Thread: fuel pump issues... remote assistance?

Originally Posted by grnrvrs

Dougal,
Something like this?

Exactly that, thank you.
70 cc/1000 strokes at full power.

So at max power, 3000rpm, that 4BD1T is consuming 229 g/kwh of diesel. That's a fantastic figure which represents 35% efficiency. Slightly better than the VW Tdi's do at full power.
A Cummins 4BT is about 10% worse.

Pic shows page from manual IDE2140 for calibration of 4BD1T.

I don't have a pic of the page for the 4BD1 but have noted some pertinent injection volumes at different adjusting points below.

Adjusting Point - 4BD1T - 4BD1
A - @ 900rpm 70.2 to 72.2 cc/1000 st. - @ 950rpm 67.8 to 69.8 cc/1000 st.
B - @ 550rpm 49.7 cc/1000 st. - @ 650rpm 48.7 to 51.9 cc/1000 st.
D - @ 1500rpm 78.0 cc/1000 st. - @ 1600rpm 67.0 to 70.2 cc/1000st.

These speeds are pump speed (1/2 engine speed.

Adjusting point A is close to corresponding with maximum torque.
Adjusting point D is close to corresponding with maximum power.

Comparing injection volumes cc/1000 strokes (but ignoring pump speed):
At 'A' 4BD1T inj. vol. is about 3.4 to 3.5% greater than 4BD1.
At 'D' 4BD1T inj. vol. is about 11.1 to 16.4% greater than 4BD1.

My injection pump with stock 9.5mm plungers was put on a test bench and delivered 180 cc/1000 strokes with the rack held at full travel. It could deliver 170 cc/1000 strokes with the governor on, and probably get up to 180 cc/1000 if the profile of the torque cam is modified.

It was waiting for 10.5mm elements from Japan, but I had a email when I got home yesterday, that a pump with 10mm plungers was in for service, and it was found that those elements would not fit in my housing. So most likely I will have the pump maxed with the stock plungers for now. If it turns out to not be enough fuel (unlikely for what I want), then I will change the pump.

Originally Posted by Bush65

Pic shows page from manual IDE2140 for calibration of 4BD1T.

I don't have a pic of the page for the 4BD1 but have noted some pertinent injection volumes at different adjusting points below.

Adjusting Point - 4BD1T - 4BD1
A - @ 900rpm 70.2 to 72.2 cc/1000 st. - @ 950rpm 67.8 to 69.8 cc/1000 st.
B - @ 550rpm 49.7 cc/1000 st. - @ 650rpm 48.7 to 51.9 cc/1000 st.
D - @ 1500rpm 78.0 cc/1000 st. - @ 1600rpm 67.0 to 70.2 cc/1000st.

Shame about the pump elements. You'll just have to be content with the ~200kw possible from the ones you have.

Did the manual list rated power or torque for those adjustment points? Given the 4BD1T and 4BD1's were available in different ratings for different applications.

Originally Posted by Dougal

Shame about the pump elements. You'll just have to be content with the ~200kw possible from the ones you have.

Did the manual list rated power or torque for those adjustment points? Given the 4BD1T and 4BD1's were available in different ratings for different applications.

I didn't word the last part of that post very well. My guess is also about 200kW, which in reality will be ok for what I want to do with the rangie.

The manual doesn't list power or torque values anywhere. Also no printing date and only states on the cover:

Diesel Engine
4BD1, 4BD1-T Models
(for automotive use)
1986 ~

Later years may be different.

On my engine I found a 1989 date, along with some Japanese characters, permanently marked on the cylinder head (underneath a rocker shaft pedestal, when I was replacing head bolts).

to keep you all updated, the pump is coming off tomorrow and will go to a specialist for a look-see. should be back on the road by the time I touch down on Wednesday evening (hopefully!)

will update with a followup on what the problem really was later on...

Thanks Echidna - would be interested to know what the problem is.

If anyone cares, my 4BD1(+T), original fitment to a 1987 110 county, has 9.5 mm plungers.

Originally Posted by isuzurover

Thanks Echidna - would be interested to know what the problem is.

If anyone cares, my 4BD1(+T), original fitment to a 1987 110 county, has 9.5 mm plungers.

My Factory 1990 110 Isuzu County has 9.5mm plungers as well.

Jon

ok well I'm in Melbourne and the pump is undergoing a rebuild

all plungers are worn/scored and rusty due to contaminated fuel, governor weight bearings have lots of play and all the seals are cactus... total cost for a complete rebuild = $1800 + GST ...ouch... and I've got to drop the fuel tanks and clean em out plus the fuel lines.... any thoughts on removal of the fuel lines? or can this be done in situ? I was thinking of using something like compressed air to blow em out then some solvent like paint thinners to clean the lines ?? too volatile? petrol maybe? whatcha reckon brains trust?? not really how i envisaged spending a proportion of my holiday, but anyway that's life!