Blow-by engine after fully synthetic oil?

[PapaBravo]

Mga kapatid,

I have a serious problem that I hope you can help with. Kasi after buying a second hand Pajero (1995) I brought it to the casa for "heavy check-up." Before I bought it hindi pa siya 'blow-by'. Tapos after changing all filters (oil, air, etc) and changing oil from ordinary to fully synthetic (recommended by Mitsubishi) na pagkamahal-mahal, nag blow-by na siya. Bakit!

And to top it all, I asked the technician how is the engine before I left the casa and he said it is alright and no blow by. Pagdating ko sa bahay to look at the engine blow-by pala. How could they have missed it!

My question is could it be possible that the fully synthetic oil changed the performance of 4d56. Or is there such a thing as 'hiyang' on particular oils for diesels.

What could have happened in the casa that caused all these? May epekto ba ang linis lahat sa blow by?

Today I am going back to casa to have it reexamined - one week pa lang kasi ang nakaraan

Please advice this newbie.

Salamat ng marami and warm regards all around.

Papa Bravo

[Olive Drab]

may kakilala akong bumili ng old car
nung kinuha nila no blow-by, after a week blow-by na.
sabi ng mechanic, at the time na bibilhin nya pinuno ng OIL TREATMENT.

[Doc Diesel]

we have a compression tested at our shop.

Doc Diesel

[PapaBravo]

Salamat Olive Drab and Doc Diesel,

After searching the internet mukhang possible nga yung pinuno muna ng oil treatment. I saw sites of oil lubricants claiming to minimize or stop blow by thru their oil treatments, like Valvoline.

My next question is okay lang ba kung gagamitan ko ng oil treatment to stop the blow by. What's the downside to using them? Or should I go for more drastic measures such as overhauling na?

[FrankDrebin]

Ano ba yung blow-by?

Paano ba ito nararamdaman?

Sensya na ngayon-ngayon lang ako nag-diesel.

[pajerokid]

PapaBravo... i dont think the oil is the Culprit. Its possible na lumala lang talaga yung blowby ng makina.

I was victimized by similar circumstances... being a first time diesel user. Walang choice.... pina overhaul ko (twice in fact). But now im reaping the benefits of a good diesel engine! No regrets coz learning experience naman.

Frank::: Blowby is an engine condition where the engine oil "blows by" the piston rings and gets burned in the combustion chamber. Mapapansin mo to pag mabilis maubos ang langis mo... tipong 1 liter a week ang kailangan idagdag. Pansin ito sa gas engines, pag parang bluish-black yung usok, blowby na yon.

Sa diesel mas hindi halata kasi mausok talaga yung exhaust hehehe

[chieffy]

sir PapaBravo...imho, temporary lang na solusyon yung paglalagay ng oil treatment, nandun pa rin po yung cause ng problema nyo...go to a reputable machanical shop to get their opinion...most probably overhaul na po iyan...

hintay lang po kayo ng reply ng iba pa nating kasama

[OTEP]

Pano mo nasabing blowby?

[bogart]

Originally posted by PapaBravo
Mga kapatid,

I have a serious problem that I hope you can help with. Kasi after buying a second hand Pajero (1995) I brought it to the casa for "heavy check-up." Before I bought it hindi pa siya 'blow-by'. Tapos after changing all filters (oil, air, etc) and changing oil from ordinary to fully synthetic (recommended by Mitsubishi) na pagkamahal-mahal, nag blow-by na siya. Bakit!

And to top it all, I asked the technician how is the engine before I left the casa and he said it is alright and no blow by. Pagdating ko sa bahay to look at the engine blow-by pala. How could they have missed it!

That is the question! Anong klaseng technician ba yung tumingin? baka electrical technician at hindi engine mechanic? j/k lang ah!

Paano mo nga pala nasabing blow-by?

Sayang naman yung ginastos mo! Get back at the casa.

[Ungas]

Malakas ang exhaust na lumalabas sa engine oil cap area. Engine breather malakas ang tulo ng langis. Kung may usok normal ito kaya nga tinawag na breather.

[PapaBravo]

May maraming tilamsik na engine oil mula sa crankshaft (tama ba ang tawag dito?) at sa dipstick, at maraming usok na kulay puti. Ang ginawa ng mechanic - divert the breather hose palabas directly para hindi pumasok uli ang usok and some oil.

Just came from casa for more scientific testing - nagpa compression test na rin ako. P600 ang bayad. Dito na siguro magkaalaman kung ano ba talaga ang condition ng makina. Sabi uli ng Mitsubishi mechanic hindi daw blow by yon kahit malakas (para sa akin at sa isa pang mechanic sa labas).

Stay tuned, at ikukuwento ko sa inyo ang results bukas. Nagpa-estimate na rin ako ng overhaul just in case. Ang mahal pala!!! I hope its not really necessary.

[Ungas]

What I mean is, parang exhaust pipe yung engine oil cap area. Sorry for the confusion.

If my memory serves me right, iba-iba ang sukat ng piston sizes ng 4D56TDiC. At yung yari ng bakal iba rin compared to 4D56T pistons.

[Dieseler]

Guys,

I read somewhere that Synthetic Oils are more 'manipis' than Regular Oil. Tapos an older engine that's used to regular oil will run ok, but when you put Synths eh dun magsisiumula daw ang problema; kasi daw the Regular Oil already acts like a 'plug' or something.

[pajerokid]

If you ask me, the most telling sign of a blown engine is its propensity to consume engine oil! Pag mga 1L every month ang dagdag... medyo blowby pa lang...

Kung umabot ka sa stage na 1L a week.... medyo malala na yan.

Good luck! Keep us posted! :D

[vinj]

Yep, posible to since synths usually have lower viscousity levels then standard mineral oils. On older/high mileage engines, its recommended that higher viscousity oils are used.

I usually dont advise using additives or stuff...

Try to get a compression test first before doing anything.

My .007

Originally posted by Dieseler
Guys,

I read somewhere that Synthetic Oils are more 'manipis' than Regular Oil. Tapos an older engine that's used to regular oil will run ok, but when you put Synths eh dun magsisiumula daw ang problema; kasi daw the Regular Oil already acts like a 'plug' or something.

[Rod & Bubbles]

oil in the breather is not always a sign of blow-by. compression test of my engine is normal pero maraming oil sa breather. I change oil every 8 to 12 mos (maling mali yun ha). I don't notice oil consumption.

Synthetic oils are not manipis but instead , the particles are all uniform size. mineral oils have different sized particles. small particles burn off faster and the larger particles are left. these large particles do not lubricate as well and makes the engine wear faster. that is why synthetic oils are better.

[PapaBravo]

Still waiting for compression test results. Maraming nakapila kasi sa casa.

Ano bang engine oil brand na high viscosity (medyo malapot) na alam ninyo? Di ba ang shell helix for diesel ay malabnaw din. Any other alternatives?

[Olive Drab]

what are the chances of a blow-by engine to pass emission tests?

[PapaBravo]

Just got the results of the compression test for my Pajero 1995. Sa dry test 260 (ano bang unit of measure nito kaya - psi?). Tapos sa wet daw ay 300. That means na may difference na 40 na sabi ng technician yun daw ay more than the tolerance level of say 10.

Though he also said that the compression rate is not alarmingly low kaya lang may blow by nga na 40 (?).

What do you think guys? Anyone familiar with these figures and how to interpret them? Do I need to overhaul - as the technician suggested? Does anybody know of the normal compression levels for a Pajero 4d56 engine?

[jackaroo]

PapaBravo,
Just look at the SAE number of the oil, the higher the no the thicker it is, eg, SAE 40 is thicker than a 30 or 15w40. Also get one with at least API CF/CF4 rating.

The compression test should show results for each cylinder, in your case, 4 in total. Then compare them with normal compression figures that the casa should have- some manuals specify a minimum of 75% from standard.

The accuracy of compression gauges vary, so the important thing to look for in a test is that all cylinders are even, rather than the actual result.