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 kickatinalong
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| posted on July 7th, 2004 at 07:13 PM |
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Noisy fan shroud
I have a 70 bug and it has a 1300 motor. I have two problems I hope some one can shed some light on.
1. I recently changed the fan belt and tensioned to the right tension. When driving it recently a grating noise came out of the fan shroud along with
a slight burning / rubber smell. I loosened it some more and it ran well for a week but the problem resurfaced this morning. Both times it happened
it rained during the night.
2. After the car is warmed up I stop at lights the generator light goes on but dimly. , when I dab on the accelerator it goes off but reoccurs again
when I stop again.
The engine idle goes way down when this happens.
Any suggestions.
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68AutoBug
A.k.a.: Lee Noonan
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| posted on July 7th, 2004 at 07:34 PM |
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Sounds like Your Generator bearings are starting to seize...
and there is too much friction for the fan belt to turn the generator... overheating and wearing the belt..... and even slowing the engine down....
and the fan Not cooling the engine like it should be....
the bearings used in the generator are not expensive....
so a trip to an Auto Electrician is needed URGENTLY..
or obtain another generator...
You have been lucky the bearing hasn't just seized up and stopped the fan and broke the belt and then overheated the engine... The generator light
also tells You whether the Fan is cooling the engine down... Lucky its winter and not summer.... I wouldn't keep driving the car, apart from taking
it to a repair shop or auto electrician... I believe Your generator is still OK at the moment.. probably only one of the bearings on the way out..
but it would be getting very hot...
Best of Luck...
Lee
[Edited on 7-7-2004 by 68AutoBug]
- [size=4]Helping keep Air Cooled VWs on the road - location: SCONE in the Upper Hunter Valley - Northern NSW 320 kms NNW of SYDNEY--- [/size]
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kickatinalong
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| posted on July 7th, 2004 at 10:14 PM |
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Thanks for the input.
The generator is very cool so it doesn't seem to be a bearing issue. I will take it to the Auto electrician and have it assessed.
By the way I had a problem a while back regarding the bug not starting and you suggested that the generator or converter may be bad. When I had the
car passed for rego here in Vic it appears the neutral cable was attached to the positive by mistake thus the problem. We do not know who was
responsible but the Auto Elec guy just laughed. It took him 3 minutes to fix the problem. He stated that you needed to have a good knowledge of this
problem and that most would overlook it.
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68AutoBug
A.k.a.: Lee Noonan
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| posted on July 8th, 2004 at 12:23 AM |
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Hi,
Having a cable the wrong way round is very rare....
I would never mention that, as its rarely done....
I thought Never !! 
I always start with a vehicle in good correct going order....
and then try to find the fault....
When I say the bearing would get very hot, as the bearings are only very small the heat output would be small also... plus the generator would be
acting like a heatsink... taking the heat and cooling it down....
I could say that the fan is rubbing on the fan housing and causing the problem, but I have never heard of this, unless a bearing is faulty... worn..
seized etc... or someone has had the fan off and bent it, they are very easy to bend... or the fan has cracked due to metal fatigue...
The inner fan pulley may be rubbing on the end of the generator... but they don't normally, unless someone has tampered with it... so lots of things
can happen... that shouldn't.....
removing the fan is the easiest way to take the generator off the engine....
Let Me know what the problem was... I like learning!!
Lee --
- [size=4]Helping keep Air Cooled VWs on the road - location: SCONE in the Upper Hunter Valley - Northern NSW 320 kms NNW of SYDNEY--- [/size]
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Che Castro
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| posted on July 8th, 2004 at 09:03 AM |
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this is a bit left but,
check to see that the engine oil pressure switch isnt accidentally wired to the generator light. Disconnect the spade at the engine that goes into
the actual switch and turn the ignition on and whichever light is out is teh one it is wired to.
Jon
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MickH
A.k.a.: Michael Hutchinson
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| posted on July 8th, 2004 at 09:07 AM |
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| Quote: | Originally
posted by Che Castro
this is a bit left but,
check to see that the engine oil pressure switch isnt accidentally wired to the generator light. Disconnect the spade at the engine that goes into
the actual switch and turn the ignition on and whichever light is out is teh one it is wired to.
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HUH??????????????????:alien
tssnq.com.au
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kickatinalong
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| posted on July 8th, 2004 at 04:50 PM |
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I drove the car this morning and about 5 miniutes out the noise came in. I stopped waited 5 minutes and started again. The noise was gone. I drove
another 5 minutes and it came back. This afternoon I started it again. No problems, no noise.It just purred along. I tried to move the shroud to see
if it was loose but no movement and no noise.I took the bug to the Auto Elec who diagnosed the first problem and initially thought it must be the rear
generaator bearing as he felt it may have perished lost grease or aged. But when I arrived he really didn't know what to do.
I have adjusted the idle a bit so when I am stationery the revs are a little higher and that seems to have sorted out the generator light issue at
idle.
I will have the elec diagnose the isues and see what he comes up with.
Any comments??? I will keep you posted.
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68AutoBug
A.k.a.: Lee Noonan
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| posted on July 12th, 2004 at 09:42 AM |
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There wouldn't be any play in the fan shroud... but even the fan itself probably wouldn't show any play because of the fan belt tension on it...
With the fan belt off... and spinning the fan, You may be able to hear something...
really depends on the bearing... If it was a larger bearing and had worn out You would really be able to see the wobble of the fan pulley, but I
suppose they use small bearings as they cannot do much damage when they fail...
Hardest thing is to remove the generator.... from the engine..
about 100 times harder than on a normal?? engine...
Lee
- [size=4]Helping keep Air Cooled VWs on the road - location: SCONE in the Upper Hunter Valley - Northern NSW 320 kms NNW of SYDNEY--- [/size]
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Che Castro
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| posted on July 12th, 2004 at 10:24 AM |
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when i first got my car the oil light switch was wired to the generator light in the speedo and vice versa. The "generator light" came on at idle
and went away when you revved it. I thought it was a problem with the genny. Turned out the engine had low oil pressure
Jon
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kickatinalong
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| posted on July 14th, 2004 at 01:40 PM |
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Driven the car every day since the problem arose. It seems to have fixed itself. The auto elec couldn't find anything wrong. Said he should remove it
though just to check it out and charge me bucks for the priviledge. The generator is fine and it is running as it ought. There is no unusual movement
in the bearings and everthing appears as it should.
Just for yor info when it did grind I took the belt off and turned the generator with a wrench and you could hear the chaffing sound on the shroud. I
would move the shroud at the top and it would go away and come back if I moved it too far.
The preovious owner remembers having a similar problem when a mechanic checked out the fan and didn't put the shroud on properly. That was two years
ago and they haven't had a problem with it since then.
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68AutoBug
A.k.a.: Lee Noonan
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| posted on July 15th, 2004 at 12:22 AM |
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Looks like the fan shroud was touching the fan.....
You cannot move My fan shroud... its screwed down tight..
along with the alternator strap etc...
Maybe the fan is slightly bent...
they are very easy to bend too...
there is NOT much clearance there...
plus having the fan belt tight shouldn't move the fan housing either....
At least You know the Generator bearings are OK...
Lee --
- [size=4]Helping keep Air Cooled VWs on the road - location: SCONE in the Upper Hunter Valley - Northern NSW 320 kms NNW of SYDNEY--- [/size]
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