Originally Posted by edcorsaro
What is the best way to clean lifter bores with surface light rust?
If it's just 'light rust' then using a cleaning brush as 'Oger' suggests with a good Rust Penitrating Oil (insert your favorite brand here - I don't want to open that worm can...) will usually clean up the bore so the lifters slide smoothly.
Even though I now have a bore broach set-up for the specific .845" bore - I for years used the procedure 'camaroman' is refering to using a small 3-stone type with fine stones.
It is important to use a light oil and only make a couple quick passes to remove the major rust and defects and not effect the bore diameter and roundness.
I always deburr the lifter bore top and bottom very slightly to make sure no factory machined burrs exist.
I disagree with 'BillK''s statement 'they are too coarse
'... To the contrary, most small brake hones use a 240grit or finer stone. The stones on my small 3-stone hone are KD-266's and they are 320grit. KD also sells a smaller stone that is 400grit (KD2004). The "Lisle"#10050 stones are 240grit.
If you compare them to the "Dingle-Berry" type brush hones you will find they are all 180grit - I have looked for 'finer' small berry-brush types but, never found one.
The bottom line is any of these procedures will work depending on the amount of rust and how carefull you are about doing it.
I do fully agree with 'BillK's statement about $hit in the oil passages
No matter which procedure you use - be sure to fully inspect and clean the oil passages or you will be pushing all that ??? through the lifter bores when the engine is started and brought up to temp.
As always JMHO's;