Lister CD 8HP named Ray

Well the head weighs a bloody ton and when undoing the head nuts 2 main studs unwound as well as one of the rocker gear studs came out. Will fix these up after a clean up and some locktite. The bore measures up quite good actually. At the top just below the carbon ring it measures 4.499" which 0.001" under standard. With the piston at BDC (about the middle of the bore it measures 4.493" which is 0.004" undersize from the top of the bore. Standard size is 4.500"


Tomorrow I need to remove this side to get to the big end bolts. Is there any thing I need to know before undoing and removing the vertical shaft which is on the governor shaft?


How do I check the fuel timing before removing this side cover or is it a fixed setting?

I would check all the oil galleries for blockages as it is a pressure fed system as opposed to splash lubricated. I suspect the tightness would be from a dry bearing.

I have traced the oil pressure line a while ago and it enters in the crankcase next to the open door from the pressure relief valve. It then travels to the LH side main bearing then to the big end then to the RH main bearing and finally out and up to the pressure gauge. So oil you would think pass freely along those galleries in order to show full oil pressure. Still worth starting up the compressor and giving it a blast of air through there.
I am hopeful that it is ring gap too tight.

It certainly looks wet; it also looks scored. I hope I'm wrong.

Jarrod.

I believe your right about the scoring which explains the locking up. Tomorrow will know more

cobbadog,
You are right about the head studs. They are the longest I have seen,too.

Well the large cover does simply lift off and not effect any timing issues. I took so much care removing it as not having a manual to guide me this is what you have to do. I removed the large spring that attaches to the arm for the pump and this gave me easy access to the big end bolt on this side of the engine. Now with the piston out I can see what was locking up, the 'pisstin''. The scuffs on one side are not as bad as the other where it looks like it may have some chromium attached to it. I have removed the rings from the piston and online piston ring sets as STD are available as is a full gasket kit including a copper head gasket from Old Timer Engines in Qld. I now need to start cleaning all the parts up and make some accurate measurements and place an order for parts.
1st pic you can see what is behind door #2.
2nd pic shows the better side of the piston.
3rd pic shows the bad side of the piston.

Next is the big end bearing and bore.
1st pic shows the Big End cap half of the bearing.
2nd pic shows the conrod side.
3rd pic shows the bore. Not a good pic at all because of the light and no matter what I did could not get any better.
Basically there are some vertical scuffs but it is not too bad I dont think and should get away with a light hone depending on the numbers I find.
Again a lot to clean up here too so all this starts tomorrow and the wish list may continue.
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It's Dumb Question time,Cobbadog...

Is This a Crack, or a bit of the Old head gasket..??

Not a dumb question mate, it is part of the old gasket but thanks for looking closely at the pics. Nothing has been cleaned up as yet becasue I wanted to find the reason it was locking up, now I have done that and already sent an email away for the parts that I know I need and one part I would like to have if available.