Is 602 fuel heater theromstatically controlled? - PeachParts Mercedes-Benz Forum

biopete · #1 04-15-2010, 05:36 PM

Is 602 fuel heater theromstatically controlled or is it always heating the fuel a little? On one of my cars they bypassed it on the fuel circuit. i hear they can leak fuel. If its on all the time, i'll want to reengage it to give extra heat for my vegetable oil. But if not, i'm going to ignore it, maybe even take it off and put my new flat plate heater there.

thanks

biopete · #2 04-16-2010, 02:42 AM

Alright. I'm taking one off and taking it apart and posting pics. First though, i think i'll feel the coolant hoses and fuel hoses and see if the get cooler when the collant gets hot.

I'm thinking it heats all the time. The thing is not big enough to overheat the diesel and lessen its viscosity too much.

jt20 · #3 04-16-2010, 02:56 AM

the part on the block you are about to take off is, indeed, a thermostat.

under the original design, the heater does not always heat fuel; leaks may change this.

compress ignite · #4 04-16-2010, 02:59 AM

it explains @ what temperature the Fuel is routed to the "Warming" section
of the "Fuel Thermostat"

http://www.ps2cho.net/downloads/MB%20CD/W124/Index/602_603index.html

layback40 · #5 04-16-2010, 03:05 AM

Pete,
Forget that heater.
If you must play with WVO, you should get a proper heat exchanger and heaters for your injector hard lines.
The best you could do is to turn the WVO into bio-diesel, its not that hard ~ child's play really.

http://www.goshen.edu/chemistry/Home/biodiesel/The_GC_Biodiesel_Processor

That way you are not likely to be on here asking questions about stuck rings & bad injectors in a couple of months.

biopete · #6 04-16-2010, 10:37 PM

Ahh, thanks yall. I won't worry about that silly little heater then. I was just thinking if that thing was hot all the time it would not hurt to have its extra heat along with my flat plate heater. I have an Elsbett wvo system I'm putting on. Looks like i can just plug the heater right in to where the stock one is.

LayBack, don't worry. I'm a greaser through and through. No biodiesel making for me. I won't be posting back here with stuck rings and bad injectors. Never even heard of a benz getting stuck rings from wvo. But i will be posting with updates on how many miles i have on my 602 and 603 on wvo with single tank elsbett systems. I have new monark injectors , glow plugs, after glow relays and a good flat plate heat exchanger. I've run wvo for years in benzs and even TDIs and never any trouble. But Benzs are the best.

When i get 30,000 miles without any ill effects -- as demonstarted by before and after compression tests will you believe it can be done?

layback40 · #7 04-16-2010, 10:50 PM

Elsbett you say!!

Best you have a read of

http://www.ncat.org/special/oilseeds_innovations4.php

We dont want you totally with your head in the sand.
Good Luck !!!!! You will need it

dablk1 · #8 04-22-2010, 05:15 AM

Perfect timiing on this post. I beleive that my fuel heater is leaking. Is this the part right above the driver side motor mount and below the IP with the fuel injection line entering the back and the inline fuel filter line entering the front? It's leaking like crazy. Is it an R+R or can I simply replace a washer' seal or something like that?

biopete · #9 04-22-2010, 02:47 PM

Quote:

Originally Posted by layback40

Elsbett you say!!

Best you have a read of

http://www.ncat.org/special/oilseeds_innovations4.php

We dont want you totally with your head in the sand.
Good Luck !!!!! You will need it

Thanks for link. I couldn't find the results of engine tear down. That study concluded nothing other than some glow plugs burnt out and combustion was not as good as diesel and you get less horse power. Well no *****. You realize that the first tank of WVO. But after 20,000 miles you also realize its not killing your engine if you do it right. I ran a 617 on single tank vegetable oil , blending with diesel at times and other times not for about 20,000 miles. Compression was the same as before i started. Car is sold now and current owners are running veg.

What we need to do is define the success metric for a single tank wvo system then we can get on to the business achieving that. There is some level of wvo use that can obviously be successful in a single tank system. It may be 50% wvo or 75% or 25% or 100%. For me success would be 100,000 miles running 75% wvo on average without destroying the engine. Would you all agree that would be a pretty successful wvo experiment?

I believe you can run a single tank system successfully. The trick is using your glow plugs a lot and keeping an eye on them and also keeping good injectors -- both of which if replaced every year would still be only be about 250.00 max doing the labor your self. When starting cold, i afterglow for about 5 minutes. I have a switch to flip my plugs off and on and trick them into a new cycle cause they think the car was turned off and was restarted. Ideally I 'd like to have warning lights for each glow plug to let me know as soon as they are burned out. And each 25,000 miles pull and pop test injectors.

It would be beneficial to blend 5% to 10% diesel or Kerosene all the time and i may do that. In winter you have to blend more and sometimes i just go straight diesel or biodiesel and consider it an opportunity to flush the system. That may go a long way to preventing problems.

I'll document my experiment here in its own thread. Compression tests , pop tests, glow plug tests ever 25,000 miles. My problem though is i have two W124s -- wagon and sedan-- and its gonna be tough to drive only one of them. I wish i could just have one car but i like em both for different reasons. So i'll convert one this month , probably the wagon first, drive it a year -- we can see the results. It will be fun.