Here's the response from Kano Labs:
A. Kreen will improve the seals
B. Never experienced this problem Kreen will soften carbon deposits
C. No-But when purging only run the engine for ½ hour and then drain oil and replace with fresh oil.
The other day I decided to try the cylinder soak since my snapped linkage forced me to let it sit anyway.
I did a compression test first (just got the kit!), although the engine was NOT at operating temp. It had sat for a couple hours. It was a long day and I hadn't eaten much. So shoot me. Here's what I got:
1 - 245
2 - 180
4 - 300
5 - 200
3 - 260
Not very exciting, even if you add the 10-15psi that I've heard other people suggest for a cold engine test.
So, I put a little under an ounce in each cylinder (b/c at least 20% dripped out) and put the glow plugs back in just a tad, and 15oz in the crankcase, and then cranked the starter twice for about 10 seconds each time.
I let it sit overnight and then ran the engine for about half an hour, as directed, and then changed the oil.
I then added the remaining 11oz (some spilled) into the crankcase with the fresh oil and went on a 250-mile round trip drive to Olympia.
The blow-by is not any better.
However, I checked the compression today at operating temp and was very excited by the results. I know that this isn't going to be the best indicator because of the cold and warm engine temp inconsistency, but I don't think the drastic increases in the 2nd and 5th cylinder compression readings can be attributed to that alone. All the above and below numbers were repeated twice in a row for accuracy:
1 - 260
2 - 240
4 - 330
5 - 280
3 - 290
Still not great, but I have hope!
I'm leaving for Oakland tomorrow and am going to leave the Kreen in for the 1600 mile round trip. Will do an oil change and then another compression test when I get back.
Also will be doing a valve adjustment, check the timing chain, and do a leak-back test at that time.
Try out some Kreen! It was $14 plus $7.65 s/h for a quart, but came with a free can of Kroil, an aerosol penetrating lubricant that supposedly can't be beat.
I plan on ordering some more and trying it out on some other diesels. I'd love to hear some feedback from other folks who try it out in their diesel.