Injector-Go-Round (Part 1)

I got back outside and started playing on the TDI's (Hapy the camperbus and Flash the daily Jetta) as the weather has been somewhat hospitable, though not consistently so. Since Hapy is running so well (still no codes, accelerator responding as one would expect, etc.), I decided to step up his injectors and get that Malone Tune I had dreamed about for years. In contrast, Flash has been making a plume of black smoke when he starts in the morning (after a long start cycle), so I figured his injectors had gotten pretty clogged up. My thinking: I can upgrade Hapy's injectors and put his under-100k miles injectors onto Flash to extend his life. Today's post is about picking, and removing injectors. I'm still perfecting both Flash and Hapy injector installs, so I'll post part 2 on that once at least one of them is running right. Good times.

Injector Selector

PowerPlus 764

For the uninitiated, like me, the world of diesel injectors or nozzles is cloudy and the choices not clear. For one thing, the manufacturers all suffer with varying quality because of their efforts to get them constructed at lower costs. As is true with any market, there are always new players. Some new players build good stuff, but have little recognition. Others are simply trying to turn a dime and build garbage, but have flashy advertisements. Like I said, all markets are like this, but for a product about which you know little, how do you avoid overpaying or getting garbage? This is where your trusted vendors are so important. For TDI stuff, I go to KermaTDI and IDParts first and then some others like PartsPlace or TuneMyEuro to see what they are selling. When they are all selling the same subset of the market, you can be fairly sure those are the better quality-to-price. In many cases, your greatest gains from an injector upgrade require an ECU tune, a turbo upgrade, or both. Regardless, my research indicates that they need to be balanced / pressure checked / set-up or you will probably not get the performance you were expecting.

To help me through the maze, I worked with the folks at Malone Tuning and researched my 2 usual forums: TDIClub and VWVortex. There really is nothing better than true end-user feedback, but in most cases, the folks who replaced their injectors were going from clapped-out original stock injectors to something new, so, of course, they worked way better. And, they only did that one set ever, so they only had the old crappy ones to compare against. Still, the forums helped steer me where KermaTDI and TuneMyEuro were already taking me: Bozio injectors are the market leaders right now, but even they have quality issues. So, having them set up will best ensure a high-performing set. I decided to have mine set-up by our friends at KermaTDI since that brought with it better guarantees and some things are just best done as a unit.

DLC 1019

I spent considerable time toggling back and forth between the DLC1019 and the PowerPlus764. I ultimately went with the PP764, but, in retrospect, they are both great injector nozzles from everything I have read. Here is another write-up of the PP764. Both injectors appear to have the DLC protective coatings that extend the nozzle life against lower quality and low-sulfur fuel. Knowing that the quality of diesel fuel varies across the country, this is important. The PP764 also has hardened surfaces, etc. to extend its life relative to the stock injectors (the DLC1019 probably does as well), and have a higher upside in terms of HP potential with additional upgrades. Ultimately, the TDIClub seems to feel that the PP764 may produce more smoke, but more power than the 1019, but again, as in so many things, your mileage may vary, and with all the other variables at play, it is very hard to distinguish between these nozzles... except for which one can handle larger modifications: the PP764.

I had Kerma set them up at the lowest "pop" stage, so they are fairly tame, which parallels the stock-for-now turbo. I should be able to replace the original VNT-15 turbo with a stock-in-some-VW's VNT-17 and the PP764 injector set up can remain the same. The 1019 may not embrace the higher boost as well as the PP764. Again.. who really knows? This feels like a job for MotorTrend's Engine Masters, if they ever give a whiff about performance in otherwise not monster engines... and diesels in general.

Injector Removal

still from KermaTDI vid

I had a rain-free, beautiful Saturday morning, with a forecast for decent March weather (read: spotty rain) all weekend, so I had my opening. KermaTDI co-hosts a great video on YouTube for how to remove / replace the injectors which I mostly followed. So, I am not going to go through all those steps in great depth here. Instead, I will highlight what I found particularly interesting. In the video, the glow-plug harness was removed at the very beginning. It was easier to remove once the injector hard-lines were moved out of the way. Getting a good angle on the bottom compression fittings on the injector pump was difficult, but not impossible, especially during initial removal. With the hard-lines out of the way, for the Hapy removal, I then had to remove the vacuum ball and the bracket holding it to the head in order to get to the clips for the 3rd injector plug-wire. This bracket did not interfere with the plug in Flash, but his plug was very difficult to get out of the bracket. With that unplugged, I shifted to the injector-hold-down brackets. On Hapy, I lost concentration for a second and pulled the bolt out of the 4th injector bracket independent of the bracket, causing the dished washer to disappear into the engine bay. This momentary lapse cost me some time searching.

I never found that washer, but it was nowhere near the injector so I moved on. Finding a single replacement washer took some time, though. For posterity, it is either part number N0231312 or N0237314. With the brackets removed, the injectors would not budge (no surprise). So, I cleaned up around them as much as I could with brake cleaner and a slotted screwdriver, getting as much black gunk off as I could. I felt this would minimize the risk of that hard yuck falling into the open injector port once the injector came out. I applied a short burst of Kroil penetrating oil around each of the injector-to-head mating surfaces to help in the extraction.

Injector Removal Tool

no worky

The injector has a M14-1.5 thread where the hard line injector fitting attaches. Metalnerd makes a slide-hammer specific for removing this injector that threads right on. As of this writing, they cost around $45US. Back when I was working on the dents on Zed (the 1978 Datsun 280ZX), I got one of those stud welder / dent slide hammer kits from Harbor Freight. This kit includes a 2-pound slide hammer with a single thread-on attachment that is designed to grab onto one of those studs. The thread on the slide hammer is M14-2. Soooo close to the injector thread, but not. I would rather re-use a tool in-hand rather than buy another rare-use tool. So, I got 2 nuts from the hardware store (M14-1.5 and M14-2) and JB Weld'd them together. I would have Mig welded, but welder one I used on Oliver's floors has disappeared into the tool collective of Travis' friends and I didn't want to wait. Besides, I'm not sure welding these nuts would have been a slam-dunk anyway. Turned out, the JBWeld failed on the first injector, so my tool became just the one M14-1.5 nut: I force-wedged it onto the slide-hammer and threaded the other end into the injectors. Yes, this cross-threaded the nut at the slide-hammer end, but it served it's purpose.

I'm going to stop here, and pick up the actual removal and install experience in the next post. Like I said above, the removals were actually quite easy. Like so many things, destruction is easy; construction is hard.

Gramps Clutch

Unrelated, I mentioned the clutch replacement for Gramps (2-dot-slow Jetta 3) a few weeks back when I was considering what work to do next. K2 decided that he wanted to hire that out, so we called up Courtney over at MobilePdx. We have called on these guys a few times over the years when our workload was more than we wanted to handle at once, and they have never disappointed. He and his guys (Lou and Joe) knocked it out, replacing the clutch, flywheel (old clutch blue'd the friction surface), throw-out bearing, the throw-out bearing cover, etc. Before they started the tear-down, the engine got a de-greasing. Once everything was apart, they replaced the rear main seal on the engine. With everything clean, they were able to lubricate things (like the shift linkage), and confirm the oil leak was the rear main seal. All in, it was a ton of work, but Gramps is running like a champ again. And, he is no longer marking his spot every time he parks. Thanks MobilePDX!

Last, an early shout-out to my local-to-NW Oregon friends: Hapy turns 50 on 3-September-2021, so to celebrate, we will be camping at LL Stub Stewart State Park that weekend. If you have little else to do for US Labor Day weekend, we (Hapy, Boo and I) would love to see you.

Thanks, as always, for following along and I'll post again once at least one of the 2 injector beneficiaries is running right.