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> Clonking... knackered bushes?
webmonster
post 13 Dec 2014, 23:53
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The Guzzler has recently developed a clonking at the front end somewhere.

It appears that ACH4039 bushes on each side might be knackered and allowing some metal-on-metal contact. What thinks ye all?
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webmonster
post 14 Dec 2014, 03:25
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Off with the wheel and had a look at the bushes. Sure enough the hole is off-centre.
I've ordered a set of replacement ACH4039's, but in the meantime I thought I would try an experiment and turn the bushes 180 degrees. I marked the original positions with a Vivid marker, did everything up and went for a test drive.
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A bit more clearance:
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...but I've still got the clonk.
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Danny
post 14 Dec 2014, 10:21
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According to my records you only did those bushes in April 2011 or so (IMG:style_emoticons/default/mellow.gif)

When does the clonking occur, Braking, cornering, just bouncing up & down whatever?

Danny

This post has been edited by Danny: 14 Dec 2014, 10:25
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MYKE
post 14 Dec 2014, 22:07
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I sounds to me like you have trunnion trouble here. The threads in the trunnion wear out and if left, will lift away from the swivel pin end.
If the Isis is anything like the Minor (And it looks the same), the trunnion will only lift out at slow speed, as you accellerate from a stand still in either first or reverse.
It's more an embarrassment than dangerous and leaves you with one wheel laid flat on the road. The answer is regular greasing. The threads on the swivel pin seem to be much harder than the trunnion, so it's more likely you need trunnions than swivel pins.
It is a serious problem but the good news is I've never known one to pop out at speeds of over a crawl, always as you set off in first or reverse.

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webmonster
post 16 Dec 2014, 22:04
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QUOTE (MYKE @ 15 Dec 2014, 11:07 ) *
I sounds to me like you have trunnion trouble here. The threads in the trunnion wear out and if left, will lift away from the swivel pin end.
If the Isis is anything like the Minor (And it looks the same), the trunnion will only lift out at slow speed, as you accellerate from a stand still in either first or reverse.
It's more an embarrassment than dangerous and leaves you with one wheel laid flat on the road. The answer is regular greasing. The threads on the swivel pin seem to be much harder than the trunnion, so it's more likely you need trunnions than swivel pins.
It is a serious problem but the good news is I've never known one to pop out at speeds of over a crawl, always as you set off in first or reverse.

The top links both seem solid - I could not wobble them at all when I had them disconnected from the top suspension bit.

As for the bottom links... I had replaced RH front a few years ago. Better not be this one (IMG:style_emoticons/default/angry.gif)

I have asked my mechanic if I can bring him the car tomorrow for his opinion. If something is potentially wrong with steering or suspension I want to know asap for safety's sake.

It is regularly greased usually before 1000 miles with the weight off the front wheels. Previous owners may not have been so kind...

Yes, Oxford/Isis suspension looks pretty similar to the Minor - biggest difference seems to be telescopic shocks and location of top link.
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MYKE
post 17 Dec 2014, 10:01
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I pump as much grease as possible into mine twice a year, usually at the beginning and end of the season but it's still no guarantee that it won't happen. The only other suggestion I can make is to check the inner mountings. The bushes and the pins on the end of the torsion bars. These do wear, and are very rarely checked. I have even known a lower radius arm to crack and remain un noticed until it finally collapsed on a dark wet night, but I think your problem is metal to metal contact somewhere. Hope you find it soon.

MYKE.
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webmonster
post 23 Dec 2014, 05:20
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Oy doesn't appear to be anything to do with the steering. Links and swivels are all tight. The search continues. ..
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matthew.h
post 23 Dec 2014, 07:51
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Do it make an even sound or random one?
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Danny
post 23 Dec 2014, 09:50
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QUOTE
The search continues. ..


Biscuit tin knocking against the thermos?

Danny
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webmonster
post 24 Dec 2014, 03:39
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QUOTE (matthew.h @ 23 Dec 2014, 20:51 ) *
Do it make an even sound or random one?

It's a random sound. Some bumps make it happen and other bumps don't. Reversing down a bumpy drive way made it happen handsomely the other day.
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Llansadwrn
post 24 Dec 2014, 03:55
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QUOTE (webmonster @ 23 Dec 2014, 20:39 ) *
It's a random sound. Some bumps make it happen and other bumps don't. Reversing down a bumpy drive way made it happen handsomely the other day.


Rear suspension? Hangers, bushes, clamps, clips?
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webmonster
post 24 Dec 2014, 04:38
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QUOTE (Danny @ 23 Dec 2014, 22:50 ) *
Biscuit tin knocking against the thermos?

It would be nice if it was that easy.
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matthew.h
post 25 Dec 2014, 04:57
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Sound like the exhaust is moving to much
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webmonster
post 30 Dec 2014, 05:15
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Fingers crossed, I might have located the culprit.

There is a stay which helps to hold everything in place under braking and when I twist the RH one the noise stopped, so I am going to try and tighten it.

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Betsy
post 30 Dec 2014, 11:19
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Not sure the layout of your car but I have a 16/60 and had an intermittent knock like yours. It drove me mad but in the end I found it and it was the alternator knocking on the steering box. This was due to 2 things the belt had stretched over time and adjustments had lowered the alternator with adjustment and the engine mounts had relaxed a tad and made the engine a bit lower resulting in about a 5 mm clearance between alternator and steering box, and under certain conditions they touched hence the knock. Hope this will help someone.

HAPPY NEW YEAR ALL
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webmonster
post 2 Jan 2015, 23:11
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QUOTE (Betsy @ 31 Dec 2014, 00:19 ) *
Not sure the layout of your car but I have a 16/60 and had an intermittent knock like yours. It drove me mad but in the end I found it and it was the alternator knocking on the steering box. This was due to 2 things the belt had stretched over time and adjustments had lowered the alternator with adjustment and the engine mounts had relaxed a tad and made the engine a bit lower resulting in about a 5 mm clearance between alternator and steering box, and under certain conditions they touched hence the knock. Hope this will help someone.

HAPPY NEW YEAR ALL

Yes, unexpected things can cause clonks etc (IMG:style_emoticons/default/coffee.gif)
I'll have a go at tightening the stay bar first and see what happens. This will be a week or so away because I am tootling around in the Morris Cowley for the next few days (IMG:style_emoticons/default/smile.gif)
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webmonster
post 11 Jan 2015, 07:11
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No clonk (IMG:style_emoticons/default/smile.gif)

Tightening the stay rod did the trick. I had to remove a castellated nut to do this and compress the rubber bushes a little. I also noticed that the lock nut for adjustment for the rod's length was at the wrong end of its travel, so the length may well be a bit wrong now.

There is a front bush suspension squeak starting though :|
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Llansadwrn
post 11 Jan 2015, 12:49
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QUOTE (webmonster @ 11 Jan 2015, 00:11 ) *
No clonk (IMG:style_emoticons/default/smile.gif)

Tightening the stay rod did the trick. ....

There is a front bush suspension squeak starting though :|


..... that's 'cos you tightened the stay rod (IMG:style_emoticons/default/laugh.gif) ....... just kidding, well done! It'll be as quiet as a Roller soon.
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Penguin45
post 11 Jan 2015, 13:14
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(IMG:http://i788.photobucket.com/albums/yy164/Landcrabsadmin1/mousetrap_zpsb671cf70.jpg)

Should do the trick.

P45.
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Danny
post 11 Jan 2015, 15:36
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there must be a better one than that around.

Danny
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