Knocking sound from bell housing??? - Printable Version
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Knocking sound from bell housing??? - Lear35A - 08-28-2010
As part of my engine rebuild I replaced the clutch, flywheel (RSB 18#er), pressure plate and throwout bearing. Finally got the engine right (discussed on another thread), BUT...
There is a very noticeable knocking sound coming from inside the bell housing. The noise varies directly with rpm. It does seem to come and go, but I can't quantify anything that might be making it come and go (like pressure on the clutch pedal). Any ideas?
I've only driven car 1/2 mile and not above 3,000 rpm yet. The noise is there with the car running and sitting on jack stands.
Knocking sound from bell housing??? - flash - 08-28-2010
obviously a knocking sound is very bad, and you need to stop running it and find it
if it's in the bell housing, there are only a couple of things that can create it, all of which require pulling it back apart to find it and fix it - if i had to guess, i'd say it's related to the release bearing (like maybe the shims got put on the wrong side)
i would pull the plugs and spin the motor at starter speed to see if i could nail it down farther first though - if that doesn't tell you, then yank the bell housing side cover
Knocking sound from bell housing??? - Lear35A - 08-28-2010
With the clutch pedal depressed all the way the knocking goes away.
I've got the bell housing side cover off. I might recatagorize the noise as a rattle rather than a knock. Tough to tell. I can't see anything obvious inside the bell housing. I don't have anyone here to push on the clutch while I'm looking into the bell housing, so further trouble shooting will have to wait.
Knocking sound from bell housing??? - Lear35A - 08-29-2010
Here's a picture looking into the bell housing. Anything look wrong?
Knocking sound from bell housing??? - Johannvb - 08-29-2010
Looks correct to me. I am just wondering if it could be the bolt going into the half shaft that might be slghtly proud?
Have you turned the motor while you are down there? If not that would be my next step. Maybe have someone turn the engine by hand at the crank and then you can listen for the sound while down there?
Knocking sound from bell housing??? - Lear35A - 08-29-2010
Well...I started the engine again with the bellhousing cover off. Low and behold, no noise. So I drove it around the block with the cover off. No noise. Put the cover back on. No noise. Everything in there was new; maybe something had to "break in" a little. Can't imagine what it would be though. In any case, this is no longer an issue until further notice.
Knocking sound from bell housing??? - flash - 08-29-2010
lol - whatever it was, it fell out?
Knocking sound from bell housing??? - Cloud9...68 - 08-29-2010
"lol - whatever it was, it fell out? "
Yeah, I'd get under there again with the bell housing off and a good light, and make sure nothing vital is missing...