valve spring shims

[boler76]

anyone installed any on a Ford N??

 

[R Geiger]

(quoted from post at 19:35:47 12/09/23) anyone installed any on a Ford N??

Why would you want to?

 

[Jerrycpp]

I would use shims if I found any. Why? As a result of many valve grinds, the valve seats are deep into the block, lessening spring pressure. Result? Sticking or stuck valves.

 

[boler76]

yes that is why I was wondering about using shims, valve seat ground leaving less spring tension

 

[Mad Farmer]

(quoted from post at 11:51:43 12/10/23) I would use shims if I found any. Why? As a result of many valve grinds, the valve seats are deep into the block, lessening spring pressure. Result? Sticking or stuck valves.

Is there a spec for installed spring height?

 

[R Geiger]

(quoted from post at 14:54:25 12/10/23) yes that is why I was wondering about using shims, valve seat ground leaving less spring tension

ASY TO REPLACE VALVE SEATS!

 

[boler76]

it is easy I suppose if one has the required equipment?

 

[LarryMaine]

This week I opened up my 172 cid engine and found spring seat shims (VMI) under 6 of the springs, two of which had double shims. First thing I did was to look at the valve seats to see if that was why they needed spring shims. My thinking on this for now, is that the engine has been rebuilt at least once. I was expecting some of the valve seats to be cut down deeper than others, but in reality, the exhaust seats were all the same, and so too for the intake seats. In your case I would just install new springs with the same shims you had now, unless your mechanic suggests you replace the seats, in which case no shims are needed. Other motors sometimes use seat springs on all the valves despite the seat height, because the shims reduce spring fatigue, and they reduce the risk of valve slap.