" Refreshed ' heads

m5gorrf · 01-17-2021, 07:35 PM

Thanks for reading!

Has been sometime since I worked with intake & exhaust valves & seats.

Would it be normal for the valve to valve seat, to ooze WD 40 slowly (just be wet) on the other side, after being 'refreshed'. In the past never expected seat to be solvent / water tight just not sure of present day specs.

Thanks

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Jp925 · 01-17-2021, 09:24 PM

Just had a similar thing happen. New heads, bolted to block, did a leak down test to confirm everything was fine, 3 of 4 cylinders perfect, cylinder 3 seemed to have an exhaust valve leak. Pulled the head, poured some water in the exhaust port, and it trickled through the valve. Took it back to the shop and they vacuum tested and had 0 leaks with 100psi of vacuum.

He said when there’s no oil in them sometimes they can appear to be leaking but be fine as soon as you start driving it. I’ll be reassembling this week, hoping he’s right.

GeoNV · 01-17-2021, 09:25 PM

Also could have a little grit stick between the valve face and the seat preventing it from closing. Is this with springs on?

m5gorrf · 01-17-2021, 09:44 PM

Yes fully assembled with cam lobes up / off. The 'seepage' is very limited & grit could be the cause. what passes barely wets my finger tip after a few minutes.

Thanks

01-17-2021, 07:35 PM	#1
m5gorrf Scooby Newbie Member#: 468210 Join Date: May 2017 Chapter/Region: BAIC Location: Calif foothills Vehicle: 2006 WRX Wagon Blue	" Refreshed ' heads Thanks for reading! Has been sometime since I worked with intake & exhaust valves & seats. Would it be normal for the valve to valve seat, to ooze WD 40 slowly (just be wet) on the other side, after being 'refreshed'. In the past never expected seat to be solvent / water tight just not sure of present day specs. Thanks * Registered users of the site do not see these ads.

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01-17-2021, 09:24 PM	#2
Jp925 Scooby Newbie Member#: 510046 Join Date: Dec 2019	Just had a similar thing happen. New heads, bolted to block, did a leak down test to confirm everything was fine, 3 of 4 cylinders perfect, cylinder 3 seemed to have an exhaust valve leak. Pulled the head, poured some water in the exhaust port, and it trickled through the valve. Took it back to the shop and they vacuum tested and had 0 leaks with 100psi of vacuum. He said when there’s no oil in them sometimes they can appear to be leaking but be fine as soon as you start driving it. I’ll be reassembling this week, hoping he’s right.

01-17-2021, 09:25 PM	#3
GeoNV Scooby Newbie Member#: 518830 Join Date: Sep 2020 Chapter/Region: RMIC Location: Colorado Vehicle: 2009 WRX dark grey metallic	Also could have a little grit stick between the valve face and the seat preventing it from closing. Is this with springs on?

01-17-2021, 09:44 PM	#4
m5gorrf Scooby Newbie Member#: 468210 Join Date: May 2017 Chapter/Region: BAIC Location: Calif foothills Vehicle: 2006 WRX Wagon Blue	Yes fully assembled with cam lobes up / off. The 'seepage' is very limited & grit could be the cause. what passes barely wets my finger tip after a few minutes. Thanks