J
Jamie
Boy did I say the "F-word" once or twice today. Bob, the tool you
showed me for depressing the valve springs was exactly what I could
have used.
OK - here's the deal on my valve shim job today:
1) The plan: measure the existing shims to match the clearance
measurements I have. Plug these into the formula to determine what size
replacement shims to buy on Saturday.
New Shim Size = (C-A) + B
C = original shim measurement
A = Spec clearance (.40mm)
B = Measured clearance
It is important to note the parenthesis because should you do C - (A+B)
you get a different number.
So - my formula will be: (4.00mm - .40mm) + .508mm = 4.108mm
I'll buy 4.10 mm shims.
Here is what I didn't like about this job and so I am going to take a
calculated risk.
All of my clearances were measured at .508 mm on cylinders 1-3 on all
valves. Cylinder 4 measured .457 on each valve.
I was only able to measure the first 3 shims (cylinders 1-2, valves
1,2,3) because I did not have great tools to work with. Each shim
measured 4.00mm. My vernier caliper was incremented by 1mm, so I made
sure it wasn't 1/2 mm off by eye.
Because the first 3 cylinders (6 valves) all had the same .508
clearance, and the first 3 valves were all the same 4.00mm size, I am
going to assume the next 3 shims are 4.00mm.
That is the calculated risk. To be sure, after I replace the shims I'll
take measurements to ensure I am within the .30 - .40mm cold clearance.
I don't think I will do cylinder 4 at this time because I am not able
to measure the shims. My plan is to drive 1.5 hours to the Volvo
dealer and buy the shims I need. I will not have a kit.
I may just buy that valve spring tool though. It is a pain using a
screwdriver. I had to turn the camshaft to depress the springs, insert
screwdriver, turn cam to release the lobe and hope the screwdriver
held. Sometimes it did. Sometimes it slipped off.
Jamie
showed me for depressing the valve springs was exactly what I could
have used.
OK - here's the deal on my valve shim job today:
1) The plan: measure the existing shims to match the clearance
measurements I have. Plug these into the formula to determine what size
replacement shims to buy on Saturday.
New Shim Size = (C-A) + B
C = original shim measurement
A = Spec clearance (.40mm)
B = Measured clearance
It is important to note the parenthesis because should you do C - (A+B)
you get a different number.
So - my formula will be: (4.00mm - .40mm) + .508mm = 4.108mm
I'll buy 4.10 mm shims.
Here is what I didn't like about this job and so I am going to take a
calculated risk.
All of my clearances were measured at .508 mm on cylinders 1-3 on all
valves. Cylinder 4 measured .457 on each valve.
I was only able to measure the first 3 shims (cylinders 1-2, valves
1,2,3) because I did not have great tools to work with. Each shim
measured 4.00mm. My vernier caliper was incremented by 1mm, so I made
sure it wasn't 1/2 mm off by eye.
Because the first 3 cylinders (6 valves) all had the same .508
clearance, and the first 3 valves were all the same 4.00mm size, I am
going to assume the next 3 shims are 4.00mm.
That is the calculated risk. To be sure, after I replace the shims I'll
take measurements to ensure I am within the .30 - .40mm cold clearance.
I don't think I will do cylinder 4 at this time because I am not able
to measure the shims. My plan is to drive 1.5 hours to the Volvo
dealer and buy the shims I need. I will not have a kit.
I may just buy that valve spring tool though. It is a pain using a
screwdriver. I had to turn the camshaft to depress the springs, insert
screwdriver, turn cam to release the lobe and hope the screwdriver
held. Sometimes it did. Sometimes it slipped off.
Jamie