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Brads 720

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smooth620 View Drop Down
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HAWK EYE

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Post Options Post Options   Thanks (0) Thanks(0)   Quote smooth620 Quote  Post ReplyReply Direct Link To This Post Posted: 28 Mar 2014 at 4:38am
Removing the cam to replace the head gasket isn't necessary but you will have to remove the cylinder head. A service manual will help a lot.
Better to learn from other peoples mistakes than to make them yourself.-Anonymous

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bradswindell180 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote bradswindell180 Quote  Post ReplyReply Direct Link To This Post Posted: 28 Mar 2014 at 9:58am
Thanks smooth but i have to take the head to the get it decked so it needs to come apart . The book that i got doesn't tell how to take the cam shafts out and i don't want to f*** it up .The L20 head was a walk in the the park just going to have to figure it out.
eat.sleep.datsun.
78 620 L20 auto
86 720 Z24 auto
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Braden620 Quote  Post ReplyReply Direct Link To This Post Posted: 29 Mar 2014 at 9:54am
Must I do everything for you?  Use a hammer. lol.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote bradswindell180 Quote  Post ReplyReply Direct Link To This Post Posted: 30 Mar 2014 at 11:51pm
Ha ha Braden, i have been doing some reading and i think i got the just about how to take it apart .
eat.sleep.datsun.
78 620 L20 auto
86 720 Z24 auto
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Braden620 Quote  Post ReplyReply Direct Link To This Post Posted: 10 Apr 2016 at 11:04am
Update on this truck. Brad installed a new head gasket on the original Z24. Truck ran fine for awhile and then developed a rod knock. The original Z24 was removed and a donor Z24 was installed, ran great for awhile and low and behold another head gasket. At this point I think we were both fed up with head gasket issues on the Z24 and  just the Z24 in general.  Since Brad has decided not to repair his 620 to driving condition we have decided to swap in his KA24DE into the 720.  We have made good progress over the last 2 days. So far we have,
  • Removed The Z24 And auto Tranny
  • Removed all engine bay components
  • Removed wiring Harness
  • Test fit engine and transmission
  • Fabricated engine mounts to accommodate the KA24
The KA will now "bolt right in" to the 720. We had to relocate the drivers side 720 (frame) engine mount and re angle the KA engine block mount. The Transmission lines up nicely with PLENTY of room around the bell housing to bolt it to the block. The shifter location is excellent. We plan on modifying a truck shifter by cutting it and welding it to the car shifters base (pictures of this to follow). I have seen several guys use the 720 manual transmission in the 720 instead of the newer FS5W71C Car tranny, why they do this is beyond me as the car transmission requires minimal modifications to the mount/crossmember to work and you get the benefit of the newer shifter style which is far less sloppy than the old bushing type shifters.  The last big hurdle to jump with this swap is the oil pan.  The front sump from the car does not clear the centerlink or the sway bar. I'm afraid we are going to have to go full custom to make it work. Other than the oil pan we are only some clean up and paint away from bolting this engine in for the last time and starting to hook things up. I am going to work on the wiring this week. We will NOT be using a can am box on this build but rather some OEM relays and a fuse center. 


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Post Options Post Options   Thanks (0) Thanks(0)   Quote Braden620 Quote  Post ReplyReply Direct Link To This Post Posted: 10 Apr 2016 at 11:06am
If we ever forget that we are One Nation Under God, then we will be a nation gone under.
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Braden620 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Braden620 Quote  Post ReplyReply Direct Link To This Post Posted: 10 Apr 2016 at 11:09am
Luckily we are going to be able to use many stock parts including the heater hoses, radiator hoses, radiator and the fuel supply and return hard lines. We are also doing a front end rebuild while we have everything apart, there was considerable wear on the center link and idler arm. We are going to try and adapt the KA AC compressor to work with the factory 720 components. That should be an interesting project. 

Edited by Braden620 - 10 Apr 2016 at 11:10am
If we ever forget that we are One Nation Under God, then we will be a nation gone under.
Ronald Reagan
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Fast720 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Fast720 Quote  Post ReplyReply Direct Link To This Post Posted: 18 Sep 2016 at 11:53am
No updates ? what's happening ?
I got A/C with my doner D21 and would like to install it in the 720 , but the condenser is way too big , spent a couple of hours at the wreakers looking for a smaller one and no luck , and can't get a new one either .
A/C is a nice option , so updates please ............
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Braden620 Quote  Post ReplyReply Direct Link To This Post Posted: 24 Feb 2019 at 9:36pm
Fast,  Not sure what pictures were on this thread. Update is, truck is done and has been on the road for awhile. Swapping the KA24DE into the 720 was much more difficult than a 620 swap. The wiring is vastly more complicated and many other obstacles had to be overcome. The most challenging part about the swap is the oil pan and steering modifications. I did not use a can am wiring box on this swap, probably could have but would have been just as hard to figure out how to make the can am box work as it was for me to just wire up. The power increase compared to the Z24 is awesome. Needs a turbo. I have a spare t28 laying around... 

As far as AC is concerned, this truck has its stock condenser in place still and the stock evaporator and system up in the dash still. I left the wiring in tact for the AC in the KA24 harness. There isn't much to it, just a few signal wires to bump up engine rpm when compressor is engaged.  The stock KA24DE compressor could be bolted up and plumbed into the 720 system.  Probably best to adjust the refrigerant charge by means of pressure rather than weight. My guess is the 2 systems are similar in capacity to begin with. Brad just needs to get a new filter dryer and plumb everything up. I could wire it up in a few hours. 



Edited by Braden620 - 24 Feb 2019 at 9:39pm
If we ever forget that we are One Nation Under God, then we will be a nation gone under.
Ronald Reagan
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Post Options Post Options   Thanks (0) Thanks(0)   Quote 520KingCab Quote  Post ReplyReply Direct Link To This Post Posted: 04 Mar 2019 at 9:38pm
Good work on the motor, it looks good. I am building a 620 King Cab 4 wheel drive right now. When I can get to it I will post some pictures on what I have got done so far. Last spring my family and I were driving from Gatlinburg TN to Louisville and we stopped in at the Castle and Key Distillery in Frankfort. Noticed a sign on the highway for Somerset while driving and remembered seeing a previous post that you were from there.  Wayne Hansen 

Edited by 520KingCab - 04 Mar 2019 at 9:39pm
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