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-   General Q & A (https://www.offshoreonly.com/forums/general-q-20/)
-   -   Valves still leaking after 2 machine shops did valve job (https://www.offshoreonly.com/forums/general-q/353662-valves-still-leaking-after-2-machine-shops-did-valve-job.html)

GNJ 04-30-2018 07:19 PM
Originally Posted by 14 apache (Post 4624178)
Are these after use or before you used them in the boat? Never ran before?
I've had these heads for 2 years now. They had a valve job done after leaky headers were replaced and caused the reason for renewing.

14 apache 04-30-2018 08:34 PM
Originally Posted by GNJ (Post 4624189)
I've had these heads for 2 years now. They had a valve job done after leaky headers were replaced and caused the reason for renewing.
Have you used them before you found them leaking?

GNJ 04-30-2018 09:04 PM
Originally Posted by 14 apache (Post 4624207)
Have you used them before you found them leaking?
Yes they were being used. I noticed one motor kept giving a code. Vacuum test indicated low on that motor.

14 apache 04-30-2018 09:37 PM
Originally Posted by GNJ (Post 4624212)
Yes they were being used. I noticed one motor kept giving a code. Vacuum test indicated low on that motor.
Its not uncommon for a valve seats to leak when they get cold they get worn more in some spots when they get to temp. But yours sound excessive.

Camalot 05-01-2018 05:33 PM
I don't think you have a real problem, we rebuild many engines and after the vac test all is golden. You will always see and false leak down on NEW heads or valve job until run for X hours.

14 apache 05-01-2018 06:21 PM
Sounds like the SR-71 with the fuel tank leaking after one flight and no fix for it.

GNJ 05-01-2018 08:37 PM
Originally Posted by Camalot (Post 4624367)
I don't think you have a real problem, we rebuild many engines and after the vac test all is golden. You will always see and false leak down on NEW heads or valve job until run for X hours.
The heads were run for about 20 hrs. The motor acted lazy getting on plane and the computer was throwing a code, A vacuum test showed it was down on vacuum compared to the other motor. In my experience, leaky valves don't fix themselves.

Janet 05-01-2018 08:55 PM
Chitty Valve job
 
If the machine shops working on your heads use grinding stones to grind the seats thats your problem. Probably ground to death and the margins are gone. Probably all out of shape. Take them to a shop that has a serti seat cutter problem solved.

GNJ 05-01-2018 09:12 PM
Originally Posted by Janet (Post 4624397)
If the machine shops working on your heads use grinding stones to grind the seats thats your problem. Probably ground to death and the margins are gone. Probably all out of shape. Take them to a shop that has a serti seat cutter problem solved.
Thank you Janet - Finally some good advise.....

Unlimited jd 05-01-2018 10:54 PM
No one should still be using stones to grind seats. I learned how to use cutters in high school almost 20 years ago


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