bullzed

for about 15 seconds yeah. Didn't know which valves were affected

Thanks for clearing that up guys. I've checked the oil holes (when we had it running without the rocker cover on), they're all working perfectly. The wipe patterns are really deep and some of the rockers are chipped. It's apparent that there's something wrong there as others said they'd never seen the 'deep' wipe patterns before. This is an aftermarket cam however all the work was done by the owner of the motor before me. The cam is an E30, i'm not up to date with all that so I would have no idea what lash pads are needed. What measurement shouldn't exceed 170thou? I measured from the bottom to where the rocker sits in the lash pad and it's 6.76mm (0.266 inches [is this the measurement that shouldn't be exceeded?]). Another thing worth noting is that the lash pads spin freely, is this normal? The rockers are bouncing out so much that it's giving the lash pads time to spin.

Thanks guys, I got contacted by Paul who says he has some up at his Z graveyard for a reasonable price.

All the valve clearances were fine, what would you use to measure the distance between the cam lobe and the lash pad seeing as they're not directly under each other? I've sourced replacement rockers from Paul in Brisbane, he has a Z graveyard which has helped me a lot in the past. So far I've only checked 2 rockers for their condition, hopefully they don't all have deep wipe patterns.

Haha, I've been helped out quite a few times on this forum already. I need to find out how to adjust the pivot height. Is it simple? Would it be possible for you to give me a short run through?

Cheers Steve, much appreciated I have checked the valves and they're all good, getting some new rockers on Saturday and then I'll have to see what happens after they're in. I've got another Z mate trying to find out what's caused all this. I shall update as things happen. Cheers Zac

I know the cam has been ground as the car sounds as lumpy as but I would have no idea about the lash pads. The guy before me did it all. I can check the lash pads tomorrow.

Looking for a full set of rocker arms for an L28 with an N42 head. Current ones are buggered, will pay for postage. Text on 041 606 1225 or pm. Happy new year to all!

Just an update We pulled the affected rocker off after this happened: As you can see the rocker itself is off centre below. Then we looked at the rocker Huge groove along the middle and a chip in the side. I'm guessing this is the whole problem. The other one that has been jumping also has a small groove but not to this extent. I guess I need a whole new rocker set, yes?

It's an N42 head with an F54 block. I've had this motor for about a year, it's only been in use for the past 2 weeks. Hardly any hooning, Dad never takes it over 6k.

Thanks mate, definitely appreciate the help. I'll probably have to pull the head apart (and keep everything in order) just to see if the wipe and the lash pads are how they should be. I can see the next month being fun

Yeah I know, they're a mess. I bought this L28 from a guy who pulled it out of an MQ Patrol, he said it had been reco'd and totally setup, but now it seems that there are problems arising; right when we get it registered. I guess the Z will be off the road for a while until I can get this all sorted out. I'll be unbelievable taken aback if this whole motor is to the standard the head is.

These photos are pretty poor seeing as there's no room to get a side on photo. This is the best I could get ^ 2 cylinders closer to firewall ^ 2 cylinders closer to front

This has happened 3 times now, once at about 4k, once at start up and once at idle. I'll have a look at the clearances when Dad gets home and I'll then give an update on how it runs. Cheers all.

Sure can Sorry for the horrible quality, it's sitting in a dark garage at the moment

Okay, so I took the valve cover off again and this time, it was a different valve. The rocker had jumped up onto the right ear of the lash pad, all of the lash pads are undamaged and I really have no idea why or how the rockers are jumping on top of them. This one occurred when we started the car, anyone have any ideas about what's wrong?

Hi David, That's the thing, it DOES rotate. Somehow, the rocker comes out of the pad, the pad is given time to rotate and the rocker then comes down on it without seating. Any idea how this happens? I can take a picture of it tomorrow if you would like?

I recall the lash pad being in perfect condition, the lash pad rotates and the rocker rides on-top of that. This means the valve never closes and it then opens further. I have no idea how it jumps out of the retainer, with dual valve springs i don't see the valve sticking.

Hey guys, today dad and I took the Z out for a run to see if we could clear what seemed to be a semi-blocked jet in the SU's. It'd been coughing and losing power on and off and we didn't know what was the problem. This all occurred after dad plugged a pinhole in the gas tank and had to drain it, we think some debris got into the fuel line. Anyways, just as we were coming home, something went badly wrong, the car sounded like it was running on 5 cylinders and there was a bad knock. We got home, pulled off the rocker cover and found out that one of the rockers had slipped off the valve stem and wasn't pushing it properly. We put it back on and checked the valve clearances and thought it was fixed, then we took it for a spin and it happened again. We're not sure what the problem could be, dad thinks the rocker itself may be rooted. Have any of you guys had any experience with this problem or heard of it? Much thanks in advance

I chipped in $20, cheers to all the welcoming people on the forum.

I'm okay for either the 20th or something in the new year, I would however need to know when abouts it would be as I'm also going to Japan early next year >.> Diehard newbie maybe

I can come on the 20th, is there anything I need to bring? Unfortunately I won't be able to bring my ZX, it's not registered yet

I should introduce myself, I'm Zac I'm actually leaving on the 24th of November so I may have to wait till next time. I don't get back until Dec 21st. Thanks for trying to accommodate though.

In my opinion, it's best to do it right the first time, wait that little bit longer for the better product. I'll definitely look into a better shock.