SOHC.co.uk Forums > CB750
Oil pressure issue / motor rebuild
royhall:
Thanks guys that's two contacts to keep.
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MCTID:
A long shot folks.........and I'm sorry that it's not about my venerable old Honda.
I have two Triumph 1970 650 Twin Crankshafts which I need to refurbish. Each has a cast Flywheel which is heated and shrunk on to the Crankshaft and held in place with 3 bolts. I think each Flywheel is cracked which makes them junk..........unless I can obtain the unobtanium - and find new Flywheels (hahahaha) - or I can find a Foundry who can cast some new Flywheels (using the old Flywheels as patterns) and a machine Shop who can make them fit.
Do any of you fine upstanding people know of a Company who might be able to assist me? I live in Lytham St Annes but TBH distance is no object (as long as its in the UK).
Trigger:
Always check the rods because once they start knocking, it can oval the con rods.
Trigger:
There is a company in Kent, Dial Patterns that could make the pattern for a foundry to fill. Don't mention my name as I still owe them funds ;D
MrDavo:
Thanks for the contacts, I'm not counting any chickens until I get her apart, but Trigger's firm in Bedford could be the way to go, I've had a look at their website, and I'm off to the Silverstone Classic in 2 weeks, so I could maybe drop the crank off on the way.
I still don't see why a big end would be intermittent, surely they clank all the time when they are shot? Maybe that thick 20/50 oil works better than I give it credit for.
I still have to find out why, and what the mystery sudden pressure loss is all about, or I'll be doing it all over again next year. Tomorrow the car will be banished outside so I can use the garage space and I'll start dismantling. The oil feed line feels a little squashed around the kickstart boss and footrest, I'm going to drain the oil by disconnecting the line at the oil pump end, and see what happens when I drain the tank while the oil is cold.
Edit:
Tell me more about the oil pressure relief valve, I see it mentioned in the similar thread by Yozzer74 - I now realise the one I checked and cleaned was in fact the leak stopper valve, also I checked the the sprung valve in the oil filter. Looking at this page:
http://cb750k2.honda4.nl/lubrication-system/lubrication-system.html
It seems there is another third valve which I haven't checked, and sticking can result in poor oil pressure. Worth checking first, or too late now?
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