Engine squeal - Clutch release bearing??
I built up my recent engine and put it in the car. Lots of brand new parts. Including new clutch and so on.
It was on the rolling road and had been started after initially being very difficult to start. I don't know if it was a bad earth or starter motor, but initially could only get it to crank at about 250rpm, rather than the say 750rpm for the crank position sensor to read.
The garage somehow got it to crank properly, fire up and idle. It was running nicely for say 10 minutes or so whilst the throttle bodies were balanced. After about 10 mins it started to squeak / squeal. First of all we thought it might be auxiliary belt, or water pump pulley. We disconnected that - but the squeak was still there. With some careful listening we think we tracked the noise to the back of the engine. So, we put the car up on the ramp and with the engine running you could hear the noise, with that little plate removed, sounding like it was coming from the rear of the engine still. With the engine off we rotated the engine and it sounded as if the squeak was coming from somewhere around the rear oil seal, clutch shaft and when rotated with a ratchet on the crank pulley it sounded as if there was some pick-up some where at one point in the rotation. The end of the day came so we shut everything off. I gave instructions next day for the garage to take the gearbox out and have a look. They found nothing so, had to ask the garage to take the engine apart and inspect. They found what they thought might be damaged bearing shells - so the engine went back to the engine builder. Went and met the engine builder with the engine and at first we suspected oil pump failure - but that would have seized the engine with 10 mins of running. We inspected everything and then the engine building garage owner said ' do you have the clutch with you?' as some parts had been left in the car. I didn't, but in the box of engine parts was the clutch release bearing. On looking at it we noticed that although it was brand new, the centre looked very slightly off centre and it was as if one part was almost touching the outer casing. I will try and take a photo of this and show you later.
Has anyone had any similar problems to this before? It is possible that I may be looking in the wrong direction - but we really couldn't find a better culprit. Fortunately nothing in the engine is damaged - so it is going to be just the cost of another rebuild, but unless i can find the problem I am going to have to re-build it and hope that the problem is not there next time..... hmmm. Any thoughts??