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Tim Luffingham
United Kingdom
342 Posts |
 Posted - 04/11/2020 : 16:30:53
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Wanted two front trunnions boxes for an N type. If not available to buy does anyone have them to copy?
Many thanks
Tim |
Edited by - Tim Luffingham on 09/11/2020 15:29:59 |
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Cymber
United Kingdom
966 Posts |
Posted - 09/11/2020 : 21:56:29
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When I restored my PA which had very worn trunnion boxes I bored them oversize and made oversize inserts. I'll give you the details if you have to go down that road.
Maurice. |
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Tim Luffingham
United Kingdom
342 Posts |
Posted - 10/11/2020 : 11:16:48
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Maurice, that's kind of you and a good suggestion. Unfortunately I don't have the trunnion boxes to start with. They are missing form a barn find N type that I hope to restore.
To be honest I'm not sure if I am to copy whether these would be machined from a billet or cast. Does anyone have any thoughts?
Are the K type trunnion boxes an exact match I wonder?
Tim |
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mgmog
United Kingdom
469 Posts |
Posted - 10/11/2020 : 11:59:30
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A search of the archives suggests Andy King has casting moulds to make the boxes, also Tom Dark has made some in the past ....
Rich Stott
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coracle
United Kingdom
1970 Posts |
Posted - 10/11/2020 : 12:53:08
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Tim, Machining from billet would not really be practical as they are a complex shape.
I have a pair about to be bolted to a P chassis; I assume but am not sure that they are common to the N type. They were said by the vendor to have come from Tom Dark.
I suggest you talk to Tom but in the mean time I will not bolt mine to the chassis for now in case you need to borrow them.
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Westbury
United Kingdom
2044 Posts |
Posted - 10/11/2020 : 13:35:16
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Tim and Nigel.
The P type ones are definitely too small . I got my K type ones from Ron Grant who made the patterns.I’ll check against the N type ones, but I have a feeling they are different.
Chris |
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Westbury
United Kingdom
2044 Posts |
Posted - 10/11/2020 : 14:02:36
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Tim, further to above, I have checked the two boxes, very difficult to measure in situ, the spring width is the same but the two mounting bolts underneath are different lengths apart. Looks like 3.1/4” on the N type 3.1/2” on the K type. On the trunnion boxes there are five bolts on the side cover on the K type, four on the N type. I would be inclined to wait until some originals turn up.
Hope that is of some help.
Chris |
Edited by - Westbury on 10/11/2020 14:04:18 |
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coracle
United Kingdom
1970 Posts |
Posted - 10/11/2020 : 16:10:05
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Yes, the P ones are much smaller, only 2.5/8 bolt spacing; apologies for the false hope.
The photo's do however, give an idea of the complexity of shape that would make machining from solid quite a challenge. |
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Ian Bowers
United Kingdom
948 Posts |
Posted - 10/11/2020 : 16:16:43
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It would not be an unreasonable piece for spark erosion machining.
Ian Bowers
OD 6791
J3 3772 |
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George Eagle
United Kingdom
3244 Posts |
Posted - 10/11/2020 : 16:32:25
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Hi Tim
The N boxes are unique to the N types and they have larger trunnion bearings than the 4 cylinder cars. Even the covers are different as strangely they have fewer bolts to secure them.
George
ex NA0960. |
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Tim Luffingham
United Kingdom
342 Posts |
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Phil Standish
United Kingdom
102 Posts |
Posted - 10/11/2020 : 19:37:40
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Tim I have emailed you directly
Kind regards
Phil |
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