Engine sound like hammering in Pajero GLS 3.5 2017

[K B]

Hi everyone

I have Pajero GLS 3.5 / 2017 / 75K KM run. My car was flooded couple of weeks ago and I have got it fixed with all recommended parts from the garage like timing belt & related items, spark plugs, alternator bearing and related items (not belt), air filter, engine oil, gear oil and few minor items. Car engine was not hydro-locked so no work was done on the engine interiors.

Last evening I started my car to go somewhere and immediately after start, a loud hammering sound started coming from engine compartment. Sound was really loud and something like tak tak tak.  I did bit of visual inspection but didn't notice anything unusual. Still to be on safer side I haven't driven the car and left it in peace so far.

Please guide me what exactly is the issue and how much it cost to fix. I already paid enough to fix previous repair and don't want to ripped off again. Yes one notable thing post first repair was that my car has started vibrating when at idle and ac is switched off /cut off. After flood repair I have run the car for 600-700Km and even added Mitsubishi fuel system cleaner to get rid of idle vibration issue as suggested by garage

Thanks in advance for you help.

[GauravSoni]

1 hour ago, K B said:

Hi everyone

I have Pajero GLS 3.5 / 2017 / 75K KM run. My car was flooded couple of weeks ago and I have got it fixed with all recommended parts from the garage like timing belt & related items, spark plugs, alternator bearing and related items (not belt), air filter, engine oil, gear oil and few minor items. Car engine was not hydro-locked so no work was done on the engine interiors.

Last evening I started my car to go somewhere and immediately after start, a loud hammering sound started coming from engine compartment. Sound was really loud and something like tak tak tak.  I did bit of visual inspection but didn't notice anything unusual. Still to be on safer side I haven't driven the car and left it in peace so far.

Please guide me what exactly is the issue and how much it cost to fix. I already paid enough to fix previous repair and don't want to ripped off again. Yes one notable thing post first repair was that my car has started vibrating when at idle and ac is switched off /cut off. After flood repair I have run the car for 600-700Km and even added Mitsubishi fuel system cleaner to get rid of idle vibration issue as suggested by garage

Thanks in advance for you help.

That’s definitely not a good sound to hear… does your car temp show high… ideally it should be just below the center marker… check if it shows high.. the clank noise and vibration can be due to a damage in the crankshaft/ piston.. bear  in mind that any such issue can be a bit heavy on the pocket..did u replace the water pump? M no mechanic but one way to test could be to do a compression test on all 6 cylinders… 

[K B]

On 12/10/2023 at 2:18 PM, GauravSoni said:

That’s definitely not a good sound to hear… does your car temp show high… ideally it should be just below the center marker… check if it shows high.. the clank noise and vibration can be due to a damage in the crankshaft/ piston.. bear  in mind that any such issue can be a bit heavy on the pocket..did u replace the water pump? M no mechanic but one way to test could be to do a compression test on all 6 cylinders… 

Thanks Gaurav for the revert. I have replaced the water pump but missed to mentioned. As per the latest feedback from garage there was issue with hydraulic tappet and they have fixed it and no more sound. I haven't got the car so far as they are still checking for any other potential issue. I'll ask them for compression test but not sure if they can do it as the garage is not very high tech.

I have not faced the temperature raising issue as I have not driven from the time I noticed the sound. Rest will update once I have the car.

[Ahmed Farouk]

To differentiate if the sound is coming from the cylinder head or the crankshaft, try to hear the sound from the bottom side even near the wheel , if it is something from the top part of the engine u shall not hear it loud near the wheel 

this only to know if it related to the cylinder head or the crankshaft, hope it is not from the lower part of the engine as this maybe something serious 

[K B]

On 12/14/2023 at 9:51 PM, Ahmed Farouk said:

To differentiate if the sound is coming from the cylinder head or the crankshaft, try to hear the sound from the bottom side even near the wheel , if it is something from the top part of the engine u shall not hear it loud near the wheel 

this only to know if it related to the cylinder head or the crankshaft, hope it is not from the lower part of the engine as this maybe something serious 

Thanks the sound was from hydraulic tappets and it was fixed after cleaning and adjuster. I am traveling so still not driven the car and this was feedback from the garage. Thanks for revert.