Monday, August 28, 2006

More Pump Timing and Fuel Economy

Upon recommendation from a reputable source, I'm going to try timing SoDak at 0.95mm and let y'all know what I think. This is quite a bit higher that the 0.75mm spec and just a bit higher than the 0.92mm spec'd for non-US cars. the car's a bit lethargic at 0.75mm, in my humble opinion.

My friend bought the universal cam holding tool mentioned below. I timed the injection by rotating the cam sprocket and not moving the pump (a HUGE pain in the buttocks). First check your timing as described earlier in this BLOG. Next roll the engine over again to TDC, back it up until you get your lowest dial reading (should be zero from checking the timing). Then you loosen the rear cam sprocket, effectively disengaging the cam from the pump. If you want to add timing, say 0.2mm in my case, you roll the pump forward 0.2mm holding the cam sprocket (or use the cam holding tool). The camshaft will not move, only the sprocket. The rear sprocket has no woodruff key so it is free to rotate. Then you retighten the cam sprocket and recheck the timing. It's that simple. You need to make sure you don't turn the injection pump while you tighten the cam sprocket bolt, but you can just look at the dial indicator to make sure. Worked like a charm!

FYI the EPA fuel economy specs for the 1985 740TD w/auto are 25 city, 30 hwy. I get 30 hwy/city. It should improve with the 0.95mm setting.

4 Comments:

Anonymous Search engine optimization said...

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11:14 PM  
Anonymous ThickasaBrick said...

The mark on my pump base indicates the pump has already been rotated in a counter-clockwise direction as viewed from the front of the car. This means my pump timing already been advanced, right?

4:08 AM  
Blogger mycoleptodiscus said...

Not necessarily. As mentioned, the rear cam sprocket has no woodruff key so it is not "indexed" to the pump. All the pump rotation tells you is that someone adjusted the timing at some point. You need to actually measure the timing using the dial gauge.

8:44 AM  
Anonymous ThickasaBrick said...

"First check your timing as described earlier in this BLOG." Could you please link me to that posting? I'm still not good at finding stuff on the net. Thanks.

4:22 PM  

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