All Things Mk5 > Mk5 General Area
Weird rattle! Passenger side. -6.0°KW Camshaft Block 93
OllieVRS:
Oil pressure is still within spec.
Interestingly, throughout my whole oil pressure testing I didn't hear the rattle once!
To complicate things even more, have a look at this:
Back down to -4.0°KW, oil at 85°C. And block 91 act. is within 1°KW of spec. Self repairing engine?
Mustn't be rod knock then :drinking:
OllieVRS:
Little drive done and she's still at -4°KW, block 91 within spec too.
The rattle stops when I open the bonnet
What mechanisms are affected by opening the bonnet?
bobby_fodge:
--- Quote from: OllieVRS on June 19, 2023, 10:31:36 pm ---Little drive done and she's still at -4°KW, block 91 within spec too.
The rattle stops when I open the bonnet
What mechanisms are affected by opening the bonnet?
--- End quote ---
That's odd.
Is the locking mech where the hook on the bonnet sits coming loose?
Have you left a hand tool in the engine bay that the bonnet rests on when closed?
Any witness mark on the underneath of the bonnet from anything rubbing it?
pudding:
At 128K miles, it could very well be the chain. The classic symptom of that is a diesel like clattering at a hot idle, which is most noticeable inside the car.
You can't hear it in the engine bay due to all the other noises going on under there, and noises bounce off other hard surfaces and also transmit from one end of the engine to the other, so it's just noise soup under there.
It could also be DMF rattle as it's hard to tell with smartphone microphones, but that you definitely will hear in the engine bay.
I recommend getting a stethoscope from Amazon!
OllieVRS:
Thanks for the responses guys.
--- Quote from: bobby_fodge on June 20, 2023, 12:18:37 pm ---
--- Quote from: OllieVRS on June 19, 2023, 10:31:36 pm ---Little drive done and she's still at -4°KW, block 91 within spec too.
The rattle stops when I open the bonnet
What mechanisms are affected by opening the bonnet?
--- End quote ---
That's odd.
Is the locking mech where the hook on the bonnet sits coming loose?
Have you left a hand tool in the engine bay that the bonnet rests on when closed?
Any witness mark on the underneath of the bonnet from anything rubbing it?
--- End quote ---
No tools left in the engine bay, good suggestion though.
Started her up today. No tapping sound. Starting to think it's the RAMAIR cone filter's metal edge bouncing off the bonnet, as it's adjusted quite high up to avoid bouncing off the coolant pipe. Although from a not-so-technical inspection it seems impossible, nor did I find any witness marks under the bonnet or on the edge of the cone.
--- Quote from: Pudding on June 20, 2023, 02:44:55 pm ---At 128K miles, it could very well be the chain. The classic symptom of that is a diesel like clattering at a hot idle, which is most noticeable inside the car.
You can't hear it in the engine bay due to all the other noises going on under there, and noises bounce off other hard surfaces and also transmit from one end of the engine to the other, so it's just noise soup under there.
It could also be DMF rattle as it's hard to tell with smartphone microphones, but that you definitely will hear in the engine bay.
I recommend getting a stethoscope from Amazon!
--- End quote ---
I know what you mean Pudding, but as far as I can tell it otherwise sound like a run-of-the-mill, average mileage TFSi. No diesel sound. I have a friend with a low mileage AXX that runs quieter, somehow.
I forgot to answer this earlier, but being in neutral, pedal in/out or in gear had no affect on the sound on my drive. Sound at idle, sound on over-run, little to no sound on accel. Clutch pedal feels absolutely perfect since my shim fix.
Anyways, on that startup today I logged the degrees again, started off at -4°KW and went up to -6°KW as the engine warmed up. Bizarrely no rattle.
I'll aim to replace the chain tomorrow, because rattle or no rattle, -6°KW means the chains on 'borrowed time', if I can quote you correctly @Pudding
I'll post an update again tomorrow, hopefully with concrete results.
Cheers guys
Navigation
[0] Message Index
[#] Next page
[*] Previous page
Go to full version