" I am not anywhere near being comfortable with taking an engine apart "
FP's are pretty basic . theres a pin / slot for liner alingnment . Chamfer in rod big end goes against the crank web ( forward )
Justa founda this . Good for a read , anyway .
https://www.youtube.com/watch?app=desktop&v=hHo51FObdIg Disassempling and re assembling OS fp 40 and Tower 40 engines 190726
A decent allen key, hardened . A soft one will soon round off .
A small V or - scraped to the piston front on top . NOT to the edge . So it can go in frontwise again .
Often the gudgeon / wrist pin , sticks a bit . In the rod. If its sat aeons . The nylon wrist pin pads will loose theie ends if you pry them out without warming the pin assy. BE WARNED ( so dont pull the white nylon pads )
The sticky wrist pin and mild corrosion on it, needing polising off . a brief rob with 600 wet & dry , if needed . Polish shiny on 1200 W&D.
WHY ' we ' pull the wrist pin pads, is to stick a piece of wire through , to do the above . Holding it with forceps etc . P I N G , & its gone . into the rafters or some such . Brings us too
CLEAR THE BENCH beforehand . Put out a few paper towels or sheet of paper , to lay it all out .
Soak & clean all the bolts , Then oil . Clean the crank & crankpin ( if its all gungey ) with maybe 3M green pot scourers. slightly used . then if needed polish . AND the wrist pin holes in the piston
with a 5 mm strip of 3M puledd into & twisted through .
Delacquering old diesels , the last 3/32 of the sides at the crown was left untouched, on some, for the seal .
Castor Oil Rich ( 1/3rd ) and a good hammering for heat on the NINE INCH PROP on the Fox may reseal the crown in two or three runs . The heat atracts castor. Crowns Hottest .
All pins/ journals should be free but not slack. dont SCOUR OUT OVERSIZE . just carefully clean off deposits .
thisisupthetop ofthe board here .
https://stunthanger.com/smf/engine-set-up-tips/list-'your'-set-up-for-the-os-46la/ similar on FPs which are similar , elsewhere, in SEARCH .
DONT STRIP IT , if its clean & oiled . Gungey as heck & it may pay to.