Friday, November 16, 2007

Toyota Diesel Injection Pump Failure

Goodbye injection pump. That's a hell of a way to end a day of surfing, but after some troubleshooting and another tow to the mechanic, we've discovered that my breakdown resulted from injection pump (IP) failure.

This is an excellent opportunity for anti-SVO critics to rail against veg. oil conversions. But I firmly believe the conversion is at fault, which once again amounts to operator error. Greasecar kits do not have a temperature gauge, which makes it impossible to maintain optimum fuel temps. What most people don't understand (and I'm not sure how you would know this without using a system with a temp gauge) is that SVO temp fluctuates wildly during normal operating conditions.

For example, draft a semi and your SVO temp will increase 20 degrees F. Pass that same semi and you'll see the temperature gauge plummet. It all has to do with the amount of air flowing across the engine and SVO lines. Temps can also change dramatically at the bottom of hills (inversions), and obviously fluctuate based on cruising speed.

So how the hell do you know if your Greasecar kit is up to temp?
You don't.

I'd planned on testing the system by installing a digital temperature gauge right before the injection pump, and I may still do that. But I'm not sure I want to put it through any unneeded stress after the $500-$800 rebuild.

In any case, here are some forum topics about Toyota 2LT injection pumps:

1985-1987 Toyota diesel Trucks - Injection Pump Forum Topics:
Nissan diesel forum: Nissan SD22 or Toyota 2L?
1987 Toyota TurboDiesel 2LT Injection Pump Failure
Toyota Diesel Forums - needing a new lift pump

Specifications: the pump is a rotary, Denso model 096000-3210.