Mystery oil leak |
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Mystery oil leak |
Mayne |
Mar 12 2017, 09:40 PM
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#1
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Member Group: Members Posts: 254 Joined: 28-February 17 From: NM Member No.: 20,880 Region Association: None |
Hi everyone, I picked up a 75 914 last summer and have finally gotten it running well enough to drive (which I want to do!). The problem is, a substantial oil leak that I thought I'd fixed is still there. Previously, it would spray oil from the lower drivers side at revs above idle. Not finding a clear source, I dropped the motor and resealed the oil pump, which really seemed like the issue. Motor back in now and the leak is the same. It seems to rev or crankcase pressure related, but now I'm thinking pushrod tubes or valve cover gasket. Any thoughts would be much appreciated.
I'll give a proper introduction with some photos soon. Cheers! |
ConeDodger |
Mar 12 2017, 10:06 PM
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#2
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Apex killer! Group: Members Posts: 23,580 Joined: 31-December 04 From: Tahoe Area Member No.: 3,380 Region Association: Northern California |
If you dropped the motor, you should have completely resealed it. Do it again, but this time replace all the pushrods tube seals and front and rear seals. Adjust the valves while its out on the stand as well. Check your galley plugs.
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Dave_Darling |
Mar 12 2017, 10:47 PM
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#3
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914 Idiot Group: Members Posts: 14,982 Joined: 9-January 03 From: Silicon Valley / Kailua-Kona Member No.: 121 Region Association: Northern California |
Do you have a thermostat? The pulley wheel for the thermostat wire mounts on a bolt in a hole that goes into the sump. If the bolt is left out, you have a nice leak there, but only intermittently!
--DD |
TheCabinetmaker |
Mar 12 2017, 10:50 PM
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#4
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I drive my car everyday Group: Members Posts: 8,300 Joined: 8-May 03 From: Tulsa, Ok. Member No.: 666 |
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rgalla9146 |
Mar 13 2017, 05:39 AM
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#5
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Advanced Member Group: Members Posts: 4,550 Joined: 23-November 05 From: Paramus NJ Member No.: 5,176 Region Association: None |
Spraying out ? Is your crankcase ventilation completely plugged ? If not, you're back to the oil pump, the oil filter, oil filter console, oil pressure switch or galley plugs behind flywheel. |
Mayne |
Mar 13 2017, 10:08 AM
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#6
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Member Group: Members Posts: 254 Joined: 28-February 17 From: NM Member No.: 20,880 Region Association: None |
If you dropped the motor, you should have completely resealed it. Do it again, but this time replace all the pushrods tube seals and front and rear seals. Adjust the valves while its out on the stand as well. Check your galley plugs. (IMG:style_emoticons/default/agree.gif) Yes, I failed on the due diligence. Will take another more thorough shot at it. |
Mayne |
Mar 13 2017, 10:19 AM
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#7
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Member Group: Members Posts: 254 Joined: 28-February 17 From: NM Member No.: 20,880 Region Association: None |
Thanks for the suggestions. The motor will come back out and I will check and fix everything I can. I plan to start a project thread, but here are a few photos:
In the shop: (IMG:http://www.914world.com/bbs2/uploads_offsite/i1322.photobucket.com-20880-1489421966.1.jpg) Engine back in with rebuilt Webers: (IMG:http://www.914world.com/bbs2/uploads_offsite/i1322.photobucket.com-20880-1489421967.2.jpg) First drive with my brother's 69 911: (IMG:http://www.914world.com/bbs2/uploads_offsite/i1322.photobucket.com-20880-1489421967.3.jpg) Looking good with my 951 and 986: (IMG:http://www.914world.com/bbs2/uploads_offsite/i1322.photobucket.com-20880-1489421967.4.jpg) (IMG:style_emoticons/default/beerchug.gif) |
r_towle |
Mar 13 2017, 11:17 AM
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#8
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Custom Member Group: Members Posts: 24,574 Joined: 9-January 03 From: Taxachusetts Member No.: 124 Region Association: North East States |
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Dave_Darling |
Mar 13 2017, 11:34 AM
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#9
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914 Idiot Group: Members Posts: 14,982 Joined: 9-January 03 From: Silicon Valley / Kailua-Kona Member No.: 121 Region Association: Northern California |
Seriously--take a look at the driver's side of the engine from underneath the car. There should be a pulley wheel up toward the front of the engine.
Here's a photo of what it would look like if everything were perfectly spotless (which it never is!) -- (IMG:http://www.914world.com/bbs2/uploads_offsite/www.ratwell.com-121-1489426461.1.jpg) If you don't have that pulley wheel, look for the hole where it should be. Put a bolt in that hole and see if your leak goes away. --DD |
porschetub |
Mar 13 2017, 11:37 AM
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#10
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Advanced Member Group: Members Posts: 4,697 Joined: 25-July 15 From: New Zealand Member No.: 18,995 Region Association: None |
Nice original looking car (IMG:style_emoticons/default/beer.gif) ,I'am presuming you have a hose going from the breather to the carb and that your oil pressure switch has a wire for it.
Before you pull the engine again clean it down with brakeclean (or similar) then run it again without driving it after placing a piece of white cardboard below the engine. I was chasing leaks under my "6'' and found this a good method,have done the same with my T4 and other less notable cars (IMG:style_emoticons/default/biggrin.gif) . Pushrod tube seals are the most likely culprits along with the rocker cover gaskets,I used hydraulic grade''o'' rings on the tubes and a good non-hardening sealer,i have always sealed my gaskets to the rocker covers as well( but not to the head of course ),as mentioned there are plenty of other places that can leak. Oh and by the way (IMG:style_emoticons/default/welcome.png) |
Mayne |
Mar 13 2017, 12:09 PM
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#11
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Member Group: Members Posts: 254 Joined: 28-February 17 From: NM Member No.: 20,880 Region Association: None |
Seriously--take a look at the driver's side of the engine from underneath the car. There should be a pulley wheel up toward the front of the engine. Here's a photo of what it would look like if everything were perfectly spotless (which it never is!) -- (IMG:http://www.914world.com/bbs2/uploads_offsite/www.ratwell.com-121-1489426461.1.jpg) If you don't have that pulley wheel, look for the hole where it should be. Put a bolt in that hole and see if your leak goes away. --DD Thanks, I'll take a look next time I work on it. The leak seems to be higher up, like even above the push rod tubes, and I think the fan is spraying the oil around. I appreciate all the knowledge and suggestions! Maybe I can find the culprit without dropping the motor. |
Shadowfax |
Mar 13 2017, 12:23 PM
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#12
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Show us the meaning of haste Group: Members Posts: 509 Joined: 19-January 15 Member No.: 18,340 Region Association: South East States |
What about the oil cooler seals?
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brant |
Mar 13 2017, 12:34 PM
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#13
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914 Wizard Group: Members Posts: 11,622 Joined: 30-December 02 From: Colorado Member No.: 47 Region Association: Rocky Mountains |
as far as spraying goes
I've also had the oil pressure sender loose where it actually sprayed oil. In my case it was easy to find because it was spraying up through the engine grill and onto the rear glass but most seals tend to leak and not spray (example: I just replaced my distributor seal which was causing a downward drip of oil) |
sdoolin |
Mar 13 2017, 12:37 PM
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#14
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Member Group: Members Posts: 359 Joined: 1-May 14 From: LouKY Member No.: 17,299 Region Association: None |
That is great information about the Tstat roller going all the way through the case. I did not realize this and have been stumped as to why my Tstat roller always has a small drop of Brad Penn 20W50 on it. I'll pull that bolt and add some thread sealer.
Love this site... |
SirAndy |
Mar 13 2017, 12:50 PM
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#15
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Resident German Group: Admin Posts: 41,625 Joined: 21-January 03 From: Oakland, Kalifornia Member No.: 179 Region Association: Northern California |
Do you have a thermostat? The pulley wheel for the thermostat wire mounts on a bolt in a hole that goes into the sump. If the bolt is left out, you have a nice leak there, but only intermittently! this (IMG:style_emoticons/default/agree.gif) |
bandjoey |
Mar 13 2017, 07:27 PM
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#16
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bandjoey Group: Members Posts: 4,925 Joined: 26-September 07 From: Bedford Tx Member No.: 8,156 Region Association: Southwest Region |
Thanks for the suggestions. The motor will come back out and I will check and fix everything I can. I plan to start a project thread, but here are a few photos: In the shop: (IMG:http://www.914world.com/bbs2/uploads_offsite/i1322.photobucket.com-20880-1489421966.1.jpg) Engine back in with rebuilt Webers: (IMG:http://www.914world.com/bbs2/uploads_offsite/i1322.photobucket.com-20880-1489421967.2.jpg) First drive with my brother's 69 911: (IMG:http://www.914world.com/bbs2/uploads_offsite/i1322.photobucket.com-20880-1489421967.3.jpg) Looking good with my 951 and 986: (IMG:http://www.914world.com/bbs2/uploads_offsite/i1322.photobucket.com-20880-1489421967.4.jpg) (IMG:style_emoticons/default/beerchug.gif) The answer clue is the oil breather plumbing on top of the carb air cleaner. Oil vaper hoses from both heads drain into the carbs or a breather box. If the hose is off one or both it'll blow oil everywhere. Ask people following me how I know. (IMG:style_emoticons/default/headbang.gif) |
rgalla9146 |
Mar 14 2017, 08:02 AM
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#17
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Advanced Member Group: Members Posts: 4,550 Joined: 23-November 05 From: Paramus NJ Member No.: 5,176 Region Association: None |
If your crankcase vents have strong pressure you have big problems. If your rear bumper is oily that's a bad sign. |
Mayne |
Mar 14 2017, 09:04 AM
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#18
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Member Group: Members Posts: 254 Joined: 28-February 17 From: NM Member No.: 20,880 Region Association: None |
[/quote] The answer clue is the oil breather plumbing on top of the carb air cleaner. Oil vaper hoses from both heads drain into the carbs or a breather box. If the hose is off one or both it'll blow oil everywhere. Ask people following me how I know. (IMG:style_emoticons/default/headbang.gif) [/quote] I'll check into that as well, though there is no oil leaking on the top of the engine. |
Mayne |
Mar 18 2017, 11:59 AM
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#19
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Member Group: Members Posts: 254 Joined: 28-February 17 From: NM Member No.: 20,880 Region Association: None |
THANK YOU!! Oil leak fixed.
Missing thermostat pulley, no bolt: (IMG:http://www.914world.com/bbs2/uploads_offsite/i1322.photobucket.com-20880-1489859949.1.jpg) New, super fancy bolt: (IMG:http://www.914world.com/bbs2/uploads_offsite/i1322.photobucket.com-20880-1489859949.2.jpg) Drove it for half an hour and other than a few whiffs of oil burning off the heat exchangers, looks good. What fun cars! My 944 turbo and Boxster are amazing cars, but the 914 feels so light and interactive, and the torque makes it quite entertaining. (IMG:style_emoticons/default/beerchug.gif) |
rgalla9146 |
Mar 18 2017, 01:13 PM
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#20
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Advanced Member Group: Members Posts: 4,550 Joined: 23-November 05 From: Paramus NJ Member No.: 5,176 Region Association: None |
Excellent !
Wish I could say I helped.......did learn something though ! |
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