The DeLorean needs routine maintenance and the occasional, more significant refurbishing. Beyond that there are also a number of customizations and upgrades to improve performance, reliability and functionality.
Everything is pretty much done, so it's time to set up the initial MegaSquirt tune with TunerStudio. I also had to hook up some remaining cables, add fluids, fix a coolant leak, drain some bad gas, build some brackets and do a few other bits before I could finally turn the key.
After waiting too long for a muffler, I decided to build my own using off-the-shelf parts, with minimal welding and no bending, with the end goal being to have as quiet of an exhaust as I could make... within the bounds of every aftermarket part being labeled "performance", that is. It came out pretty good, but I have yet to hear what it sounds like...
Before I could wire up Josh's harness into my car, I needed to understand it, as well as make a few modifications for the automatic transmission and my particular car's electronics. This meant creating a new wiring diagram, after which I could replace the old engine wiring with the new and move closer to getting it started.
I'd installed some Dynamat before, but only in easily-accessible areas. With the electronics trays behind the seats removed for the EFI conversion, I had the opportunity to install Dynamat there as well.
Now on to the electrical modifications. The spark plugs go in pretty easy, and the coil-on-plug system fits just like the spark plug boots normally would. Before I could go any further than that, I would have to remove the old engine ECUs and related wiring to get ready for the MegaSquirt installation.
Vacuum routing on the 3.0L engine is simpler than on the 2.8L engine. In part this is because I removed the charcoal canister, so I no longer have a vapor recovery system (although I may add one later). I needed to hook up four things: the climate control vacuum reservoir, the automatic transmission vacuum modulator, the brake booster, and the MegaSquirt MAP sensor.
In order to pull the old ECU wiring, I needed to get under the center arm rest. This isn't particularly hard; it's mostly an issue of finding all the bolts, disconnecting all the wires, and making sure to move the harnesses away from the sides of the armrest before lifting it out.
The door struts are really easy to replace, but I spent a surprising amount of time trying to get the clip into the bottom of the strut in until I finally rotated it to point away from the car. After that the top end went on pretty easy. If not for that bit of trouble, this would have taken just a few minutes.
With the bottom of the engine swapped out and the top of the engine cleaned up, it now had to go into the car. Overall this wasn't too complex, beyond the trick of getting the transmission aligned with its mounts. It went pretty smoothly all told.
The fuel system was fairly easy to install. After relocating the fuel filter to the engine bay, I put the new fuel injectors into the fuel rails and mounted them back on the intake manifold, and installed that back on the engine. I built two new stainless fuel lines with AN-6 connectors to run from the rails to the existing hardlines in the car.
Right about the time I needed to figure out all the EFI hardware, Josh on DMCTalk.org just happened to be upgrading his 3.0L engine to an even larger one, and put all of his 3.0L conversion hardware up for sale. I bought everything that would aid in getting my 3.0L engine up and running.
In it's stock location, the DeLorean's fuel filter is not the easiest thing to get to, especially when rusted hardware is involved. I decided to relocate mine to the engine bay to make it easier to access, building new AN-style fuel hoses that would easily interface with my in-progress 3.0L EFI system. This also introduced me to rivnuts, a tool that makes it easy to add blind bolt holes.
I snapped off my automatic transmission's dipstick tube when reinstalling the engine and transmission into the car. Replacing it isn't too bad, and only requires a couple of bolts once you've raised the car and drained the transmission. Well, except for the fact that I stripped the bolt hole that holds the tube to the transmission thus requiring that I repair it first.
My automatic transmission always seems to leak, so I decided that while I was reinstalling the engine and transmission in the car that it would be a good time to replace the old-style cork gasket with a new silicone one from DeLorean Performance Industries.
While removing my engine, I noticed some surface rust. I soon found that a few points weren't just surface rust -- chipping away reveled a large hole on each side of the frame under the lower link arms. There was also rust inside some of the frame members, but the holes were what really concerned me. That meant welding clean metal over them, treating the metal, painting with POR-15, priming, and finally painting with a final coat of grey.
I didn't want to take the engine back out of the car once I got it in there, so before I went any further I decided to make sure the engine compression was good. This meant mating the engine and transmission so that I could use the starter to turn the engine, and learning how to use my previously-purchased but never before needed compression test kit.
Given the oil/coolant mix I was dealing with earlier, plus the age of the engine in general, I decided to swap out the water pump. I didn't realize just how little of the water pump is the pump itself -- the thermostat housing and back of pump need to be swapped with those from the 3.0L. Of course I stripped some of the bolts trying to remove the old hardware, but I eventually got everything assembled onto the new pump.
The rear main seal keeps all the oil from leaking out the back of the engine around the crankshaft. It's very hard to get to unless you already have the engine out of the car, and even then an engine stand can be in the way. Overall, I found the process easier than I had feared, with the most trouble being taking the engine off the stand so I could get access to it.
Installing the timing and valve covers is fairly straight forward. I wound up ruining my front main seal while trying to tap it in just a bit further, and had to replace it as well. The gaskets went on without much trouble with some Right Stuff, and I was able to reuse a lot of my stainless steel hardware from the 2.8L engine on the 3.0L covers. I also replaced the oil filter cap, but I still need to find an oil vapor separator to replace the one I broke when transporting the engine.
My 3.0L engine had a bad core plug on the back of the right hand head that needed to be replaced. They forgot to mention this when they sold it to me, but they were good enough to mark it on the tag and circle the bad plug itself in blue marker. I wound up having to tilt the plug out by hitting it with a punch and a four pond hammer to get enough force. Finding a new plug wound up being the tricky bit.
Flipping the engine over repeatedly caused the timing chains to slip off of the crank, so I finally had to bite the bullet and retime the engine. This was actually pretty simple, and I replaced the chains and tensioners while I was at it, although I also wound up replacing the oil pump in the process when I broke a bolt over-tightening its sprocket.
The gaskets on the valve covers need to be cleaned off before they can be reinstalled. One of them came off easily, but the other broke apart and needed to be tediously removed. This time I tried Permatex Gasket Remover on the remnants, which worked much better than I'd expected. It was also able to clean the blackened inside of the valve covers back to their original aluminum surfaces.
Mounting the cylinder heads requires that they first be clean and straight. A tap is used to re-cut and clean the threads for the head bolts before the gasket is placed and the heads and rocker arms are applied. With the 3.0L engine, you also have to be careful not to lose any of the tappets in the end of the rocker arm fingers. Then you just need to torque down the bolts, and you're all set.
With the lower crankcase re-assembled, I flipped the engine over and removed the intake manifold to find oil in the coolant passages. I had assumed the engine had been drained before it was shipped to me, but it seems this was not the case -- flipping the engine had caused the oil and coolant to mixed into a gunk that filled the coolant jacket. I had to remove the heads and thoroughly clean them before I could move forward with putting the engine back in the car..
Now that my 3.0L engine was right side up again, I thought this was a good time to take apart the top and see what was under there. I removed the fuel rails and harness, intake manifold, water pump and "Y" pipe to expose the valley.
With my newly-arrived gasket kit, I was ready to install the 2.8L lower crankcase onto the 3.0L engine, followed by the oil baffle, oil inlet assembly and oil pan. Besides some trouble flipping over the engine and forgetting to install the baffle and inlet before putting on the pan, this went off without a hitch.