Beau
Well-Known Member
- Joined
- Jan 28, 2011
- Messages
- 2,014
- Country Flag
I'm finally putting together the AMC head I've had stored for a good few years now, but upon assembling it all have run into one main issue.
I'll walk you through what I've done. I have a new head, new valves, springs ect.
I seated the new valves into the head using a hand lapping tool and some valve grinding compound paste. All went well. I then assembled all valves into the head.
New lifter cups installed. Now the SHIMS- This is where the trouble came up.
I didn't purchase new shims because of course they need to measured and the correct ones ordered. So I put some used shims in and read the clearances, of which all were out.
However, upon using Toyota's graph and selecting the appropriate shim size, it seems even the biggest shim won't bring 3 out of the 8 valves in spec. They will be out by 0.10-0.15mm. One would be 0.20mm out.
I'm running the options in my head and the only way to solve this issue is to grind down/lap the valve seats more so that the valve can seat slightly higher, thus reducing the valve clearance gap, does this make sense?
Otherwise how else do you guys suppose I get these valves in spec? How do the pros go about it? Valves are correct lengths as well. I'm puzzled
I'll walk you through what I've done. I have a new head, new valves, springs ect.
I seated the new valves into the head using a hand lapping tool and some valve grinding compound paste. All went well. I then assembled all valves into the head.
New lifter cups installed. Now the SHIMS- This is where the trouble came up.
I didn't purchase new shims because of course they need to measured and the correct ones ordered. So I put some used shims in and read the clearances, of which all were out.
However, upon using Toyota's graph and selecting the appropriate shim size, it seems even the biggest shim won't bring 3 out of the 8 valves in spec. They will be out by 0.10-0.15mm. One would be 0.20mm out.
I'm running the options in my head and the only way to solve this issue is to grind down/lap the valve seats more so that the valve can seat slightly higher, thus reducing the valve clearance gap, does this make sense?
Otherwise how else do you guys suppose I get these valves in spec? How do the pros go about it? Valves are correct lengths as well. I'm puzzled