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Strange Oil Leak. Any Ideas?


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#1 Miki Leyland

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Posted 12 August 2019 - 07:20 PM

Hello all,

 

998 A+ stage 2 recently rebuilt engine (was originally an 850) on remote change gearbox which was also rebuilt with a 3.44 ratio. 1973 Authi Mini (built in Spain).

 

I'm suffering from an oil leak under the driverside (LHD) driveshaft, but cannot assure it's the driveshaft the source or if oil drops just fall down from there. I'm having this leak since the engine was rebuilt in January although did not pay much attention to it at first as it used to come and go with the wind. It is a bit of annoying now and finally I've noticed WHEN it happens but don't know the WHY:

 

I start the engine and if I keep it just on idle without any push on the gas pedal for the first 5 minutes or so until it is hotter, there is almost no leak. What is more, it stops a bigger previous leaking when I follow this "soft" procedure.

 

On the contrary, if I put a bit of gas on the pedal soon after the start when it is cold to rev the engine a bit (no more than 2,500-3000 for sure), the leak is much much bigger and do not stop nor reduce even after weeks without touching the car. It remains leaking the same forever and ever...

 

All above is the same wether I drive the car of leave it in place without moving the wheels.

 

Any idea? Looks like any gasket is suffering from pressure at cold temp, remaining "open" until I gently warm the engine again...

 

Thanks in advance

 

PD: Oil is Millers 20w50

 

 

 



#2 Cooperman

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Posted 12 August 2019 - 07:36 PM

Timing cover gasket or timing cover/crankshaft oil seal would be a good place to check first.

#3 Miki Leyland

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Posted 12 August 2019 - 08:56 PM

Timing cover gasket or timing cover/crankshaft oil seal would be a good place to check first.

 

Thanks Cooperman. I will check for a leak there. But why should it stop leaking when restarting the engine softly? This is what mostly drives me crazy...



#4 Dusky

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Posted 13 August 2019 - 10:19 AM

Only thing I can think of is that an oil seal gets sucked back in place due to the PCV system. Intresting case.

#5 nicklouse

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Posted 13 August 2019 - 10:40 AM

get some oil leak trace in the oil so you can be sure of the point of origin.

http://www.guess-wor...play.htm?id=594



#6 Benoit_Dupont

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Posted 13 August 2019 - 10:56 AM

get some oil leak trace in the oil so you can be sure of the point of origin.

http://www.guess-wor...play.htm?id=594

good to know I discover the existence of this thing :)



#7 whistler

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Posted 13 August 2019 - 11:39 AM

If you have a mechanical fuel pump check the underneath. There's a little hole in the casting and if the internal seal is failng it can drip oil.



#8 Miki Leyland

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Posted 13 August 2019 - 01:42 PM

Thank you all. I'll try to check by myself all this points






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