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Old 11-07-2010, 06:38 AM
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Blower experts please! Oil in release valve?

Hi, Im looking for some blower experts please.

Just on the test run after a bottom engine re fresh and cam change on SBC 350 with 4/71 blower.

When I push the pressure release valve in the front oil cover, I have oil squirting out of the pressure release valve. That never happened before the re-fresh.

Does anyone know what would cause this? Is it the front bearing seals? Im not really sure how the air mixture is suppose to get in the front oil cover in the ist place - but obviously it does But how?

Any comments or advice appreciated and thanks in advance

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Last edited by physcult; 11-07-2010 at 06:46 AM.
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Old 11-10-2010, 08:41 PM
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Can't help you I've only run the centrifigual blowers. How about shooting an e-mail to the manufacture of the Blower?
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Old 11-11-2010, 01:15 AM
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Where is the relief valve located?? You should not be reliving the pressure. It is required to maintain good seal on the rotor seals.

Normal oil level for street is about the bottom hole of the 3 hole cover. Not real critical.

I run even a little more as it quiets the gear noise down. I they sound cool but driving all day long the noise gets old after a while.
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Old 11-11-2010, 03:19 AM
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Thanks for the replies.

Its been suggested on another forum that if there is a smell of petrol with the oil, which there is, that it is the front seals worn.

The reason I was checking the valve was because the boost gauge was reading off the dial, then not at all. I suspected the gauge was at fault, but wanted to check that there was boost being made.
I think Ill replace the two seals and see if that works.

Thanks guys.
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Old 11-11-2010, 03:28 AM
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Quote:
Originally Posted by bentwings
Where is the relief valve located?? .
Its a BDS blower and its close to the top of the front cover.

I guess that if the seals are slightly worn, too much mixture enters the chamber and the pressure lifts the oil as well I presume when the seals wear more they will eventually allow oil in the rotor side.
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Old 11-11-2010, 09:16 AM
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The seals are lip seals and seal the gear oil in but allow blower pressure to get into the gear case. This helps the seals do their job.

You can get a little gas mixture in the oil. a little doesn't hurt. If you have a sight glass just monitor the level. Otherwise just remove the lower bolt. If gear lube comes out it's ok, if not pull one of the other bolts and add gear lube.

It does make a mess when the seals fail but that is quite rare for the few miles that most of these are run.
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Old 11-11-2010, 09:56 AM
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Ill drive it around for a while and then re-check the pressure release valve for oil and or gas smell.

Thanks for the information
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