Another CCT gone!

baldzone · Post by **baldzone** » Sat Jul 22, 2006 3:59 pm

Just replaced the front CCT after braking down on Tuesday 70 miles from home hoping that all the problem was is the CCT.

However, after popping off the front valve cover and noting the timing is well out I noticed the inlet cam follower (assuming thats what it is being about an inch in diameter) not moving back up with the cam when I turn the engine manually. Only noticed once I'd set the timing and fitted the CCT.

Please tell me this is not a bent valve! Or worse!

dookie · Post by **dookie** » Sat Jul 22, 2006 4:26 pm

Bad luck m8 got to admit it dont sound good

baldzone · Post by **baldzone** » Sat Jul 22, 2006 5:19 pm

I'll be whipping the head off in the morning to see how much damage it has done. Looks like I'll be looking for a cheapo runaround for a while!

delmeekc · Post by **delmeekc** » Sat Jul 22, 2006 7:07 pm

or not, i have a standard head if you need one, with the cams too as you need really to change the whole lot.

baldzone · Post by **baldzone** » Sun Jul 23, 2006 7:46 am

Thanks delmeekc, I may just take you up on that once I've seen how much damage is done.

Is it worth replacing the rear CCT while I'm at it? No idea how long thats been in there!

delmeekc · Post by **delmeekc** » Sun Jul 23, 2006 9:42 am

If the front head is coming off I would give it a full going over, so yes. Make sure you have a good set of torque wrenches for doing the whole job, checking the shims and bolting the head back on. Follow the workshop manual and should all be ok.

dookie · Post by **dookie** » Sun Jul 23, 2006 10:19 am

I think at Â£26 each anybody doing any major work or big service like the 16000m one would be wise to change both cts.

baldzone · Post by **baldzone** » Sun Jul 23, 2006 11:06 am

Couple of pics for you....

What are the chances of having damage the valve guides?

Looking at the piston damage (ringed) what are the chances of that failing in the near future?

delmeekc · Post by **delmeekc** » Sun Jul 23, 2006 12:55 pm

err dunno, dunno. have new piston too and maybe a new rod too plus the complete head.

It's one of those, well it's made marks and some thing has to give, piston is soft, valve stems are v thin, up to you but it's alot of work to put it all together, plus the expense, gaskets, oil, fluid and why take the chance.

I wouldn't but hey I want to sell you some bits.

dookie · Post by **dookie** » Sun Jul 23, 2006 2:34 pm

If it was me id buy the head of delmeekc and stick it on and try it , from personal experiance ive run pistons with much more damage than that and if there was a fight beetween a conrod and a valve i know who my money would be on to bend

baldzone · Post by **baldzone** » Mon Jul 24, 2006 7:36 am

Got the valves out and as you can see from the picture...

Still not sure whether to risk it with just new valves and a CCT. Will have a bit of research and ask some experts.

Post by **sirch345** » Mon Jul 24, 2006 7:51 am

Not a pretty site

dookie · Post by **dookie** » Mon Jul 24, 2006 11:16 am

I think if you look carefully theres a slight kink near the bottom

delmeekc · Post by **delmeekc** » Mon Jul 24, 2006 11:31 am

what does the guides in the head look like, looking up the port where the valve was. That's had a fair wack mate. stress to bend the valve would be on cam journals and piston against the small end and possibly big end shells.

baldzone · Post by **baldzone** » Mon Jul 24, 2006 12:22 pm

The guides look fine, as do the cams and associated components.

My old man races pre 60 singles and has similar sized pistons with worse damage from bent valves that have been reused and are still going strong umpteen years later.

I'll be speaking to a chap tomorrow who had a TL1000 that dropped a valve and see how much damage that caused. I know he reused the piston in question and it kept running with a lot more damage than what is on mine.

Until then I'm still undecided on what to do!