mortskeg
18-02-2005, 02:46 PM
<center>http://img.photobucket.com/albums/v400/glen_ekstrom/injpump.jpg</center>
Until recently I have had a pretty good idea about the different mechanical processes of my diesel engine with the exception of one very important component- the injection pump. I knew that it was responsible for sucking fuel all the way from my tank to the engine compartment, and then delivering a high-pressure shot of fuel to each cylendar at the appropriate time, but the exact inner-workings remained a mystery to me. However, in repsonse to Glen's 81 engine trouble, Dr. Cool was so kind to post this awesome link- an online vw Diesel engine manual. (http://www.fostertruck.com/Files/VW_diesel_77-83.pdf)
The manual does a great job of getting into the simple theory behind the engine and dives deep into the injection pump with illustrations I've never seen in any bentley. However, my question goes beyond what I've been able to get out of this publication or the rest of the web- and may be answered by someone who has had the nutz to tear into a bosch injection pump for whatever reason.
I have been thinking a little bit about building an "appleseed" biodiesel reactor in order to keep my chemestry knowledge up to par (can't be outdone by all the meth-heads now can I?). I have read conflicting reports about what all you need to change on the fuel system, but if I go forward with the biodiesel, would like to change all the small rubber fuel hose that goes from the tank to the steel lines, and then from the steel lines to the filter/ pump return to a compatable material (viton). But since my injection pump seems to work pretty well I don't have much interest in taking it in to be rebuilt, and was trying to figure out where all the "incompatable" seals are at inside the pump.
In looking over the manual, I couldn't really tell where rubber seals would be used inside the pump as it all looks like closely machined parts. I see the low-pressure side utilizes a rotary vane pump, but I was guessing that the vanes were just chunks of metal that float in the channels in the rotor.
Anyhow, if any of you have any idea where any seals are inside the pump, or what detriment would be caused to the pump by using properly prepared biodiesel, please let me know. Also I have on my list of future things that I could do to the pickup "if I were a rich man" a NA 1.9d engine swap. I was wondering if the 1.9 pump that came with these new engines had "compatable" seals already. This might be a good question for the dark lord of the sith, since he just had his 1.6td pump rebuilt.
So that is my question. Where are these mystery seals/orings/gaskets or whatever. I don't put alot of miles on my pickup like I used to but I thought that it might be fun to try and make my own fuel and "stick it to the man". Plus I'm down with the environment and lowering emissions- but at 3.45/ gal- commercial biodiesel can take a long walk- IMHO.[:p] Ha ha.
Until recently I have had a pretty good idea about the different mechanical processes of my diesel engine with the exception of one very important component- the injection pump. I knew that it was responsible for sucking fuel all the way from my tank to the engine compartment, and then delivering a high-pressure shot of fuel to each cylendar at the appropriate time, but the exact inner-workings remained a mystery to me. However, in repsonse to Glen's 81 engine trouble, Dr. Cool was so kind to post this awesome link- an online vw Diesel engine manual. (http://www.fostertruck.com/Files/VW_diesel_77-83.pdf)
The manual does a great job of getting into the simple theory behind the engine and dives deep into the injection pump with illustrations I've never seen in any bentley. However, my question goes beyond what I've been able to get out of this publication or the rest of the web- and may be answered by someone who has had the nutz to tear into a bosch injection pump for whatever reason.
I have been thinking a little bit about building an "appleseed" biodiesel reactor in order to keep my chemestry knowledge up to par (can't be outdone by all the meth-heads now can I?). I have read conflicting reports about what all you need to change on the fuel system, but if I go forward with the biodiesel, would like to change all the small rubber fuel hose that goes from the tank to the steel lines, and then from the steel lines to the filter/ pump return to a compatable material (viton). But since my injection pump seems to work pretty well I don't have much interest in taking it in to be rebuilt, and was trying to figure out where all the "incompatable" seals are at inside the pump.
In looking over the manual, I couldn't really tell where rubber seals would be used inside the pump as it all looks like closely machined parts. I see the low-pressure side utilizes a rotary vane pump, but I was guessing that the vanes were just chunks of metal that float in the channels in the rotor.
Anyhow, if any of you have any idea where any seals are inside the pump, or what detriment would be caused to the pump by using properly prepared biodiesel, please let me know. Also I have on my list of future things that I could do to the pickup "if I were a rich man" a NA 1.9d engine swap. I was wondering if the 1.9 pump that came with these new engines had "compatable" seals already. This might be a good question for the dark lord of the sith, since he just had his 1.6td pump rebuilt.
So that is my question. Where are these mystery seals/orings/gaskets or whatever. I don't put alot of miles on my pickup like I used to but I thought that it might be fun to try and make my own fuel and "stick it to the man". Plus I'm down with the environment and lowering emissions- but at 3.45/ gal- commercial biodiesel can take a long walk- IMHO.[:p] Ha ha.