Installed 914 Rubber Silicone Valve Cover Gaskets |
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Installed 914 Rubber Silicone Valve Cover Gaskets |
cary |
Jan 25 2018, 09:19 AM
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#1
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Advanced Member Group: Members Posts: 3,900 Joined: 26-January 04 From: Sherwood Oregon Member No.: 1,608 Region Association: Pacific Northwest |
I've tried using the silicone valve cover gaskets a couple times and gave up thinking I couldn't get them to stay in place.
https://900designs.zoeysite.com/gasket-valv...h-temp-silicone So I thought I'd give it one more shot on Mike's car. After taking the valve covers off I could tell the PO had some leaking issues. After running them thru the jet washer 3 or 4 times to most of the adhesive loose. I ran them thru the bead blaster for the final tune up. I decided I try Gasgacinch to try and hold them in place. I let them set up over night. Left went on pretty easy. Only reset a couple time. The right wanted to creep up in the front. So I moved the mini pry bar to that end and worked slowly. Gave the gasket a little smear of motor oil before I installed them. I'll give you an update after we fire it up on Friday. |
VaccaRabite |
Jan 25 2018, 10:06 AM
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#2
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En Garde! Group: Admin Posts: 13,444 Joined: 15-December 03 From: Dallastown, PA Member No.: 1,435 Region Association: MidAtlantic Region |
I've never tried the silicone gaskets, but I am sure they will work well.
You PO's method would have been totally fine if he had used about 1/8th the RTV he used. Its the same way I attach the cork gaskets. A VERY THIN smear of RTV along the gasket to the valve cover. Done this way, the gaskets tend to last several oil changes without leaking. But once you add boogers of RTV, you are introducing all sorts of issues. I'm glad you cleaned that mess out of there! YUCK! Zach |
1adam12 |
Jan 25 2018, 10:16 AM
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#3
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Member Group: Members Posts: 209 Joined: 25-May 17 From: Chino Hills, CA Member No.: 21,132 Region Association: Southern California |
Thanks for posting. I recently installed the 914 Rubber cork versions which are thicker than stock. I wonder if the silicone and cork versions have the same thickness.
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Mikey914 |
Jan 25 2018, 10:19 AM
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#4
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The rubber man Group: Members Posts: 12,669 Joined: 27-December 04 From: Hillsboro, OR Member No.: 3,348 Region Association: None |
The silicone ones are also slightly thicker too.
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JamesM |
Jan 25 2018, 11:42 AM
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#5
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Senior Member Group: Members Posts: 1,900 Joined: 6-April 06 From: Kearns, UT Member No.: 5,834 Region Association: Intermountain Region |
Interested to see what your results are. I bought a few sets of these from the original run (I believe he manufactures these differently now) I installed them dry on my autocross car and they sealed up fine initially however once I started pushing it hard at an autox the lack of rigidity allowed them to get sucked in creating a massive oil leak. May be case specific in that I have no head vents on this motor and run it up near 7k RPM, but I went back to their extra thick cork gaskets and have not had a problem.
I have a 2nd set of the silicone ones that I have RTVd to the valve covers installed on a spare set of heads on my work bench. Havent tried them in the car yet as I have not had reason to pull the valve covers after swapping back to the thick cork. |
cary |
Jan 25 2018, 11:54 AM
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#6
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Advanced Member Group: Members Posts: 3,900 Joined: 26-January 04 From: Sherwood Oregon Member No.: 1,608 Region Association: Pacific Northwest |
Mike will drive it hard. But it's fully vented.
We'll see. |
Mikey914 |
Jan 25 2018, 12:05 PM
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#7
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The rubber man Group: Members Posts: 12,669 Joined: 27-December 04 From: Hillsboro, OR Member No.: 3,348 Region Association: None |
The silicone will work for high RPM but we do recommend that they are thoroughly cleaned and RTV'd in. The other solution is adding fins to the cover. The cork are bullet proof, the silicone has some flex so under very high negative pressure loads you can displace it is it's not perfectly seated. Prep is key here, must be clean and dry.
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76-914 |
Jan 25 2018, 03:58 PM
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#8
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Repeat Offender & Resident Subaru Antagonist Group: Members Posts: 13,502 Joined: 23-January 09 From: Temecula, CA Member No.: 9,964 Region Association: Southern California |
(IMG:style_emoticons/default/agree.gif) adding some small tabs or fins is the trick. (IMG:style_emoticons/default/beerchug.gif)
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