Posted by French Garden on January 22, 2012 at 23:52:08 from (71.198.30.126):
I'm reworking an 8n and trying to find out how to determine whether my pistons are worn enough to need replacing or I can get away with a ring job and a valve job. (How much piston to sleeve gap is OK?)
Before I tore it down, it had poor compression (I didn't measure this, but could tell from the poor performance) and was burning a lot of oil, but the intake valve guides were clearly the source of a lot of the oil (the intake ports were covered with oil and the valves had a lot of slop in the guides) and it was in bad need of a valve job so the compression issue was clearly not all ring related.
The sleeves do not have much of a ridge in them and look pretty clean overall I have not pulled the pistons yet (will do so tomorrow.) I can mic the sleeves and pistons if need be, but do not know the specs for this or whether one can just put a feeler between the piston and sleeve to determine the wear.
It also had very low oil pressure so may need bearings and an oil pump.
I don't use this tractor a lot (I have 7 others and use this one for spreading compost only), so just getting it running better will probably get me to the end of my farming days.
Thanks to anyone who can help. I'm not an experienced mechanic, but old enough to ask questions.
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