Cam tensioner fitted wrongly?

[Lobo]

Drew...

Further to Oddjob's post, with the rubber damper removed from the blade does the blade drop down significantly further?

If so, warm the rubber damper, wet it with oil, .... and try locating it via (eg) a piece of dowelling which enables it to deform as it enters the U bracket - before then pushing in the 'lubed' blade.

Just a thought...worst case it misfits / drops in the guts.... but you were planning to go there (again) anyways!

Simon

[Drew400]

Thank you Lobo,

All ideas greatly welcomed.

As Trigger said, learning.

Cheers,

D.

[Drew400]

Finally sorted it...

Had to split the crankcase to fit a gearbox part I'd forgotten, doh! (only the starter gear locking bolt & tab washer, so nothing important!!!!). Had to remove the barrels, thus I could be absolutely certain that the cam tensioner blade was correctly seated before eventually clamping it down (under spiring pressure from the blade) when the head finally went back on the rebuilt engine.

By the way, the manual says it's possible to work on the bottom end without removing the top end. Not sure how I would have got a torque wrench on the two crankcase bolts sited at the front of the engine below the barrels. The overhanging cooling fins would stop direct access hence decision to dismantle the whole bloody thing again.

Cheers all and thank you for your contributions... again, as Trig said, it's all learning.

D.

[Drew400]

True Oddjob...

I can only think that it wasn't seated properly in the shoe. When pushed down from the top of the cylinders, it appeared to engage and peering down with a torch (no endoscope available... nurse Julie?) I couldn't be sure. With the barrels off and the blade seated properly, it projects forward by c.30 degrees from the vertical. This leads me to think that, with the chain in place, I couldn't push it down at the correct angle to engage properly.

I was very reassured when reading the dismantling instructions that confirmed the cap is untightened under pressure from the blade's bending.

All I need to do now is see how this baby runs, although there's a big IF in front of that sentence!

Cheers, D.

[Nurse Julie]

Me and my Endoscopes have been in some very dark, tight places over the years but I have never thought about inspecting the internals of an engine with it !!! What an excellent idea. The other day when I wanted to get the swing arm bushes out after I had cut them with the hacksaw blade, I used an instrument called an Osteotome, used regularly in Orthopaedic surgery, fitted perfectly down the side of the bush to help remove it. All basic woodwork instruments really but perfect on bikes too. (These were old knackered osteotomes I hasten to add, didn't take them from the kit in the Operating theatre 

[SteveD CB500K0]

Had to Google that...

Looks like a chisel!

[Trigger]

Looks like something that my dentist would use.
Says its a bone chisel Steve.

[tom400f]

Had to Google that...

Looks like a chisel!

Same here. Thing is, orthopaedic surgery is sometimes rather like carpentry. I have a massive pin down the middle of my left tibia. I've seen the same operation on telly done on a femur. They just welly it in with a hammer. Don't suppose it's called a hammer in that context but you'd doubtless find one useful for fitting bearings...

[Drew400]

Thanks Nurse Julie (et al),

Does your industry have anything with a strange thread... as I seem to have inadvertently created here?!

Cheers, D.

[Nurse Julie]

Nothing specific for strange threads Drew, like most carpenters, mechanics, bodgers etc we just make a bigger hole with a tap and die  and put a bigger screw or bolt in it to hold it together and if in doubt put a bit of bone cement in it. I have a couple of dodgy bolts on my 400 where the heads have sheared off so I'm sure i will end up with threads not known to the engineering world !!!
Julie

[hairygit]

Nothing specific for strange threads Drew, like most carpenters, mechanics, bodgers etc we just make a bigger hole with a tap and die  and put a bigger screw or bolt in it to hold it together and if in doubt put a bit of bone cement in it. I have a couple of dodgy bolts on my 400 where the heads have sheared off so I'm sure i will end up with threads not known to the engineering world !!!
Julie

That's quite a scary statement Julie, having been in agony since some botched surgery last year:o Not so keen on getting it corrected now! lol

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[Nurse Julie]

Don't let me put you off Hairy, it's a shame it didn't go well for you but sometimes, like everything in life, it just don't work out well all the time. Better luck next time an fingers crossed.
Regards
Julie

[hairygit]

If I'm honest, I don't trust them anymore, misdiagnosis, mistreatment, left with permanent damage, given unnecessary drugs which caused a stroke, the list goes on! But none of it has put me iff Honda's, even though I can't physically ride my 750 at the moment, stuck with a Honda 90!

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[Lynx]

Drew,

I'm building up my spare engine now. Here's a picture of my cam chain rear blade. Too short if anything  .

[Bitsa (Ralph Wright - RIP)]

No if I remember right that looks good if the horseshoe is fully pushed back.So when the cap is on and you let the tension-er go it should adjust correctly.On another subject Hairygit I have total sympathy for you.Similar like you I let the french have ago at my back only because there super surgeon told me if I do not have it done I would end up in a wheelchair.Well 3 years down the line I am still some days days in agony and feel shit most of the time.The only painkiller that works is scotch.I can now walk a fair bit and I can ride my bike OK so I am with you all the way on this.I just hope in time you may return to some kinda normal and bearable way of life.
Keep your chin up mate
Bitsa