Wb 202 noisy rockers/ lifters.

[Danfield]

You didn't fit these did you?

https://forums.justcommodores.com.au/threads/new-crow-cams-hydraulic-lifters-defects.296954/

Nah I got a replacement set.

 

[Danfield]

Some people suggest shaving down the rocker arm bridges as a cheap fix for this. Im wondering if this would make any sense if the lifters already have preload? Or will I just be giving them more preload? Is the idea that less travel would make it easier for them to pump up?

 

[Immortality]

Can you measure the pre-load you have now?

 

[Danfield]

Can you measure the pre-load you have now?

Not sure how to do that, in my mind any preload should be fine on a hydraulic as long as it's not bottomed out. That's what I don't understand about the method.

 

[Immortality]

There is a minimum as well as a maximum. Normally speaking, you screw down the rocker until it just holds the push rod (easiest way is to spin the push rod and wind down the rocker and you will feel when it just starts to load up). Then take note of how many more turns of the rocker bolt till the rocker seats on the pedestal. IIRC for these you want a minimum 1/2 to 3/4 turn.

 

[Danfield]

There is a minimum as well as a maximum. Normally speaking, you screw down the rocker until it just holds the push rod (easiest way is to spin the push rod and wind down the rocker and you will feel when it just starts to load up). Then take note of how many more turns of the rocker bolt till the rocker seats on the pedestal. IIRC for these you want a minimum 1/2 to 3/4 turn.

Oh, of course. I didn't think to check it that way on non adjustbles. Cheers, I'll check it out.

 

[Danfield]

Just checking the preload again. Seems that some are about 7/8 of a turn past zero lash. Would this extra 1/8 of a turn past the maximum 3/4 be the issue? I could try shimming the bridges?

 

[Immortality]

Nahh. 1/2 to 3/4 turn is normally the minimum. Maximum is probably double that.

7/8 turn sounds ok to me. Others may way in as I haven't stuffed around with these in decades.

 

[Danfield]

Nahh. 1/2 to 3/4 turn is normally the minimum. Maximum is probably double that.

7/8 turn sounds ok to me. Others may way in as I haven't stuffed around with these in decades.

OK thanks, yeah I didn't think 1/8 would make any difference.

 

[EYY]

what did the lifter bores look like when you removed the lifters? Were the old lifters easy to remove?