Hamonic Balacer Shaking

[AndrewJZX100]

Ok just put a 2nd hand RB20 from a ceffy into my silvia (previously had an R32 RB20) and after the joys of having to swap every fking sensor over so I could use my old 32 engine loom, I've started it up and seen that the harmonic balancer is shaking like an epileptic with parkinsons

I've checked the main bolt on the end of the crank and thats tight. Theres 2 snapped bolts out of the 6 or so smaller ones (the ones that are left are tight) but I wouldn't think that would cause the good 10mm of play that the harmonic balancer has. It's wobbling so much it's taking chunks out of the timing belt cover behind it

I've been told a possible cause is the end of the crank is bent. I want to believe there is possibly another, not so expensive to fix, reason why the HB would be wobbling so much, can anyone enlighten me to any or am I going to have to rip the f*cking engine out and spend more money fixing the heap of shit

Edited December 3, 2009 by AndrewJZX100

[MrStabby]

Has the outer ring separated from the inner ring (wobble will be radial only)? I'm no expert but you'd probably be able to see this if you looked at the balancer end on and see any cracks/rips in the rubber. Try a small mirror.

If thats the problem then you just need to replace the balancer.

[Duncan]

yeah maybe you'll be lucky - but its far more likely the crank is stuffed, and the longer you run the motor the sooner you will spin a main bearing and do some real damage