Copper head gasket leaking compression
Posted 03 October 2019 - 08:09 AM
The measurements I did on the o-rings was just using a straightedge over the rings and a feeler gauge to measure the gaps at the indications noted on the paper. Keeping in mind that I was doing it with the engine in the car. So, my measurement technique's weren't the best but I did take my time with it. The o-rings should have been well seated because I performed these measurements after tear down post this leaking issue.
Posted 03 October 2019 - 01:53 PM
Posted 07 October 2019 - 07:50 AM
This weekend I hand stoned the deck and removed all of the milling marks. I verified everything was flat, smooth, and clean. I installed copper o-rings of .040" diameter into the o-ring grooves. O-ring protrusion was .008-.009" consistent. I used the AJUSA head gasket and torqued it to 90 ft-lbs with the ARP studs. I did a leak down test cold and had no issues with pressurizing the coolant, consistent values, etc.
Fired her up and took her for a ride. I don't seem to be having issues with smoke after cruising and letting off the gas anymore, but now I have issues with blue smoke when I accelerate! WTH! Also it didn't seem to appear until after driving for 15-20 minutes.
I haven't done any further diagnostics, I spent most of the weekend working on the car and was frustrated and exhausted last night when I found these results. Also, I have an oil leak at the back of the engine. It could be just the valve cover gasket for I didn't replace it and may have over tightened the bolts. Or it could be from the HG and that the copper o-rings didn't crush enough and I have the same damn problem.
Posted 07 October 2019 - 10:57 PM
About the oil leak.. i tried to reuse my vc gasket and holy hell did the back portion puke everywhere! Dont forget the sealer on the "bumps"
About blue smoke.. il bet it will pass. If you had enough pressure in the oil system to pop out ur dip stick... id be willing to bet you have oil puddles in the bottom of the intake.. pvc hoses.. turbo pipes.. intake runners. Turbo seal over pressurized from compression in oil lines? Pop a spring clamp off of a valve seal?
Edited by Rapom, 07 October 2019 - 10:58 PM.
Posted 09 October 2019 - 11:00 AM
I had same EXACT issue with my SCE.
Pound some copper wire into the groove and find yourself an ajusa sir. Then throw that sds in the trash! Haha
Built G54B, S364, R154, stock 6-bolt, fireballs
Posted 10 October 2019 - 10:55 AM
That's what is in there now; ajusa and copper o rings.
Have you used a restrictor on the borg warner s257sxe? I have a -4 inlet and -10 outlet to the pan. no PCV valve currently, relying on the exhaust port running to the valve cover. It definitely pulls vacuum at idle but not sure it is sufficient enough.
Posted 10 October 2019 - 04:50 PM
Could be as previously stated, residual.
I seem to remember you doing some different things with the venturi than me. Not sure if that could be it.
Edited by Funky Phil, 10 October 2019 - 04:58 PM.
Built G54B, S364, R154, stock 6-bolt, fireballs
Posted 04 November 2019 - 01:40 PM
Below are some photos on how it looked after hand stoning the block and adding .040" copper wire in lieu of the .041" stainless wire.
This one shows a good comparison between the finish before and after the stoning.
I didn't 'pound in' the copper wire. I simply placed the AJUSA gasket over-top and torqued the gasket to spec. I did calculate the cross sectional area of the groove compared to that of the wire. Essentially there is enough area in the groove to consume the entire o-ring if it were to be compressed and fully flow into the groove. It's almost a 1:1.
In all, I have solid and consistent compression and leak-down results. I believe this cured the issue I was originally having. However, as noted above, I'm blowing oil on acceleration which eventually resulted in blowing oil even at idle. After pulling the valve cover to do my leak-down test, I noticed the following (exhaust valve on cyl 4):
That there could definitely result in blowing oil! I'm trying to figure out how it happened. The only thing I can think of is that I did flip the head over when I was cleaning the gasket seating surface.
Advice on how to fix the seal? Should I pull the springs and fully replace the seals?
I pushed it back down for now with a pick tool. I would try it but for some reason my fuel pump decided to stop working within 30 seconds of start-up. It has less than 400 miles on it! I'm running e85 but the pump is rated for it (it's an AEM 50-1005). Talk about pissed!
It's always something on this car!
Posted 04 November 2019 - 02:06 PM
1) I'd still be wary of that surface finish. Again everything I've heard stated that a polished surface is what you want for gaskets like the Ajusa. Now I don't have first hand experience, so I can't say definitively.
2) You definitely want to replace at the very least that seal. If the head is still on the block and you don't want to remove it you can remove the spark plug, rotate the motor till that piston is down all the way, fish a clean rope into the cylinder until you can't get any more in there, and then wind the cylinder up until it stops. That will hold the valve up so it won't fall into the cylinder while you take off the spring and replace the seal.
3) Just make sure that your wiring isn't the culprit before you assume the fuel pump is bad. You'll be even more upset if you go through the process of getting a replacement only to it not fix the issue.
Good luck, and stay strong!
EDIT: That valve seal looks like nothing I've ever seen before, maybe look into buying the nice Viton seals from Dad at enginemachineservices.com
Edited by speedyquest, 04 November 2019 - 02:07 PM.
1987 Flatty Starion -- Widebody Conversion -- V-Mount Setup -- JDL Tubular Manifold -- MX-6 Intake -- MS3-Pro -- AEM FPR -- ARP head studs -- 3" hood exit exhaust -- Hahn Racecraft 16g -- Tial F38 Wastegate -- Tial Q Bov -- Short route piping -- 5 lug & LSD conversion -- Tubular Front End -- Manual Steering Rack Conversion -- Manual Brake Conversion -- Stack Digital Dash -- AEM UEGO -- D2 coilovers -- full GNT poly bushings & mounts -- four 8" rears -- car lightened significantly... More to come!
Build Thread ---> http://www.starquest...opic=143564&hl=
Posted 04 November 2019 - 03:55 PM
Randy built this head for me so I assumed these were the felpro viton seals. Are they not?
I have the leak down tester, so I can easily hold the valve up with air pressure to swap out seals. I just need to pick up a valve spring compressor. The only one I have is the large C that wraps around the head.
For the fuel pump, it is getting power and spins just stopped pumping. I put direct power to it last night. It makes a much different noise and won't pump a drop. Looking on the internet this morning, it looks like this is a common problem for them. I'm so glad it didn't cut out like this while driving. Debating on buying another identical pump or going with a different brand now.
Posted 05 November 2019 - 02:41 AM
flipping head upsidedown shouldn't dislodge a valve seal.
I thought Quest Tsi gt35 @35psi build had cracked the code for 2.6 seal: Felpro 8770 + o-ring head
hate to c such a top shelf build having such issues. Hope u sort it out
Posted 05 November 2019 - 06:24 AM
Watch your Tune, timing for 1 Late ignition timing can wear out the guide.
Edited by Dad, 05 November 2019 - 06:43 AM.
Posted 05 November 2019 - 08:32 AM
Thanks for your response! I'll dig up the receipt/invoice for the head build. I'm currently running a Magna cam with Magna roller rockers. It equates to a stock lift. I'll also post up what my current timing curve is.
I looked closer last night and noticed my #3 exhaust seal has also moved up. So it appears to not be just a localized issue. Any chance that the spring is catching on the seal and lifting it up?
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