now for the ve injection
things to notice:
1. oil filter and cooler housing are different allowing coolant passage to cold start device (csd) (wax pellet system similar to a thermostat but controlling cold start throttle linkage position)
2. power steering pump and bracket and no engine mounted reservoir
3. motor mounts are cast units not welded steel
4. air filter box on 720 has mounted baffle box, d21 is valve cover mounted
5. exhaust manifold is completely different shape and exit flange
6. intake has threaded section for air heater (720 uses dropping resistor by passenger headlight)
7. oil pan is single drain
8. starter (gear reduction on 720 over direct drive) (note gear reduction starter is longer and may not fit with d21 cast mounts)
9. front injection pump drive cover
10. water pump shaft is .25 inch longer on ve (don't quote me on that but water pump for 720 was .25in to short and water pump pulley hits housing)
11. transmission tail housing is completely different
12. fuel filter housing (d21 uses dual filter with heater and primer pump in one)(720 fuel primer is injection pump mounted)
13. cold start system (720 electric on/off/coldstart) (d21 electric fuel solenoid and csd linkage bumper)
14. injection pump rear cover (bolt up is 3 bolt on ve and 4 bolts on inline injection)
15.main drive pulley (ve is dampened with rubber and 2 belt, while other is 3 belt and solid steel)
16. alternator is interchangeable from both sd25's and td27 however the d21 body trucks have round plug and 60amp output while the 720 body has a "T" shaped connector and is 55amp. Also the vacuum pumps are different. The td27 and sd25 ve have the same vacuum pump however the oil pressure line on td27 in banjo and the sd25 is NPT. The td27pump banjo makes clearance for the turbo. I have installed the 720 alternator on the ve sd25 and it works but motor mounts make for clearance issues with the oil pressure and return lines, you will also need to jerry rig the plug.
17. vacuum pump (size/number of outlets is different but mounting appears to be the same as the td27t and the ve alternator, shaft length into the pump and spline appear similar never tried swapping)
18. the 720 has a torque damper attached to the transmission
19. td27 and sd25 VE both appear to have the same 3 bolt injection pump and mounting just has boost compensation
SO I will make a general note... after disassembling both types of sd25. it appears everything that bolts to the block is different but the lower oil block housing and oil cooler assembly that bolts into the block, the aluminium timing cover, valve cover, thermostat housing. The injectors are possibly the same
If you want more photo's of the VE diesel d21 look at thread here
http://nissandiesel.dyndns.org/viewtopic.php?t=2923
VIN - JN6JD12S9HW000291
and for the reference sake here is the VE injection pump numbers. This is a rotary injection pump not turbo compensated
line 1: 16700 14G03
line 2: 104740-4790
if you look close you can see previous owner had water pump pulley spaced out with washers to allow for pulley clearance. This is not correct as the center of the water pump shaft centers the w/p pulley. by spacing the pulley out it will increase the load on pulley studs and likely cause belt slip issues
here
4x4 sd25 oil pump
2wd sd25 oil pump
d21 body fuel filter assy. ( fuel heater, primer, filter)
