Head Clearance

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Old 11-30-2008, 05:51 PM
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Default Head Clearance

Could I please have detailed directions on measuring head clearance? thanks I do have a digital calipers
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Old 11-30-2008, 06:07 PM
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Frank,

pull the back plate but leave the head bolted in place. turn the crank to TDC (top dead center) then pull the head and shims. (if you turn the crank with the head removed there is a good chance you will cause the sleeve to slide in the block and this will affect your first measurement.)

1. Measure from the top of the sleeve to the piston face with the probe on the butt end of the caliper. (write the number down)
2. measure the length of the portion of the head that inserts into the sleeve.(again w/the probe on the butt end of the caliper)
3. measue the thickness of the shim(s)

take your answer from #1 - #2 + #3 = your head clearance (aka. deck height).

hope this helps

chunk
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Old 11-30-2008, 06:36 PM
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way easier method.
remove glowplug
get a 4" long piecethin piece of solder
bend the solder into an "L" shape 1/4" from the bottom
stick the solder into the head button
slowly spin the crank one revolution
pull the solder out and use your calipers to measure the thickness of the flattend solder.
done..........
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Old 11-30-2008, 07:04 PM
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Originally Posted by chunk t View Post
Frank,

pull the back plate but leave the head bolted in place. turn the crank to TDC (top dead center) then pull the head and shims. (if you turn the crank with the head removed there is a good chance you will cause the sleeve to slide in the block and this will affect your first measurement.)

1. Measure from the top of the sleeve to the piston face with the probe on the butt end of the caliper. (write the number down)
2. measure the length of the portion of the head that inserts into the sleeve.(again w/the probe on the butt end of the caliper)
3. measue the thickness of the shim(s)

take your answer from #1 - #2 + #3 = your head clearance (aka. deck height).

hope this helps

chunk
+1 Just make sure your at TDC when taking your measurements. when measuring from the top of the sleeve to the top of the piston, take multiple measurements in multiple locations, just to make sure your getting an accurate reading. Good Luck
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Old 12-01-2008, 06:08 PM
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i get a .30 reading woth no shims? does this seem acccurate? so with the .30 shims that came on the engine that makes a total of .60 head clearance?
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Old 12-01-2008, 06:21 PM
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Originally Posted by franklucas View Post
i get a .30 reading woth no shims? does this seem acccurate? so with the .30 shims that came on the engine that makes a total of .60 head clearance?

.60? are you measuring in mm or thousanths
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Old 12-01-2008, 06:23 PM
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mm
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Old 12-01-2008, 06:26 PM
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duh sorry new at this thousands would be .024?
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Old 12-01-2008, 06:29 PM
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Originally Posted by franklucas View Post
mm
here is your DH in thou 0.02362204724412
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Old 12-01-2008, 06:31 PM
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Thats the high side of 23 so figure 24, thats a good starting point, what motor are you measuring?
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Old 12-01-2008, 06:35 PM
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axe rossi x1 comp. 30% fuel
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