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740 Trunnion spring Identification and installation
#1
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Peter Packard
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Hello all, My friend Bob Davis is working on a 740 and has hit a snag. Can anyone answer his questions please. His questions below. Thanks... Peter Toet

We are working on a 740 and are at the trunnion spring on rear of front main springs.
The parts book says that there are 2 x p/n 97762 inner spring and 2 x p/n 97763 outer spring for the 7 th series and then the 8th and 9th series reverts to 4 of the same part no.



There is no guide as to the difference between 97762 and 97763- except we have a few loose springs from Peter Boyce ( everything dismantled ) of two different lengths. The units in the trunnion in photo – which could have come off anything appear to be the same length.



Would you think 2 x shorter springs go on the inside or the outside?

Attach file:



jpg  trunnion springs 740.jpg (1,179.67 KB)
154_60656fa627628.jpg 2016X1512 px

Posted on: 4/1 0:53
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Re: 740 Trunnion spring Identification and installation
#2
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Peter Packard
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Hello all, any thoughts on this? David M perhaps. Peter T

Posted on: 4/2 19:19
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Re: 740 Trunnion spring Identification and installation
#3
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DavidM
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Peter,
From memory all 4 trunnion springs were the same size when I assembled that area on my 740, however I suspect that the previous owner (Don) had them made and was probably not aware of any differences. Sorry, not much help.

Posted on: 4/3 1:24
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Re: 740 Trunnion spring Identification and installation
#4
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Peter Packard
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Hello all, Thank you David M, I was hoping that one of the Sages on info,com would chime in on their experiences and recommendations with this.... Never Mind.... My "considered" opinion is that the condition of the roads and the availability of reasonably accurate wheel balancing has improved so much that the trunnion Block "anti shimmy device" is effectively rendered obsolete and that the device could be assembled in pretty well any order. I would assemble this trunnion with two short springs on the inner and two long springs on the outer. You are of course able to alter this at any time. Best Regards , Peter Toet.

Posted on: 4/3 1:32
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Re: 740 Trunnion spring Identification and installation
#5
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John
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So what was the purpose of these "trunnions"?? Never seen anything like that before.
John

Posted on: 4/3 18:08
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