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Old 06-18-2006, 05:15 PM
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Weiand Supercharger Oil Leak

I have a SBC that I installed a 142 CI Weiand supercharger on a few years ago and all has been wonderful until a few hundred miles ago when I noticed a fine oil mist in the engine compartment after a freeway trip.
I know it's coming from the supercharger because it's gear oil (stinks).
It seemed to be coming from the snout of the supercharger so I changed the internal snout seal and bearings just to be sure...not fixed.
The mist is so fine that I'm having difficulty determining the source of the leak...plus the fact the vehicle has to be driven many miles before enough oil leaks out to know whether or not it has been repaired.
Has anyone out there had a similar concern?

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Old 06-18-2006, 05:58 PM
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Are you 100% sure it's coming from the blower? Do you see any evidence on the blower? (oil trail, moisture, etc..). Did you use sealer on your snout bolts? If not, that could be the source of your leak. You might want to double check to be sure the oil is not coming from your breathers (I know you said it has the un-mistakeable gear oil smell but, just covering all bases). There really aren't many places for oil to get out of the blower. Is the back of your blower belt getting wet/moist? How about the back of the blower pulley?

Royce
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Old 06-18-2006, 07:06 PM
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Quote:
Originally Posted by camaroman7d
Are you 100% sure it's coming from the blower? Do you see any evidence on the blower? (oil trail, moisture, etc..). Did you use sealer on your snout bolts? If not, that could be the source of your leak. You might want to double check to be sure the oil is not coming from your breathers (I know you said it has the un-mistakeable gear oil smell but, just covering all bases). There really aren't many places for oil to get out of the blower. Is the back of your blower belt getting wet/moist? How about the back of the blower pulley?

Royce
Royce, thanks for your reply..the only "evidence" I'm seeing is condensation of gear oil mist (droplets) starting about midway from the front pulley to the main housing and then migrating rearward to the entire engine and engine compartment...yes I used sealer and no oil mist is seen near the pulley end of the blower....Nothing at the back of the blower because that's out of the prop-wash.
This mist is no doubt swirling around in the cooling fan airstream (prop-wash)...and that's what makes it so hard to determine the source of the leak.
I even thought it might be boost pressure from inside the rotor housing leaking past the rotor seals into the gear drive housing but there is only "slight" oiling inside the snout itself.
I'm about to replace the front gasket and add some ultra-violet dye to the gear oil to try to "see" the source, but, that's a very messy diagnosis on a show car..hard to clean that dye off!
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Old 06-18-2006, 10:41 PM
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2fast,
Sounds like you have a handle on it. I know what you mean about clean up, not fun. Maybe it is time for a rebuild on the blower (seals). I would interested to hear what you find. Good Luck.

Royce
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