engine rebuild - basket case- need advise

Anonymous-0

Well-known Member
I would like to get some opinions from you guys on how to proceed with this one.
Recently bought at estate sale is 1-C175 engine out of a 350 utility machine. The machine went off for scrape. The engine is mounted in a engine stand.
It is half way through a complete rebuild: that is
Crankshaft tuned and over sized bearings installed.
Rods installed with sleeves and pistons and rings ( all new). It sat this way for several years. There is light flaky rust on all the outside block surfaces. The inside off the block looks OK. Slight rust in the cylinder tops, but not pitted, rubs off.
Also, rust in cam follower slots, etc. Gears for cam and crank have surface rust. I pulled cam shaft and it has surface rust on lobes, very minor; more of a stain, no pits.
Crankshaft and pistons turn fine. Head is here and has been redone; greased and wrapped in plastic, new valves. Looks OK. Have all other parts in boxes.
So, question is, where to go now. ??
How can I be sure that NO rust particles get in the oil and bearings? Would magnets in the oil pan work? Should I pull the sleeves and crank and have the block hot dipped?
What is best way to be sure no rust chips get in and bind up the crank shaft?
Especially down in those oil passages I cant see into.
Any help here greatly appreciated.
tx in advance
dave
 
If it were me I would pull the caps, crank, and pistons. Clean the block good just like you would for a rebuild. Clean everything like you are doing a rebuild and lube it. Blow out crank passages and reassemble. Basically do it just like a rebuild without putting in new parts. That gives you the opportunity to plasiguage things and verify the work.

You never know how much junk is in the assembly lube. There's no need to have it dipped as far as I am concerned, just do a meticulous clean and check the clearances on things. Cleaning it good also let's you check for cracks.
 
I agree. Just no reason not to. A few hours redundant work not might save a full rebuild one houre after a startup. Cheap insurance. No gaskets have been used so far, no loss. Jim
 
Air guns have pressure restrictor ports to prevent blowing air into skin. The pressure is about 25psi or so. that will do just fine. Jim
 

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