Valves still leaking after 2 machine shops did valve job

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04-30-2018 | 07:19 PM

#11

GNJ

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From: Tampa, FL USA

Quote:

Originally Posted by 14 apache

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.

04-30-2018 | 08:34 PM

#12

14 apache

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From: Northport N.Y.

Quote:

Originally Posted by GNJ

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?

04-30-2018 | 09:04 PM

#13

GNJ

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From: Tampa, FL USA

Quote:

Originally Posted by 14 apache

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.

04-30-2018 | 09:37 PM

#14

14 apache

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From: Northport N.Y.

Quote:

Originally Posted by GNJ

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.

05-01-2018 | 05:33 PM

#15

Camalot

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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.

05-01-2018 | 06:21 PM

#16

14 apache

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From: Northport N.Y.

Sounds like the SR-71 with the fuel tank leaking after one flight and no fix for it.

05-01-2018 | 08:37 PM

#17

GNJ

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From: Tampa, FL USA

Quote:

Originally Posted by Camalot

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.

05-01-2018 | 08:55 PM

#18

Janet

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Joined: May 2013

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From: Wyandotte Michigan

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.