This is the second time I have replaced this gasket. Both are felpro. I sprayed carb cleaner and found a leak under the supercharger around the thermostat housing. So I replaced the gasket and its still leaking so I removed it and put a bead of silicone around the whole gasket, top and bottom. Waited a couple days for it to dry and it still leaks from that same spot. Got a new gasket and checked both mating surfaces with a square and no light comes through. I took 2000 grit sandpaper and wet sanded to remove any corrosion as it looks like its been leaking a while and its still leaking not as bad though.. I torqued the supercharger to 17ft/lbs. Any suggestions?

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86 SE Convertible 3800sc 4t65e HD.

I know most flat surfaces have a torque procedure, where certain bolts are torqued first, in a pattern, and usually in steps, not just straight to max torque. I'm not sure whether the blower has a procedure like this or not, but it'd be worth looking into.

quote Originally posted by Tweeder: This is the second time I have replaced this gasket. Both are felpro. I sprayed carb cleaner and found a leak under the supercharger around the thermostat housing. So I replaced the gasket and its still leaking so I removed it and put a bead of silicone around the whole gasket, top and bottom. Waited a couple days for it to dry and it still leaks from that same spot. Got a new gasket and checked both mating surfaces with a square and no light comes through. I took 2000 grit sandpaper and wet sanded to remove any corrosion as it looks like its been leaking a while and its still leaking not as bad though.. I torqued the supercharger to 17ft/lbs. Any suggestions?

R u talking about the SC gasket or LIM gasket?

quote Originally posted by MstangsBware: R u talking about the SC gasket or LIM gasket?

The sc gasket

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86 SE Convertible 3800sc 4t65e HD.

have you followed a progressive torque sequence? most of the time, you start with the center bolts and spiral out to the outside bolts.

quote Originally posted by ericjon262: have you followed a progressive torque sequence? most of the time, you start with the center bolts and spiral out to the outside bolts.

yeah I started with the center and went side to side alternating from right to left.

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86 SE Convertible 3800sc 4t65e HD.

Is there a lot of corrosion in that area of the intake or some thing is warped in that area for it to be leaking after a gasket change. did you scrape all the old gasket material off and clean the surfaces very well. Dan

There are little o rings in that gasket area also (if i recall properly). Those are new also?

quote Originally posted by FIEROFLYER: Is there a lot of corrosion in that area of the intake or some thing is warped in that area for it to be leaking after a gasket change. did you scrape all the old gasket material off and clean the surfaces very well. Dan

Yeah I cleaned it and block sanded it with 2000 wet

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86 SE Convertible 3800sc 4t65e HD.

Then most likely you have some thing warped enough to cause the leak

quote Originally posted by FIEROFLYER: Then most likely you have some thing warped enough to cause the leak

Yeah that was my thought that's why I took a straight edge and back lit it with a flashlight to the supercharger and intake manifold and got no light through.

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86 SE Convertible 3800sc 4t65e HD.

did u try sanding the cover on a surface plate? I had a similar issue with thermo cover on a side by side. You couldn't tell with a straight edge that it wasn't true. I did figure 8 oscillations on the surface plate and kept checking it till it was flat. No problem after that. Just a suggestion.
troy

quote Originally posted by fieroaddicted: did u try sanding the cover on a surface plate? I had a similar issue with thermo cover on a side by side. You couldn't tell with a straight edge that it wasn't true. I did figure 8 oscillations on the surface plate and kept checking it till it was flat. No problem after that. Just a suggestion. troy

No I used a small 3x5" sanding block.

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86 SE Convertible 3800sc 4t65e HD.

could it be the throttle body gasket?

quote Originally posted by conan469: could it be the throttle body gasket?

Nope that's new and no stumble when that's was sprayed.

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86 SE Convertible 3800sc 4t65e HD.

Could it be the leaking around where the rod for the boost bypass valve goes into the SC or a possible crack some where that you are not able to see with the naked eye

quote Originally posted by FIEROFLYER: Could it be the leaking around where the rod for the boost bypass valve goes into the SC or a possible crack some where that you are not able to see with the naked eye

Don't thinks so but I will try that. I can only hear it stumble when I directly spray at the supercharger where the thermostat housing is. That and when I took the gasket off, that area was a little corroded and the gasket was s different color like it was saturated from the carb cleaner. I'll have to see if I can shoot a vid.

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86 SE Convertible 3800sc 4t65e HD.

Is it leaking Air or Antifreeze ? the only place anti freeze can leak there is the "O" rings. anything else is compressed air.

quote Originally posted by Lou6t4gto: Is it leaking Air or Antifreeze ? the only place anti freeze can leak there is the "O" rings. anything else is compressed air.

Not that I can tell

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86 SE Convertible 3800sc 4t65e HD.

I just pressurized the intake from the throttle body and blocked off the brake boost and purge solenoid lines. I get no noticeable bubbles from around that area, but it will stumble if sprayed with carb cleaner.

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86 SE Convertible 3800sc 4t65e HD.

[This message has been edited by Tweeder (edited 01-29-2014).]

quote Originally posted by smartaxel: There are little o rings in that gasket area also (if i recall properly). Those are new also?

Yes those little round seals about the size of a quarter can leak. You should have seen mine when 2 Seat Garage took the SC off. What a mess.