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Doing the math, It sounds like I need a 1.900 shim. If I go down in shim size, wont the clearance get even larger or am I thinking about this incorrectly? I guess if I up the shim size does the valve clearance get smaller or larger? I would think larger but I may be wrong.
The hardest part of doing the valve clearances is getting the actual clearance measurement correct. If the value for the actual is not right, then the calculation is wrong and the shims ordered are wrong. But you don't know it's wrong until the cam's are reinstalled and torqued down and a follow-up clearance check is made. It can be frustrating for sure.
Like they say, the devil is in the details. Good luck and let us know how it goes.
Question: How about Clymer and Workshop manual state different ways to measure clearance. One TDC measure intake cylinder 1 & 3, 180-degrees to measure cylinder 2 & 4 intake and so on for exhaust. Clymer states TDC measure all valves Cylinder 1, 180-degrees cylinder 2, 180-degrees cylinder 3, and so on.
Measured intake 1 was at 0.06 of spec 0.16. Changed the 2.02 to 1.92. Re-measure and was 0.08. All the valves only gained about 0.02-0.03 and I performed the math correctly and the clearance is incorrect. The cam bolts are torque, cam gear aligned intake and exhaust lines, and cam chain tensioner tight. What happened?
Question: How about Clymer and Workshop manual state different ways to measure clearance. One TDC measure intake cylinder 1 & 3, 180-degrees to measure cylinder 2 & 4 intake and so on for exhaust. Clymer states TDC measure all valves Cylinder 1, 180-degrees cylinder 2, 180-degrees cylinder 3, and so on.
Measured intake 1 was at 0.06 of spec 0.16. Changed the 2.02 to 1.92. Re-measure and was 0.08. All the valves only gained about 0.02-0.03 and I performed the math correctly and the clearance is incorrect. The cam bolts are torque, cam gear aligned intake and exhaust lines, and cam chain tensioner tight. What happened?
Your math looks wrong on exhaust for #4. Is your timing set properly? That's the only thing I can think of.
Question: How about Clymer and Workshop manual state different ways to measure clearance. One TDC measure intake cylinder 1 & 3, 180-degrees to measure cylinder 2 & 4 intake and so on for exhaust. Clymer states TDC measure all valves Cylinder 1, 180-degrees cylinder 2, 180-degrees cylinder 3, and so on.
Measured intake 1 was at 0.06 of spec 0.16. Changed the 2.02 to 1.92. Re-measure and was 0.08. All the valves only gained about 0.02-0.03 and I performed the math correctly and the clearance is incorrect. The cam bolts are torque, cam gear aligned intake and exhaust lines, and cam chain tensioner tight. What happened?
The important thing in taking the measurement is that the cam lobe is pointing away from the valve stem. There are different methods of achieving this. None are more correct than another. Some will achieve a position where more lobes are pointing away at the same time on different cylinders. This reduces the number of times you have to rotate the crankshaft between measurements. The intake spec is 0.20 ±0.03mm, so a range of 0.17 to 0.23 mm. Getting a measurement of 0.06 mm is quite a ways from what the specification is. To me, it seems significantly far from what the clearance should be based on normal wear. I don't know what the mileage is or the condition of the engine, but I'd be making sure that the method I'm using to make the check is, as well as making sure that the tools I'm using are exceptionally clean. Remember that you're trying to determine differences of hundredths of a mm, and that's not much.
Image below shows where measurement is made, but as long as you're checking along the base circle, you're fine. Image is not the F4i, only for example.
The important thing in taking the measurement is that the cam lobe is pointing away from the valve stem. There are different methods of achieving this. None are more correct than another. Some will achieve a position where more lobes are pointing away at the same time on different cylinders. This reduces the number of times you have to rotate the crankshaft between measurements. The intake spec is 0.20 ±0.03mm, so a range of 0.17 to 0.23 mm. Getting a measurement of 0.06 mm is quite a ways from what the specification is. To me, it seems significantly far from what the clearance should be based on normal wear. I don't know what the mileage is or the condition of the engine, but I'd be making sure that the method I'm using to make the check is, as well as making sure that the tools I'm using are exceptionally clean. Remember that you're trying to determine differences of hundredths of a mm, and that's not much.
Image below shows where measurement is made, but as long as you're checking along the base circle, you're fine. Image is not the F4i, only for example.
Yeah I got this down thankfully. Everything measured within spec after adjusting all valves and will get everything buttoned up tonight. Only worries at this point are adjusting the manual CCT but I think I've read enough about it at this point. Tighten until noise stops then back off 1/6-1/4 of a turn and lock the nut.
06-22-2022, 09:45 AM
Valve Clearance Check
