I believe the earlier (steel) pushrod tubes were a press fit. The later
aluminum tubes had to be expanded, much like with an exhaust pipe
fitting.
Otherwise, the aluminum tubes would fall out...
Keith Edwards, who had very leaky aluminum pushrod tubes, once the head
was machined
Suffolk, VA
4.5 TRs
TeriAnn Wakeman wrote:
>
> >
> >Working on refurbing the head, and the pushrod tubes are just a bit
> >rustier than
> >I'd like, so I'm wondering:
> >
> >a) what seals them at the top and bottom?
>
> I think they are just a very tight pressure fit.
>
> >b) anyone ever replace them with something fancy, like chrome or stainless
> >steel?
>
> Yes the Factory did for the last of the TR4A heads. THey used aluminum.
> ALuminum expands more when hot making for an even tighter fit to keep oil
> from leaking.
>
>
> TeriAnn
> http://www.overlander.net
>
> The world's most complete set of links connecting Rover 4X4 owners
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