Page 1 of 1
Rocker shaft
Posted: Thu Nov 07, 2024 5:50 pm
by rich112
Can anyone identify my rocker shaft?
Its got Volvo rockers on it, so I assumed it was Volvo too, but having got a new Volvo shaft, they appear to be different.
It's 21.92mm dia so this is thicker than a stock Rover shaft isn't it? I read somewhere that Rover rocker shafts are 20.50mm dia?
If anyone can confirm the diameter of a stock Rover V8 rocker shaft that would be great. If anyone can identify the bottom shaft in the photos, that would also be great!
Re: Rocker shaft
Posted: Mon Nov 11, 2024 11:21 am
by SuperV8
I measured my rockers and shafts here:
http://www.v8forum.co.uk/forum/viewtopi ... c&start=15
My measurements: in mm.
After market-
rocker 602154 = 20.62
rocker 602153 = 20.67
shaft 1 = 20.50
shaft 2 = 20.51
Used OE-
rocker HRC 1050 23A = 20.61 horizontal (20.64 vertical)
rocker HRC 1050 24A = 20.62 horizontal (20.65 vertical)
shaft 1 = 20.53 horizontal (20.49 vertical)
shaft 2 = 20.53 horizontal (20.49 vertical)
I will assume there is very little wear measuring the horizontal dimension. You can see the used rockers have worn 0.03, the used shafts 0.04.
The clearance with the rockers 602154 looks reasonable at 0.11 compared to 0.09 for the OE. For rockers 602153 clearance of 0.17 looks too big, nearly twice the OE. I'm going to send these back and get some more.
If you use the vertical dimensions of the OE the clearance goes to 0.15 and 0.16.
Comparing the shafts the AM actually have the oil holes chamfered which the OE hasn't.
And
Well I have received my new rockers, these are branded Britpart OEM. These others were just rapped in old newspaper. These also have date codes cast into them which is nice, shows they are interested in traceability. The finish of the bore is also much finer and the aluminum looks nicer.
They all measure 20.55mm ID which gives a clearance on my 20.51mm shaft of 0.04mm compared to the non branded ones of 0.11 and the worn OE ones of 0.09mm
Re: Rocker shaft
Posted: Sat Nov 30, 2024 8:57 am
by Jonny427
Hi Volvo rockers could be fitted to the Rover shafts, they were an upgrade made of steel, instead of aluminium Rover rockers. I used these a long time ago, and didn't think they were available now, also the steel rockers had a bleed hole at the bottom which needed to be sealed to stop the oil leaking out. I also had the rocker shafts hardened. Also available are end post supports from John Eales which reduce the flex at higher RPM'S, Ihave these on my engine.