Popping sound :-(

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8619Simon

Member
Posts
73
Location
North Wales - Bethesda
Landy issue

I have just done a service and replaced the oil, oil filter, air filter and fuel filter. All that might not be relevant but on starting her up all seemed fine except that I can hear a knocking / popping sound from the air intake. I've done some searching head gasket or associated seemed to come up on a regularly! This is what I've checked so far:

Defender 1995 300TDI

  • Oil - nice and clear no whitening etc
  • Exhaust - puff of black at start up then nice and clear, only slight puff when hoofing it
  • Header tank - No diesel smell and water / coolant seems clean, no white froth or bubbles - you can see water / coolant rushing into the tank when the engine is revved, I presume this is normal - no real pressure build up.
  • Temperature - sits at half way most of the time only rises to 2/3 on a steep hill if I keep the speed up - running at idle and normal temp the top heater hose is still flexible.
  • Engine - no obvious oil leak and it hardly uses any oil, the only obvious leak is a small amount from rocker cover gasket (on my to do list)

Linky to the popping sound here https://www.dropbox.com/s/u0dqix1qk605zip/Popping%20sound.m4a

Video of header tank here https://www.dropbox.com/s/j7tdbpmkidq3y6g/Header%20tank.MOV

Would appreciate any thoughts or other tests I could try. It had a new Turner engine in 2010 and has only done 14,000 miles so I'm hoping it's not the dreaded HG failure.

Cheers

Simon
 
Sounds like yer run over an angry dwarf with a hammer. Park it in a river and drown the little feker.
 
Slide your hand behind cylinder head nearest bulkhead!! with engine running !! If you feel pulses of escaping air then head gasket ! Shine a torch around manifold area and look for puffs of smoke !!!had a 300 tdi at work today exact same problem ! Was head gasket!!!
 
Cheers for that, no obvious sign of any puffs of smoke from manifold area but will also check at the back of the block.

I have just put the old air filter back in and the noise has gone almost completely :confused: put the new one back in and same noise again! Is one model / brand of air filter likely to do this? The new air filter is a Mahle one, the one I took out looks more open.



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