuck to the head? If it was missing to begin with, that is an oil leak at that location.

Buffo

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Re: i don't see the O-RING, but haynes says it's t
« Reply #3 on: May 13, 2005, 07:57:02 PM »
the o-ring that goes around one of the dowel is still in the cylinder. it didnt come out when i removed the head. it seems in quite good shape, do i really need to replace it or can i reuse it?

Don
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Walt_M.

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Re: i don't see the O-RING, but haynes says it's t
« Reply #4 on: May 14, 2005, 02:54:41 AM »
If you can get one, I recommend you go ahead and replace it. If you reuse it and have a leak, it'll cost you another head gasket to replace it.
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EH

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Re: i don't see the O-RING, but haynes says it's t
« Reply #5 on: May 14, 2005, 08:05:11 AM »
I have reused O rings before. It is because I did not want to wait to get a new one. If you can wait to get a new one, thats the way to go. Walt is right about the head gasket, once you tighten it down you cannot reuse the gasket. your choice.

Buffo

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Re: i don't see the O-RING, but haynes says it's t
« Reply #6 on: May 14, 2005, 05:58:20 PM »
i have to wait for the  gasket so i might as well wait for the o-ring too.
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Tdub

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Re: i don't see the O-RING, but haynes says it's t
« Reply #7 on: May 14, 2005, 08:57:08 PM »
Unless the O-ring is torn or deformed, there is no reason it cannot be reused. The same with the head gaskets. I have used them over several times on the race motors with not so much as a leak. As a matter of fact, the multi layer head gaskets call for you to torque the head, release the torque and retorque to spec. JMO Tdub
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jasonm.

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Re: i don't see the O-RING, but haynes says it's t
« Reply #8 on: May 15, 2005, 05:48:01 AM »
Point of fact. We are dealing with a 20+ year old , compressed o-ring. All o-rings distort to conform the the area ?they are in the longer they are compressed in a hot environment. ?Race engines get torn down often that the o-ring is not old enough or compressed long enough to get distorted...yet. ?Best to replace the o-ring.
« Last Edit: May 15, 2005, 05:48:52 AM by jasonm. »
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