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The mkiv Supra Owners Club

HKS Valve Clearances


Steve

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Just been searching to find the valve clearances for HKS 264/264 camshafts.

 

I found this

 

Clearance in mm (cold)

 

0.15-0.25 int

0.25-0.35 exh

 

In old money that's

 

0.006" - 0.010" int

0.010" - 0.014" exh

 

Can someone please confirm that these are the correct values.

 

:)

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Right, have been out measuring the valve clearances this morining and here are the results:

 

REAR OF ENGINE

 

EXH INT

 

0.29 0.18

0.30 0.18

0.28 0.20

0.30 0.19

0.30 0.20

0.30 0.19

0.30 0.19

0.30 0.19

0.28 0.19

0.28 0.19

0.28 0.19

0.30 0.15

 

FRONT OF ENGINE

 

So most of them seem ok, apart from the front valve on the intake side. Would that cause a problem?

 

I was advised by Ryan to check these after hearing some strange noises through his DET cans whilst mapping and at SRR yesterday (hense my runs were aborted). I also have been getting a hesitation occasionally which causes slight DET(IIRC).

 

I also get alot of popping in the exhaust on lift off which my car has always done since i can remember. Cant remember what it was like when stock (stock cams).

 

Is there a posibility that a valve spring has failed?

 

Cant really think of much else that can cause this. Any ideas?

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Nah it'll just be the 1 shim was bigger than the rest.

 

If you've access to the proper tool, then pull the shim out and measure it. Subtract 0.05 to that thickness and go and get one from toyota. They're about a tenner each.

If you haven't got the proper tool, then removing the shim is a camshaft out job. Not tricky just a bit of a laborious task as you have to get the loosening / tightening sequence of the valve caps right. Once the camshaft is off you can remove the shim using a magnet. Measure it up, subtract 0.05 and away you go...

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Definatly get no1 on the intake changed Steve, abit too tight that..

 

Also when changed do a leak down test of the engine if you can to see if the valve seating has been affected due to tight tolerance.

 

Ryan

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