
Originally Posted by
duskylim
Dear Sirs:
The white smoke you are experiencing has usually 2 causes:
1) Long cranking times without firing cause the injectors to deliver a lot of fuel into the combustion chamber and then, when the engine does finally start and fire, not all the accumulated fuel is burned up, the unburnt liquid fuel is expelled as an acrid (masakit sa mata at ilong) white smoke. Its smells terrible and is irritating to the eyes and lungs.
2) If the smoke is continuous and the engine runs unusually slowly, with very little power, its possible that the cam has jumped a tooth on the belt, retarding the timing, which would result in the observed problem.
Of course be sure that it is not OIL smoke which means you need to have an overhaul na. Get a professional opinion. Also do yourself a favor and use better quality fuels, I recommend Shell, Petron, Total and City Oil in that order of preference.
The best solution is to make sure that your engine and in particular your fuel and glow plug systems are working properly. The best check for the fuel system is to go to a competent calibrator (e.g. DRT along Shorthorn - look for Gener del Rosario, or even the ultimate local calibrator - Jake Arellano at Central Diesel Clinic along Quezon Blvd just at the foot of the road to Capitol Medical Center). They are very helpful and will explain to you everything.
One thing people don't often do with the Mazda B2200/B2500 is to check the fuel separators, filters and thimble filter.
The water separator is just beside the fuel tank in the back and can get badly clogged if neglected - I should know because I was guilty of that myself. If you buy cheap water-contaminated diesel (guilty again) mabilis sya magbara. Don't bother trying to clean it out yourself, bukod sa napakahirap, its a 2 -3 person job. Just bring it to DRT and ask Gener to do it for you.
I know it seems expensive, but replacing the fuel filter regularly is essential to proper running, despite the fact that the manual says it should be changed every 10, 000 km - masakit sa bulsa! Well what I did was to get the one for a Hyundai Starex, and replace the original filter assembly of the Mazda, WHY?
1) the entire Starex filter assy is cheaper than the Mazda's.
2) the Starex filter has a hand pump na wala sa Mazda, so you can pump/prime it kapag naubusan ka ng crudo, with the original filter you had to crank it for a very long time to get fuel in, kawawa batterya mo!
3) the replacement Starex filters are cheaper and have a drain and sensor at the bottom for water and sediment... panalo.
Most people aren't aware that the injection pump has a last line of defence against dirt and sediment, its a tiny, thimble-sized filter at the base of the fuel inlet into the injection pump.
It has a nasty habit of getting clogged up reguarly so you should clean it out every 6 months or so. If it gets blocked your engine gets dramatically weaker - no power, walang hila, etc.
Bring it to DRT and have them clean it out for you, watch carefully and after seeing it done once, you can do it for yourself na.
If its not the fuel system, hard starting is a sign of DEAD glow plugs. Sadly they do not die all at once but one at a time. If you lose one or two, you might not even notice it, parang humahaba lang ang starting mo.
When you lose all 4 then it becomes extremely difficult if not impossible to start. You have to keep cranking forever kaya, and maraming diesel na naiipon sa makina, which becomes the white smoke you see kapag umandar na sya.
All that unburned diesel is BAD for your engine, it washes away the oil from the cylinder walls and shortens the engine's life, so you better fix it.
Again try out the KHT - Kitahara glow plugs - they have a reasonable price, good performance and reasonable life. Now the original NGK's will cost you about Php 1250-1500 each!
A Kitahara plug in the same range (go for 11.5 v to 12 v) is from Php 275-350 each - kitaamm! Admitedly they won't last as long as the original NGKs - mine lasted about 6 to 7 years, while the Kitahara's last only about 2 to 3 years.
But because they're 1/4th the price of the originals, panalo ka pa rin (it comes to half the effective cost).
Its quite likely you have to change glow plugs na so punta ka na ng Fordland sa Banawe at magdala ka ng sample ng glowplug mo - I think its a PZ-30 (11.5v to 12 volts).
Hope this helps,
Best Regards,
Dusky Lim