Really weird!

volkyoo · Posted: Mon Feb 25, 2013 5:05 pm Post subject: Really weird!

Hi , i started engine today and suddenly found a really weird noise, like a goose or some bird when i rev the engine, i dont hear it from inside the car, just when im near the engine bay, it,s just for seconds but im worried about it! do you have any idea what that could be?

bsairhead · Posted: Mon Feb 25, 2013 5:09 pm Post subject:

Pulley tin scraping? Something sucked into fan shroud? Points block dry?

jfats808 · Posted: Mon Feb 25, 2013 5:24 pm Post subject:

bsairhead · Posted: Mon Feb 25, 2013 5:27 pm Post subject:

That too.

volkyoo · Posted: Mon Feb 25, 2013 5:33 pm Post subject:

thanks!
ill do that , about the dizzy i have an msd one, should i check that in that model too?

jfats808 · Posted: Mon Feb 25, 2013 5:47 pm Post subject:

Well since its an msd distributor that changes a few things. Get simple and rev the engine at the throttle outside the car and locate the area of the sound. Id freak out too if I heard a goose when reving my engine.
_________________
2276 IDA's 86C 11-1 DD

volkyoo · Posted: Mon Feb 25, 2013 5:54 pm Post subject:

could that sound be made by the alt fan? i feel a litle movement over the fan, but the fan nut is rock solid at least to the fingers spec lol!

jfats808 · Posted: Mon Feb 25, 2013 6:19 pm Post subject:

U can get crafty and make sure. Half inch ratchet, extension , socket, screwdriver holding the alt pulley and check. Feel in the vanes for plastic bag or rag, etc.
_________________
2276 IDA's 86C 11-1 DD

Joel · Posted: Mon Feb 25, 2013 6:24 pm Post subject:

The old mans engine does that whenever the carb to manifold bolts get abit loose
Its an old twin throat weber DCN, very hard to get at the bolts to tighten them up.

bsairhead · Posted: Mon Feb 25, 2013 6:30 pm Post subject:

I assume it's a type 1 engine. Pull the belt and run it (for less than a minute) and see if the noise goes away. If it does it's either the fan or the alternator or the belt itself.

volkyoo · Posted: Mon Feb 25, 2013 7:04 pm Post subject:

Thanks for the advices!
the car has dual idf,s , i could check tha too! ill take the alt belt out and check!

VWNut_69 · Posted: Mon Feb 25, 2013 7:55 pm Post subject:

Hmm, carbs out of synch? Vacuum leaks?

Mike

nextgen · Posted: Mon Feb 25, 2013 8:43 pm Post subject:

Another trick is to use a 2 foot length of hose, I like garden hose. Use it to isolate the sound. Works great, but stay away from carb intake or you can have your ear drum sucked out. Really big engine will suck your brain out. Putting that in perspective, can be a really big problem and noise problem will not be so important, or on your mind, pun.

Serious the hose works.
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volkyoo · Posted: Tue Feb 26, 2013 8:14 am Post subject:

WELL
this is what i found, started the engine without the alt belt as suggested, and no noises, when i checked the alt pulley and tried to move by hand i noticed a litle freeplay but not ath the fan fan part but at the pulley end, when i dissasembled it i found that the part in the shaft (where the woodruf key goes) was a litel bit enhanced the woodruff key has a bit of free play , so Rolling Eyes

what can i do now?
i guess the goose was hiding there , between the pulley and the alt cause i started the engine and was no noise!

jfats808 · Posted: Tue Feb 26, 2013 9:42 am Post subject:

If the wooddruff key is the part that rounded off and took damage and not the slot on the alt shaft, then your in luck. All u need is a replacement key and pulley. I dont know if they sell an oversize woodruff key, but its possible u may need to have one made after u clean up the rounded slot if theres damage there.
_________________
2276 IDA's 86C 11-1 DD

volkyoo · Posted: Tue Feb 26, 2013 10:03 am Post subject:

The woodruff key looks ok , the slot is the one that looks big, i think i need an oversize woodrif key!
does anybody knows about an oversize one?

fred69vert · Posted: Tue Feb 26, 2013 10:34 am Post subject:

What are you running for the alternator pulley? I've had the pretty chrome pulleys, both EMPI and SCAT and had problems with both. It's the way they are made.

The inner half has a center that is like a circle with two sides cut off straight. The outer half has a corresponding opening. This is the only thing that keeps the two halves from spinning against each other. Well, the hole on the outer half gets "wallowed" out and allows it to spin, which loosens the nut and therefore the entire pulley.

The stock pulley, on the other hand, has a pair of tabs and slots in the two halves that prevent that problem.

Another example of "chrome won't get you home."
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volkyoo · Posted: Wed Feb 27, 2013 9:46 am Post subject:

Well time for another UPDATE!
I found the real culprit! while i was removing the alternator y notice that the fan was a litle bit loose, y tried to remove with my hands and couldnt, and tried with a plier just to see how much torque it had and the nut was almost finger tight! Shocked

i removed and inspected the nut and the nut it shot , the inside part!
so i need another fan nut! and im gonna try it with a new one!

jfats808 · Posted: Wed Feb 27, 2013 9:55 am Post subject:

Glad you found it. Youll have to ensure that your fan shaft slot on the fan isnt rounded. If you have good feel, you can tell with the nut finger tight. A new hub fan nut and washer kit is like 10 bucks. A replacement fan is about 20$. This time, use blue locktight and torque it to 42 lbs.
_________________
2276 IDA's 86C 11-1 DD

volkyoo · Posted: Wed Feb 27, 2013 10:10 am Post subject:

Thanks Jfats!
i dont know how that happend but the fan looks ok, and the slot it,s tight, just the nut, i keep an ear in the engine and at any sign/sound weird im lookim at it!
i gonna try with another one to see how it feels!


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