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    新聞資訊
    機油壓力不足的原因是?
    來源:: 時間:2017-08-16

    發動機工作時正常的機油壓力應保持在0.25~0.35 Mpa。若機油壓力低于0.2 Mpa,或機油壓力忽高忽低,說明潤滑系統有故障,機油壓力不足,必須及時查找原因予以排除。 

    1.油底殼內機油量不足   

    機油量不足,機油泵的泵油量下降,甚至還會吸入空氣,應按規定加足機油。若機油量不足是由于燒機油或滲漏引起,還應排除燒機油或滲漏故障。   

    2.油質不符合要求   

    不同機型使用不同級別的機油,就是同一機型在不同季節也使用不同牌號的機油,若錯用機油往往會導致機油粘度過稀、壓力不足故障,應按規定使用。另外,機油長期使用后,易氧化變質,粘度下降,潤滑性能變差,必須及時更換。   

    3.機油中混入燃油或水分   

    若燃油混入機油,會將機油稀釋;若水分混入機油,會使機油乳化變質,這些都會降低機油的潤滑效果,必須更換機油,同時找出燃油、水分混入機油的原因并予以排除。   

    4.機油溫度過高   

    當冷卻系水垢嚴重、散熱不良或長時間超負荷導致發動機溫度過高時,機油會變稀;若缸套與活塞配合間隙過大,氣缸內高溫燃氣竄入曲軸箱,也會使機油溫度升高而變稀,易于從摩擦副配合間隙中流失。   

    5.機油濾網堵塞或進油路漏氣   

    當機油集濾器濾網堵塞時,機油泵不能吸入足夠的機油;當進油管有裂紋或管接頭墊片不平、未擰緊,或泵體與機體間結合面不平、紙墊損壞(如單缸柴油機)時,機油泵會吸入空氣,這些都會導致機油壓力不足。應清洗或更換濾網,更換吸油管、墊片,擰緊管接頭。   

    6.泵油壓力不足   

    當齒輪泵軸與襯套、齒輪端面與泵殼間隙,齒側間隙或徑向間隙因磨損而過大時,或轉子泵軸與襯套間隙,轉子徑向及端面間隙因磨損而過大時,都會使泵油壓力下降。另外,泵體與泵殼間紙墊過厚、外轉子倒角裝反時,泵內泄漏嚴重,也會導致泵油壓力下降。應予修磨或更換。   

    7.限壓閥漏油嚴重   

    當限壓閥彈簧折斷,閥芯與閥座磨損或被雜質卡滯而關閉不嚴時,主油道內機油大量漏入油底殼。應更換彈簧,修磨閥芯。   

    8.機油濾清器及主油道堵塞   

    這時機油泵內泄漏損失增加,而軸瓦等摩擦副因機油量不足易于燒蝕,應予清洗疏通。   

    9.摩擦副泄漏損失增大   

    當單缸柴油機的主軸承蓋與座孔配合間隙過大、軸頸與軸瓦配合間隙過大時,機油易大量漏失,導致機油壓力下降。這時可在單缸柴油機的主軸承蓋上加墊牛皮紙墊堵漏;更換軸瓦,修磨軸頸。   

    10.機油冷卻噴嘴漏油   

    在一些直噴式大功率柴油機曲軸箱主油道上,裝有機油冷卻噴嘴,向活塞內腔噴射機油幫助冷卻各缸活塞。若機油冷卻噴嘴松動或閥芯嚴重磨損,機油會從此噴嘴中大量漏入油底殼,導致軸瓦因得不到足夠壓力和流量的機油潤滑而燒蝕。應擰緊噴嘴,修磨或更換閥芯。

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