update to high crankcase pressure

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update to high crankcase pressure

Post  muddog899 on January 18th 2015, 11:20 pm

So finally had a chance to start tearing down the motor to see what happen with the leak down test after pulling the head on the number 1 side I find that the #1 piston and head have some damage it looks like a small screw or a piece of plug broke off. But I always check my plugs and would have seen that it was broken. Here are the pictures if anyone has any ideas what might have happen I still need to pull the piston out of the block but didn’t see any scoring.





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Re: update to high crankcase pressure

Post  kim on January 19th 2015, 12:23 am

Looks like someone had a valve stem keeper disappear.

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Re: update to high crankcase pressure

Post  cool40 on January 19th 2015, 1:04 am

Carb screw? Suspect
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Re: update to high crankcase pressure

Post  c.evans on January 19th 2015, 1:57 am

I'd say a screw or air bleed out of the carb, and you've pinched some rings lands on that piston.

Hope this helps,

Charlie

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Re: update to high crankcase pressure

Post  ROAD RAGE on January 19th 2015, 7:44 am

Screw from throttle shaft???????
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Re: update to high crankcase pressure

Post  crittersf1 on January 19th 2015, 8:40 am

It swallowed a screw from somewhere.
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Re: update to high crankcase pressure

Post  dfree383 on January 19th 2015, 9:47 am

ROAD RAGE wrote:Screw from throttle shaft???????

X2 or maybe a bleedp
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Re: update to high crankcase pressure

Post  bbf-falcon on January 19th 2015, 12:15 pm

Looks like a small FUSE from the fuse box Laughing

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Re: update to high crankcase pressure

Post  muddog899 on January 19th 2015, 12:23 pm

Ok checked the carb and didn't see anything that was missing on it so have no idea what got in the motor,
how bad does the head look and should I send it out for repair. If so its not looking good to make any races for the near furture, I still need to check the piston ring lands for damage.

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Re: update to high crankcase pressure

Post  cool40 on January 19th 2015, 2:18 pm

A cleanup cut on the head and be sure the valves aren't bent.
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Re: update to high crankcase pressure

Post  muddog899 on January 20th 2015, 12:29 pm

well still cant figure out what screw got in there
all just have to fix it and carry on.
thanks for the help guys

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