CB400F Engine rebuild

[taysidedragon]

I bought a spare engine to overhaul or use parts from for my main engine.
It was reasonably cheap and you can see why from these photos! The tappet covers have been chiselled so hard that one has a hole in it. There's an awful lot of orange silicon gasket on the crankcase join.
I wonder what horrors I will find inside? 😳☹

[Greg65]

Ohhhh, what horrors lurk inside? If it’s just chiselled tappet covers and a bit of orange gunge on the oil filter and joints , ho hi, you’ve got a great spare. Have fun.

[mattsz]

I bought a spare engine to overhaul or use parts from for my main engine.
It was reasonably cheap and you can see why from these photos! The tappet covers have been chiselled so hard that one has a hole in it.

That one on the right looks ok - hopefully you didn't end up buying the world's most expensive used-but-good tappet cover... 

[Bryanj]

Just take the cam cover off, you will know immediately if its a boat anchour

[mike the bike]

Ewww.  Not much expertise in evidence.

[taysidedragon]

Some good news, some bad.
The cam, followers and bearing faces are good. Plenty of oil in evidence. The valves look like new.
The engine hasn't run since being assembled. Combustion chambers and pistons are as clean as a whistle.

However,  original Honda pistons look like they've been scraped with a knife, badly scratched crowns.
The bores are smooth and clean but no sign of any honing. The rings look new and the camchain tensioner horseshoe is free.

I'll get measuring in my next visit.

[Bryanj]

Could have new rings but not been glaze busted, you can do that with an appropriately sized flap wheel

[taysidedragon]

Didn't do much today,  I had an essential trip to Durham! 🤣

I did find this though. I guess they didn't have a clutch nut tool. 🤨 [ Guests cannot view attachments ]

[motty]

Some people should not be allowed to even touch a motorcycle, let alone work on one

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[Bryanj]

I must admit to having had to do similar, but not that bad, back in early 70's when special tools just were not available to buy unless you were a franchised Honda dealer and they would not order the "special" tools for you even if you were prepared to pay the high price

[BlackBomber400]

This is brutal


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[taysidedragon]

This is what was behind the oil pump. 😫

[Nurse Julie]

This is what was behind the oil pump. 😫

Is that yellow mastic 😥😥😥😥

[Bryanj]

Orange Heretite silicone i think Julie

[Nurse Julie]

Orange Heretite silicone i think Julie

It could be Bryan. We have found bathroom sealant, white and clear, gutter sealant in black and grey and a green substance which was unidentifiable whilst stripping customers engines. Its always a mystery what we are going to find next 😁😁😁 Unfortunately, the use of these types of goo usually indicate what has not been done correctly within the engine itself by some previous owners.