Just a suggestion, I've taken apart high mileage engines with better looking bearings than yours., inc the other one at the RHS of your photo with also looks a bit scored, but if you have trash circulating in the oil, might be that causing the damage?
The pic from the internet,shows the bearings in line. The main one in the middle has a hole at the top. So does mine, but the bearing with the hole in, is still in the other case half. My bearings are identical to the internet pic, but oversized as the case had the align bore.
Yes, quite possibly that reason, but Imcant see where the ‘trash’ came from,unless it was from the ‘newness’ of the new crank and dizzy gear. It’s the only rational excuse Imcan think of. Everything bedding in,so to speak.
So bad it's good in a funny sort of way. Last ones. Arrows point to where the rods hit the case, It's clearanced but not in the right place. This would have been the noisiest one. There is more bad case hackery, but I'll stop there.
Just no! chunks don't break off as an engine beds in! Silvery sheen in the oil from rings bedding in, which is why first oil changes are after a few hundred miles or less, anything else is a problem.
I crated it up and sent it back for him to look into it. He said he's stripped it to look. I doubt he did knowing what I know now. When I said it couldn't pull the skin off a rice pudding he sent me a set of ratio rockers. Bless.
That’s a thought. I washed it all out when I gave it to him, but not when I got it back. I did have to re split the case, to put the new cam followers in, I didnt notice any bits, though but the tray of oil in my first pic, has a ‘gold sheen’ to it. Looking at the dizzy gear on the crank, it looks fine with no wear. So you think that main bearing is suspect? I’m a bit confused with it all,tbh… Sorry, still havnt looked properly, and just woke up early.
On the right hand side? There is no bearing. This is the engine case, hence the location pin…it’s where the thrust bearing goes,which is still on the crank, at the time of the pic.
Two thoughts: Ah well its OK really: The oil sheen is maybe excessive wear at initial running but might have vanished after an oil change. The bits of metal are previous shrapnel that was not cleaned out from lying in corners of the engine, the strainer stopped them from going into the block. A couple of oil changes and it would have been OK. Or a nightmare: If somebody had trashed a piston and created a lot of shrapnel in the case before you sent it for rebuild, it's quite possible the oil galleries had many small bits and pieces in them still(should be very fine but if the strainer isn't perfect , they could be larger) . However my oil pump downstream of the strainer had nicks in the gear teeth where it was eating fairly solid metal when a piston vanished.. Washing out the case clears the bits you can see. But for the oil galleries ideally you take the plugs out and poke them through with gun bore cleaner brushes and then drill and tap the holes carefully and screw in tapered plugs. Or back flush with a nozzle on a parts washer until all the stuff comes out. On my part water filled engine block there were flakes of corrosion big enough to not make it out of the oil galleries - there shouldn't be that problem here at least. If the strainer did its job there are just filings in the oil galleries .. not good but survivable with frequent early oil changes.
Good answers. When the block went in for its alight bore, because of excessive end float, the pistons were fine. The strainer is a fine strainer, not a course one, so I’m guessing that not much wen through into the oil feed system.However, it will all be disassembled later when I get back from work for a real good clean, using high pressure airlines and brake-cleaner, as that’s all I have. obviously, I need to cure the problem. Would you say I need another set of mains ,as the middle one shows signs of pitting, or would you say that eventually I will wear in evenly,as it’s only done 30/40 odd miles, so far?
I went to bed before you (I'm one hour ahead) and got up after you (I'm retired) to another tale of woe. You ignored my advice to inspect everything as you took it apart so now, even if you find where the debris comes from, you probably won't know what caused it. What I see from the pics - A wiped bearing. You know what causes that because I told you before. When you rebuild an engine the oil pump and all the oil passages are empty so unless you have an external way to pressurise the oil system the engine rotates with no oil until the pump sucks oil from the sump. A gear pump doesn't suck very well when it's empty and I always pack it with petroleum jelly (not grease) before starting an engine. And I remove the rocker gear to remove the load on the cam and followers and turn the engine on the starter to build up oil pressure. The bearing also has pitting from debris in the oil and should be replaced. The sheen in the oil is probably from the rings bedding in as Steve says. On a Type 1 with no oil filter relatively large particles passes straight through the strainer and the mesh is larger than bearing clearance increasing wear. I can't believe you built the engine without cleaning the crankcase after it had been machined and knowing that, it's not unreasonable to believe the debris is machining swarf. The problem you have now is cleaning it out after it has been pumped throughout the engine.
Ok. Guessing my haste got the better of me, to get it on the road? So s good clean and new bearing/s and pay attention to the pump suction.
