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The mkiv Supra Owners Club

Valve lifter noise after changing shims


Mgrene

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Evening.

So, I have have just re-shimmed my valves and now the car is making a ticking noise coming from the head. I suspect that it is valve lifter noise (see video - hope you can hear it).

I changed the shims because the clearence was very tight and some was even below the minimum tollerance.

So to be on the safe side I tried to aim for a tollerance of 0,20mm (intake) and 0,30mm (exhaust).

I didn’t quite quite succeed to hit spot on but the clearence is at least larger than before.

I will add the spread sheet where all measurements are mentioned so you can see my method on how to calculate the new size for the shims.

I’m running HKS 264 cams and Brian Crower valves, springs & retainers.

so why am I now experincing this freakin noise? 🤷🏼‍♂️ It’s not like I’m running a huge clearence compared to before.

could it have something to do with the cams getting use to new shims or how does it work.

can I somehow identify which particular valve/shim is the issue? Don’t want to change all of them if its only one or two causing the noise.

The spread sheet will follow once I log in to my computer later this evening

IMG_8700.MOVFetching info... Edited by Mgrene (see edit history)
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Check them again after you have run it a few times. Something could looser than you expect. Typically will make more noise with a loose clearance than a tighter one. 

How long were you running the engine for? If you have specced to a looser clearance then its expected to make more noise whilst cold, once heated up clearances should tighten up. 

 

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  On 3/29/2021 at 9:59 PM, Mike2JZ said:

Check them again after you have run it a few times. Something could looser than you expect. Typically will make more noise with a loose clearance than a tighter one. 

How long were you running the engine for? If you have specced to a looser clearance then its expected to make more noise whilst cold, once heated up clearances should tighten up. 

 

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Hi Mike.

Yes I will check the clearance again this evening.

I had the car running on idle for 2 x 10-15 minutes (both times from cold start), so the engine did not see more than 80-85c oil temp. I did rev the engine of course while idling just to check if the noise disappeared at higher rpm but it's difficult to tell due to the noise of the exhausts and all.
Maybe I should have taken the car for a spin, getting it up to much warmer temperature?

I did not take the car for a run as I do not know if loose clearance could damage anything?

Looking through old posts on this page, I saw somewhere that Lee from SRD confirmed that HKS 264 cams needs a clearance of 0,20m (intake) & 0,30M (exhaust) and I am actually below that as you can tell from the spread sheet.

Could it be that when you combine the HKS 264 with uprated valves, springs & retainers, the clearance should actually be much tighter? or maybe the vales, springs & retainers has nothing to say in that matter?

So what I think I will do later today is to remove the valve covers and check the clearance again (for 20th time 😄) and then see if the clearance is larger than when I checked the clearance upon installation of the new shims. If it turns out that the clearance is still the same I will try to go for a bit tighter clearance. Just another 3-4 hours job that I hope that I could have avoided.

Stupid car. If it ain't broken, don't fix it. I just thought that it wouldn't hurt to get the clearances right.

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  On 3/30/2021 at 7:54 AM, Mike2JZ said:

Well if you were tighter before and have now gone looser across the board then that should explain your noise. 

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Yes and that is my conclusion as well. I'm just surprised that there is a noise really.
Yes, the new clearance is looser than before but still within the tolerance range and still leaning more towards the tighter clearance than the loose clearance.

Anyway, I will give it another go (re-shimming) later today and hopefully that will fix the noise.

Thanks for your time Mike. Much appreciated.

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