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> Accelerator linkage bush and grommet, Cross reference with 4/44 and Magnette
webmonster
post 7 Oct 2017, 09:32
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On the Isis the throttle shaft from the firewall to the SU(s) sits in a bronze bush (ACH9004) and that is held by a rubber grommet (RG105).

I've seen a reference to this bronze bush on a 4/44. Is it the same on a ZA or ZB Magnette? Do any other vehicles use this bush?
I am not sure if the 4/44 or Magnette use the rubber grommet RG105.

Is anyone in a position to check?

My Isis has never had the bronze bush and the rubber bush is some modified Honda bush from 20 years ago and I can't remember what it is!
I would prefer to source the correct items if possible.
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Danny
post 7 Oct 2017, 12:47
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Attached File  Throttle_Shaft.jpg ( 29.98K ) Number of downloads: 0


I pinched this off a Magnette forum, I don't have my MG parts book here ATM so don't know the PN. If the same, a Magnette fellow in UK, Peter Martin, supplies them to great acclaim.

The 6/90 uses your part numbers too. I am currently looking for my 4/44 parts book! The 05 in the grommet part number implies 5/16" ID I believe, I bet those rods are all the same diameter.

EDIT: I can confirm that 4/44 part numbers are as you posted so Magnette sure to be too? The grommet from Peter Martin is apparently 3/8" ID (doesnt fit over the rod does it duh!) and fits a 5/8" hole.

Danny

This post has been edited by Danny: 8 Oct 2017, 07:45
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webmonster
post 8 Oct 2017, 23:06
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QUOTE (Danny @ 8 Oct 2017, 01:47 ) *
Attached File  Throttle_Shaft.jpg ( 29.98K ) Number of downloads: 0


I pinched this off a Magnette forum, I don't have my MG parts book here ATM so don't know the PN. If the same, a Magnette fellow in UK, Peter Martin, supplies them to great acclaim.

The 6/90 uses your part numbers too. I am currently looking for my 4/44 parts book! The 05 in the grommet part number implies 5/16" ID I believe, I bet those rods are all the same diameter.

EDIT: I can confirm that 4/44 part numbers are as you posted so Magnette sure to be too? The grommet from Peter Martin is apparently 3/8" ID (doesnt fit over the rod does it duh!) and fits a 5/8" hole.

Danny

I've finally had a chance to measure...
My good friend Mr Calipers tells me that the OD of the bush is 18.5mm - that is pretty close to 3/4" isn't it?
And the OD of the shaft is 8mm - 5/16"

...so does that mean the bronze bush is the same on all the cars but the rubber grommet is different on the Magnette?
Shall we ask Peter Martin?
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Danny
post 9 Oct 2017, 01:39
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Attached File  grommet.jpeg ( 58.24K ) Number of downloads: 0


Robert, could you be measuring the grommet in the wrong place? It needs to be measured down between the two sides...the OD of the ID so to speak, where it fits in the sheet metal hole. Could measure the hole in the metal anyway. They have to be fitted upside down apparently!

Danny
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webmonster
post 9 Oct 2017, 03:45
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QUOTE (Danny @ 9 Oct 2017, 14:39 ) *
Robert, could you be measuring the grommet in the wrong place? It needs to be measured down between the two sides...the OD of the ID so to speak, where it fits in the sheet metal hole. Could measure the hole in the metal anyway. They have to be fitted upside down apparently!

I measured the hole in the sheet metal bracket, but both it and the linkage had worn because the grommet and bush must've fallen out many years before I fitted something!
...or I am measuring it wrong.
If your part #'s match up then all must be OK. Except me (IMG:style_emoticons/default/smile.gif)

So... that piccy is of the bush and grommet installed in your 6/90?
Looks great :-)

This post has been edited by webmonster: 9 Oct 2017, 03:46
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Danny
post 9 Oct 2017, 07:33
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QUOTE
So... that piccy is of the bush and grommet installed in your 6/90?


No that is borrowed from the Magnette forum on MG Experience...I don't have anything that shiny under my bonnet!

Danny
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Fred Oldham
post 9 Oct 2017, 13:31
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Mines running a plastic cable gland. Works a treat, costs sod all.
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Darvie43
post 9 Oct 2017, 23:11
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The part numbers in the MG Magnette ZA/ZB parts book are as follows
Grommet RNF 105
Bronze bush 186579
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Darvie43
post 9 Oct 2017, 23:14
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186579 is a Nuffield part #
ACH 9004 is a BMC part #
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Danny
post 10 Oct 2017, 00:28
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QUOTE
Mines running a plastic cable gland. Works a treat, costs sod all.


Fred, is this the type of thing you mean.

Attached File  6_12mm_dia_ip68_waterproof_cable_glands_pk_2ImageMain_515.jpg ( 38.22K ) Number of downloads: 1


Danny
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Fred Oldham
post 10 Oct 2017, 17:14
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Exactly. It looks like a major bodge I know, but it works perfectly.
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Danny
post 5 Nov 2017, 10:54
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I'm doing a few jobs on my fathers 6/90 (SIII Auto) and this was one of the things that has been bugging me. I haven't looked at this linkage business for years but can tell you that no way can that Magnette grommet fit a 6/90 despite the part numbers being the same, the hole in the bracket is 25mm probably an inch. I don't remember seeing one of these that wasn't bodged up in some manner.

So it now has one of Fred's cable glands and it's brilliant, once I worked out how it works, never even knew such a thing existed! It's basically an adjustable grommet.

Thanks Fred.

Danny
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Fred Oldham
post 5 Nov 2017, 16:15
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Afraid I can’t take the credit for it. It was the MG tuning guro that sorted my ignition. He realised that I was only getting half throttle and sussed the reason why. As you say, it works great and costs pennies. I’m only surprised it isn’t a standard fitment!
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Danny
post 6 Nov 2017, 01:50
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I still used a piece of bronze bush (not the original one...can't find one) and clamped this in the gland. I also had to fit the gland sort of back- to- front as the snout was too long for the distance between the bracket and the arm where the balljoint fits on, pic in post #8 (original method).

Danny
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