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Fallos de Motores Diesel por Dilusion y Carbono

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Information about Fallos de Motores Diesel por Dilusion y Carbono

Published on December 11, 2007

Author: manuelrojasnadal

Source: slideshare.net

Description

La Dilusion (pase de combustible Diesel por combustion incompleta al carter) origina desgaste y deposicion de carbono.
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http://www.up.ac.za/academic/mae/research/design/diesel-lube1.pdf DIESEL ENGINE FAILURES DUE TO FUEL WITH INSUFFICIENT LUBRICITY

Although the majority of soot produced during combustion exits through the exhaust, some passes through the rings of the combustion chamber and enters the engine oil. As long as these soot particles remain suspended in the oil and are not allowed to agglomerate they pose little risk to engine parts.

It is up to the motor oil’s dispersants to keep soot particles dispersed. However, in high soot conditions, dispersants can become quickly depleted. Once this happens the soot particles rapidly agglomerate to form particles with diameters well over a micron.

Effect of Soot Agglomeration

Diesel Engine Car IC: 3.0 MD: 75 DP: 75 Very high quantity of soot due to a long draining period Diesel Engine Car IC: 0.5 MD: 28 DP: 36 Poor dispersancy due to a coolant leak Hydraulic Shovel IC: 0.3 MD: 60 DP: 12 Feeble dispersancy; poor engine cooling

Truck IC: 1.1 MD: 85 DP: 16 The combustion is correct but the disper- sancy is slightly degrading due to oil oxidation as the result of a tiring engine Gas Engine IC: 0.2 MD: 65 DP: 7 Poor dispersancy due to an extended drain interval Marine Diesel Engine IC: 0.2 MD: 59 DP: 8 High lubricant contamination with heavy fuel Worksite Truck IC: 0.8 MD: 95 DP: 4 Good combustion and good dispersancy

CENTRIFUGE

CENTRIFUGE

K2 GS500 Right Piston The right piston just removed during engine overhaul. Nice big carbon deposits here.

Figure 3. Valve Figure 2. Valve with severely guttering or recessed (worn) torching sealing face

Figure 4. Valve deck from a Caterpillar 3512TALE natural gas engine showing very low to absent varnish and sludge

Figure 5. Cylinder head from a Caterpillar 3512TALE natural gas engine showing very low deposits after 8,824 hours

Figure 7. Oil pan shows very low to absent varnish and sludge

Figure 8. Piston undercrown shows extremely low varnish deposits

Figure 9. Piston ring zone from a Caterpillar 3512TALE natural gas engine after 8,843 hours shows extremely low carbon deposits.

Figure 10. Piston liner shows very low polishing

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