Cahoon520 Posted March 5, 2010 Report Share Posted March 5, 2010 I have the chance to buy a 1981 720 diesel with 175 000 km with a 5 speed.<div>I was thinking that the rear end from my truck probably won't work because of the low gears. Would the rear end from the 720 fit in 520?</div><div><br></div><div><br></div> Quote Link to comment
datzenmike Posted March 5, 2010 Report Share Posted March 5, 2010 If you have the J13 engine you likely have the 4.875 rear end. Remove drive shaft at diff. Drain diff oil. Loosen both brake lines. Remove the four 17mm bolts behind each backing plate and yank the axle out about 6". Remove the 12mm nuts from around the rear diff housing and pull diff forward and out. Watch out it's heavy. Install in reverse order and fill with new GL-5 80-w-90 gear oil. Quote Link to comment
Cahoon520 Posted April 12, 2010 Author Report Share Posted April 12, 2010 Heres a update: The j13 removed and Diesel wiring installed. Cab Removed Frame Engine transmission installed Motor mounts My Old Man burnin' metal The cab back on with motor and trans in Then my wife's camera died so........... No more photos till Friday. The sd22 is a very tight fit there will be no mechanical fan. The drive shaft will have to shortened. We also had to cut the transmisssion tunnel. Quote Link to comment
74datsun620 Posted April 12, 2010 Report Share Posted April 12, 2010 This a very cool engine swap Quote Link to comment
Charlie69 Posted April 12, 2010 Report Share Posted April 12, 2010 Looks good. It looks like you have similar problems to my L20B swap into my 1966 520. Radiator clearance. Quote Link to comment
Cahoon520 Posted April 12, 2010 Author Report Share Posted April 12, 2010 Looks good. It looks like you have similar problems to my L20B swap into my 1966 520. Radiator clearance. Did you end up running an electric pusher fan? Quote Link to comment
datzenmike Posted April 12, 2010 Report Share Posted April 12, 2010 This a very cool engine swap From a technical and difficulty standpoint, I agree. Very cool and not often done. Quote Link to comment
Cahoon520 Posted April 12, 2010 Author Report Share Posted April 12, 2010 From a technical a difficulty standpoint, I agree. Very cool and not often done. Thanks This swap has gone pretty smooth. I could not have been done in my driveway the cab had to come off or else it would have been imposible. I had to swap the whole drive train from (engine transmision rear differential ) from the 720. I also had to use the glow plug controler and the injection pump controler from the 720. We had to make new motor mounts and we used the trans mount from the j13 worked we just had to cut a couple of inches off then weld it on. We had to cut quite abut out of the transmission tunnel and the drive shaft needs to be shortend 2.5-3 inches. Next weekend I am going to finish mounting up the cab repair the transmission tunnel bleed the brakes and swap the rear end. Then bring it home where I can work it on the small things in the driveway. I hope to be driving it by June. Does any one know where I can find a windshield for a 68 520? Quote Link to comment
fisch Posted April 12, 2010 Report Share Posted April 12, 2010 Great project! Love that you went diesel! Don't see that every day in a 520! Quote Link to comment
Charlie69 Posted April 14, 2010 Report Share Posted April 14, 2010 I plan on running a puller electric fan, however at this time I only have 1.5" between modded water pump & radiator. Water Pump Mod: Wataer Pump Mod My build thread clearance problems: 520 L20 Clearance Issues Quote Link to comment
Cahoon520 Posted April 14, 2010 Author Report Share Posted April 14, 2010 I plan on running a puller electric fan, however at this time I only have 1.5" between modded water pump & radiator. Water Pump Mod: Wataer Pump Mod My build thread clearance problems: 520 L20 Clearance Issues I have read your build thread. Thank You!! We have many of the same problems like the e-brake and the radiator. I think I am just going to take a pry bar to the lever and bend it till the transmission. I also think I can use the the fan from my j13 and if I get creative with how I mount the radiator I should have enough clearance...... Hopefully. Quote Link to comment
Cahoon520 Posted May 11, 2010 Author Report Share Posted May 11, 2010 ITS ALIVE!!!!:rolleyes: I t run on the fuel it had in in the lines. I have not plumbed the fuel lines in yet. So it is now a SD 22 diesel 520! It still needs to go to exhaust shop, a custom radiator made, drive shaft shortened,fuel lines plumbed, differental swaped, gauges wired up and I need to find a way to get a windshield from WA to Alberta. I hope to have this done in 2 months.:cool: Quote Link to comment
74datsun620 Posted May 14, 2010 Report Share Posted May 14, 2010 Its great to hear your Datsun is running with its new engine. Quote Link to comment
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