3B Injection Pump Install Tips (1 Viewer)

[LevinBR]

Looking for tips before I install my rebuilt rotary injection pump on my 3BII

1) Bleeding the system - any techniques? 3B manual just says to loosen the nuts on injection lines to nozzle and crank engine...

2) Regarding timing, I've got my dial gauge ready along with specs for travel at TDC. Any extra tips?

2) Should I lubricate / grease the pump's spline shaft?

Thanks!!

 

[OGBeno]

Looking for tips before I install my rebuilt rotary injection pump on my 3BII

1) Bleeding the system - any techniques? 3B manual just says to loosen the nuts on injection lines to nozzle and crank engine...

2) Regarding timing, I've got my dial gauge ready along with specs for travel at TDC. Any extra tips?

2) Should I lubricate / grease the pump's spline shaft?

Thanks!!

Rotary or inline pump?

 

[LevinBR]

Rotary or inline pump?

Rotary.

 

[OGBeno]

Rotary.

Cool. Same as mine. Basically a Bosch VE4 Pump.

1. That’s about it.

2. It’s tight in there if doing in engine.



3. I did to installed the keyed location easier. Not necessary though.

Make sure to watch this from Denco in Oz:

 

[LevinBR]

Hey mudders, bumping this thread because I'm having some trouble with my newly rebuilt injection pump (rotary style, '89 3BII).

Instal steps included dial gauge timing and bleeding the system of air. The truck seemed to idle ok, no smoke and I could give it some revs without trouble. Once I was on the road and the engine was under load, power would die out, engine would hesitate, and I would see puffs of thin white smoke when the motor stuttered the most. It is pretty intermittent, but when giving it throttle to accelerate, the truck would almost always stutter hard, sometimes coming close to stalling.

My gut wants to say it still isn't getting enough fuel. This is probably because the shop that rebuilt the pump substituted a 1/4 inch banjo fitting at fuel inlet since the original 5/16 tube had broken off.

Really stumped here, hoping the forum can help me find some clues / resolve. Thanks!

 

[roscoFJ73]

Unlikely, because the pump sends most of the fuel back to the tank. Have you tried turning the fuel up? But you should be dumping it in the hands of the rebuilder or asking for a refund. DENSO pump parts are metric so I dont know about a 5/16 fitting . The correct banjo would be a dime a dozen online.

This is probably because the shop that rebuilt the pump substituted a 1/4 inch banjo fitting at fuel inlet since the original 5/16 tube had broken off.

 

[LevinBR]

After continued research, I have a feeling that the timing of my pump may be retarded - causing incomplete combustion, white smoke, and misfires above idle.

This thread helped 3B diesel engine misfires above idle

I timed it to Toyota spec ( 1.27 - 1.33 mm plunger stroke), but I have little confidence in my $50 amazon dial gauge.

I am hesitant to increase fuel, as it seems like the engine is struggling to completely burn the fuel it has.. More fuel with retarded timing could be a bad direction to go.

Also, I am less worried about the 1/4 inch inlet fitting... As @roscoFJ73 mentioned, the pump sucks in more than it needs.

Happy to hear more tips/ideas if you have them! Thanks.

 

[OTBT]

There are two hoses that come down from the intake manifold venturi to the automatic governor (vacuum advance) at the rear of your injection pump. Make sure there are no crimps or blockages in these hoses, and try crossing them. Should that not work, I would bet that the diaphragm has a pinhole in it. Diaphragms are cheap and easily replaced at any injection shop - but if you try to do it yourself be careful of all the little ballbearings that will like come tumbling out. Make sure the vacuum lines and work area is spotless - as this is really susceptible to even tiny amounts of dirt.

 

[LevinBR]

There are two hoses that come down from the intake manifold venturi to the automatic governor (vacuum advance) at the rear of your injection pump. Make sure there are no crimps or blockages in these hoses, and try crossing them. Should that not work, I would bet that the diaphragm has a pinhole in it. Diaphragms are cheap and easily replaced at any injection shop - but if you try to do it yourself be careful of all the little ballbearings that will like come tumbling out. Make sure the vacuum lines and work area is spotless - as this is really susceptible to even tiny amounts of dirt.

Thank you for the advice but I have looked and I do not see those hoses.. I have a rotary style VE pump, here is a diagram;

Also, as an update, timing adjustments did not fix the issue. In addition to advancing the timing, I also increased the fuel "smoke" screw. Even with fuel increased and timing advanced, I couldn't get any black smoke - only white puffs and a stuttering engine. Taking the whole truck to the diesel shop ASAP, none of this was happening with the cruiser pre-rebuild.

 

[OTBT]

Oops, somehow I thought you had a Nippon-Denso pump. Just shows what I know

 

[LevinBR]

Mystery solved.

I had the truck towed back to the shop who rebuilt the pump and they found that the banjo fitting (at fuel inlet, described earlier) had been installed incorrectly. This caused an extreme restriction to fuel flow.

I had turned in the max fuel screw in my troubleshooting attempts, so now it is blowing black smoke over 3/4 throttle . Need to back it off a turn or so, then the truck should be back and better than ever.

It's funny how specialists forget the simplest things during complex, highly technical procedures. My transfer case was rebuilt, and the mechanic forgot to tighten the fill plug... Injection pump completely rebuilt, and fuel inlet banjo bolt was put in wrong.. At least these are simple fixes!