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So I started finally to put engine back together, but forgot to oil everything up and had to leave it open for a week, and since this year it's been raining nonstop for the past two months, it developed some surface rust on cams.
So far I have used scotchbrite with wd-40 on gears that connect two camshafts and rag with wd-40 on lobes and journals. I have added pictures of the cams from worst to best. This is a daily with an OM642 engine. Hard to find any specific information on the issue so any input would be appreciated. Are all of those cams scrap or could I save some/all of them?
1. Camshaft
Went about 40 light passes over this with 2000grit sandpaper and WD-40, got a lot better but unsure how long would be okay to go over this until too much material would be removed, since I think all of them would clear up with some further polishing.
These are the worst teeth on gears after scotchbrite and wd-40, total about 12 teeth, some pitting on one side only. Should I touch them also with 2000 grit or rather not, how much stress would be on those and how deep is the hardening?
2. Camshaft
Not sure if this is pitting or just some wear that was there before. Around 10 teeth with same/less pitting than on 1. camshaft.
3. Camshaft
Same/less wear on journals/lobes as 2. Around 8 teeth that have same/less pitting than on 1. camshaft.
4. Camshaft
No pitting on gear teeth. Just some minor wear marks.
with that much hardened crud gone round the engine - it will be well past its best - much of that will now be embedded in the shell bearings - drive till it dies and don't worry
I would not worry too much about it.
Change the oil and filter after 1000 kms and you'll never see the rust again.
Sorry, fixed the first post with full sized images now. Yeah I'm planning on doing couple early oil changes, but wouldn't the amount of pitting create hotspots or immature wear? I just wouldn't want to do this job again.
with that much hardened crud gone round the engine - it will be well past its best - much of that will now be embedded in the shell bearings - drive till it dies and don't worry
Sorry I didn't realize that the images were thumbnails only, I edited the first post and fixed it. Did you mean that it has worn down so much that there are edges by the tiny thumbnails previously? If so then as you can see from the larger images its just the design, as the parts that make contact have different color and sides that don't have color are on the same level, can not feel any edge by the nail.
toast
with that much hardened crud gone round the engine - it will be well past its best - much of that will now be embedded in the shell bearings - drive till it dies and don't worry
you said they came out of your current engine.... cams are case hardened once worn it goes round the engine yes a filter is meant to help but some will be where it shouldn't be
this has lost 1mm off either a bearing journal or whatever it drives
you said they came out of your current engine.... cams are case hardened once worn it goes round the engine yes a filter is meant to help but some will be where it shouldn't be
this has lost 1mm off either a bearing journal or whatever it drives
Yes, I understand, but what I meant was that the whole surface that's below the edge doesn't make contact, so it hasn't eaten away that much, but the edge is there by design from new, only the discolored portions make contact with the journal, which is hard to see on that image, but clearly visible on other images, I have made black lines to see better where it makes contact, and from that to the not discolored portions, there is no edge that could be felt.
That thing is TOAST - I mean might be able to get polished both those surfaces need to be polished smooth w/o grooves, knicks etc. else it will tear up new bearings and lifters and then spit metal into rest of engine and waste all that hard work.
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Oil
That's what oil is for, to keep metal to metal contact from happening. I have assembled engines with a lot more pits then that and had absolutely no problems. That's what your bearing clearance is for. If you want to be sure, apply engine assembly lube to all the rust places before assembly. After start up and engine gets up to mid temp shut off and change out oil and filter. You won't have any problems. Joe
Im not sure if youre doing this in a garage or not but it has been a very wet year in many regions. You might want to use a dehumidifier in your space. Its hard to believe that this damaged happed in a week but nature is fierce and chemistry doesn't rest. Parts can be stored in bags or plastic bins with a light spray of oil OR just like lettuce, dont wash it until you are just about to use it (leaving the old oil on). Imo camshafts need to be perfect, hence the fingernail tests. Polishing down to the depth of those pit marks may take the bearings out of tolerance. Good luck op. Lots of work completed and youre almost there. We all have stumbles along the way.
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No rust/pitting before that.
Slight rust on camshafts
