Seal up gearcase on 6-71 blower? - Hot Rod Forum : Hotrodders Bulletin Board
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Old 03-09-2010, 10:01 AM
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Seal up gearcase on 6-71 blower?

I have an original GMC blower that I ran for a while. The issue I have is the gear case is open to the bottom of the blower. That's not a big deal, but if you take the blower off, the gear oil runs out all over the intake. Is there a way of sealing up this internal passage so the blower can be removed without spilling all the gear oil?

I was thinking of simple blockoff JB welded inside.

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Old 03-09-2010, 11:08 AM
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There shouldn't be ANY opening like that. The only thing I can think of that might be remotely close is that originaly the 6-71's were oiled from the engine oiling system, and you're missing an Allen plug somewhere. Maybe some pictures, or a more detailed explaination of where the oil is coming from would help...
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Old 03-09-2010, 07:46 PM
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Yup, look like drain back holes, there's one on all four corners. Probably could be tapped and plugged like you said. It been a few years since I looked up in there and didn't remember them just being holes.

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Old 03-09-2010, 08:18 PM
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It would be best to tap/allen head plug them, rather than JB Weld them. Pressure builds up in the gear case, and might pop the JB Weld out. It wouldn't go anyplace...until you pulled the blower. Then it would drain all over your intake, etc. You shouldn't need to worry about the ones at the back...there's just greased bearings in the end plate.....
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Old 03-09-2010, 09:32 PM
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Hey >>>----->, it's me, Lee in KC! In the OEM installations of these blowers, engine oil was fed to the gear boxes and drained back into the crankcase, so that's what you're dealing with. Drill, tap and plug, as has been suggested, is the fix.

EDIT: Ooops, don't know how I missed desoto's post that says the same thing I said!

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Old 03-10-2010, 10:33 PM
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also get a vent on the top of the front cover or you'll be puking seals
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Old 05-15-2010, 08:37 PM
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Quote:
Originally Posted by XNTRCI-T
Hey >>>----->, it's me, Lee in KC! In the OEM installations of these blowers, engine oil was fed to the gear boxes and drained back into the crankcase, so that's what you're dealing with. Drill, tap and plug, as has been suggested, is the fix.

EDIT: Ooops, don't know how I missed desoto's post that says the same thing I said!
Hey all, I'm having the same problem with My blower. What is the best way to tap these holes, from the bearing plate gear side, or the case, intake side? Thanks.
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Old 05-15-2010, 09:37 PM
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Quote:
Originally Posted by stimpy
also get a vent on the top of the front cover or you'll be puking seals
Vents on the gearcase? I'm running an 8-71, there is no vent, no blown seals. Is there something about OEM blower over aftermarket we don't know?
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Old 05-16-2010, 06:02 AM
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I also added a gear case drain...along with a push to vent button...
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