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StiffGizzard Samba Member
Joined: August 03, 2018 Posts: 43
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Posted: Mon Aug 20, 2018 9:40 pm Post subject: Is it possible to replace valve seats? ‘65 1200 |
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So I finally pulled the valves off and started lapping and noticed that exhaust valve seats 1&3 are fucked.
The valves sit flush with the top of the guide and never mind the leak down, I can see LIGHT through one side like the guide is ovalized
Any idea why 1&3 would be in the exact same shape while all the others are solid?
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parker007 Samba Member
Joined: December 21, 2011 Posts: 132 Location: california
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Posted: Mon Aug 20, 2018 9:43 pm Post subject: Re: Is it possible to replace valve seats? ‘65 1200 |
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can be fixed by good machine shop. but sometimes cheaper to find used good head. when seat lose machine shop has to make new seat, true pocket and install then grind, expensive. |
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StiffGizzard Samba Member
Joined: August 03, 2018 Posts: 43
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Posted: Mon Aug 20, 2018 10:45 pm Post subject: Re: Is it possible to replace valve seats? ‘65 1200 |
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Is it possible to just run an over sized valve that would sit on the top of the seat like the rest?
... or am I just fucked....
Any idea how much it would be for two replacement single port heads? |
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parker007 Samba Member
Joined: December 21, 2011 Posts: 132 Location: california
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Posted: Mon Aug 20, 2018 11:07 pm Post subject: Re: Is it possible to replace valve seats? ‘65 1200 |
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that head look like fixed before by hacker, no cant just change valve. problem is gases going between seat, plan new seat with full rebuild or new head. |
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glutamodo The Android
Joined: July 13, 2004 Posts: 26325 Location: Douglas, WY
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Posted: Tue Aug 21, 2018 1:34 am Post subject: Re: Is it possible to replace valve seats? ‘65 1200 |
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Valve seat replacement is a high specialty job - one that most general purpose machine shops are not going to be able to do.
It was with the change to square boss heads during the 1965 model year that VW changed to a higher quality valve seat, pretty much "unleaded quality" seats began then. Before that, valve seats could and would erode away with modern fuel. I know, I've seen it on my own engines before I changed to square boss heads. (Not that I haven't seen heads form after this time also have horrible valve seats) _________________ Andy T.
IMAGE NOTE: It has been noted that Chrome based browsers may have issues in displaying my vast image library, which use non-secure links and are on an FTP server. Images should still be viewable if the link is clicked though.
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rcroane Samba Member
Joined: January 03, 2013 Posts: 2000 Location: Springfield, Virginia
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Posted: Tue Aug 21, 2018 4:54 am Post subject: Re: Is it possible to replace valve seats? ‘65 1200 |
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glutamodo wrote: |
Valve seat replacement is a high specialty job - one that most general purpose machine shops are not going to be able to do.
It was with the change to square boss heads during the 1965 model year that VW changed to a higher quality valve seat, pretty much "unleaded quality" seats began then. Before that, valve seats could and would erode away with modern fuel. I know, I've seen it on my own engines before I changed to square boss heads. (Not that I haven't seen heads form after this time also have horrible valve seats) |
Andy...did the replacement "F" heads also have the higher quality valve seats, or was it just the square boss heads? Thanks. _________________ '65 Sunroof Bug |
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glutamodo The Android
Joined: July 13, 2004 Posts: 26325 Location: Douglas, WY
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Posted: Tue Aug 21, 2018 8:58 am Post subject: Re: Is it possible to replace valve seats? ‘65 1200 |
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Oh, good point there. I think they did, but I never saw any kind of service bulletin saying so. _________________ Andy T.
IMAGE NOTE: It has been noted that Chrome based browsers may have issues in displaying my vast image library, which use non-secure links and are on an FTP server. Images should still be viewable if the link is clicked though.
I do not know how to fix this. All I can say is it all works fine for me with what I use, Firefox. |
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