What's making the noise ?
My 2 ltr Giulia Ti Super Replica is nearing being finished. When I bought the car there was so much wrong with it it was untrue, however, the worst problem, was that I'd found that the guy who'd previously "built" the engine, had no idea, and had run it for around 700 miles with the distributor inserted the wrong way round. He'd also used a different exhaust front cam cap, so the cam timing was impossible to get right, I re-marked the cap with the correct timing mark, using the Spruell template and it timed up perfectly first time. I think he may have tweaked a valve very slightly messing about trying to get it right, as there's less compression on number 3 cylinder than the others, but that's for later.
I've now finally got round to having a look, and took the sump and oil pump off the car, (engine in situ), last week, and got the front cover off today (cylinder head left in situ as the gasket hadn't had time to get stuck, it came off ok).
The problem was, that although it is an instant starter (now that I'd timed both the cams and the ignition correctly), and it revs freely, and goes very well, there is an unholy row from the timing cover.
I bought a new chain, as the tensioner was so far out, it was in danger of departing the front cover, and this brought the tensioner back to being about 5mm out, so thought I'd cracked it. No difference.
Having got the cover off today, I'd expected to find maybe the bush for the idler gear in the block goosed, and maybe the one in the cover too. maybe he'd forgot the oil slinger ?
No such luck. Whilst there's a minimal amount of movement noticeable in the block / timing cover bushes when the cover is off, , when I trial fit the cover there's almost no movement when it's supported at both ends, and spins freely. The front and rear idler gear oil bushes are good too. Sprockets all good.
The only part I can discern any excess movement in now, is the tensioner sprocket bush, but not so bad that it's nearly falling out, probably about 15 thou "wobble" as I rock it with my fingers, (chain off).
So what else can be making this noise ? The noise at idle is louder than anything else .
Valve clearances are good and quiet, water pump is new and quiet, bottom timing chain isn't too worn, oil pump has no real end to end play on the shaft, the bronze gear and it's mating part on the crank are undamaged and yet the noise is definitely coming from inside the front cover.
It's not big end or mains bearing play, as I checked a couple of both when I took the sump off, and they're almost unmarked.
I've checked the oil pump shaft for straightness as best I can, and can't see that it's bent. I put it back in the cover today with the distributor, and fastened it up. it spins freely .
Any more ideas anyone ? Have I missed something ?
Giulia Ti Super Rep yet to finish. BMW 2000 NK to Ti spec
Last edited by GTA R; 11-28-2016 at 02:30 PM.