Diesel Fuel Injection System Help Desk

[rmpmla]

thank you sa info. I'm not sure if may solenoid valve ba ang 4d56.

meron siya. yung #3 po ang solenoid valve sa above pic

[Dieseldude]

Di po ako nakapagrebore ng cylinders sir, kasi need ko ibaba yung engine pag ganun. Do I need to rebore my cylinder liners sir?

I did check and replace my air filter sir. The smoke levels dont change if i put my airfilter and blowby hose in the engine system cycle and still the same result of black smoke without those in place.

Black smoke could be due to an injection pump problem.

[DonPempe]

Wag muna. Temporarily replace the black rubber hose between the fuel filter and the injection pump with a clear plastic hose. Tingnan mo kung sumisipsip ng air bubbles ang pump.

Sir Dieseldude

Update sa problem ng ride ko..Dinala ko sa calibration center to check yung injection pump ko.I mentioned mga na encounter ko na problems and sabi nila my problem sa rotary pump.. Nang ni chek Aun nga argh may tama nga nag ka roon ng mga gasgas ung pump or distributor (tama b sir ang term ko?) and besides nagkaroon ng oil na dapat diesel lang daw meron dun ( dumaan daw sa O-ring ung oil.)

After mapalitan ung parts and calibrate na rin nag ok na at nde na namamatay ung engine.

Ask ko Sir kung bat ganun ung accelerator pedal ko nanginginig once umabot na ako ng 2 rpm pero pag dini inan ko pa apak nawawala naman. Normal ba sir un ? dati nmn nde ko nmn nararamdaman un. Thanks in advance!

[Dieseldude]

Sir Dieseldude

Update sa problem ng ride ko..Dinala ko sa calibration center to check yung injection pump ko.I mentioned mga na encounter ko na problems and sabi nila my problem sa rotary pump.. Nang ni chek Aun nga argh may tama nga nag ka roon ng mga gasgas ung pump or distributor (tama b sir ang term ko?) and besides nagkaroon ng oil na dapat diesel lang daw meron dun ( dumaan daw sa O-ring ung oil.)

After mapalitan ung parts and calibrate na rin nag ok na at nde na namamatay ung engine.

Ask ko Sir kung bat ganun ung accelerator pedal ko nanginginig once umabot na ako ng 2 rpm pero pag dini inan ko pa apak nawawala naman. Normal ba sir un ? dati nmn nde ko nmn nararamdaman un. Thanks in advance!

Maraming pwedeng panggalingan ang nginig; engine supports, balancer shaft, atbp. Pero kung dating walang nginig sa 2k rpm, baka may problem sa calibration or sa pump installation. Meron naman siguro warranty yung calibration shop na gumawa sayo.

[chase]

hi,

i have a diesel daewoo forklift, it spews white smoke at idle and even more smoke when you rev it.
had the injection pump recalibrated and it seemed to lessen the smoke, but the is still a noticeable amount of smoke.
had 2 mechanics look at it and they say the engine is a goner, blow-by na.

but since its just smoke, and its just a forklift used in private property, no problems with law enforcement. so i just kept using it as it is, all smoky as hell.

but lately, it doesn't want to start, sometimes, when you're using it, it just stalls and doesn't want to re-start.

have ruled out overheating since i just installed a temp gauge and it was used extensively then whole day yesterday but it didn't stall.

my only 3 reasons for it exhibiting the problems are:
1. faulty starter
2. stalling/hard starting because of blowby??? <-- this one i'm not sure.
3. gremlins in the electrical system. <-- so very hard to diagnose. but had a relay recently replaced.

any ideas? thanks!

[alrorskyz]

Your problem seems to be air in the fuel system, or a faulty injection pump.

okey Sir thank u, if injector pump ang may problem ilan kaya ang magagastos ko dito at ano kaya ang papalitan na parts? taga province "leyte" kasi ako maghanap pa ako ng marunong magcalibrate nito.

[alrorskyz]

meron siya. yung #3 po ang solenoid valve sa above pic

diba sir para sa aircon lang yun solenoid. kung hindi pa naka turn-on ang aircon hindi pa magfunction yun solenoid. tama ba ako?

[rmpmla]

thank you sa info. I'm not sure if may solenoid valve ba ang 4d56.

diba sir para sa aircon lang yun solenoid. kung hindi pa naka turn-on ang aircon hindi pa magfunction yun solenoid. tama ba ako?

for cold start compensation, kailangan ng solenoid valve or mechanism para tumaas yung idle RPM. Hindi ako familiar sa injection pump ng 4D56 engine. pwede rin nag share yung aircon at cold start compensation ng solenoid valve during engine start. best way is to observe similar good running 4D56 engine and see how it behaves during cold start .

For WLT31 engine kasi eh separate ang solenoid valve ng cold start at aircon. At cold start eh kita ko na na-activate yung vacuum actuator para tumaas yung idle then after 2~3 minutes eh release na ito.

HTH

[Dieseldude]

hi,

i have a diesel daewoo forklift, it spews white smoke at idle and even more smoke when you rev it.
had the injection pump recalibrated and it seemed to lessen the smoke, but the is still a noticeable amount of smoke.
had 2 mechanics look at it and they say the engine is a goner, blow-by na.
Run the engine temporarily without the exhaust manifold to see if all cylinders are smoking white. It is possible that only one cylinder is smoking..

but since its just smoke, and its just a forklift used in private property, no problems with law enforcement. so i just kept using it as it is, all smoky as hell.

but lately, it doesn't want to start, sometimes, when you're using it, it just stalls and doesn't want to re-start.

have ruled out overheating since i just installed a temp gauge and it was used extensively then whole day yesterday but it didn't stall.

my only 3 reasons for it exhibiting the problems are:
1. faulty starter and/or relay, weak battery = no crank or low cranking rpm
2. stalling/hard starting because of blowby??? <-- this one i'm not sure. Do a compression test. Is the engine consuming oil?
3. gremlins in the electrical system. <-- so very hard to diagnose. but had a relay recently replaced. Starter relay? Also possible if the pump is rotary and has a fuel shut-off solenoid.

any ideas? thanks!

[Dieseldude]

okey Sir thank u, if injector pump ang may problem ilan kaya ang magagastos ko dito at ano kaya ang papalitan na parts? taga province "leyte" kasi ako maghanap pa ako ng marunong magcalibrate nito.

6 - 10K is the range of repair cost.