Crap to Cream, con’t the engine rebuild, tappet adjustment issue fixed…. Onward.

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The lack of adjustment of the tappets / rockers has now been fixed, machined 2mm off all the rocker shaft posts. All the centerline heights were off by a little bit, now they are all spot on.
Spigot bearing offered a challenge, did not want to come out, had to resort to "mechanical violence", now I'm continuing with rebuilding the engine.
Fitting the gearbox will next on the menu once I’ve fitted the backplate.

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29 июн 2024

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Комментарии : 4

@carstenmoore5760 14 дней назад

Hi Marty, As per the previous posted comment, the shims were introduced under the centre pedestals as the early engines suffered from premature wear in the pedestal bores due to the rocker shaft spinning, which was unwanted. The BMC technical boffins came up with the shim idea to create a 'bow' in the rocker shaft, preventing it from rotating.... A bit 'Heath Robinson', but it's a cheap and simple solution that cured the problem. Looking forward to the next installment 👍.

@CrapToCream 13 дней назад

Firstly thank you both, Carsten and David for the comments, I went a looking in my manual to see what's what. You are both correct, the manual references two shims under the center pedestals. On both the engines I have stripped there was no shims installed. Right now, I'm going to leave as is, I'm not loosening the head off again and replacing the head gaskets again, I've had to do this once already due to the issue with the tappet adjusting screws and getting the pedestals machined in the first place. Thankfully I didn't put the shim in the pedestal with the small amount of clearance, I could just move the rocker shaft with all the bolts tightened with some assistance. Due to there being an anti-rotation pin in the pedestal with the oil way in it I would assume that the misalignment would be to prevent fretting rather than turning. Also, I took the rocker cover off to just check things again and found that I hadn't remembered to open up the split pin in the end of the rocker shaft, so thank you for sparking that "train of thought".

@David-wy9jl 14 дней назад

The factory used to install a thin shim in the 2 middle pedestals, apparently to add some tension to further keep the rocker shaft from movement. Some question this.

@CrapToCream 13 дней назад

Hi David, Please see my response to Carsten.