Things that go bump in the night

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Things that go bump in the night

July 05, 2014 - 22:36
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Well, more like things that make strange unexplainable noises in the engine!!!!!
Yesterday we filled up at Blackdown, and I used the high volume truck pump like I always do. I then moved over to the airline while Sarah was inside paying. I was halfway round checking the tyres and I noticed there was a different noise coming from the engine. I assumed that because I was squatting down beside the rear wheel and the front of the truck was tight up against a steel shipping container, I was just hearing a certain frequency amplified. Maybe belt noise.
We drove another few hundred meters up the road to a shop Sarah wanted to go into, and I noticed the noise was still there. While she was inside I popped the bonnet for a better look/listen. It certainly wasn't like any normal belt noise, and wasn't coming from the usual places this engine makes belt noise from. If I had to pick a spot I would say front of the engine, the drivers side and rotational. All the belt driven stuff in on the passengers side of the engine. Needless to say there was a definite feeling of panic and a knot of dread in my stomach. Yay, serious engine trouble.

I was playing with the revs to see if it got better or worse, if it sped up with the engine speed etc, and it suddenly disappeared and didn't come back. Hmmmmm, ok, a strange rotational noise that magically fixes it's self. Just what you want. We did another 250k's that afternoon, stopping and starting and it was all ok. All of the pre start checks proved everything was as it should be the next morning, and we have done another 400 odd k's today, and it's running like a dream.
Needless to say I lay awake all last night staring at the roof churning away on possibilities. My theory is it was the injector pump. Dumping the fuel in from the high volume pump has stirred up some crud in the tank, which either restricted the pick up, or gave the lift pump a hard time, and the injector pump was struggling for fuel and was making some odd noises in complaint. My revving the engine relieved the blockage and it's sorted itself out. For now. Either that, or the cam belts about to break because the tensioner bearing has seized up, or a cam bearing has nipped up onto the cam shaft and is now wearing out the block, or the oil pump is wearing into the timing cover, or the cam pulley or injector pump pulley has come loose, or the fan bearing is about to fail.
Non of that makes sense, the only thing that does is the injector pump. It's all still going really well, better than ever, so who knows. Hope it doesn't bite me in some really inconvenient time and place!!!
Other than that, I have list count of the dead Roos and pigs, and we have all had a swim in the Reid River this arvo, so all is good!!! Pete.

Position Latitude: 
-19.76
Position Longitude: 
146.84
Position: 
19 45.506S 146 50.154E
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