Clearances for hydrolic lifters?

[zentac]

Anyone know what the standard clearances are for the hydrolic lifters?

[psbarham]

eer 0.000000000mm , the whole point of hydraulic adjusters is so you dont need to allow for expansion and wear of the valve train components , basically they are self adjusting

[Gazzor]

As he said, I take it they are noisy and that is why you wanted to adjust them?

if so it is your lash adjusters or tappets as they are called, you can get up-rated sets that have bigger oilways that stop it happening again, bit of a design fault, not to bad a problem just annoying more than anything and made worse by not changing the oil regular

[zentac]

Thanks guys, but you should know me by now its never that easy.... Ive had some cams re-worked and Im making up some shims to lift the followers to make sure they sit correctly. So I just wondered if anyone knew if they had any pre-load on the followers or are they flush or are they loose (which I wouldnt have thought). My initial question could have been put better.

[peter thomson]

I imagine that will be a difficult question to answer but in a Rover V8 the preload was anything between 20 and 60 thou. Too much or too little between these 2 values would eventually result in damage to the engine as far as I remember but probably of not much help to you

[Nick Mann]

So is your question how much are they compressed by in their least compressed position?

I can't answer it anyway, just trying to understand what you are after.

[zentac]

yeah

[stuartturbo]

surely it's not just not a shim the size of the radius reduction on the cam
Ie standard cam has an arc of a rad 28mm and the new regrind has a arc rad of 27.5mm so 0.5mm shim????

[zentac]

yeah but thats assuming they were in tollerance to start with, I would rather make sure.

[Eurospec]

Dont know mate, but normally when you get cams for these motors, the supplier gives you lifter shims.

I make the assumption here that what you have done is a grind on a std cam, rather than a billet cam? A billet cam shouldnt need shims. A grind will.

Certainly the lifters are held under pressure, but i dont know how much. Sorry dude.

Cheers,

Ben.

[zentac]

cheers ben, yes they are a re-grind.