I have a '97 Prelude SH and there's a huge leak coming from somewhere on the block on the drivers side. Only when the car is on though. My oil pan will go from full to completely empty in literally about a minute. I was assuming oil pump? I've searched and seen people with big oil leaks coming from the oil filter area, but mines is nowhere near there. I changed my oil about 500 miles before this happened btw.

 

Driver side - could be a balance shaft seal, front crank seal, cam seals, oil pump gasket and I think there's 1 i'm missing....



Honestly, your best bet is to put a jack under the engine and remove the driver side motor mount. Remove the belts and the plastic timing covers - have a peak inside and hopefully find the source of the issue.

 

most likely balancer shaft seals, they tend to leak after so long. happened to my friend lude and took a bit to figure out what it was.

 

Don't forget the oil cooler o-ring


#32
91316-PE7-730 O-RING (62.4X3.1) $2.42

and since you have an SH you might as well change #7 also
15205-P5P-000 GASKET, OIL FILTER BASE $3.85

You will need a 30MM deepwell 1/2" drive socket, a 1/2" drive ratchet, and an oil filter wrench

DIY guide located here
http://www.p r e l u d e power.com/forums/showthread.php?t=324248

-------------remove the spaces

 

good diagram.
do you know how to replace the engine block seal? i have a huge leak and i cant figure out where its coming from. I replaced almost every seal already and im thinking it might be my engine block seal. thanks in advance!