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  1. Join Date
    Aug 2012
    Posts
    61
    #1
    Hi to all

    First of all, I should have titled this post "4g15 engine knock near crankshaft pulley question" for specific and clarity.

    I recently heard a knocking sound sa engine ko during start and after driving 6km (3km back and forth hatid sundo sa mga bata). At first tikitik pa lang ang sound and I thought need ko lang valve adjustments (which I haven't checked actually) and it goes away after the engine has heated.

    But now lumakas na siya at tokotokotokotok na ang naririg ko. This happens after taking away 300ml of oil kasi sa dipstick ko lagpas.

    According sa manual ko ay 3.4 liters ang required, pero lumalagpas siya sa dipstick ko kaya binawasan ko till pumantay sa high level.

    Initially I thought it was my tensioner pulley (which is used by my ac compressor) kasi may history na ako na check ko siya at spacer ang problema sa pag wiggle nya. I check again after I hear the knock sound kasi dun nanggagaling sa side ng mga pulleys. After removing the tensioner pulley, start the engine. I still hear the knock sound.

    So na rule out ko na yung tensioner. Drove the car today hatid sa mga bata and I still hear the knock sound.

    I drove the car to my mechanic and said it could be the oil pump not pumping oil kaya maaring main bearing sa crankshaft yun. I did try to hear using his improvised stetoscope at mukha nga sa crankshaft nanggagaling malapit sa crankshaft pulley. (Initially I thought sa water pump bearing pero mahina yun knock sound dun, I have water pump replacement ready naman and it was schedule for a change naman na pero ironically hindi sa water pump ang knock sound)

    My mechanic suggested for a engine overhaul since need daw baklasin yun makina to see the problem and since baklas na ay ipa-overhaul ko na din daw.

    Now, pag-uwi ko I thought na ibalik yun 300ml + na binawas ko ang I was surprised na nawala ang knock sound. I can still hear using my tubo hearing technique pero napaka hina na at hindi na talaga marinig kung wala yun tubo hearing aid ko.

    I let the car cool for hours ( mga 6 hours na ata naka park), tried to start the engine again at narinig ko ulit, pero mga 2-3 mins nawala.

    Now one of my neighbor mechanic said that it could not be the pump kasi pag susi ko I do see the oil warning sign sa dash and upon start nawawala.

    The knock sounds like in this video https://www.youtube.com/watch?v=XDTot5kRAG0 pero hindi siya naririnig sa loob ng kotse that much at pag napaandar mo na hindi na marinig. Unlike sa video na na-idrive na at malakas tunog so I rule out na crankshaft pulley problem ko.

    Although the crankshaft pulley seems to wiggle na sa side kung saan nakakabit ang belt ng AC compressor at tensioner pulley.

    So guys, possible ba na bearings sa crankshaft naririnig ko since nawala siya nun nagbalik ako ng oil?

    Need ko na ba talaga magbiyak ng engine or need ko lang magpalit ng oil pump? Or hindi maganda ang current oil ko and should a change oil will fix the problem?

    My last oil change was 2,900 km ago, nagpalit ako after 5,000 km and upon buying the car last Nov 2013.

    138,000+ when I got the car Nov 2013 = changed oil using Shell 20w50 (From Shell Station service mismo ako nagpa-oil change free service + filter)
    143,000+ = changed oil using Petron Ultron 20w40 (Bought the oil from Petron, changed the oil filter and oil myself)

    Current mileage = 145,900 +

    PS:
    I constantly check my oil levels at wala po akong leak.

    TIA

  2. Join Date
    Feb 2009
    Posts
    5,130
    #2
    Check oil pressure with a gauge first. Do the least intrusive approach or procedure. The pump is just behind the pulley and serviceable even when the engine is on board.


    Posted through phlpost.gov.ph

  3. Join Date
    Jun 2011
    Posts
    134
    #3
    possible connecting rod bearing failure...

  4. Join Date
    Oct 2009
    Posts
    2,271
    #4
    nako po wag ka muna basta basta mag papa biyak ng makina nangyari na sa akin yan..naka budget nadin ung pera ko.pero after na pina valve tappet ko ko after ng 1 week nawala ung toktok sound sa makina ko.mag 1 year na din sabi ng mekaniko ko hatawin ko lang daw ng hatawin para lumbas talaga ang problema ,after ng valve adjustment un nawala ung katok..pareho tayo nung una sa akin tikkitikitik lang...pero nung tumagal tok tok tok na.

    dinig na dinig mo talaga lalo na sa gabi..

    eto ang link ng post ko..akala ko matutuluyan na..pero un lang pinagawa ko..after 1 week bigla nalang nawala.

    http://tsikot.com/forums/engine-fuel...ti-96-a-92958/
    Last edited by jaypee10; September 26th, 2014 at 04:38 PM.

  5. Join Date
    Aug 2012
    Posts
    61
    #5


    Here's the noise, and it turns out to be just a loosened crankshaft pulley. I've re-tightened it and the noise is gone.

    This video helps me on the procedure

    Thanks for the suggestions and help.

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4g15 engine knock question