SOHC.co.uk Forums > CB750
Oil pressure issue / motor rebuild
Trigger:
You could always get someone with strong arms to lift the engine by the barrels about a inch off the ground and then tap the crank case with a plastic/rubber mallet.
MrDavo:
--- Quote from: Trigger on August 04, 2016, 09:06:06 PM ---You could always get someone with strong arms to lift the engine by the barrels about a inch off the ground and then tap the crank case with a plastic/rubber mallet.
--- End quote ---
Sounds like a job for Big Leigh, from the photo at the top. Just come in from more ineffectual tapping and prying, no joy, that bugger is stuck - I was even considering using man's red fire.
MrDavo:
My engine stand arrived, thankyou Graham, the motor is in it now, all very smart and stable.
The barrels are well and truly stuck, the problem is time, rather than corrosion, but how the heck do people strip the projects are are rusted solid - my pistons are free but it still won't shift one iota!
No stand here, but this is me attempting to use gravity, with a ratchet strap hooked in the cam chain tunnel and to the garage roof beam. Its only a concrete garage< I got the engine swinging about, beat it around with a rubber mallet - later attempts included studs out and heat on the dowels in the front corners, also an attempt with a pallet knife. I gave up before I pulled the garage down from within! :o
I'm minded to give up before I do real damage and seek professional help, though I'm not sure who from yet. My local garage says I can use their hoist, but the guy worries that I'd break the cases or barrels before it pulls apart mechanically.
MrDavo:
Hi Oddjob, in desperation I took the studs out last night, I didn't mark them as I used 2 head bolts tight against each other on each stud to wind them out. I had put penetrating oil down first, but I saw no corrosion on the studs, There were a couple of 'pings' that made me think things were tight down there, but I'm no better off. I pushed the loose studs through a card so I can keep track of which is which.
The head and rocker gaskets totally delaminated, leaving half on each surface. I think the base gasket wants to do the same, but can't.
Stripping with the barrels on is a last resort, but I wouldn't fancy reassembling it that way. I've doe a bit of prying here and there but bottled it before I do significant damage.
MrDavo:
Before I try that, a friend who's in the bike trade suggests a chemical attack first - either thinners or Loctite 7200 Gasket Remover. As the head and upper barrel is such a mess I think I will get some.
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