shaking like a paint mixer

[fireman1073]

After trying all the usual suspects (rack dampner bolt, filters, injectors, etc) car still occasionally shook at idle.

I thought it was the veg oil.

Finally figured it out.

When fuel is hot it shakes.

I shut my heat exchanger off with the ball valve and perfect idle.

I have one for my veggy oil conversion.

Other than that no problems on veg oil in over 13,000 miles.

Why would 180 degree (checked with infrared gun) fuel cause shaking?

I tried running straight diesel in my veg oil tank to diagnose and discovered the heat was making the shake no other thing.

heat on=shake heat off=smooth, that simple!

oh! 1984 300sd two tank conversion coolant heated only.

does the heat cause expansion in the delivery valves, pump or injectors and cause sticking?

My other conversion 83 300d had no such problem, in fact it ran considerably smoother on oil.

Steve