Oil Leak Fix - Attempt Number 4-6 (Somewhere in there), Suggestions on fixing an oil leak issue by the flywheel |
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Oil Leak Fix - Attempt Number 4-6 (Somewhere in there), Suggestions on fixing an oil leak issue by the flywheel |
netbanshee |
Mar 8 2011, 06:53 PM
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#1
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Newbie Group: Members Posts: 26 Joined: 18-May 08 From: Philadelphia Member No.: 9,071 Region Association: North East States |
Hey everyone,
Been reading the forums for some years, but haven't had much to say up until now. So Hi, Hey and Hello. Nice to meet you. I'm looking for some feedback and/or recommendations on an issue my '70 914 1.7l is having. After replacing the flywheel seal a few times to no avail, my father and I are starting to look at a few other options and suggestions. Here's the car (upon delivery and there on): http://www.flickr.com/photos/netbanshee/27...in/set-1076179/ Regardless of what's been done so far, the car still manages to leak oil at about a drip every 1-2 seconds out of the bottom of the engine near the flywheel. The oil leak persisted after the car blew an oil galley plug behind the flywheel. Before the car decided to dump most of her oil out in the driveway, I was able to shut the car off and keep things from getting much worse. We proceeded to pull the engine and tranny, pull all of the galley plugs and threaded in some new ones. We also hit them up with JB Weld for added assurance. At this point we went ahead and gave the drivetrain and a good once over. We hadn't really pulled apart the car since I purchased it 3 years ago, so no better time then. The car was generally pretty solid up to that point since the owner kept the car in good shape and only put a few thousand miles on the car over the years after an extensive restoration. We checked the pressure release valves, replaced various gaskets, the fuel lines, relocated the fuel pump under the gas tank, fixed up the hell hole before it got away from us, etc., etc. We then went about replacing the flywheel seal and flywheel o-ring. The 3 shims were in good shape so got them cleaned and lubricated before putting them back in the way they were. We permatexed the outside of the flywheel seal, seated it, bolted everything back up and got the drivetrain back in the car. After starting the car, we started to get the oil leak I described. Since then, we have tried different flywheel seals (Elring Klinger at first, then Victor Reinz since) to no avail. We made sure that the end play on the crank was between .003 - .004mm and that we seated the seal flush with the case and in slightly different depths so it didn't ride in the previous spot. Also of note, the leak is definitely between the flywheel and the case. There isn't any foul smelling gear oil from the tranny to note. There isn't any indication that the galley plugs are anything but solid, so our thought was that there was an issue with the flywheel seal. Now that we've replaced it a few times, we're looking at other options. We were thinking that it might be time to replace the flywheel and bolts. The paperwork I have on the restoration suggests that the original flywheel was machined and polished (dual surface) and we did notice that the flywheel seal we initially removed (don't have it anymore) was white and nothing we had seen before. Possible the seal was a different type? So, what does everyone think? Any other ideas or suggestions beyond a new flywheel? Thanks, Sean (netbanshee) |
netbanshee |
Mar 25 2011, 03:54 PM
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#2
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Newbie Group: Members Posts: 26 Joined: 18-May 08 From: Philadelphia Member No.: 9,071 Region Association: North East States |
Thanks to everyone who reached out so far. :)
After chatting with a local dealer mechanic who then put us in touch with a Porsche mechanic, I think we have a good lead. When we pulled the Oil Pressure Relief Valves, they came out way too easy. The mechanic suggested that they were worn and weren't seating properly. If they're not functioning, the pressure in the case is climbing very high and the rear seal couldn't possibly hold that back. He felt pretty confident that this was the issue. I don't have a oil pressure gauge in the car, so I wasn't being provided any warning of rising pressure. If the OPRVs were sticking, there goes the oil galley plug that started the whole scenario and then on. So... off to find some valves. Would it be a good idea to track down completely new ones or can components be replaced (spring, etc.)? Also, it there a difference between valves for a regular Type IV or are they specific to a 914? |
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