CB750 Barn find project - First Timer

[Nurse Julie]

Trig says drill it or put a tap down it and try and pull it out.

[Underdog1]

Trig says drill it or put a tap down it and try and pull it out.

Did consider drilling it but wasn’t sure if there was anything else to try first. Is the roll pin likely to be reusable after it’s been drilled?

[Nurse Julie]

No, there won't be much left of it. They are not available OEM anymore but I know Trig has a big trade pack of them in the engine building workshop.

[hairygit]

Why put ANY gasket sealer anywhere other than the top to bottom crankcase joint? a smear of grease on the gasket, then if it needs to come apart again it wont trash the gasket, Honda recommend fitting them with NO sealant.

[Nurse Julie]

I bet Hondaman was responsible for the gaskets being flubbered, I think he says use gasket sealer.........😭😭😭

[Underdog1]

I bet Hondaman was responsible for the gaskets being flubbered, I think he says use gasket sealer.........😭😭😭

Exactly that!

[Rob62]

Bit of bad luck there Ud.... hopefully you can get it repaired. I have a mate who is a wizard at aluminium weld repairs but he is in Hull  ... But those type of repairs are def possible. Try to seek out somebody who specialises in that type of thing.. Good luck !

[Trigger]

I would be welding that damage. Once the spring is under the correct tension it may break the rest of the case.
While the engine is out i would be investigating why the oil is not getting to the top end. It only takes a little sliver of Honda bond to block the oil ways and the jets. Check that you have all the correct 0'rings in place, as one missing or wrong size 0'ring will effect the oil pressure 

[Green1]

Never understood using sealant on gaskets. Why use a gasket if your going to use sealant? 
I always grease them even though it feels wrong its so right.   

[Nurse Julie]

Almost every Honda engine we get sent from USA for overhaul needs major welding. Usually where the chain has made a massive hole in the cases, all need fin repairs and general casing repairs but Trig does it himself.

[Underdog1]

I would be welding that damage. Once the spring is under the correct tension it may break the rest of the case.
While the engine is out i would be investigating why the oil is not getting to the top end. It only takes a little sliver of Honda bond to block the oil ways and the jets. Check that you have all the correct 0'rings in place, as one missing or wrong size 0'ring will effect the oil pressure 

If it’s getting to the oil filter but not up to the top does this narrow things down at all? Feel like I’m back to square 1 now if I strip the top end down again!

[Trigger]

I feel your pain. But, from what you have said, the oil has only got from the pump to the filter. That is about 8 inches 
There is no point solving the kick start when you still have other issues.

[Underdog1]

I feel your pain. But, from what you have said, the oil has only got from the pump to the filter. That is about 8 inches 
There is no point solving the kick start when you still have other issues.

I’m going to do some more reading on this, there’s a lot of threads out there with people struggling to get pressure after a rebuild and have got round it by fillin from the oil gallery plug on the rhs and pouring lots of oil in the top end. One suggested spending 15 minutes running the starter on and off to build sufficient pressure and some others said they just had to run the engine to get pressure as nothin else worked! Be nice to have a bit more assurance than a suck it and see approach 

[Trigger]

Don't believe everything you read, when it comes to getting pressure up on these engines. Never do it off the starter motor, it will burn it out. Never put oil in the top end, as you will never know if oil is getting there, if it is already put there.
Over the years i have built more than 200 of these engines and i have never failed to get full pressure. I have rebuilt a lot of engines were people have failed to get pressure 

As Bryan and Oddjob will tell you. We call most of these people Sunday mechanics in the trade. They will be in Halfords on a Saturday, try to fit the parts on the Sunday and would be in our workshops on the Monday, asking what went wrong and could we sort it 

You have just got to get in there and get it right. The pro advice is here on this forum 

[Underdog1]

Don’t suppose JB weld would have its place in this sort of repair (obviously clutching at straws here!)