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Discussion Starter · #1 ·
The 444 shut off while cutting grass few weeks ago. took it back to garage and found plug blew out of a heli coil. It was blowing by and out the breather for some time. Looked at piston and I see a gap around cylinder wall at bottom. I think piston is 1 over so can I go to another piston and have machine shop bore cylinder walls? Any thoughts would be appreciated
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Well, for sure your head is done, Looks like a couple of cracks around the plug hole,

A decent rebuild shop could say if it can be re-bored,, visually, doesn't look very good. They might be able to stick a sleeve in there and bore it out to standard.
 

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It looks like carbon buildup on the top of the bore. That stuff gets hard and eventually the piston starts smashing into it causing the piston damage you see. You can measure the top of the bore to see if it is stock diameter or was bored out previously.

The only way to know the condition of the block is by tearing the engine down and measuring things. I had one in similar condition and the bore measured good. A light hone, new piston and rings, and back in business.

As for the head, I'm with Lionel.
 

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Discussion Starter · #4 ·
Update - Took block to machine shop and found that a bolt hole on the deck was helicoiled down into the exhaust port; which may have been the cause for all the pressure in the crankcase. I never saw it. Machine shop also replaced exhaust valve guide (I supplied new guides if they were needed so hopefully saved me some $$$??)
Machine shop is going to drill out helicoil install new 1/2' bolt and then cut the 3/8" thread into it. hopefully it will work and seal up the hole down into the exhaust port.
 

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Discussion Starter · #5 · (Edited)
Thanks to Barneveld for the used head! The machine shop cleaned it up and it was straight so got that on there now!! Progress.

Update. Got the block back from machine shop and started the rebuild. Piston is .020 over and installing new valves machine shop replaced exhaust valve guide. I also as lapped new valves with compound and seats real nice
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hi
 
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