I just slapped a new one on my 0-ring sizing chart. It is between a 127 and a 128. I would buy one of each in viton and see which one fits best. I don't have the metric charts.

I'm sure there are better places but here is one:
http://www.sisweb.com/vacuum/o-rings/viton_1.htm

About a 1-7/16 id and 3/32 thickness for the 127
1-1/2 inch id and 3/32 inch thickness for the 128
They are about $1.50 each.

From www.mcmaster.com
Part Number: 9464K92 $8.03 per Pack of 25
AS568A Dash Number 127
Type O-Ring
Cross Section Shape Round
Width 3/32"
Actual Width .103"
Inside Diameter 1-7/16"
Actual Inside Diameter 1.424"
Outside Diameter 1-5/8"
Actual Outside Diameter 1.630"

Material Viton
Viton Type Standard
Durometer Hard
Durometer Shore A: 75
Temperature Range -15° to +400°F
Color Black
Specifications Met Society of Automotive Engineers (SAE)

The Dash 128's are
Part Number: 9464K93 $8.57 per Pack of 25

A pack of each and you would have more o-rings than you would know what to do with!

-Jim
Oh, and it sounds like you have the process for biodiesel down pat! (I use 3.5g/L base + 1 per point of titration, then convert to KOH. I dry wash with magnesol so I try to minimize soap production.)
www.fryerpower.com

__________________
1995 S350D, Green with black leather interior.
Bought January 2008 w/ 233,xxx miles.
I did 22,000 miles during the first year of ownership.

I went ahead an bit the bullet on the o-rings. I bought a 25 pack of each. I'll have them up on my website, www.fryerpower.com, next week.
I also bought a 10 pack of 36mm ID 3mm thickness viton o-rings. Maybe they are the right size.
-Jim

__________________
1995 S350D, Green with black leather interior.
Bought January 2008 w/ 233,xxx miles.
I did 22,000 miles during the first year of ownership.

hope you're using a 2 micron (absolute) filter for that magnesol, it is a super abrasive

__________________
Bill

'82 300SD 195K
'84 300SD 199K

I use the 1 micron absolute filter I sell on my site as the final filter.

-Jim

__________________
1995 S350D, Green with black leather interior.
Bought January 2008 w/ 233,xxx miles.
I did 22,000 miles during the first year of ownership.

While i doubt BD quality is the issue, do you do the 3/27 test after processing? Take 3ml dried bio, mix with 27ml methanol. It should completely dissolve almost instantly, and leave a perfectly clear fluid (maybe slightly colored, but clear.) If any beads of oil settle out within the next hour or so, you haven't quite processed all the WVO. Like I said, this really shouldn't be your problem; any unreacted BD should just burn like WVO; but its always nice to check.

__________________
Paul
2004 E500 4matic; 72,000mi

Like I said in the earlier post, the only power loss I had was due to the 220,000 miles worth of junk from the dino diesel that built up in my tank coming loose and clogging the filters. That has nothing to do with the ability of biodiesel to burn and make power. It simply means that if the filters/screens are clogged you can't get fuel to the engine. If you can't get fuel to the engine you "loose power."

That said, I started putting Startron Tank cleaner in a couple of months ago and have not had to change a filter since then. Either it worked or I started adding it when the tank just happened to finally get clean.

-Jim

__________________
1995 S350D, Green with black leather interior.
Bought January 2008 w/ 233,xxx miles.
I did 22,000 miles during the first year of ownership.

I have an 87 300SDL that I was running commercial B100 in for a few tanks and the performance continually got worse, even after changing filters. I get mine out at the beach and brought 5 gallon cans back to fill up between beach visits. Long story short, I ran out of BD and had to fill the tank with Dino Diesel and noticed a remarkable improvement in performance. I am able to run B20 without any ill effects on performance. I could run my 82 300SD with B100 no problem. I'll be interested in hearing what happens.

__________________
1987 300SDL 265,000 mi.
1982 300SD 325,000 mi. (and holding)
1956 Packard Clipper 150,000 mi.