Redline SI-1 (too)

[Brad_C]

I know there is already a thread going on this stuff, but this is a bit of a different take.

I have an old 82 Volvo here. It has about 500,000k on the clock and has never had any major work done. I decided to give it a birthday, so I checked the injectors and found them filthy and certainly not spraying properly.

This car has a Bosch K-Jet system, and nobody in their right mind cleans these injectors. They just replace them.

I dropped mine in a beaker with a 50/50 Xylene/Acetone mix. I *thought* this would rapidly dissolve the years of PCV gunk and fuel system deposits. It certainly made it easier to rub off, but did not really do any active cleaning.

Just for giggles I dropped 30ml of Redline SI-1 in there (literally as a random, hey I wonder what this will do) before I packed it in for the day. The existing mix totalled 250ml.

Within 30 seconds the fuel system deposits literally started to drop off the injectors. No agitation or other mechanical input required.

If I had been actually trying to test this I'd have thought to photograph it, but I was not that clever.

I can not believe how fast this stuff started to loosen the gunk deposits.

Nope, photographing anything in a round glass beaker with a camera phone is just not going to work.

 

[Turk]

Good goin' on the experimenting, Brad_C!

PEA (THE active ingredient) works wonders on cleaning.

Keep it up - that's where we all learn!

 

[Garak]

Great info!

 

[Astro14]

Aw man! I just ordered a set of injectors for the MB...I should have ordered a can of Redline instead...

 

[GMorg]

Thanks for sharing. I am old enough to accept your word without a digital image.

Now I am wondering if the solvent pretreatment was required. It seems that a similar attempt was shared here without the pretreatment and perhaps a different brand of PEA. I don't recall the results as being as impressive. However, my memory may not be correct.

 

[GMorg]

Here is the link that was thinking about:

http://www.bobistheoilguy.com/forums/ubb...rue#Post1798430

 

[Brad_C]

Originally Posted By: Astro14
Aw man! I just ordered a set of injectors for the MB...I should have ordered a can of Redline instead...


I had to build a tool to hold the pintle open while I reverse flush them. I make no guarantees that I won't have to buy new ones, but cleaning and flushing them is something I've always wanted to try. Personally I suspect the pintle and seats will have worn and the spray pattern is going to be less than optimal, but at $179 a set plus shipping I figured I'd have a serious go at servicing these first.

On the upside, I have 8 Bosch electric injectors that need servicing also, so when I do those I'll do them one at a time with controlled chemical combinations and photographs. They are almost as gummed up as the k jet units.

 

[Brad_C]

Originally Posted By: GMorg
Here is the link that was thinking about:

http://www.bobistheoilguy.com/forums/ubb...rue#Post1798430


The difference with k-jet is these injectors are almost like diesel units. No solenoid, just a tube with a filter in it, a spring and a seat & pintle. You can forward flush them with a jig and compressed air, but reverse flushing them requires a very fine tool to pull the pintle out and lock it in place. Because the filter is internal you can't clean it any other way than reverse flushing.

I can't figure out how to push fluid through them with the pintle locked open, so I'm going to try sucking it through with a refrigeration vacuum pump.

Just waiting for the jbweld to set on my adaptor jigs. Jbweld is the best thing ever. I wish we'd had it as long as you guys have.

 

[Vikas]

I have done similar tests with 100% Techron on spark plug and nothing happened to the black carbon on the spark plug even after leaving it in the solution for week.

 

[Brad_C]

Originally Posted By: Vikas
I have done similar tests with 100% Techron on spark plug and nothing happened to the black carbon on the spark plug even after leaving it in the solution for week.


This stuff is grunge that builds up before it burns ( lacquer, gum and that sort of stuff ). It's not carbon, although solvent for carbon like that found on plugs and exhaust valves would be a great investigation.

 

[Brad_C]

Follow up :

I'm happy to report that operation "Completely destroy the remaining spray pattern of 4 K-Jet Injectors" was a complete success.

My clever little pintle retaining tool appears to have scored the seating surface of the pintle guaranteeing they will never seat or seal properly again.

Now, on the useful results side of the experiment :

The Injectors sat in the aforementioned mixture since I put them in there, with no agitation or other movement. When I examined the beaker this afternoon it looked like a considerable qty of dirt and gum remained on the injectors, however when I pulled them out of the fluid all the dirt slid off and remained behind.

That SI-1 is some powerful cleaner.