Noise in fan housing

[Paul Wilson]

I did the search and did find some help. My 66 Square is a daily driver, pure stock and unmolested. The car runs great ! Juet got off the freeway about two blocks from home. Speed about 20 mph. All of a sudden there is this loud rattling noise. Sounded like a lug bolt in a hub cap. I nursed it home. I still have the noise while parked, with engine running. No noise at idle speed. Rev it up a little and its back. It is not steady. I suspect a bolt has backed out, and is flying around inside. Sure hate to pull the engine, as I never have pulled a Type 3.
Paul

[Russ Wolfe]

You have one of the bolts that holds the fan housing to the engine has come loose.
You will have to pull the fan and fan housing to get to it. Use a puller to get the fan off the end of the crank, otherwise you will bend it.
The bolt that holds the fans onto the end of the crank is a 30mm.
Good luck.
_________________
Society is like stew. If you don't keep it stirred up, you end up with a lot of scum on the top!--Edward Abbey

Gary: OK. Ima poop.

[Paul Wilson]

Thanks, Russ. I have plans to rebuild and up grade to a larger motor and dual 36 Dells. I just didn't want to do it now, as the engine still runs strong. The tranny needs attention. I can't let that go on forever .
Damn ! It was a good week untill this.
Paul

[tristessa]

The engine doesn't have to come out, be glad for that. But you are going to have to take off the bellows, the coil & bracket, the generator (disconnect the battery first), the "tin" shroud, the belt, the outer fan/pulley, the U-shaped heater elbows, the "handle" for the rear mount over near the dipstick, and the muffler.

Remove all the bolts holding the fanshroud together. Double-check to make sure you got them all, there's a couple under the "arms" next to the locating dowels that like to hide if you don't know they're there. Splitting the fanshroud takes encouragement -- over time the halves can get pretty well stuck together. The *only* place you want to put screwdrivers to pry with are the wide bosses where the dowels are, anyplace else and you could crack the shroud if you're not careful .. and 6V shrouds don't grow on trees.

Check to make sure the threaded holes in the case aren't stripped. If they are, you might need to get some longer bolts, drill & tap the holes deeper (6mmx1.00pitch tap), or both. Either use loctite on the bolts when putting it back together, fill the cavities in the shroud with silicone after putting the bolts in, or both. You don't want to have to do this again in six months, trust me. Then put everything back together.

Fun times. I've dealt with this on more than a few occasions, but only once on *my* car.

[67stang302]

I sure hope a bolt just backed out. My friends car did this same thing turned out the fan went out. hope this isn't the case for you. I had a hard time finding a fan for him and now I have three
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[2bugtony]

I had the same thing happen about a month ago. There's three bolts that hold the fan houseing on one of them have fell out and is getting into the fan. It make a lot of noise. I didn't have to take the engin out to fix it but I did have to take the headers off.

[Paul Wilson]

Thanks for the advice. I will tackle it this weekend.
Paul

[Bobnotch]

[tristessa]

[Russ Wolfe]

[Paul Wilson]

Well, 4 hours later, both hands are bleeding and I still don't have the muffler off ! I don't think it has ever been off. I had to use a hammer and chisel to remove the donut gaskets and have soaked the joints with WD 40, still won't budge. I have given up for the night. I will try again in the morning. Maby I'll be in a better mood.
Paul

[Russ Wolfe]

OHHH Crap, You do not have to pull the muffler to get the fan housing off.
It will clear the muffler when pulling it.
_________________
Society is like stew. If you don't keep it stirred up, you end up with a lot of scum on the top!--Edward Abbey

Gary: OK. Ima poop.

[Paul Wilson]

Well, I don't know if I should laugh or cry. I wasted a lot of blood, sweat and tears. At least I can stop focusing on the muffler. That's a good thing.
Paul

[tristessa]

[Tram]

I was just gonna say... I've never had to pull the muff to get the housing off, either.
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Немає виправдання для війни! Я з Україною.

[Paul Wilson]

I'm going to try to go forward without removing the muffler. You are right there would be more room but this muffler just don't want to let go.
Paul

[Paul Wilson]

Well, the muffler did have to come off after all. The sheet metal duct would not clear the pulley otherwise. After pulling the fan off, I found the loose bolt . Someone had done this repair before using a sheet metal screw ! Should I try to tap the thread deeper or go to the next size larger thread ? If I go to the next size, I will have to make the counterbore larger also. Hopefully I can do this without removing the front housing.
Paul

[Russ Wolfe]

The stock thread is 6mm x 1.00. If that doesnt work, you might step up to and 7mm or 8mm. Use an allen head bolt, and you won't have problems with the size of the pocket. You might also consider just using a 1/4" x 20 bolt there too. that is slightly larger than a 6mm.
And for a point of info to anyone else, if you take the center bolt and fan loose first, you do not have to pull the muffler. Take the fan and the tin off together.
_________________
Society is like stew. If you don't keep it stirred up, you end up with a lot of scum on the top!--Edward Abbey

Gary: OK. Ima poop.

[Air_Cooled_Nut]

[Paul Wilson]

First of all, I would like to thank all posters for their valuable help on this problem. Next question. How important is the plastic nose cone that fits on the pulley ? My car does not have one ?
Paul