So this is what caused my breakdown

bjmullan · Post by **bjmullan** » Tue Jan 22, 2008 10:16 am

Guys I could do with a nice freshly build 2.0L engine....willing to pay the postage & packaging

That's the DDK spirt

fourteener · Post by **fourteener** » Tue Jan 22, 2008 10:32 am

Sorry to hear about the engine James, that's really bad luck. How did Barrel #6 get damaged? I thought maybe #4 might have caught some shrapnel as it's directly opposite.

Gary71 · Post by **Gary71** » Tue Jan 22, 2008 6:53 pm

This is real bad luck

But good to see the DDK spirit to the rescue!

oh and I could do with a set of 2.4E barrels, pistons and cams if anyone has some lying around

58A - 71E · Post by **58A - 71E** » Tue Jan 22, 2008 9:35 pm

Thanks for all the offers of help guys

James (fourteener) - sorry, typo, meant to say cylinder number 4

it did indeed cop for the shrapnel

Barry - yes an inlet valve seems unusual, not sure if the valve guide has got stuck / failed somehow? also noticed that cylinder number 1 is dated 11/70 whereas the others are all 12/70, not sure if coincidence but maybe it has been replaced previously? I think I'll be speaking to JohnM's apprentice in Kendal Re the conrods

Barry you have a PM following Chris' generous offer, and as for loosing time, well, I thought I'd crack on

This is what I've fished out so far

Just putting the shopping list together now

Alan you have PM

Bootsy wrote:Hurrah for DDK!

Indeed - gotta love DDK

butzsi · Post by **butzsi** » Tue Jan 22, 2008 10:27 pm

Guys I could do with a nice freshly build 2.0L engine....willing to pay the postage & packaging

Brendan, Sorry only a 3.0 RSR available - postage approx £9.56 plus vat !

Chris

Alan @ CanfordClassics · Tue Jan 22, 2008 10:42 pm

Sorry only a 3.0 RSR available - postage approx £9.56 plus vat

Gary71 · Post by **Gary71** » Wed Jan 23, 2008 7:43 am

I love to see this pace of work, nothing like just accepting it's got to be done and cracking on into it

bjmullan · Post by **bjmullan** » Wed Jan 23, 2008 11:19 am

That a shame Chris about the RSR engine but I have a mint T and with all these recreations it's now becoming a rare model

I could of course dump all the MFI, slide valves and twin spark thingys and put my trusted Zenith on.....

210bhp · Post by **210bhp** » Wed Jan 23, 2008 7:30 pm

bjmullan wrote:That a shame Chris about the RSR engine but I have a mint T and with all these recreations it's now becoming a rare model

I could of course dump all the MFI, slide valves and twin spark thingys and put my trusted Zenith on.....

Brendan
Just put the rsr stuff in a box after you mount the Zeniths and I will take them. Willing to pay postage of course.

Regards
Mike

58A - 71E · Post by **58A - 71E** » Thu Jan 24, 2008 11:41 pm

So I did a bit more investigating today as I really want to get to the bottom of why the inlet valve dropped...

I always wondered why, after adjusting the rocker clearances as accurately as I could why the engine still sounded tappety - well it turns out that my valve guides are well and truly sh*gged so the noise was in fact my valves bouncing around

and then I turned my attention to the timing chains.
I replaced the tensioners with new 930 types and when the engine detonated these were the first things I checked. Unfortuntately, when I replaced the tensioners and chains I did not split the case and therefore inspect the Intermediate gears - well I probably should have done given how badly damaged/worn everything else was - especially as some numpty had installed the cam pulleys in the wrong way round - consequently this shouldnt have been a surprise

Top 3 teeth missing and rest nearly ground away

Difficult to see in the photo - but basically the chain has made a good job of completely knacking all the intermediate shaft cogs. So, it looks like the chain probably did cause the detonation by jumping , but not because of the usual chain tensioner failure, more because I didnt replace the intermediate gears to save splitting the case

I reckon anyone replacing their slack chains should check their cam pulleys AND intermediate shaft pulleys at the same time. I wish I'd split the case then

Matt black70 · Post by **Matt black70** » Fri Jan 25, 2008 12:06 am

Glad to see you've found the root cause so it won't happen again, your findings could also save somebody elses engine in the future . Is there a way of checking play/ backlash without stripping the case?
I hope the rebuild goes well.
Regards
Matt

bjmullan · Post by **bjmullan** » Fri Jan 25, 2008 12:08 am

Well at least now James you know the reason, and it's a good lesson for us all to learn. BTW you really didn't take long to strip that baby.

Gary71 · Post by **Gary71** » Fri Jan 25, 2008 7:37 am

It's a real shame you are doing all this learning for us, but I will certainly take your advice and try to get a good look at the intermediate gears when I do my chains this week.

I feel a sympathetic pain in the wallet for you

hot66 · Post by **hot66** » Fri Jan 25, 2008 9:13 am

are you going to replace the aluminium gear with a later steel one?

58A - 71E · Post by **58A - 71E** » Fri Jan 25, 2008 9:36 am

James, I've already replaced all 3 cogs with original types, a bloke in Kendal

had some lying around with no wear on, I'll replace the chains again at the same time and hopefully they should last better!