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Supercharger Fill Hole Bolt Stripped

SyntheticShield

SyntheticShield

New member
Okay guys and gals. I need to know what all of you are doing if or when the fill hole bolt to the blower gets stripped out. The hex portion, not the threads. Mine is stripped and I couldnt get the thing out. I used an easy out to get the thing out. Fortunately I have a spare complete blower so I just took the bolt from the spare and put it on the car.

I found out the bolt threads are 7/16-20 x 1/4 or 3/8" long. I went around town and the only bolts I could find like that were hex caps that were 3/4" long minimum. I can work with that and Im pretty sure I could get an Oring on there that would seal things up nicely it just wouldnt necessarily look as good, I dont think anyway.

Does anyone else have any ideas or suggestions? Have any of you tried a better option or are you just buying a replacement bolt from somewhere? Farnsworth, if you see this, since you rebuild the nose drives Id be really interested in what you view is.
 


EEEEEEEEEKS!! I know it would probably be okay but man I would be terrified to be near that thing with my dremel. I guess you would have to have a cutting wheel that had been wore down quite a bit for as small as it is in relation to a new cutting wheel.
 
SyntheticShield said:
EEEEEEEEEKS!! I know it would probably be okay but man I would be terrified to be near that thing with my dremel. I guess you would have to have a cutting wheel that had been wore down quite a bit for as small as it is in relation to a new cutting wheel.
Click to expand...

If you have the bolt out it seems like a good option to do as mentioned and use the dremel to make it a flathead srew slot.
 
I took the next larger size hex head and hammered the SOB in there as hard as I could. Then I just put a ratchet on the other end and unscrew as usual. Its a pretty easy fix, although not the best. You can buy replacement fill plugs, I can't remember exactly how much they are though.
 


Well thats good to know. But Id like to find a more permanent solution. My observation has been that that bolt reacts like the oil filter. A little heat and the sucker tightens up substantially. So I would either like to find a plug that will work better, easier to get out or not as prone to stripping.

But, thanks for the part number. At least I can get new ones until a solution is found. 98GP, my next bigger size hex was too big to be hammered in unfortunately.
 
I don't have an M90 anymore but if you get it out and can figure out the thread pitch and height for me I'll find somehting else for you.
 
When I had one strip, I then used a 5mm hex and a couple light taps with a hammer and it came right out.
 
Yeah, getting it out wasnt so much of a big deal. I was a little concerned but I had a good bolt extractor kit so I felt I would be able to get it out with that, which I was. I either have a bad snout seal or I didnt put the breather nut on there correctly the last time I changed pullies but I was way low on supercharger oil.

So I sucked what was left out, not even half a bottle really, and I put in some full synthetic 0W-20 motor oil for now. Thankfully I have a spare filler bolt, but I think there has to be a more reliable, permanent solution. I took some pics of the bolts I bought with it installed in the snout and I'll post them up shortly. That way everyone can see and comment.

Vinnie, the bolt size and thread pitch are in the first post.
 
Okay, here we go. I couldnt find any bolts that were shorter than 3/4" L, but I do not think it will be an issue. I just need to find an o-ring that will seal off the hole.

In this shot, you can see that an O-Ring will still be needed. I had thought of using thread sealant, but I think an O-Ring would still be best.

IMG_8042a.jpg

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Here you can see that the bolt, even at 3/4" long still does not protrude too far into the case, so there would not be any clearance or obstruction issues.

IMG_8043a.jpg

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Probably the most important part, you can still get a wrench on it to get the thing on and off.

IMG_8045a.jpg
 


I think the bolt would work well, its just not as clean looking as the socket bolt. If an O-ring can be found that would sit nicely in the recess area then it could be an emergency fix at least.
 
You did all of that already? Tell me you found those pics somewhere.

These won't work though will they because there is a lip on the stock set screw?
 


I must mention that if the stock bolt won't come out w/o stripping then it was installed too tight in the first place. Like was mentioned, think about the oil filter.
 
Oh yeah, I will admit that I put it in there too tight, no doubt about that. Ive learned my lesson though. I didnt put the spare one in nearly as tight. But now I want to make sure I have a solid answer available for those that run into this same issue.
 
98GP said:
I took the next larger size hex head and hammered the SOB in there as hard as I could.
Click to expand...

X2.

BUT, I didnt hammer hard, I gently hammered it in as not to distort the threads in the snout. The aluminum snout threads are VERY soft. Hammering too hard can mess them up.

The plug its self is soft for what it is, so using the next half size or next size up will work the best.

~F~
 
Eeeeeeeks. I was envisioning some super duper solution Farns, LOL

Well, alrighty then, I guess I'll have to work on the bolt idea and see if I can make a go of that or some other option.
 
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