Torque specs for cyl head screws?
#1
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Torque specs for cyl head screws?
The head on my 46fx leaks a little when running. I have 1 head shim installed. The cyl head screws are as tight as I dare get them. I do have a torque driver. What are the torque specs for the cyl head screws as well as the backplate screws?
Thanks,
ZB
Thanks,
ZB
#2
Senior Member
Torque specs for cyl head screws?
How did you tighen the screws? I always tighten my screws as a star (start at 9 o'clock and then go to 3 o'clock and so on). If all is done right you don't need to use a torque driver.
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Torque specs for cyl head screws?
I do it the same way Jacs, I have never had and engine do this. During a run, you can see spew coming from one side of the head. I even added another shim gasket. Still the same thing. When I do tighten the screws, I get them very tight but, since this is a Tower .46, and I have had a GMS. I am very aware that you can easily strip the threads around the cyl head. Ask me how I know this.
ZB
ZB
#5
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Torque specs for cyl head screws?
We're sorry, but we've never had a torque specification on the various screws and bolts from O.S. They just get snugged-down so that they're tight, but not so tight as to cause stripping.
If an model engine's leaking compression between the cylinder head, head gasket, and cylinder liner, something's warped. The head or gasket would be the most likely culprits.
Don't continue to run the engine with a leaking head gasket because the blowby will cause the engine to eventually overheat. We've seen engines actually burn away the head gasket when there's a combustion leak. The hot gases eventually erode the gasket and then go to work on the head. If it's gone on enough to damage the gasket, we've seen damage to the head, and wind up replacing the head as well as the gasket.
Sometimes the head gets warped in an overheat, sometime's it wasn't installed correctly, and sometimes the machining was off. In a few cases, a piece of trash got caught there when the head was last installed. This last bit has been rarely-seen from the factory, but a result of others performing work on the engine.
If an model engine's leaking compression between the cylinder head, head gasket, and cylinder liner, something's warped. The head or gasket would be the most likely culprits.
Don't continue to run the engine with a leaking head gasket because the blowby will cause the engine to eventually overheat. We've seen engines actually burn away the head gasket when there's a combustion leak. The hot gases eventually erode the gasket and then go to work on the head. If it's gone on enough to damage the gasket, we've seen damage to the head, and wind up replacing the head as well as the gasket.
Sometimes the head gets warped in an overheat, sometime's it wasn't installed correctly, and sometimes the machining was off. In a few cases, a piece of trash got caught there when the head was last installed. This last bit has been rarely-seen from the factory, but a result of others performing work on the engine.