Author Topic: Engine to Frame Clearence 59 A7SS w/Photo  (Read 339 times)

Offline Peter Gee

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Engine to Frame Clearence 59 A7SS w/Photo
« on: 19.01. 2018 14:21 »
Wondering about extremely small engine to fame clearance at point shown of .025".

This lower frame member was creased badly  on the TS lower rail halfway along to the cross member from the previous owner running over a very huge rock.

I had it replaced with a section of a C12 swinging arm and plugs, very nicely done by a local engineer who turned plugs to accept the new end and sweat brazed it and was careful to note that all of the thru frame bolts for the dyno holder and engine plate bots were perfectly aligned- in fact they still are, the engine went in very easy..but, oh, such tiny clearance!

Does anyone have their own measurement of what it should be

But maybe I am all wrong and will have to dismantle and get the frame jig checked?

Comments awaited with tRepidation

https://images2.imgbox.com/6c/93/RDnsfgj3_o.jpg

https://images2.imgbox.com/f9/e9/ArucMFYx_o.jpg

Am now thinking the old rock damage/impact might have slightly bent the frame rail  cross member up on the TS side of impact?

adm edit: removed img tags to external hosting, added pictures as forum upload.
See rules for picture posting > https://www.a7a10.net/forum/index.php?topic=2545.0
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Offline duTch

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Re: Engine to Frame Clearence 59 A7SS w/Photo
« Reply #1 on: 19.01. 2018 15:19 »

 
Quote
.....awaited with tepidation.....
  *conf*    .....you want a slightly warmer than luke-warm comment ?   

 What's that bit of junk hanging down causing trouble anyway ??

 I think you meant 'Trepidation'  .... *smile*
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Started building in about 1977/8 a on average '52 A10 -built from bits 'n pieces never resto intended -maybe 'personalised'
Have a '74 850T Moto Guzzi since '92-best thing I ever bought doesn't need a kickstart 'cos it bump starts sooooooooo(mostly) easy
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Offline coater87

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Re: Engine to Frame Clearence 59 A7SS w/Photo
« Reply #2 on: 20.01. 2018 11:32 »
I agree,

 What is that little dangler under there? *conf*
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Central Wisconsin in the U.S.

Online bikerbob

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Re: Engine to Frame Clearence 59 A7SS w/Photo
« Reply #3 on: 20.01. 2018 14:41 »
That does look to be a bit  strange but there is part of the casing protruding at that point I have just checked on my bike and the gap is about 1/4" are you sure you have .025 and not .25 as .25 would be correct
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Online JulianS

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Re: Engine to Frame Clearence 59 A7SS w/Photo
« Reply #4 on: 20.01. 2018 15:57 »
Gap on mine about the same as bikerbob.

I suggest fit the front engine plates to cases and see how all the holes line up when cases offered up.
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Offline Peter Gee

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Re: Engine to Frame Clearence 59 A7SS w/Photo
« Reply #5 on: 20.01. 2018 17:04 »
Dear Julian S and other kind suggesters,

(a) Gosh, all BSA A7SS have this
dangly bit, surely cast in to allow oil pump drillways that are then plugged?

(b)  Yes I think it should be 1/4  and you confirm my suspicions that when the lower frame rail repair was made, tho it was a very good job, the cross member arm on the DS had been slightly "gull winged" upwards so that when the replacement lower rail section was added, it was brought closer to the  engline a tad.

However, I fitted all the engine and brearbox bolts today with the cases in place and  they all went with very little problem ( bit of wiggling and jiggling like any pre-unit), right down to the dyno holding front.  So I think I'll leave it as is?

Cheers

Peter G
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