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CB400F Engine rebuild
Nurse Julie:
--- Quote from: taysidedragon on July 06, 2020, 04:53:30 PM ---Just out of interest, the manual says to replace camchain if 6mm longer than standard, but I can't find the standard length published anywhere.
I'm not going to use the old camchain but curious about how worn it was.
--- End quote ---
Lift the chain off of the cam sprocket and if you can see a gap between the top of the sprocket and the underside of the chain, it's well beyond spec. But to answer your question, I have no idea where it says in the shop Manual or Haynes just how long it should be 🤔🤔🤔
taysidedragon:
I did that before dismantling and there was some play, but I didn't pay much attention to that because there was no tensioner clamp bolt and the horseshoe was stuck.
taysidedragon:
I had a happy ending over the weekend, no, not that kind of 'happy ending!' 😁
I was preparing the cylinder head for painting and had to remove the rock hard carb rubbers from the inlet stubs. The screws would not budge. JIS screwdriver bits, releasing oil, impact driver, heat. None of them would budge the screws so I had to drill the screw heads to remove the rubbers. That left the threaded stubs sticking out of the inlets. I thought they would be a challenge to remove, but they came straight out, threads clean as a whistle!
The screw heads must have been 'welded' to the rubbers and that was the only thing stopping them coming out. I was very relieved. 👍
mattsz:
Bullet dodged! 8)
taysidedragon:
After dismantling and inspecting my spare engine I found that it needs nearly everything replaced. New pistons, rings, rebore, conrods, shells, primary and cam chains and at least one gear so it's been put back on the shelf.
I took my fitted engine out and dismantled it to find it is in better condition overall and just needs new rings, primary and cam chains. New parts to be ordered and engine re-assembled.
I wish I'd started with the fitted engine first, but it was easier to start work on the engine that was already out and on the workbench.
One thing I found on both engines was the pistons had been numbered backwards with numbers scratched inside the piston skirts. Now I know that as long as the components were put back in the same cylinder they came from it doesn't really matter, but it worries me that they might not have been put back right. What else was done wrong? Is this something that is often found when opening these engines? It really bothers my OCD! :o
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