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Spuma la joja si capac motor!


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So how often should I change my oil?

 

You can never change your engine oil too frequently. The more you do it, the longer the engine will last. The whole debate about exactly when you change your oil is somewhat of a grey area. Manufacturers tell you every 10,000 miles or so. Your mate with a classic car tells you every 3,000 miles. Ole' Bob with the bad breath who drives a truck tells you he's never once changed the oil in his car. Fact is, large quantities of water are produced by the normal combustion process and, depending on engine wear, some of it gets into the crank case. If you have a good crank case breathing system it gets removed from there PDQ, but even so, in cold weather a lot of condensation will take place. This is bad enough in itself, since water is not noted for its lubrication qualities in an engine, but even worse, that water dissolves any nitrates formed during the combustion process. If my memory of chemistry serves me right, that leaves you with a mixture of Nitric (HNO3) and Nitrous (HNO2) acid circulating round your engine! So not only do you suffer a high rate of wear at start-up and when the engine is cold, you suffer a high rate of subsequent corrosion during normal running or even when stationary.

The point I'm trying to make is that the optimum time for changing oil ought to be related to a number of factors, of which distance travelled is probably one of the least important in most cases. Here is my selection in rough order of importance:

 

Number of cold starts (more condensation in a cold engine)

Ambient temperature (how long before warm enough to stop serious condensation)

Effectiveness of crank case scavenging (more of that anon)

State of wear of the engine (piston blow-by multiplies the problem)

Accuracy of carburation during warm-up period (extra gook produced)

Distance travelled (well, lets get that one out of the way)

 

sursa carbible.

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So how often should I change my oil?

 

You can never change your engine oil too frequently. The more you do it, the longer the engine will last. The whole debate about exactly when you change your oil is somewhat of a grey area. Manufacturers tell you every 10,000 miles or so. Your mate with a classic car tells you every 3,000 miles. Ole' Bob with the bad breath who drives a truck tells you he's never once changed the oil in his car. Fact is, large quantities of water are produced by the normal combustion process and, depending on engine wear, some of it gets into the crank case. If you have a good crank case breathing system it gets removed from there PDQ, but even so, in cold weather a lot of condensation will take place. This is bad enough in itself, since water is not noted for its lubrication qualities in an engine, but even worse, that water dissolves any nitrates formed during the combustion process. If my memory of chemistry serves me right, that leaves you with a mixture of Nitric (HNO3) and Nitrous (HNO2) acid circulating round your engine! So not only do you suffer a high rate of wear at start-up and when the engine is cold, you suffer a high rate of subsequent corrosion during normal running or even when stationary.

The point I'm trying to make is that the optimum time for changing oil ought to be related to a number of factors, of which distance travelled is probably one of the least important in most cases. Here is my selection in rough order of importance:

 

Number of cold starts (more condensation in a cold engine)

Ambient temperature (how long before warm enough to stop serious condensation)

Effectiveness of crank case scavenging (more of that anon)

State of wear of the engine (piston blow-by multiplies the problem)

Accuracy of carburation during warm-up period (extra gook produced)

Distance travelled (well, lets get that one out of the way)

 

sursa carbible.

 

FOARTE INTERESANT ! si chiar sunt lucruri adevarate si la obiect ! deci : intervalul de schimbare a uleiului din motor nu depinde numai de numarul de kilometri parcursi intre schimburi.

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la mine nu funcitoneaza deloc la temperatura optima ca nu reuseste sa mio ridice de nici un fel la 90....tot mai jos imi sta!!! de ce....nu stiu ,,,,

Cel mai pornografic post de pe intreg forumul :) :) :twoup:

 

Scuze dar chiar nu am putut sa ma abtin :( :D :)

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la mine nu funcitoneaza deloc la temperatura optima ca nu reuseste sa mio ridice de nici un fel la 90....tot mai jos imi sta!!! de ce....nu stiu ,,,,

Cel mai pornografic post de pe intreg forumul :) :) :twoup:

 

Scuze dar chiar nu am putut sa ma abtin :( :D :)

 

 

 

stricam topicu .... dar raspunsu e VIAGRA:))))

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  • 10 months later...

Azi am vazut si eu putina chestie alba pe joja....uleiul e schimbat de vreo 3 saptamani.

Same story, 4-5 km pana la lucru, apa ajunge la 90 grade abia inainte de a ajunge in parcarea de la munca.

Cred ca e o idee buna sa se schimbe uleiul inainte de iarna.

Tampenia aia de valva PCV are vreo influenta in eliminarea condensului?

La mine e moarta, trebuie sa o schimb saptamana viitoare....

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  • 4 weeks later...

Vad ca esti fericit.

:))

Sa te fereasca domnu pentru schimb de garnitura, ca e mult de munca.

La mine dispare un pic de apa, din cand in cand, nu am in ulei, dar se duce undeva, nu vad sa pierd, am schimbat pompa, termostat, am luat radiator azi, daca nu scap de consumul de apa, sigur e ciupita garnitura si la mine, nu e ingrijorator consumul de apa, undeva la 1L la 2 saptamani...

E de munca pentru schimbat garnitura, daca tot sunt acolo o sa schimb si distributia, axele de m3, repar vanosul, asta cand strang bani de unele piese :lol:)

 

Salut, am aceeasi problema, imi cam papa antigel. Problema e ca nu se vede in ulei, iaru uleiul e schimbat de 12.000 km si a cam scazut. mai are o gradatie si e pe minim.

Am fost ieri la astia si (noroc ca e in garantie) le-a recomandat Germany sa-mi desfaca chiulasa sa vada daca nu e de acolo, deoarece au vazut ca a facut presiune foarte mare intr-un furtun...

Ceva sfaturi legat de problema mea? Rezolvari?

La tin e cum s-a rezolvat?

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  • 2 weeks later...

de unde doamne iarta-ma sa apara condensul acolo?...intreb si eu, dar mi se pare absurditatea absoluta treaba asta cu condensu care ajunge in baia de ulei in asa cantitati ,care prin amestec cu uleiul si apoi prin barbotare, sa-ti dea spuma pe joja...nu cred in veci treaba asta cu condensul...apa,in schimb, e clar ca ai in motor din moment ce joja are spuma galbuie pe ea...

condensul nu se formeaza in baie ci pe capacul de culbutori inde in contact cu vaporii de ulei calzi se formeaza acea spuma. omu nu are spuma in baie. are e buson si pe joja deci in zonele in care propriu zis nu ajunge uleiul numai vaporii lui.capisci?

 

FOARTE INTERESANT ! si chiar sunt lucruri adevarate si la obiect ! deci : intervalul de schimbare a uleiului din motor nu depinde numai de numarul de kilometri parcursi intre schimburi.

se stie ca degradarea uleiului e cauzata in cea mai mare parte de schimbarile de temperatua (adica porniri si opriri la scurta distanta deci incalzirea apoi racirea si tot asa a uleiului)nu de folosinta lui.si folosinta lui il degradeaza dar nu in asa mare masura. de aia camioanele care fac cate 1000 de km odata merg cu uleiul 100.000km printre altele.

 

la mine nu funcitoneaza deloc la temperatura optima ca nu reuseste sa mio ridice de nici un fel la 90....tot mai jos imi sta!!! de ce....nu stiu ,,,,

totusi ce masina ai sa inteleg de ce nu ti se ridica temperatura?la apa bineinteles

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daca era diesel ma gandeam ca poate l-a lasat si termostatu egr de nu i se ridica dar asa cred ca nu a nimerit un termostat bun. cu toate ca wahler e marca de prima mana. as incerca un behr totusi. ala e originalu pe bmw.
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Nu te speria ca si eu am patit identic cu tine in iarna asta.Cat am mers la drum lung nu mai aparea nici o problema ,iar cat am mers de acasa la serviciu si dupa 8-10 ore iarasi inapoi (total 5km traseu), TIMP DE 2 LUNI(IAN-FEB), mi-a aparut aceeasi problema. Si cu fumul alb dimineata aceeasi problema.

La un moment dat am facut un drum de Alexandria - Calarasi (500 KM )si la 2 zile un drum de Alexandria - Medias (700 KM)dupa care nu s-a mai vazut nimic. Eu eram gata sa ma apuc sa desfac motorul. In privinta antigelului ,din discutii cu 2 mecanici, mi-au spus ca e ceva normal ca la o anumita perioada sa se mai completeze cu lichid de racire. E anormal sa faci asta foarte des si aici pot fi mai multe cauze. Si eu am masina sub observatie si revin cu amanunte daca se intampla ceva. Mentionez ca masina este E39 cu motor benzina de 2500 cmc( M52B25).

Treaba cu incalzitul motorului, e din sonda de apa sau din ceasuri, asa am patit si eu. Mi-am dat seama deoarece motorul era cald( iar acul cand urca cand cobora). Adica in anumite momente nu mai indica deloc. Altfel ar trebui ca motorul dupa ce ajunge la 90 de grade sa scada la 40 de grade, ca la mine asa se intampla(mi-e greu sa cred).

Edited by wolf
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  • 3 weeks later...

deci? care e verdictul?

Fisura la cilindrul 2. Imi facea presiune in vas si pana la urma a cedat acel capac de plastic ce acopera termostatul.Culmea, asta s-a intamplat cu motorul cald la ralanti(eram cu cineva de vorba). Semnele de spuma mi-au aparut cand am mers distante scurte.Ca si concluzie pentru mine cand apare spuma poate fi asta,fisura la cilindrii(fisura foarte mica),garnitura de chiulasa si fratilor,sa nu bagati Metabond in motor!!! La o saptamana dupa ce am bagat porcaria aia s-a ales praful de motorul meu!!!

Edited by wolf
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  • 1 month later...

Inspumarea uleiului din cit stiu este o problema foarte grava. Mai exact si-a pierdut proprietatile de ungere. Si in mod sigur nu este vorba de condens. Ai mai adaugat si aditivi de ulei? Sau ai schimbat tipul de ulei la ultimul schimb? Au tras tot uleiul din motor la ultimul schimb? Filtrul de ulei banuiesc ca l-ai schimbat... Si ca o adaugare la acest topic pornirea la sub 5 grade celsius se face cu doua chei scurte pe demaror fara sa pornesti motorul astfel incat pompa de ulei sa apuce sa arunce ulei in capul pistonului. Dupa ce ai pornit motorul astepti 1-2 minute sa-si faca ciclul apoi pleci de pe loc. Incalzirea motorului se face in sarcina la 2000 rpm. Caldura oprita si mergi minim 3 km pina la prima oprire a motorului astfel incat sa ajunga la parametrii normali de functionare. Uleiul din cutie se incalzeste mult mai tarziu 30-40km. Rezervorul de benzina trebuie sa fie aproape plin pe tot timpul iernii pentru ca acolo se formeaza condensul si afecteaza buna functionare a motorului. Alte idei? In afara de masina tinuta in garaj incalzit la min 5 grade?

mai studiaza despre circuitul de ungere si arata-ne si noua pe unde arunca pompa ulei in capul pistonului. la un motor bun nu ajunge uleiul acolo nciodata. iar alea cu 2 chei sunt de pe vremea cand baga bunu ulei m40 in aro.

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