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Bugeye54487
Samba Member
Joined: August 09, 2021
Posts: 56
Location: WI
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 Posted: Wed Jan 25, 2023 4:47 pm Post subject: Question on heads |
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Have some valve leakage according to leak down test.
1 Can I just clean the valves and lap them to seal?
2 I assume the black is blow by on my bottom head?
What caused it and how to prevent it from doing so.
Last edited by Bugeye54487 on Wed Jan 25, 2023 5:47 pm; edited 1 time in total |
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Glenn 
Mr. 010
Joined: December 25, 2001
Posts: 76884
Location: Sneaking up behind you
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| Posted: Wed Jan 25, 2023 4:48 pm Post subject: Re: Question on heads |
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| Bugeye54487 wrote: |
| 1 Can I just clean the valves and lap them to seal? |
Mostly likely needs new valves and seats... guides also.
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Glenn
74 Beetle Specs | 74 Beetle Restoration | 2180cc Engine
"You may not get what you pay for, but you always pay for what you get"
Member #1009
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Pruneman99
Samba Member
Joined: February 22, 2012
Posts: 5013
Location: Oceanside
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| Posted: Wed Jan 25, 2023 4:55 pm Post subject: Re: Question on heads |
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| Are you sure it's the valves leaking? Sure looks like the it was leaking pretty bad at the cylinder to head. |
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67rustavenger
Samba Member
Joined: February 24, 2015
Posts: 9749
Location: Oregon
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| Posted: Wed Jan 25, 2023 6:02 pm Post subject: Re: Question on heads |
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Send the heads to Larry in Mi.
I have never had any work done by him yet. But I may need him for some future case/head work.
https://www.thesamba.com/vw/classifieds/detail.php?id=2334287
OP, your heads likely need the valves checked by a pro.
Also the heads likely need fly cutting to get a good seal.
Before I install heads and cylinders. I lap the cylinders to the head. Once the cylinder is lapped. Mark it's specific location that it's lapped to.
This reduces the chance of leaks down the road. Unlike what we are witnessing in the above image.
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