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914World.com _ 914World Garage _ I found the leakMaybe three of you would have a clue.
Posted by: pcdarks Feb 27 2021, 07:56 PM
I just finished rebuilding my 72 1.7lL and had an elusive oil leak. It would show up on the alternator, crossmember that holds the engine and the shift rod. I have a car lift and was able to get good observation of the area but still could not find the leak. It would not show up on idling the engine but if I took it out and drove it it would leak like a sieve. This is a picture of the block when I rebuilt it and it shows where it was coming from. Just like "where's Waldo" who can find the leak? Hint: it's part of the block on the drivers side. 
Posted by: bbrock Feb 27 2021, 08:25 PM
Dip stick tube.
Posted by: ejm Feb 27 2021, 09:07 PM
Threaded hole for the thermostat pulley bolt
Posted by: hcdmueller Feb 27 2021, 10:26 PM
Threaded hole for the thermostat pulley bolt
I may have left the pulley off my bus motor at one point.
Posted by: iankarr Feb 27 2021, 11:22 PM
Def thermostat pulley bolt
Posted by: bandjoey Feb 27 2021, 11:30 PM
All of the above
Posted by: barefoot Feb 28 2021, 07:52 AM
Oil pump, Taco plate cover, front main seal
Posted by: brant Feb 28 2021, 08:37 AM
Tons of people have made the same mistake with the pulley
Posted by: rgalla9146 Feb 28 2021, 09:14 AM
Oil galley plug ?
Ray do you concur ?
Posted by: SirAndy Feb 28 2021, 11:32 AM
Threaded hole for the thermostat pulley bolt
I may have left the pulley off my bus motor at one point.
The pulley bolt hole goes all the way through into the case.
Seen it many times on "performance" rebuilds where some misguided soul thought that removing the cooling flaps would somehow make the engine run cooler.
Posted by: Highland Feb 28 2021, 11:40 AM
The “2nd” oil pressure relief valve?
Posted by: bbrock Feb 28 2021, 11:48 AM
... It would show up on the alternator, crossmember that holds the engine and the shift rod...
... It would not show up on idling the engine but if I took it out and drove it it would leak like a sieve...
... This is a picture of the block when I rebuilt it and it shows where it was coming from.
I'm doubling down on dip stick tube.
Posted by: Dave_Darling Feb 28 2021, 06:15 PM
I agree with all the folks who said the pulley bolt hole. Especially since it only showed up while driving, when the oil is sloshing around.
--DD
Posted by: GregAmy Feb 28 2021, 07:50 PM
I may have left the pulley off my bus motor at one point.
Pissed me off when I figured it out.
(I installed Tangerine's remote oil cooler which removes the flapper system).
Edit: still pisses me off thinking about it later.
Posted by: Sycolyst Mar 1 2021, 12:42 PM
This guy....as others have said. Fan pulley bolt. 
Posted by: pcdarks Mar 1 2021, 04:05 PM
This guy....as others have said. Fan pulley bolt.
Probably not the only oil leak. Your engine is upside down. Oil is going everywhere.
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