Jump to content


Logical1

Member Since 10 Jun 2009
Offline Last Active Jul 13 2017 10:27 AM
*****

Topics I've Started

My 81' 720 Daily Diesel Died, Researching Options

13 October 2016 - 12:33 PM

Been a while Ratto's! I picked up a 81' 720 Diesel with the SD22 about 2 years ago. It was a smokey slow bitch but I loved her dearly. I commute crazy miles for work and just after I hit 200k on the odometer she started knocking really badly. (yes I know its a diesel & I kept fresh oil and water in it) It lost about half its power, was a bitch to start and was smoking like a chimney, Checked the oil and water and neither had any contamination. It wasn't burning oil that much faster that it had been over the years and not over heating. This led me to think the rings had failed and it just wasn't reaching the compression it needed. I don't think its the head gasket but I ordered one anyway (hasn't arrived yet).  From my research the 81 SD22 has 3 rings on the pistons and I haven't been able to find a 3 ring kit. However Even If I could I don't have the time to do a full rebuild right now. That being said I loved the diesel for the mileage even though it was the slowest beast ever. I wouldn't mind re-building the diesel in the future...However I need to get this truck back on the road asap, so some questions:

 

1. Does a L-Series bolt into the 720? not looking to use the diesel trans, wondering if I can pick up a L-series engine/tranny and drop it in. (motor mounts?)

 

2. If a L-series bolts up, is there a specific oil pan for the fit? the sd22 has a raised part in the middle of the pan for the crossmember.

 

3. If the L-series bolts up , is there a tranny that doesn't require driveline alteration? 

 

4. I know the napz motors are normally in these trucks, Not a huge fan of the napz series. is there any other motors that bolt in?

 

5. Is it worth it to hold onto the SD22 and rebuild it? seems like parts are becoming unobtanium these days.

 

I'm looking for the easiest, cheapest, fastest route to a work truck. Should I try and resurrect the 720 or just find a cheap 620 and start back into my comfort zone of Gasoline and older models ;)