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VB 308 Problems with the adjustment roller rockers help please

geforcevb

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Any advice would be good.
 
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connors

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Hi Mate,

I don't know the answer but I have seen an article about the adjustment of them somewhere. I would "Google" Roller Rocker Adjustment and check out "You Tube" as their is bound to be answers on the net somewhere. In the meantime if I find something I will let you know.

Good luck
 

VR38

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do you have a solid or hydraulic cam?
 

geforcevb

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Hi Connors mate I have goggle
 
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geforcevb

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1/4 of a turn and lock it off I might be doing damage.
 
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geforcevb

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I have now gone back to
 
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Cheap6

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A solid lifter will always clatter a little bit, louder with a larger clearance gap.

You will need to answer that question first though: what type of lifter do you have, as that determines the method to use to adjust the rockers. I suspect that is where some of the confusion comes from; not knowing that (and that there's a difference).

If you have solid lifters you will be setting the gap between the valve tip and the rocker roller (tip) with the rocker, pushrod and lifter pushed back into contact with each other at the rocker end. There is some leeway as to what the clearance can be and you can alter the cam timing a bit by opening up or closing down that gap. You should never have zero gap. If you have solid lifters and you try to preload them you will open the valve(s) with the cam on the base circle.

The finger tight bit is for hydraulic lifters (and the cam profile should match the lifter type). With hydraulic lifters there should be no clearance between the rocker and the valve tip and they should be preloaded so as to put the (pumped up) lifter into the middle of its travel. You'll generally be right if you spin the adjustment down until the there is no free play between the pushrod and lifter, then go down a further half turn. That should collapse the lifter the correct amount but it depends on the lifter and the thread pitch of the adjustment screw. It also presumes that the pushrod length and rocker fulcrum height are correct. What you don't want is no preload which would mean the lifter piston is sitting on the circlip that is only meant to stop it flying apart or too much preload (hard to do), which means the lifter locks solid.
 

ari666

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What style is this called. I believe there a yellow terra roller rockers twin shaft versions not individual rockers . ANY ADVICE WOULD BE GOOD.

YellaTerra_Roller_Rockers_CloseUp_1.jpg


yella terra adjustable shaft mount. those pictured are 1.6's im pretty sure all 308's are 1.65.

if you have hydraulic then the easiest way is to:

cut down a 5mm (i think 5mm cant remember) allen key so its just a shaft with no bendy bit
warm up engine and leave running
remove rocker cover
loosen 11m lock nut
fight with the stupid allen key thing for a few mintes trying to get it in the hole while the pushrod spits oil at you
loosen the allen key till it starts clacking around
tighten the allen key till the moment it stops clacking
tighten the lock nut
move onto the next one.

i tried over and over and over again to get a good adjustment out of the whole: "twist the pushrod blah" problem is if you clamp it a shade too much it squirts the oil out of the lifter and youre never sure if youve gone beyond the point of it grabbing, which means you need to start the engine again to fill it back up.

doing the adjustment while the engine is running is by far the easiest way. its messy though, but works. also there is another benefit. if you tighten up too much, the engine rpm will drop and vacuum becomes unstable. if you notice the drop, you loosen it off again. if you over tighten with the "twist the pushrod" method, youll only know when you get erratic idle once youve put it all back together.


i will never do an adjustment another way ever again:
 
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