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OIF Air Filter Installation
#824823 09/26/20 2:36 am
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I am trying to install the air filters on my 76 Bonneville. When installed the side cover seems to be out too far, like about a quarter of an inch or more from the rear side cover. I would think that the filters are not inline with their grooves which causes this. Can anyone offer some advice?

Thank you in advance.

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Re: OIF Air Filter Installation
mrcarb #824840 09/26/20 7:11 am
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Got a photo?


Now let’s all have a beer beerchug

68’ A65 Lightning “clubman”
71’ A65 823 Thunderbolt (undergoing restoration)
67’ D10 sportsman (undergoing restoration)
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Re: OIF Air Filter Installation
mrcarb #824849 09/26/20 10:32 am
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Originally Posted by mrcarb
When installed the side cover seems to be out too far, like about a quarter of an inch or more from the rear side cover. I would think that the filters are not inline with their grooves which causes this. Can anyone offer some advice?


Without more detailed information or pictures then it appears to be yet another of those questions where the person asking would seem to be best placed to know the answer, but there wouldn't normally be a 1/4"+ step between the two covers.

Re: OIF Air Filter Installation
mrcarb #824873 09/26/20 2:08 pm
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Have you tried the fitting without filters?
Are the filters a good replacement part or a bargain eBay special?
Are they the correct way around?

Re: OIF Air Filter Installation
mrcarb #824884 09/26/20 4:29 pm
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Yes I have tried fitting them without the filters and they fit fine, even with the rubber hose connector to the carb. There really is only one way they fit to the outer cover albeit that it can be upside down because of the window in the sheet metal. I guess that I will go back to the wrestling match.

Thank you all for your replies.

Re: OIF Air Filter Installation
mrcarb #824887 09/26/20 5:06 pm
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You have the trumpet aiming downwards don’t you?

Have you tried fitting them without the trumpet air ducts attached?

Last edited by Allan G; 09/26/20 5:09 pm.

Now let’s all have a beer beerchug

68’ A65 Lightning “clubman”
71’ A65 823 Thunderbolt (undergoing restoration)
67’ D10 sportsman (undergoing restoration)
68’ D14 trials (undergoing transformation)

Re: OIF Air Filter Installation
Allan G #824892 09/26/20 6:06 pm
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Originally Posted by Allan G
You have the trumpet aiming downwards don’t you?

Have you tried fitting them without the trumpet air ducts attached?


Unelss it's a late '76 model then it might not have had them as it would have had filters with the round hole and no air intake tubes were listed for '76.

https://www.thunderbirdspares.com/air-filter-pair-triumph-t140tr7-1973-1976-60-3618-271-p.asp

https://www.thunderbirdspares.com/air-filter-pair-triumph-t140tr7tsstsx-1976-85-60-4265-272-p.asp

Last edited by L.A.B.; 09/26/20 6:10 pm.
1 member likes this: Allan G
Re: OIF Air Filter Installation
mrcarb #824893 09/26/20 6:34 pm
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Hi mrcarb, So this would mean the sealing area around perimeter of plastic cover to alloy would have a gap also. ??

If I get a chance I'll measure how thick the filter is on my '73 Tiger which is same filter. Original from new. I'll try to do that later today or by tomorrow night.

I know from personal experience on 650 round filters the aftermarket elements vary a lot in thickness. A good 1/4". Which obviously makes for a poor fit.

Gave up & spent the $ for genuine. They are still made new by original makers for Triumph in 70s. So far as I can tell the only ones that actually fit properly. They are washable & last for years.

http://www.copwash.co.uk/

Above is the maker. Various sellers in USA sell them. Call or email seller & ask who is maker.

Not only that, but other makes can/will skew mixture. After months of chasing my tail, I learned a hard lesson on this.

The plastic outer cover is flimsy & distorts easily. The retainer nut should have a special lock washer that sort of looks like spring. Just snug the nut, not tightened like a normal nut at all. If cover is very distorted you may need new ones. Metal repro covers have been reported for sale. I've never been able to find any. I think it's a myth. The early covers fit, but don't look right.
Don


1973 Tiger 750
Re: OIF Air Filter Installation
mrcarb #824901 09/26/20 8:30 pm
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According to the 76 parts book the filters have a square hole in the sheet metal, and the filters that I bought have a square hole, and are made in England. My air ducts, both left and right, are in the bottom square hole.

Re: OIF Air Filter Installation
mrcarb #824902 09/26/20 8:36 pm
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The new filters are the same size and thickness as the old filters. There is a wave type washer under the nut that fastens the plastic side cover.

Thank you for the replies.

Re: OIF Air Filter Installation
mrcarb #824907 09/26/20 9:14 pm
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Originally Posted by mrcarb
According to the 76 parts book the filters have a square hole in the sheet metal, and the filters that I bought have a square hole, and are made in England. My air ducts, both left and right, are in the bottom square hole.


According to the early '76 parts book the filters are 60-3618 which have the circular hole...
http://www.tioc.org/partsbookstriumph/pb-tri-1976-T140-early%2099-2257.pdf

...and 60-4265 with rectangular hole (with LH and RH air intake tubes) in the '76-'77 book, however, both filters are the same size..
http://www.tioc.org/partsbookstriumph/pb-tri-1976-77-T140%2099-2257R.pdf

The filter illustration is the same for both books, neither of which shows a hole, also the clip is not used with the backplate filters.

[Linked Image from i.postimg.cc]


[Linked Image from i.postimg.cc]

[Linked Image from i.postimg.cc]

[Linked Image from i.postimg.cc]

[Linked Image from i.postimg.cc]

Re: OIF Air Filter Installation
mrcarb #824914 09/26/20 11:08 pm
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I am in awe of the images and accompanying data that LAB consistently provides.

Truly a font. Surprised you’re not a mod, but I can appreciate why you might not wish to be.

Good stuff.

Re: OIF Air Filter Installation
koan58 #824918 09/26/20 11:15 pm
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Have to share this respect for LAB -has helped me quite a bit .


1978 Bonneville T140V PX
Re: OIF Air Filter Installation
JBMorris #825082 09/28/20 6:11 pm
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Originally Posted by JBMorris
Have to share this respect for LAB -has helped me quite a bit .

+1 very helpful understanding bloke thumbsup


Always remember there are 3 kinds of people in this world,those that can count & those that can't.
T140V 1974
GT750 1974
GT550 1974
TL1000 97s
Re: OIF Air Filter Installation
mrcarb #825084 09/28/20 6:21 pm
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Same here, a god few times with Trident problems.

Re: OIF Air Filter Installation
mrcarb #825122 09/29/20 1:15 am
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...L.A.B is just an institution regarding stock bikes parts.

Re: OIF Air Filter Installation
mrcarb #825180 09/29/20 5:38 pm
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Thanks For photos L.A.B.. The pictures show the front side cover to be flush with the rear side cover. My front side covers are about 1/4" out compared to the rear.

Re: OIF Air Filter Installation
mrcarb #825209 09/29/20 9:33 pm
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Hi mrcarb, I took my covers off. The original from new filter element is 1-11/32" thick.

Are you saying without elements the cover fits flush to rear triangle?

When installing element the cover is being held out by element?

This would mean you have gap around edges of cover, so element would not have effect as the cover must be air tight all the way around as well as both sides of element need to be air tight as well.

The element will only fit properly one way. The tin inside filter will go against the speed nut that holds the bolt in place. The filter hollow is facing to outside.

On my bike the filter fits air box rectangle snugly enough to stay on. It also fits snugly on rectangle in cover. I place filter on air box. Slide cover over bolt carefully to stay very straight such it doesn't knock off filter from air box. I hold in place until the nut is secured.

On removal the filters always stick to the cover side. If I attempt to install with filter stuck to cover, I have very hard time getting filter to fit over inner rectangle. Was just fooling around with that & experimenting. On my bike I must place filter on air box. Then cover goes on fine.
Don

Last edited by TR7RVMan; 09/29/20 9:34 pm. Reason: changed sentence

1973 Tiger 750
Re: OIF Air Filter Installation
mrcarb #825302 09/30/20 11:46 pm
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Test fit the plastic lid without the filter, I have a couple that have shrunk and dont fit around the rim properly.


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56 Norbsa 68 Longstroke A65
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