Valve shim steel grade?

[Melvyn Best]

Adjusting valve clearances by tipping the valve has been around for many years as engine manufacturers recommended methods Correctly done on a valve facing machine is as 8ob says is quicker, easier and more accurate way than skimming shims.

 

[mtt.tr]

Problem with grinding the stem is its no good for routine maintenance.




Which reminds me my mrs bike needed the valve clearances checking

 

[Melvyn Best]

Problem with grinding the stem is its no good for routine maintenance.




Which reminds me my mrs bike needed the valve clearances checking

At one time grinding the valve stem or lapping the valves in further was the only way to adjust valve clearances, a lot of cars had split valve guides that had to be removed to get the valves out

 

[pod70]

One of the guys I used to race with made his own shims on a ZXR400 using the shanks of old 7.5mm drills.
Personally I just get them from uk-powerparts on Ebay Just under £4 each if you order 2 or more although I've got quite a collection now...

 

[Kram]

So the answer is, noone knows I think originals or silversteel/en19 hardened and tempered on the soft side will be safest.

Doing stems will require the head off, atleast 100 quid more with gasket, bolts and other bits. Old low value bike its not worthwhile.

 

[tom2207]

So the answer is, noone knows I think originals or silversteel/en19 hardened and tempered on the soft side will be safest.

Doing stems will require the head off, atleast 100 quid more with gasket, bolts and other bits. Old low value bike its not worthwhile.

no , the answer really was , buy the real thing , but work out what you actually need first ..

 

[Kram]

Tom you were reading a different question

I cut three of the original shims and two are perfect size. While they are case hard, there is plenty of case left. One I cocked up, as expected and another was too small to reuse anyway. So two are needed, 1.93 and 2.02mm

I decided on en24.

Shims are done. 1.93, 2.01 and one on the right is spare, 2.05mm, hardened and tempered at 500c, it kept its size.
I did some impact tests on another hard one. Club hammer plus a punch couldnt get it to shatter. The punch needs regrinding