In the process of removing my head it seems some part of it got caught on this pin at some point. I believe C34022 is correct, its the pin on the cam sprockets that keeps them in place when detached from the cam, at least I suppose that's the only purpose.

It is slightly bent, like it's coming out of the sprocket. I only glanced at it, but it looked like the other one was either welded or maybe pinned/hammered in place. Seems like I could just do away with it, but for $7.00 I'd rather put it back together right.

Does anyone know how this pin is supposed to be fixed in the sprocket?

 

This is the parts drawing for the V12 camshaft chain, sprockets, etc, and I cannot find C34022 anywhere.



I am assuming teh Item #2 is teh pin/plate in question.

I have seen them welded, and peined over, so whatever happened on the day would have to be accepted.

Not needed really, BUT, if you are good enough to get those sprockets up onto those metal brackets before the chain tensioner ratchets outwards, you are blessed. I have jammed a shaped broom handle down in the works to hold that tensioner where it is, sometimes successful, sometimes not.

 

Sorry, I've been posting solely in the XJS forum for so long and I forget to mention the car when posting in the XJ6 forum and I've still not added it to my sig.

The car in question is an '87 XJ6 4.2l

 

OH bugga.

Same thing really, those pegs only accommodate the sprockets to slide up/down the alloy slot casti in the "rabbits ears" housing.

 

Great !!!


Thanks, Grant, I thin k I just figured out something. About 16 years late, but nonetheless !!!!!


When my DOHC went down in 2001 because of an over heat, it never ran again. Once home and a few days later, after I recovered somewhat, I took a compression test. Zero in all six!!!!


A bunch of bent valves. Very likely !!! But, why eluded me. I developed a suspicion, but never followed it down,


So, that diagram of the cam parts is so helpful !


Conclusion, The Vernier teeth joining piece 1 and 2 sheared. One or both cams bound in it's saddle and something had to give !!!!


Carl

 

I've been fighting two dirty fuel tanks. I think it was running lean and caused the intake valve to stick, which got bonked by the exhaust valve and bent it as well as cracked the valve guide.

Grant, I don't understand what you mean about the tensioner, but assume it must be specific to the V12.

I guess I'll take a better look at the sprocket when I have the time. Order the $7 pin and get a machine shop to replicate however it was installed as well as install my new intake valve guide.

Not sure what to do about timing though, I ziptied the sprockets to the chain. I suppose it doesn't matter, right? The engine is at TDC using the cam tool. So even if I didn't bother to market the sprockets and chains with some paint or a punch, all I have to do is put the cams back in using the tool, and turned the sprockets till they line up with the camshaft bolt holes. Is my thinking correct?

Not sure what to do with the fuel situation now. I thought I finally had good pressure, maybe this happened before I solved the issue (I only ran it once with "good" fuel pressure), but maybe I should reconsider how clean the tanks are. I do NOT want to do with job twice and count myself lucky there was no impact with the piston and a piece of the cracked guide didn't fall into the engine.