oldgit
Well-known member
How long should I keep the heater plugs on before starting my luverly reliable Volvo 40A diesels.
lets go over there I am sure I saw a blue bit of sky
lets go over there I am sure I saw a blue bit of sky
A very very very techical question
- Thread starter oldgit
- Start date
hlb
RIP
Re: A very very very techical Answer.
It depends how long they need to be on. Count to ten, that should do It. Mine dont seem to need them at all. Car wont start without them. See what the boat thinks about it! Try a bit more in the winter. Are there any more ways of answering this question??
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Haydn
It depends how long they need to be on. Count to ten, that should do It. Mine dont seem to need them at all. Car wont start without them. See what the boat thinks about it! Try a bit more in the winter. Are there any more ways of answering this question??
No one can force me to come here-----------
----- I'm a Volunteer!!!
Haydn
DavidJ
Well-known member
Re: A very very very techical Answer.
Just following on from Haydn's reply. It's worth collecting some data each time you start up on temperature, number of seconds of heat and the number of engine rotations to start. After varying the parameters a bit I'm sure a pattern will form after a while.
hope this helps
David
Just following on from Haydn's reply. It's worth collecting some data each time you start up on temperature, number of seconds of heat and the number of engine rotations to start. After varying the parameters a bit I'm sure a pattern will form after a while.
hope this helps
David
oldgit
Well-known member
Re: A very very very techical Answer.
At the moment I am doing the business for about 15 secs on both.One engine starts straight away the other needs to crank for a least 30 secs longer,not a problem just curious.
lets go over there I am sure I saw a blue bit of sky
At the moment I am doing the business for about 15 secs on both.One engine starts straight away the other needs to crank for a least 30 secs longer,not a problem just curious.
lets go over there I am sure I saw a blue bit of sky
DavidJ
Well-known member
Re: A very very very techical Answer.
Now that is interesting because the difference is independant of temperature. I'm really guessing here but two engine differences I can think of are maybe compression ratios and maybe heating element temperatures. Is it easy to swap the heating elements over and see if the 'problem' swaps over or stays the same. That would either eliminate or prove that theory.
David
Now that is interesting because the difference is independant of temperature. I'm really guessing here but two engine differences I can think of are maybe compression ratios and maybe heating element temperatures. Is it easy to swap the heating elements over and see if the 'problem' swaps over or stays the same. That would either eliminate or prove that theory.
David
oldgit
Well-known member
Re: A very very very techical Answer.
Hmm that looks like work to me .Think i will add to my list of stuff to do during winter.
Just hold tight dear it will not be so rough when we get round the corner,trust me.
Hmm that looks like work to me .Think i will add to my list of stuff to do during winter.
Just hold tight dear it will not be so rough when we get round the corner,trust me.
G
Guest
Guest
Take them out and test them or disconnect each wire to them and test for continuity with a multimeter on resistance setting, the chances are that one or two may be burnt out, if they are fit 6 new ones at once, now this is a thought for you, I have had many an indirect injection engine bend conrods, blow headgaskets etc due to glow plug failure, what happens is that people turn the engine over for too long and the bores fill up with diesel then the engine hydraulics! you have been warned old git.
paul js.
paul js.
ccscott49
Active member
Paul,
You'd have to turn the engine for a long time, to get enough diesel in the cylinders to hydraulic the engine, surely? /forums/images/icons/shocked.gif
You'd have to turn the engine for a long time, to get enough diesel in the cylinders to hydraulic the engine, surely? /forums/images/icons/shocked.gif
DavidJ
Well-known member
I guess what happens is that the flooded cylinder does not fire up and the others do after that it's just a matter of time.
David
David
ccscott49
Active member
Yes, of course! With a bunch of diesel in there it won't fire, then Kaboom!! I should have thought of that!
G
Guest
Guest
Colin if you can imagine the engine has a flat head and nearly flat top pistons the combustion chamber is inside the head, most indirect injection engines have a lot higher compression ratios say at least 22/1 so it does not take long to blow the combustion chamber out into the cylinder bore ...... and the rest of the engine is history, I have actually got an engine here at the moment with this.
paul js.
paul js.
ccscott49
Active member
Yes, I can imagine, we are talking "Ricardo rocket" headed engines are we not, with seperate "swish" combustion chambers, IE, indirect injection. Just as an aside they used to be copper/bronze and exposed, so they could be heated with a blowlamp, to assist cold starting. Sorry Paul it was just a lapse, I do understand, just didnt think about the cylinder not firing and diesel just continiung to be pumped in, I was thinking more hydrostatic lock, than hydraulicing. Thanks for the reminder.
