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Old 01-17-2021, 07:35 PM   #1
m5gorrf
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Member#: 468210
Join Date: May 2017
Chapter/Region: BAIC
Location: Calif foothills
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2006 WRX Wagon
Blue

Default " 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
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Old 01-17-2021, 09:24 PM   #2
Jp925
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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 thereís no oil in them sometimes they can appear to be leaking but be fine as soon as you start driving it. Iíll be reassembling this week, hoping heís right.
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Old 01-17-2021, 09:25 PM   #3
GeoNV
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dark grey metallic

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Also could have a little grit stick between the valve face and the seat preventing it from closing. Is this with springs on?
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Old 01-17-2021, 09:44 PM   #4
m5gorrf
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Member#: 468210
Join Date: May 2017
Chapter/Region: BAIC
Location: Calif foothills
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2006 WRX Wagon
Blue

Default

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
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