will a z24 automatic tranmission engine, work as a replacement engine for my manual transmission d 21?

[Truck Norris]

hello, my first day here and new to the datsun/ nissan world, and not a great machanic at this point. So bare with me for some of my questions. I have a 1987 nissan d 21 with z 24 engine. It has 440 000 kms, the electronic carb just packed it in. Got the same carb from a 86 d 21 put it in , but it wasn't taped out for one fitting with two wires coming from it. I don't know what that is, but aside from a slighty higher and sometimes fluctuating idle truck runs great. Any info on what that might be would be appreciated. It on the passinger side and the rear of two fittngs that were on my old electronic carb. I bought the engine from the same truck and am wondering if i can use it , with just changing the bell housing and putting my clutch tranny on it

[Dat Lurka]

If it's the same engine then yeah I don't see why not.

Wait

Hold on you're confusing the shit out of me. I thought you were swapping the trans..

Just leave your bellhousing on and it should bolt right in.

It's the same engine...

[datzenmike]

First, if it's an '87 D-21 it will have throttle body fuel injection. The motor (Z24i) has an i designation to reflect that. Please don't say carb if you have a Z24i.

 

720s after April '85 were equipped with Z24i motors. These Z24i motors are the same as the D-21 through '89. There are likely some small differences in the throttle body fuel injection and emissions systems but the motors are the same.

 

So you want to swap an automatic motor onto your 5 speed D21? ... correct??

 

Remove the automatic flex plate and torque converter from the 720 motor. On the end of the crankshaft there will be a removable spacer where the 6 flex plate mounting bolts go. It's there to support and align the flex plate and is NOT needed if you are using a flywheel for a standard transmission.

 

Z24 with auto flex plate spacer attached...

 

 

Z24 with flex plate spacer removed...

It should just slip or pry off.

 

Next you will need a new pilot bushing under $5. They look like one of these...

 

You carefully tap it into the hole in the end of the crankshaft.

 

Now you can mount your engine spacer plate, flywheel (use the flywheel bolts not the automatic ones) your pressure plate and clutch disc and finally the 5 speed.

 

Your automatic engine will have a small vacuum line down to the automatic modulator valve. You won't need it on your 5 speed so just plug the line or fitting. Usually located somewhere on the large hose going to the power brake booster from the intake.

.

[Dat Lurka]

Yeah that guy knows what he's talking about.

Just ignore me and listen to the vast wisdoms of Mike.

[HRH]

Why not just do a KA while you're at it? :D There is a lot of info on Z24 motors here. You can also check my build thread for more curiosities should you feel more adventurous.

 

http://community.rat...am-header-done/

 

 

Also, if you don't have to go through emissions, get a 32/36 Weber, or even a 38/38. Much better idea. No electronic feedback garbage.

[Truck Norris]

thank you everyone for the help. To clear things up yes i want to keep my 5 speed trans, and take my z24i out to put in a z24i engine which had an auto matic trans on it. Then i can always have a rebuilt engine on the side lines. And with 440 000kms I would suspect I'm not getting many more years out of it. lol its pretty bagged. No want to change to a different engine no matter if its better or not, just keep the same configeration as it came with (z24i and 5 speed ) and hopefully modify and tune alittle more the back up engine each time i have to swap. Maybe when i am seventy i'll be up to 200 horse power lol. I'm hoping for ten to twenty more horse power per engine swap. Also any performance tips would be nice. I'm hoping to have headers, better exhaust, ported head this time round. I have ported the head( mostly just cleaning up alittle opened up and straighter air path just where port and chamber meet) Was going to look at intake for a once over( its not going to help much from the quick look i did on it. The headers are tubular ones off a vauxhall i plan to try to use(free) but they'll be some cutting and bending work involved. There much lighter! I have time and not much money. The exhaust is yet to be thought about possibly but it will be minus cat and have performance muffer(most likey old and free)from whom ever i can. Hey dad i'll take your old race exhaust too I thought it was a package deal with headers! lol But if cheap mods are possible or just time on my end, i would like direction or advice to help me along. I thank all who take the time to post , or those who get a giggle from this project. I understand tuning more than just in general being a mechanic. Yes i'm totally backwards. Truck Norris is Truck Norris thats just the way it is

[Truck Norris]

First, if it's an '87 D-21 it will have throttle body fuel injection. The motor (Z24i) has an i designation to reflect that. Please don't say carb if you have a Z24i.

 

720s after April '85 were equipped with Z24i motors. These Z24i motors are the same as the D-21 through '89. There are likely some small differences in the throttle body fuel injection and emissions systems but the motors are the same.

 

So you want to swap an automatic motor onto your 5 speed D21? ... correct??

 

Remove the automatic flex plate and torque converter from the 720 motor. On the end of the crankshaft there will be a removable spacer where the 6 flex plate mounting bolts go. It's there to support and align the flex plate and is NOT needed if you are using a flywheel for a standard transmission.

 

Z24 with auto flex plate spacer attached...

 

 

Z24 with flex plate spacer removed...

It should just slip or pry off.

 

Next you will need a new pilot bushing under $5. They look like one of these...

 

You carefully tap it into the hole in the end of the crankshaft.

 

Now you can mount your engine spacer plate, flywheel (use the flywheel bolts not the automatic ones) your pressure plate and clutch disc and finally the 5 speed.

 

Your automatic engine will have a small vacuum line down to the automatic modulator valve. You won't need it on your 5 speed so just plug the line or fitting. Usually located somewhere on the large hose going to the power brake booster from the intake.

.

You are the man, thank you. Its a beauty day today up here in vic. Think i'll start on a mad max bumper lol

[Truck Norris]

You are the man, thank you. Its a beauty day today up here in vic. Think i'll start on a mad max bumper lol

Oh ya i was confused about the induction. It has z24i writen on air cleaner previous owner told me it had electronic carb. It looks like a carb with injectors in it. So i don't know what that makes it carb or throttle body? The injectors were 750 bucks each, through lordco or Canadain tire(although 175 bucks for same injector(same part number off a pathfinder or 300z) but i found the auto truck and used that set up on it. Works fine except idle is like its on choke till engine is warm. Not the worst thing, acually be better for winter in my eyes anyway.