Posted 24 October 2020 - 10:32 PM
My 1275 engine had new cam followers installed in 1987 but not pushrods following a rebore and crankshaft grind. The car has completed 17k miles since the re-build.
I have a re-built head and new rocker assembly to be fitted. The existing pushrods have dimples on the follower ends.
Is it ok to use the existing pushrods? Will new ones be worse?
Posted 25 October 2020 - 07:15 AM
Posted 25 October 2020 - 09:08 AM
Posted 25 October 2020 - 10:13 AM
Dont the tops of the followers have holes in them?if the dimples are as large as the holes(3/16?)I would replace them as the hardening may have failed,if smaller I would reuse them.Might be useful to carefully clean these holes with something suitable,I used cloth wrapped around a meat skewer..there was a surprising amount of rubbish in there.Good luck,Steve..
Posted 25 October 2020 - 08:11 PM
I happily and routinely grind 'Pips' like those off. I find on engines that have done around 30 000 miles or more, they will have a Pip. Being what they are, they are going to wear. They are a little on the hard side, but not super hard. Des Hamil in his Books on the A Series Engine goes in to some detail as to how he grinds them and if the hardening has gone or he's shortened them, how he re-hardens them.
The later Pushrods were made by a Forging Method, I can't recall what grade of Steel they are in, but it does respond reasonable well to being hardened. The forged types are easily recognisable as on the upper end, they appear to have a 'seem' on them.
Posted 25 October 2020 - 09:05 PM
Posted 25 October 2020 - 09:12 PM
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