Thanks for the replies guys, i certainly hope this thread is of some help to others in the future.
I think by tackling these projects it gives other owners a few more options as regards to overcoming engine issues etc that may otherwise be something they would not normally consider.
Anyway, here we go then.
I have aquired a d850 engine,(awaiting its collection/delivery at this time) its 90% complete and i am led to believe is a good runner( time will tell though) It has all its own ancillary parts etc from its original installation , a welding unit, but the previous owner removed the injectors & pipes to use on another machine otherwise a good engine, so the overall basic engine layout makes for a good donor engine.
There are a few areas that will need to be addressed though and i'll outline them now.
I have attached a few pics which if you look at , the following notes will become clear.
firstly, on the plus side , because its from a welding unit the sump is pretty well normal, unlike the units from regriferation trailers and marine installation that have totally different sump arrangments. That said i still cant use the sump pan fitted because the current oil dipstick is on the opposite side to my D750 and goes diectly into the sump pan from the side.
Solution, the sump pan from my D750 will retro fit without any problem, problem 1 sorted.
next issue, the intake mainfold is has a vertical intake, solution since the both 750 and 850 use the same stud layout and port configuration, retrofit my D750 intake manifold, problem 2 solved.
problem 3, due to the way the D850 was mounted in it last installation, the oil filler point was changed, instead of the oil being added from the top filler cap on the rocker cover, instead there is a filling point on the side of the engine just below the injector pump, basically replacing the cover plate.
Solution will be to remove the filler plate/neck and retro fit my D750 cover, and refit my 750 dipstick to the correct place on the engine block which has a rubber plug in it at present.
that would seem to deal with problem 3.
Problem 4 is a very similar issue to above, there is no factory fuel pump fitted, but the port is their and has a removable cover fitted, so same format as above, remove the cover and retro fit with my D750 pump as they would have both been the same , if the 850 would have been fitted with one, i think that deals with problem 4.
Problem 5, the speed control/govenor linkage etc on the 850 unit is wrong for my use,they are connected to solanoid fittings, but simply a case of swapping over the control arm/linkage etc setup on top of the speed/governor so i can control the speed from the foot and hand throttle.
I think that will deal with issue that but need to check the intrrnal govenor assembly to make sure .
Problem 6, not really a big issue, the bell housing is wrong , so another swap over of parts here, i think the starter motor by not fit correctly with my bellhousing backplate so i may be swappping starters also, i may be wrong but i'll update you accordingly on this issue.
Another issue , is this, the alternator is mounted on the top left on the 850, whereas it is on the top right on my 750, the only way this can be overcome is by using the top mounting fittings bolted to the top of the cyl head at the front right hand side, which are currently on my 750 unit, so to ensure everything fit corectly, i will just transfer across all the required parts from my 750 and this should allow for a problem free refit of the engine into the B7100 engine bay, that should be that sorted.
Everything else is pretty well sorted and doesnt require any mods or retrofitting, but you never know, if i fine something out , i post it up here also.
the oil filter is in the correct place and the cranckshaft pulley wheel/shaft is correct also
One thing i must say is this, it appears from my goundwork so far that because the basic engine format of the D650-750-850-950 are all 70mm series engines, and as such share a common set of features, but, due to the the very large range of machinery etc that they are fitted in, the final build configurations of them can vary wildy.
they are used in so many applications etc that the amount of work required and changes required to make a given model retrofit into a B7100 for example can vary for a few mods or swap over of parts, to much more major changes that may not even work out in the end.
The unit i have chosen is a happy compramise, the changes are relativley straight forward on the scale of things as the basic lump is standard and the offending parts can be interchanged etc, other units may be easier with less to change if any, but refrig and marine units may be more work than is really viable.
Just a note to anyone who has any of the " for example D750-A" series engines , these "A "(agriculture) series engines do not have the waterpump setup as found on the "B" versions which is what is fitted to my B7100 and also on the 850 engine i have aquired.
Allthough the same method of swapping engines and retro fitting could be used for owners with D650-750-A etc, there will be an issue with the radiator, this is due to the "A" series using a larger diameter size radiator hoses, and what compounds the problem is that the radiator inlet/outlets will be a larger diameter also becuase of the thermo method of circulation , whereas, on the "B" series engines with the pressured/ pumped setup the hoses are a smaller diameter along with similar size radiator fittings.
So then, I hope by now after this long reply you are not all bored to tears and i certainly hope that i have not put anyone off doing the same.
I think it will be well worth the time , work and effot put in.
I'll update you all as i progress on with it.
pics attached
