knobby1 wrote:marc1234567 wrote:Ate you saying that is what might be trapped? Would pistons hit those? Isn't if just the valves that would make contact with the piston?
No...but if the injectors and glow plugs are still in there, it will have quite a bit of compression, we're talking ~18 or 19:1 compression ratio compared to ~9:1 for a garden variety petrol powered engine.
If the cam timing is correct they can still be quit difficult to turn over by hand.
Lord Knobrot
Jim Archer wrote:Were the cams pinned?
Jim
marc1234567 wrote:So , as compression builds it might cause it to become stuck? I guess we could try with longer bar ?
knobby1 wrote:marc1234567 wrote:So , as compression builds it might cause it to become stuck? I guess we could try with longer bar ?
Not stuck as such, but difficult to turn as the compression builds, if you stop & leave it for a few seconds until the pressure slowly leaks out via the rings/valves, it will then turn easier again until the pressure rebuilds, this is normal.
We're not doing something silly like leaving it in gear with handbrake on are we..?? That'll make it quite hard to turn... I've done this before..
Lord Knobrot
marc1234567 wrote:Handbrake is on but not in gear. I didn't turn it myself but it turned for a bit but reached a stopping point as though unable to go further. This was done with a pry bar if I recall. It wasn't that long . I didn't feel myself so unsure if it became suddenly stuck. How long would it take for pressure to leak from rings as you described?
knobby1 wrote:marc1234567 wrote:Handbrake is on but not in gear. I didn't turn it myself but it turned for a bit but reached a stopping point as though unable to go further. This was done with a pry bar if I recall. It wasn't that long . I didn't feel myself so unsure if it became suddenly stuck. How long would it take for pressure to leak from rings as you described?
Pressure should only take a few seconds to bleed off, you can often hear it "hissing" through valve seats and rings, there's no such thing as a "perfect seal" in this context......If she becomes "suddenly stuck" solid, you have problems other than compression build-up.
Lord Knobrot
marc1234567 wrote:So nothing can be obstructing the movement apart from the bent valve?
karl wrote:the valves don't bend
knobby1 wrote:marc1234567 wrote:So nothing can be obstructing the movement apart from the bent valve?
Correct, there's just nothing else in there....but as mentioned many times, these engines just don't bend valves....so if she's locking up..... and the crank, rods and pistons are still where they should be, the cam timing is out..!
There is one silly thing that might catch us out though...I wonder if she's dropped a valve seat or seven..??
Lord Knobrot
marc1234567 wrote:karl wrote:the valves don't bend
What might be obstructing movement then if the cam followers and bolts securing are in tact?
marc1234567 wrote:OK then. Many thanks. I guess the head has ti come off then.
karl wrote:marc1234567 wrote:karl wrote:the valves don't bend
What might be obstructing movement then if the cam followers and bolts securing are in tact?
their might be a problem, but its very very rare
if you have no compression the their is one or to things
valves pitted
valves bent if you used you own head and done the cheap way round to solve the problem
or you haven't timed the engine incorrectly
i dont know i int doing the job but if i was doing the job i wouldnt be throwing money at a head problem without finding the problems first
marc1234567 wrote:I thought head has to be removed to see what is wrong , at this point.
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